关于DataBind和页面代码执行顺序

    这是我在网上的第一篇技术文档。很可能这种内容已经被不少人研究过，显得过于简单了，不过当时却花了我整整一个下午，所以还是记录一下吧。

    先从两个极其简单的问题开始。

    问题一：如果页面上有一个server端控件，比如说Button btnNew，页面后台代码有响应这个Button事件的方法btnNew_Click

    那么，当用户点击这个Button时，页面后台代码的执行顺序是什么样的呢？

    答案是：首先执行Page_Load方法，然后执行btnNew_Click方法

    问题二：如果这个页面上还有其它server控件，比如说CheckBox或者DropDownList,btnNew_Click方法需要从这些控件中获取用户输入的数据进行处理，而此时Page_Load方法是空的，请问：btnNew_Click方法能够争取获取控件上的数据吗？

    答案是：可以。只要把控件的AutoPostBack属性值设为false就行了，否则在进入Page_Load方法时控件值会被刷新成默认值。

    两个很无聊的问题对吧？这是本文后面所要讲述的问题的基础。

    那么再看一个问题：

    如果CheckBox与DropDownList这样的server端控件被绑定在一个DataGrid的每一行，如下图，虚线框中是一个DataGrid，每一行都绑定了两个这样的控件。

    DataGrid的HTML代码如下：

 

<asp:datagrid id="dgrdEmpInbox" runat="server" CssClass="datagridStyle" Width="100%" Visible="False"  PagerStyle-CssClass="" OnPageIndexChanged="dgrdEmpInbox_Page" AllowPaging="True" AutoGenerateColumns="False">
             <AlternatingItemStyle CssClass="listtableGREYSTRIP"></AlternatingItemStyle>
             <ItemStyle CssClass="bodyText"></ItemStyle>
              <HeaderStyle Height="30px" CssClass="listtableHEADLINE"></HeaderStyle>
              <Columns>
                         <asp:TemplateColumn HeaderText="Select">
                                       <HeaderStyle Width="5%"></HeaderStyle>
                                        <ItemTemplate>
                                                    <asp:CheckBox id="chkSelect" Runat="server" AutoPostBack="false"></asp:CheckBox>
                                         </ItemTemplate>
                         </asp:TemplateColumn>
                         <asp:HyperLinkColumn Target="_blank" DataNavigateUrlField="IntAspirationId" DataNavigateUrlFormatString="../Employee/AppraiseeView.aspx?intAspSeqNo={0}" DataTextField="StrAspirationContent" HeaderText="Aspiration">
                                  <HeaderStyle Width="40%"></HeaderStyle>
                                  <ItemStyle CssClass="hyperlink"></ItemStyle>
                           </asp:HyperLinkColumn>
                           <asp:BoundColumn DataField="StrDateOfCreation" HeaderText="Date Raised">
                                            <HeaderStyle Width="10%"></HeaderStyle>
                            </asp:BoundColumn>
                            <asp:BoundColumn DataField="IntStatusId" HeaderText="Status">
                                             <HeaderStyle Width="15%"></HeaderStyle>
                            </asp:BoundColumn>
                             <asp:BoundColumn DataField="StrMgrId" HeaderText="Currently With">
                                              <HeaderStyle Width="10%"></HeaderStyle>
                              </asp:BoundColumn>
                              <asp:TemplateColumn HeaderText="Action">
                                               <HeaderStyle Width="5%"></HeaderStyle>
                                               <ItemTemplate>
                                                            <asp:DropDownList id="cmbAction" CssClass="DropDownListStyle" Runat="server" AutoPostBack="False"></asp:DropDownList>
                                               </ItemTemplate>
                               </asp:TemplateColumn>
                                <asp:BoundColumn DataField="StrLastActed" HeaderText="Last Acted">
                                                <HeaderStyle Width="10%"></HeaderStyle>
                                </asp:BoundColumn>
                                <asp:BoundColumn Visible="False" DataField="IntAspirationId"></asp:BoundColumn>
               </Columns>
               <PagerStyle Position="TopAndBottom" Mode="NumericPages"></PagerStyle>
</asp:datagrid>

    而Page_Load方法的代码如下：

 

void Page_Load(object sender, EventArgs e)
{
          //调用逻辑结构层，返回集合
          AspirationFcd objAspFcd = new AspirationFcd();
          aspDataSource = objAspFcd.GetEmpAspirationListFcd();
                
          //集合中有元素时将集合绑定至DataGrid
          if(aspDataSource.Count > 0)
       {
                pnlDatagrid.Visible = true;
                pnlError.Visible = false;
                dgrdEmpInbox.Visible = true;
                dgrdEmpInbox.DataSource = aspDataSource;
                dgrdEmpInbox.DataBind();
          }
          else
       {
                pnlDatagrid.Visible = false;
                pnlError.Visible = true;
                btnEdit.Enabled = false;
           }

}

    问题：现在btnNew_Click方法还能够获取控件值吗？

    答案：不能。因为Button点击后，后台代码必然首先执行Page_Load方法，而由于Page_Load方法中有DataGrid绑定代码，控件也被重新绑定为默认值

