extjs 上传文件 fileUpload

上传文件要是用asp.net的控件上传其实是很简单的问题，要是为了用户体验的提高很多的web开发人员都会采取很炫的ajax上传。

或是用flash想用的控件上传。今天我们看看extjs中如何很炫的上传文件或图片。

 

查了查资料发现extjs上传文件需要一个js文件FileUploadField.js，在extjs类库文件里可以找到。

FileUploadField.js代码如下：

/*! * Ext JS Library 3.2.0 * Copyright(c) 2006-2010 Ext JS, Inc. * [e-mail] * http://www.extjs.com/license */Ext.ns('Ext.ux.form');/** * @class Ext.ux.form.FileUploadField * @extends Ext.form.TextField * Creates a file upload field. * @xtype fileuploadfield */Ext.ux.form.FileUploadField = Ext.extend(Ext.form.TextField, { /** * @cfg {String} buttonText The button text to display on the upload button (defaults to * 'Browse...'). Note that if you supply a value for {@link #buttonCfg}, the buttonCfg.text * value will be used instead if available. */ buttonText: 'Browse...', /** * @cfg {Boolean} buttonOnly True to display the file upload field as a button with no visible * text field (defaults to false). If true, all inherited TextField members will still be available. */ buttonOnly: false, /** * @cfg {Number} buttonOffset The number of pixels of space reserved between the button and the text field * (defaults to 3). Note that this only applies if {@link #buttonOnly} = false. */ buttonOffset: 3, /** * @cfg {Object} buttonCfg A standard {@link Ext.Button} config object. */ // private readOnly: true, /** * @hide * @method autoSize */ autoSize: Ext.emptyFn, // private initComponent: function(){ Ext.ux.form.FileUploadField.superclass.initComponent.call(this); this.addEvents( /** * @event fileselected * Fires when the underlying file input field's value has changed from the user * selecting a new file from the system file selection dialog. * @param {Ext.ux.form.FileUploadField} this * @param {String} value The file value returned by the underlying file input field */ 'fileselected' ); }, // private onRender : function(ct, position){ Ext.ux.form.FileUploadField.superclass.onRender.call(this, ct, position); this.wrap = this.el.wrap({cls:'x-form-field-wrap x-form-file-wrap'}); this.el.addClass('x-form-file-text'); this.el.dom.removeAttribute('name'); this.createFileInput(); var btnCfg = Ext.applyIf(this.buttonCfg || {}, { text: this.buttonText }); this.button = new Ext.Button(Ext.apply(btnCfg, { renderTo: this.wrap, cls: 'x-form-file-btn' + (btnCfg.iconCls ? ' x-btn-icon' : '') })); if(this.buttonOnly){ this.el.hide(); this.wrap.setWidth(this.button.getEl().getWidth()); } this.bindListeners(); this.resizeEl = this.positionEl = this.wrap; }, bindListeners: function(){ this.fileInput.on({ scope: this, mouseenter: function() { this.button.addClass(['x-btn-over','x-btn-focus']) }, mouseleave: function(){ this.button.removeClass(['x-btn-over','x-btn-focus','x-btn-click']) }, mousedown: function(){ this.button.addClass('x-btn-click') }, mouseup: function(){ this.button.removeClass(['x-btn-over','x-btn-focus','x-btn-click']) }, change: function(){ var v = this.fileInput.dom.value; this.setValue(v); this.fireEvent('fileselected', this, v); } }); }, createFileInput : function() { this.fileInput = this.wrap.createChild({ id: this.getFileInputId(), name: this.name||this.getId(), cls: 