    解决方法如下：只需用if(!IsPostBack)将代码括起即可

void Page_Load(object sender, EventArgs e)
{
         if(!IsPostBack)
     {

                //调用逻辑结构层，返回集合

                AspirationFcd objAspFcd = new AspirationFcd();
                aspDataSource = objAspFcd.GetEmpAspirationListFcd();
                

                 //集合中有元素时将集合绑定至DataGrid
                if(aspDataSource.Count > 0)
            {
                      pnlDatagrid.Visible = true;
                      pnlError.Visible = false;
                      dgrdEmpInbox.Visible = true;
                      dgrdEmpInbox.DataSource = aspDataSource;
                      dgrdEmpInbox.DataBind();
                }
                else
            {
                      pnlDatagrid.Visible = false;
                      pnlError.Visible = true;
                      btnEdit.Enabled = false;
                }

          }
}

    因为btnNew的点击事件属于PostBack,它总会跳过if(!IsPostBack)代码块，因此可以避免DataGrid的重新绑定造成的控件值丢失。

    这两个问题仍然显得很没技术含量，因为太常见了。但是，下面开始麻烦了：

    仔细看DataGrid的HTML代码和上面那幅页面外观图上的页码，可知DataGrid设置了分页（10条记录一页），而且DataGrid里面还绑定了一个OnPageIndexChanged="dgrdEmpInbox_Page"，用来响应翻页事件。

    然而，翻页事件OnPageIndexChanged与Button点击事件一样，进入后台后会跳过if(!IsPostBack)这个代码块，但是翻页事件又必须依赖于DataGrid的绑定，即为了正确实现翻页，这一段代码

        dgrdEmpInbox.DataSource = aspDataSource;
        dgrdEmpInbox.DataBind();

必须放在if(!IsPostBack)之外，否则无论怎样翻页，DataGrid永远会停留在第一页，并且有时候还会出现DataGrid中的记录莫名其妙的丢失的现象，还有时候会产生其它异常的翻页现象，总之就是无法正确进入指定页。大家可以试试看。

    但是把DataGrid的绑定代码放在if(!IsPostBack)之外，又会产生btnNew_Click总是无法取得控件值的问题。

    那么，怎么解决呢？

    说到这里，我想应该说明一下这个项目的一些情况了。这是一个rework项目，虽然初次开发我也参与了，但是当时并不负责这个页面，而由于设计文档的审核没能通过，因此这个项目被退回并要求rework，此时这个页面因原开发者已经离开项目组，而分配给了我。

     原开发者的实现方式是在Button点击事件产生后，在Page_Load方法中捕捉到控件值并存入页面的ViewState对象中（其它一些页面也使用过存入HttpContext.Current.Session中的方法），执行代码进入btnNew_Click方法后，再从ViewState中取出控件值，并进行验证，最后调用逻辑层的方法进行业务处理。

     但项目被退回rework后一个重要的指标是设法提高性能，而新来的PM认为将验证放在后台代码对性能有影响，因此要求所有验证移至客户端（javascript）。如此一来，使用ViewState或context来存储控件值的方法就不可行了

 （太晚了，明天再写吧）

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using InfyIS.CCM.Business.Entity;
using InfyIS.CCM.Business.Framework;
using ISCCMBizLogic.Framework;
using ISCCMBizLogic.Security;

namespace ISCCMWebApp.Employee
...{
    /**//// <summary>
    /// Summary description for AppraiseeMain.
    /// </summary>
    public class AppraiseeMain : Page
    ...{
        protected Button btnAddNew;
        protected Button btnEdit;
        protected Button btnDelete;
        protected Button btnSave;
        protected Label lblDelete;
        protected Label lblError;
        protected Panel pnlError;
        protected Panel pnlDatagrid;
        protected LinkButton lnkbtnHomeLink;
        protected LinkButton hyplHomeLink;
        protected DataGrid dgEmpInbox;
        protected DataGrid dgrdEmpInbox;
        protected string strMaxNo;
        protected AspirationCollection aspDataSource;
        /**//********************************************************************************
         * Purpose: Load/reload Aspirations of an employee.
         * Parameters: 1)object sender,EventArgs e 
         * Returned Value: void
         * Calls: 
         * Programmer's Notes: 
         * 
         * ******************************************************************************/
        private void Page_Load(object sender, EventArgs e)
        ...{
            InfyIS.CCM.Business.Entity.Employee empMy= (InfyIS.CCM.Business.Entity.Employee)HttpContext.Current.Session["MyAccount"];

            Security objSecur = new Security();
            if(false == objSecur.IsAuthorized("EmpAspInbox",empMy.StrMailId))
            ...{
                Session.Add("ErrorMsg",ExceptionHandler.SoleInstance.GetMessage(2));
                Response.Redirect("../CCMHome.aspx");
            }

            this.btnDelete.Attributes.Add("OnClick","javascript:return ClickbtnDelete();");
            this.btnSave.Attributes.Add("OnClick","javascript:return ClickbtnSave();");
            this.btnEdit.Attributes.Add("OnClick","javascript:return ClickbtnEdit();");
            this.btnAddNew.Attributes.Add("OnClick","javascript:return ClickbtnAdd();");
            
            AspirationFcd objAspFcd = new AspirationFcd();
            objAspFcd.SetCurrentUserDetails(empMy);

            empMy.QueryQuota();
    
            strMaxNo = empMy.Max_open_number.ToString();

            if(!IsPostBack)
            ...{
                aspDataSource = objAspFcd.GetEmpAspirationListFcd();
                
                PageReload();
            }
        
        }

        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        ...{
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        ...{    
            this.lnkbtnHomeLink.Click += new EventHandler(this.hyplHomeLink_Click);
            this.dgrdEmpInbox.PageIndexChanged += new DataGridPageChangedEventHandler(this.dgrdEmpInbox_Page);
            this.dgrdEmpInbox.ItemDataBound += new DataGridItemEventHandler(this.dgrdEmpInbox_ItemDataBound);
            this.btnAddNew.Click += new EventHandler(this.btnAddNew_Click);
            this.btnSave.Click += new EventHandler(this.btnSave_Click);
            this.btnEdit.Click += new EventHandler(this.btnEdit_Click);
            this.btnDelete.Click += new EventHandler(this.btnDelete_Click);
            this.Load += new EventHandler(this.Page_Load);

        }
        #endregion

        events#region events
        private void btnAddNew_Click(object sender, EventArgs e)
        ...{
        }

        /**//********************************************************************************
         * Purpose: initiate delete operations when delete button is being clicked
         * Parameters: 1)object sender,EventArgs e 
         * Returned Value: void
         * Calls: 
         * Programmer's Notes: 
         * 
         * ******************************************************************************/
        private void btnDelete_Click(object sender, EventArgs e)
        ...{
            InfyIS.CCM.Business.Entity.Employee empMy = (InfyIS.CCM.Business.Entity.Employee)HttpContext.Current.Session["MyAccount"];
            AspirationFcd objAspFcd = new AspirationFcd();
            objAspFcd.SetCurrentUserDetails(empMy);
            int intCount = 0;
            foreach(DataGridItem objItem in dgrdEmpInbox.Items)
            ...{
                CheckBox chkSelect = (CheckBox) objItem.FindControl("chkSelect");
                if(chkSelect.Enabled)
                ...{
                    int intNumber = Convert.ToInt32(objItem.Cells[7].Text.ToString());
                    if(chkSelect.Checked)
                    ...{
                        
                        try
                        ...{
                            objAspFcd.DeleteEmpAspirationFcd(intNumber);
                            intCount++;
                        }
                        catch(Exception ex)
                        ...{
                            this.pnlError.Visible = true;
                            this.lblError.Text = ex.Message.Trim();
                        }
                    }
                }
            }
            if(intCount>0)
            ...{
                Page.RegisterStartupScript("","<script language=javascript>window.navigate('../Employee/AppraiseeMain_New.aspx');window.alert('Operation Successful!');</script>");
                return;
            }
        }

        /**//********************************************************************************
         * Purpose: initiate edit operations when edit button is being clicked
         * Parameters: 1)object sender,EventArgs e 
         * Returned Value: void
         * Calls: 
         * Programmer's Notes: 
         * 
         * ******************************************************************************/
        private void btnEdit_Click(object sender, EventArgs e)
        ...{
//            int []  arrAspId = new int[2];
            string strQuerySeqNo="";
            int intCount = 0;
            foreach (DataGridItem objItem in dgrdEmpInbox.Items)
            ...{
                CheckBox chkSelect = (CheckBox) objItem.FindControl("chkSelect");
                if(chkSelect.Enabled)
                    if(chkSelect.Checked)
                    ...{
                        int iNumber = Convert.ToInt32(objItem.Cells[7].Text.ToString());
                        AspirationFcd aspFcd = new AspirationFcd();
                        InfyIS.CCM.Business.Entity.Employee emp = (InfyIS.CCM.Business.Entity.Employee)Session["MyAccount"];
                        aspFcd.SetCurrentUserDetails(emp);

//                        Aspiration aspToEdit = emp.AspirationCollection.Item(iNumber);
                        Aspiration aspToEdit = aspFcd.GetEmpAspirationBySeqNoFcd(iNumber);
                        if(aspToEdit.IntStatusId != 1)
                        ...{
                            string strErrorMsg = ExceptionHandler.SoleInstance.GetMessage(216);
                            Page.RegisterStartupScript("","<script>window.alert('"+ strErrorMsg +"');" + 
                                        "window.navigate('../Employee/AppraiseeMain_New.aspx');</script>");
                            return;
                        }
                        
                        strQuerySeqNo = strQuerySeqNo + iNumber.ToString() + "-";
                        intCount++;
                    }
            }
            if(intCount < 1)
            ...{
                string strMsg = ExceptionHandler.SoleInstance.GetMessage(201);
                Page.RegisterStartupScript("","<script>window.alert('"+strMsg+"');</script>");
                return;
            }
            
//            Session.Add("intAspSeqNo", arrAspId);
            
//            string strShowOpen = "<script language='javascript'>" + 
//                        "window.open('../Employee/AppraiseeAspiration.aspx?Query=emp_asp_edit&Seq="+ strQuerySeqNo +"',''," + 
//                        "'height=400,width=780, left=80,top=200,channelmode=0,dependent=0,directories=0,fullscreen=0," + 
//                        "location=0,menubar=0,resizable=0,scrollbars=1,status=0,toolbar=0');</script>";   
//            if(!IsClientScriptBlockRegistered("clientScript"))   
//                RegisterClientScriptBlock("clientScript",strShowOpen); 
            Page.RegisterStartupScript("","<script language='javascript'>window.navigate('../Employee/AppraiseeMain_New.aspx');"+
                        "window.open('../Employee/AppraiseeAspiration.aspx?Query=emp_asp_edit&Seq="+ strQuerySeqNo +"',''," + 
                        "'height=400,width=780, left=80,top=200,channelmode=0,dependent=0,directories=0,fullscreen=0," + 
                        "location=0,menubar=0,resizable=0,scrollbars=1,status=0,toolbar=0')</script>");
        
        }

        /**//********************************************************************************
        * Purpose: initiate save operations when save button is being clicked
        * Parameters: 1)object sender,EventArgs e 
        * Returned Value: void
        * Calls: 
        * Programmer's Notes: 
        * 
        * ******************************************************************************/
        private void btnSave_Click(object sender, EventArgs e)
        ...{
            //Check which row to save
            int [] arrAspId = new int[2];
            int[] arrAction = new int[2];
            int[] arrStatusIds = new int[2];
            int intCount = 0;
            foreach (DataGridItem objItem in dgrdEmpInbox.Items)
            ...{
                CheckBox chkSelect = (CheckBox) objItem.Cells[0].FindControl("chkSelect");
                DropDownList cmbAction = (DropDownList)objItem.Cells[5].FindControl("cmbAction");

                if(chkSelect.Enabled && chkSelect.Checked)
                    if(cmbAction.Enabled)
                    ...{
                        int intAspSeqNo = Convert.ToInt32(objItem.Cells[7].Text.ToString());
                        string strStatus = objItem.Cells[3].Text;
                        if(strStatus.Equals("With Employee for Review"))
                            arrStatusIds[intCount] = 3;
                        else if(strStatus.Equals("With Employee for Sign-Off"))
                            arrStatusIds[intCount] = 5;
                        arrAspId[intCount] = intAspSeqNo;
                        int key = Convert.ToInt32(cmbAction.SelectedItem.Value);
                        if(key != -1)
                        ...{
                            arrAction[intCount] = key;
                            intCount++;
                        }
                        else
                        ...{
                            string strMsg = ExceptionHandler.SoleInstance.GetMessage(208);
                            Page.RegisterStartupScript("","<script>window.alert('"+strMsg+"');window.navigate('../Employee/AppraiseeMain_New.aspx')</script>");
                            return;
                        }
                    }
            }
            AspirationFcd aspFcd = new AspirationFcd();
            InfyIS.CCM.Business.Entity.Employee empMy = (InfyIS.CCM.Business.Entity.Employee)HttpContext.Current.Session["MyAccount"];
            aspFcd.SetCurrentUserDetails(empMy);
            int intResult = intCount;
            for(int intLoop=0;intLoop<intCount;intLoop++)
            ...{
                int[] arrPassAspId = new int[2];
                arrPassAspId[0] = arrAspId[intLoop];
                arrPassAspId[1] = arrAspId[intLoop];
                EnumState enumStateToBe = new EnumState();
                
                if(arrAction[intLoop]==0)
                    enumStateToBe = EnumState.WithMgrSignOffState;
                else if(arrAction[intLoop]==1)
                    enumStateToBe = EnumState.AbandonedState;
                else
                    enumStateToBe = EnumState.SignedOffState;
                string strResult = aspFcd.UpdateAspStatusFcd(arrPassAspId,(EnumState)arrStatusIds[intLoop],enumStateToBe);
                
                InbayFcd objInbayFcd = new InbayFcd();
                objInbayFcd.AddInbayEmailRecordFcd(empMy.StrMailId,empMy.StrEmpNo,empMy.StrMgrNo,(EnumState)arrStatusIds[intLoop],enumStateToBe,arrPassAspId[0]);
                if(!strResult.Equals("Operation successful"))
                    intResult--;
            }
            if(intResult==intCount)
            ...{
                Page.RegisterStartupScript("","<script language='javascript'>window.alert('Operation Successful!');window.navigate('../Employee/AppraiseeMain_New.aspx');</script>");
            }
            else
            ...{
                string strFail = (intCount-intResult).ToString();
                Page.RegisterStartupScript("","<script language='javascript'>window.alert('"+strFail+" operation failed as the current status is modified by Manager.');window.navigate('../Employee/AppraiseeMain_New.aspx');</script>");
            }
//            Session.Add("intAspSeqNo",arrAspId);
//            Session.Add("enumAction",arrAction);
//            Session.Add("statusIds",arrStatusIds);
//            if(arrStatusIds[0] != (int)EnumState.WithEmpSignOffState && arrStatusIds[1] != (int)EnumState.WithEmpSignOffState)
//            {
//                Response.Redirect("../Employee/emp_inbox.aspx?Category=Counselling&Command=emp_inbox_save");
//            }
//            string strShowOpen = "<script language='javascript'>" + 
//                        "window.open('../Employee/emp_comments.aspx?Category=counselling&Command=emp_cmt',''," + 
//                        "'height=400,width=780, left=80,top=200,channelmode=0,dependent=0,directories=0,fullscreen=0," + 
//                        "location=0,menubar=0,resizable=0,scrollbars=1,status=0,toolbar=0');</script>";   
//            if(!IsClientScriptBlockRegistered("clientScript"))   
//                RegisterClientScriptBlock("clientScript",strShowOpen);
            
        }

        /**//********************************************************************************
         * Purpose: initiate column value row by row when databinding to Aspiration 
         *            collection
         * Parameters: 1)object sender,EventArgs e 
         * Returned Value: void
         * Calls: StateValue(),IsActable(),IsSelectable(),LastAction(),
         *            GetAllActionsByState()
         * Programmer's Notes: 
         * 
         * ******************************************************************************/
        private void dgrdEmpInbox_ItemDataBound(object sender, DataGridItemEventArgs e)
        ...{

            if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            ...{
                int intStatusId = Convert.ToInt32(e.Item.Cells[3].Text);
                CheckBox chkSelect = (CheckBox)e.Item.Cells[0].FindControl("chkSelect");
                DropDownList cmbAction = (DropDownList)e.Item.Cells[5].FindControl("cmbAction");

                chkSelect.Attributes.Add("onclick","javascript:return ClickchkSelect('"+chkSelect.ClientID+"','"+cmbAction.ClientID+"');");
                
//                e.Item.Cells[3].Text = StateFactory.StateValue(intStatusId);
//                cmbAction.Enabled = StateFactory.IsActable(intStatusId,EnumRole.Employee);
//                chkSelect.Enabled = StateFactory.IsSelectable(intStatusId,EnumRole.Employee);

                switch(intStatusId)
                ...{
                    case 1:    //StateNew
                        chkSelect.Enabled = true;
                        cmbAction.Items.Clear();
                        cmbAction.Items.Add(new ListItem("n/a"));
                        cmbAction.Enabled = false;
                        e.Item.Cells[3].Text = "New";
                        break;
                    case 2:    //With Manager for discussion
                    case 8:
                        chkSelect.Enabled = false;
                        cmbAction.Items.Clear();
                        cmbAction.Items.Add(new ListItem("n/a"));
                        cmbAction.Enabled = false;
                        e.Item.Cells[3].Text = "With Manager for Discussion";
                        break;
                    case 3:    //With Employee for Review
                        chkSelect.Enabled = true;
                        cmbAction.Enabled = true;
                        cmbAction.Items.Clear();
                        cmbAction.Items.Add(new ListItem("--Select--","-1"));
                        cmbAction.Items.Add(new ListItem("Agree To Plan","0"));
                        cmbAction.Items.Add(new ListItem("Abandon","1"));
                        cmbAction.Items.Add(new ListItem("Sign-Off","2"));
                        e.Item.Cells[3].Text = "With Employee for Review";
                        break;
                    case 4:    //With Manager For Sign-Off
                        chkSelect.Enabled = false;
                        cmbAction.Items.Clear();
                        cmbAction.Items.Add(new ListItem("Agree To Plan"));
                        cmbAction.Enabled = false;
                        e.Item.Cells[3].Text = "With Manager for Sign-Off";
                        break;
                    case 5:    //With Employee For Sign-off
                        chkSelect.Enabled = true;
                        cmbAction.Enabled = true;
                        cmbAction.Items.Clear();
                        cmbAction.Items.Add(new ListItem("--Select--","-1"));
                        cmbAction.Items.Add(new ListItem("Sign-Off","2"));
                        e.Item.Cells[3].Text = "With Employee for Sign-Off";
                        break;
                    case 6:    //Signed-Off
                        chkSelect.Enabled = false;
                        cmbAction.Items.Clear();
                        cmbAction.Items.Add(new ListItem("SignOff"));
                        cmbAction.Enabled = false;
                        e.Item.Cells[3].Text = "SignedOff";
                        break;
                    case 7:
                        chkSelect.Enabled = false;
                        cmbAction.Items.Clear();
                        cmbAction.Items.Add(new ListItem("Abandon"));
                        cmbAction.Enabled = false;
                        e.Item.Cells[3].Text = "Abandoned";
                        break;

                }
                
            }
        }
        #endregion

        
        ClientMethods#region ClientMethods
        /**//********************************************************************************
         * Purpose: Count the number of Aspirations being operated on at one time
         * Parameters: 1)object sender,EventArgs e 
         * Returned Value: void
         * Calls: 
         * Programmer's Notes: 
         * 
         * ******************************************************************************/
//        public void chk_CheckedChanged(object sender, System.EventArgs e)
//        {
//            int intSelectedNum = 0;
//
//            foreach (DataGridItem objItem in dgrdEmpInbox.Items)
//            {
//                CheckBox chkSelect = (CheckBox) objItem.Cells[0].FindControl("chkSelect");
//                
//                if(chkSelect.Checked)
//                {
//                    int intAspSeqNo = Convert.ToInt32(objItem.Cells[7].Text.ToString());
//                    
//                    InfyIS.CCM.Business.Entity.Employee emp = (InfyIS.CCM.Business.Entity.Employee)HttpContext.Current.Session["MyAccount"];
//                    AspirationCollection aspCol = emp.AspirationCollection;
//                    Aspiration aspSelected = aspCol.Item(intAspSeqNo);
//                    if(aspSelected == null)
//                    {
//                        string strErrorMsg = ExceptionHandler.SoleInstance.GetMessage(215);
//                        Page.RegisterStartupScript("","<script>window.alert('"+ strErrorMsg +"');" + 
//                                    "window.navigate('../Employee/emp_inbox.aspx?Category=counselling&Command=emp_inbox');</script>");
//                        return;
//                    }
//                    if(aspSelected.IntStatusId > (int)EnumState.NewState)
//                    {
//                        btnSave.Enabled = true;
//                        btnDelete.Enabled = false;
//                        btnEdit.Enabled = false;
//                    }
//                    else
//                    {
//                        btnSave.Enabled = false;
//                        btnDelete.Enabled = true;
//                        btnEdit.Enabled = true;
//                    }
//                    intSelectedNum++;
//                }
//                
//            }
//            if(intSelectedNum == 0)
//            {
//                btnSave.Enabled = false;
//                btnDelete.Enabled = false;
//                btnEdit.Enabled = false;
//            }
//                
//        }
        #endregion

        /**//********************************************************************************
         * Purpose: Redirect to User's home page when CCM home link is clicked.
         * Parameters: 1)object sender,EventArgs e 
         * Returned Value: void
         * Calls:
         * Programmer's Notes: 
         * 
         * ******************************************************************************/
        private void hyplHomeLink_Click(object sender, EventArgs e)
        ...{
            InfyIS.CCM.Business.Entity.Employee employee = (InfyIS.CCM.Business.Entity.Employee)HttpContext.Current.Session["MyAccount"];
                if(employee != null)
                    Response.Redirect(employee.AccessTable.StrDefaultPage);
                else
                ...{
                    Session.Add("ErrorMsg",ExceptionHandler.SoleInstance.GetMessage(5));
                    Response.Redirect("../CCMHome.aspx");
                }
        }

        protected void dgrdEmpInbox_Page(object source, DataGridPageChangedEventArgs e)
        ...{
            InfyIS.CCM.Business.Entity.Employee empMy = (InfyIS.CCM.Business.Entity.Employee)HttpContext.Current.Session["MyAccount"];
            AspirationFcd objAspFcd = new AspirationFcd();
            objAspFcd.SetCurrentUserDetails(empMy);
            aspDataSource = objAspFcd.GetEmpAspirationListFcd();
            PageReload();
            dgrdEmpInbox.CurrentPageIndex = e.NewPageIndex;
            if(this.aspDataSource != null)
            ...{
//                AspirationCollection dataSource = (AspirationCollection)Session["AspirationCollectionForPaging"];
                
                if(aspDataSource.Count > 0)
                ...{
                    pnlDatagrid.Visible = true;
                    pnlError.Visible = false;
                    dgrdEmpInbox.Visible = true;
                    dgrdEmpInbox.DataSource = aspDataSource;
                    dgrdEmpInbox.DataBind();
                    
                }
                else
                ...{
                    pnlDatagrid.Visible = false;
                    pnlError.Visible = true;
                    btnEdit.Enabled = false;
                        
                }
            }
        }

        private void PageReload()
        ...{
            if(aspDataSource.Count > 0)
            ...{
                pnlDatagrid.Visible = true;
                pnlError.Visible = false;
                dgrdEmpInbox.Visible = true;
                dgrdEmpInbox.DataSource = aspDataSource;
                dgrdEmpInbox.DataBind();
                
            }
            else
            ...{
                pnlDatagrid.Visible = false;
                pnlError.Visible = true;
                btnEdit.Enabled = false;
                
            }
        }
    }
}

 

 

<%...@ Register TagPrefix="CCM" TagName="Header" Src="../UserControls/EmpHeader.ascx" %>
<%...@ Register TagPrefix="CCM" TagName="Footer" Src="../UserControls/Footer.ascx" %>
<%...@ Page language="c#" Codebehind="AppraiseeMain_New.aspx.cs" AutoEventWireup="false" Inherits="ISCCMWebApp.Employee.AppraiseeMain" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>Employee Inbox</title>
        <script language="JavaScript">...       
window.history.forward(1);
        </script>
        <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
        <meta content="C#" name="CODE_LANGUAGE">
        <meta content="JavaScript" name="vs_defaultClientScript">
        <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
        <LINK href="../stylesheet/Style.css" type="text/css" rel="stylesheet">
        <LINK href="../stylesheet/ISstyle.css" type="text/css" rel="stylesheet">
        <script language="javascript">...
                        
            function ClickchkSelect(strChk,strCmb)
            ...{
                if(document.getElementById(strCmb).disabled==true&&document.getElementById(strChk).checked==true)
                ...{
                    var del = parseInt(document.getElementById('DelFlag').value)+1;
                    document.getElementById('DelFlag').value = del.toString();
                }
                if(document.getElementById(strCmb).disabled!=true&&document.getElementById(strChk).checked==true)
                ...{
                    var ndel = parseInt(document.getElementById('NotDelFlag').value)+1;
                    document.getElementById('NotDelFlag').value = ndel.toString();
                }
                if(document.getElementById(strCmb).disabled==true&&document.getElementById(strChk).checked==false)
                ...{
                    var del = parseInt(document.getElementById('DelFlag').value)-1;
                    document.getElementById('DelFlag').value = del.toString();
                }
                if(document.getElementById(strCmb).disabled!=true&&document.getElementById(strChk).checked==false)
                ...{
                    var ndel = parseInt(document.getElementById('NotDelFlag').value)-1;
                    document.getElementById('NotDelFlag').value = ndel.toString();
                }
            }
            
            function ClickbtnDelete()
            ...{
                var countNotDel = parseInt(document.getElementById('NotDelFlag').value);
                var countDel = parseInt(document.getElementById('DelFlag').value);
                if(countNotDel>0)
                ...{
                    window.alert("One or more of the aspirations you select can not be deleted.  You can only delete the ones with 'New' status!");
                    return false;
                }
                else if(countDel <= 0)
                ...{
                    
                    window.alert("Please select at least one aspiration to delete!");
                    return false;
                }
                else
                ...{
                    if(window.confirm('Do you want to delete the aspirations you selected?'))
                        return true;
                    else
                        return false;
                }
                
            }
                        
            function ClickbtnEdit()
            ...{
                var countNotDel = parseInt(document.getElementById('NotDelFlag').value);
                var countDel = parseInt(document.getElementById('DelFlag').value);
                if(countNotDel>0)
                ...{
                    window.alert("One or more of the aspirations you select can not be edited.  You can only edit the ones with 'New' status!");
                    return false;
                }
                else if(countDel <= 0)
                ...{
                    window.alert("Please select at least one aspiration to edit!");
                    return false;
                }
                else
                    return true;
            }
            
            function ClickbtnSave()
            ...{
                
                var countNotDel = parseInt(document.getElementById('NotDelFlag').value);
                var countDel = parseInt(document.getElementById('DelFlag').value);
                if(countDel>0)
                ...{
                    window.alert("One or more of the aspirations you select can not be saved.");
                    return false;
                }
                else if(countNotDel <= 0)
                ...{
                    window.alert("Please select at least one aspiration to save!");
                    return false;
                }
                else
                    return true;
            }
            
            function ClickbtnAdd()
            ...{
                maxNo = parseInt(document.getElementById("AddFlag").value);
                if(maxNo<=0)
                ...{
                    alert("You have reached the maximum number of active aspiration.");
                    return false;
                }
                else
                ...{
                    document.getElementById("AddFlag").value = maxNo.toString();
                    window.open('../Employee/AppraiseeAspiration.aspx?Query=emp_asp_new','','height=400,width=780,left=80,top=200,channelmode=0,dependent=0,directories=0,fullscreen=0,location=0,menubar=0,resizable=0,scrollbars=1,status=0,toolbar=0');
                    return false;
                }
            }
        </script>
    </HEAD>
    <body class="bodyTEXT" MS_POSITIONING="GridLayout">
        <form id="FormCCM" runat="server">
            <CCM:HEADER id="EmpHeader" runat="server"></CCM:HEADER>
            <table style="WIDTH: 976px; HEIGHT: 384px" height="384" cellSpacing="0" cellPadding="0"
                width="976" border="0">
                <tr height="5%">
                    <td>
                        <!--Header Space -->
                        <table id="header" height="100%" cellSpacing="0" cellPadding="0" width="100%" border="0">
                            <tr>
                                <td>
                                    <table cellSpacing="0" cellPadding="0">
                                        <tr>
                                            <td class="secondnavGREEN"></td>
                                            <td class="secondnavSEPERATE" align="center"><A class="secondnavLINKON" href="../Employee/AppraiseeMain_New.aspx">Aspirations</A>
                                            </td>
                                            <td><IMG class="secondnavSEPERATE" src="../images/seperator.gif" border="0">
                                            </td>
                                            <td class="secondnavSEPERATE" align="center"><A class="secondnavLINKOFF" href="../Employee/AppraiseeCareerPlan.aspx">Career 
                                                    Planning </A>
                                            </td>
                                            <td><IMG class="secondnavSEPERATE" src="../images/seperator.gif" border="0">
                                            </td>
                                            <td class="secondnavSEPERATE" align="center"><A class="secondnavLINKOFF" href="../DashBoard/PerformanceData.aspx">My 
                                                    Dashboard </A>
                                            </td>
                                        </tr>
                                    </table>
                                </td>
                            </tr>
                        </table>
                    </td>
                </tr>
                <tr>
                    <td>
                        <!--Information Space -->
                        <table id="information" height="100%" cellSpacing="0" cellPadding="0" width="100%" border="0">
                            <tr vAlign="top">
                                <!--Internal Right Space -->
                                <td style="BORDER-TOP: silver 1px dotted" align="center" width="85%">
                                    <table id="rightside" width="100%">
                                        <tr>
                                            <td>
                                                <table id="internalRightHeader" cellSpacing="0" cellPadding="0" width="100%" border="0">
                                                    <tr>
                                                        <td style="HEIGHT: 18px"><asp:linkbutton id="lnkbtnHomeLink" runat="server" CssClass="breadcrumbLINK"><FONT size="1">CCM</FONT></asp:linkbutton><FONT size="1">&gt;</FONT>
                                                            <A class="breadcrumbLINK" href="../Employee/emp_inbox.aspx?Category=counselling&amp;Command=emp_inbox">
                                                                <FONT size="1">Employee</FONT></A><FONT size="1">&gt;</FONT>&nbsp;<FONT size="1">Aspirations</FONT>
                                                        </td>
                                                        <td style="HEIGHT: 18px" align="right"><IMG src="../images/help_FineGround_0nmwhres3t3vo4dboir2qje21_FGN_V01.gif" border="0">
                                                            <IMG class="secondnavSEPERATE" src="../images/seperator.gif" border="0"> <IMG onmouseover="this.style.cursor='hand'" onclick="window.print()" src="/ISCCMWebApp/images/print.gif"
                                                                border="0">
                                                        </td>
                                                    </tr>
                                                </table>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td>
                                                <table id="internalRightBody" height="80%" width="100%" border="0">
                                                    <!--Body Space -->
                                                    <tr height="100%" width="100%">
                                                        <td><asp:panel id="pnlError" Width="100%" Runat="server">
                                                                <TABLE class="errorTable" style="WIDTH: 960px; HEIGHT: 34px" borderColor="#cc0000" width="960">
                                                                    <TR>
                                                                        <TD><IMG src="../images/error.gif" border="0">
                                                                            <asp:Label id="lblError" CssClass="tableTEXT" Runat="server" Width="920px" Visible="True">No aspirations to display</asp:Label></TD>
                                                                    </TR>
                                                                </TABLE>
                                                            </asp:panel></td>
                                                    </tr>
                                                    <tr height="100%" width="100%">
                                                        <td align="center"><asp:panel id="pnlDatagrid" Runat="server" Visible="False">
                                                                <asp:datagrid id="dgrdEmpInbox" runat="server" CssClass="datagridStyle" Width="100%" Visible="False"
                                                                    PagerStyle-CssClass="" OnPageIndexChanged="dgrdEmpInbox_Page" AllowPaging="True" AutoGenerateColumns="False">
                                                                    <AlternatingItemStyle CssClass="listtableGREYSTRIP"></AlternatingItemStyle>
                                                                    <ItemStyle CssClass="bodyText"></ItemStyle>
                                                                    <HeaderStyle Height="30px" CssClass="listtableHEADLINE"></HeaderStyle>
                                                                    <Columns>
                                                                        <asp:TemplateColumn HeaderText="Select">
                                                                            <HeaderStyle Width="5%"></HeaderStyle>
                                                                            <ItemTemplate>
                                                                                <asp:CheckBox id="chkSelect" Runat="server" AutoPostBack="false"></asp:CheckBox>
                                                                            </ItemTemplate>
                                                                        </asp:TemplateColumn>
                                                                        <asp:HyperLinkColumn Target="_blank" DataNavigateUrlField="IntAspirationId" DataNavigateUrlFormatString="../Employee/AppraiseeView.aspx?intAspSeqNo={0}"
                                                                            DataTextField="StrAspirationContent" HeaderText="Aspiration">
                                                                            <HeaderStyle Width="40%"></HeaderStyle>
                                                                            <ItemStyle CssClass="hyperlink"></ItemStyle>
                                                                        </asp:HyperLinkColumn>
                                                                        <asp:BoundColumn DataField="StrDateOfCreation" HeaderText="Date Raised">
                                                                            <HeaderStyle Width="10%"></HeaderStyle>
                                                                        </asp:BoundColumn>
                                                                        <asp:BoundColumn DataField="IntStatusId" HeaderText="Status">
                                                                            <HeaderStyle Width="15%"></HeaderStyle>
                                                                        </asp:BoundColumn>
                                                                        <asp:BoundColumn DataField="StrMgrId" HeaderText="Currently With">
                                                                            <HeaderStyle Width="10%"></HeaderStyle>
                                                                        </asp:BoundColumn>
                                                                        <asp:TemplateColumn HeaderText="Action">
                                                                            <HeaderStyle Width="5%"></HeaderStyle>
                                                                            <ItemTemplate>
                                                                                <asp:DropDownList id="cmbAction" CssClass="DropDownListStyle" Runat="server" AutoPostBack="False"></asp:DropDownList>
                                                                            </ItemTemplate>
                                                                        </asp:TemplateColumn>
                                                                        <asp:BoundColumn DataField="StrLastActed" HeaderText="Last Acted">
                                                                            <HeaderStyle Width="10%"></HeaderStyle>
                                                                        </asp:BoundColumn>
                                                                        <asp:BoundColumn Visible="False" DataField="IntAspirationId"></asp:BoundColumn>
                                                                    </Columns>
                                                                    <PagerStyle Position="TopAndBottom" Mode="NumericPages"></PagerStyle>
                                                                </asp:datagrid>
                                                            </asp:panel></td>
                                                    </tr>
                                                </table>
                                                <br>
                                                <p align="center"><asp:button id="btnAddNew" runat="server" CssClass="tableBUTTON" Text="Add New Aspiration..."></asp:button><asp:button id="btnSave" runat="server" CssClass="tableBUTTON" Text="Save"></asp:button><asp:button id="btnEdit" runat="server" CssClass="tableBUTTON" Text="Edit"></asp:button><asp:button id="btnDelete" runat="server" CssClass="tableBUTTON" Text="Delete"></asp:button></p>
                                                <input 
                  id=AddFlag type=hidden value="<%=strMaxNo%>" 
                  > <input id="NotDelFlag" type="hidden" value="0"> <input id="DelFlag" type="hidden" value="0">
                                            </td>
                                        </tr>
                                    </table>
                                </td>
                            </tr>
                        </table>
                    </td>
                </tr>
            </table>
            <CCM:FOOTER id="footer" runat="server"></CCM:FOOTER></form>
    </body>
</HTML>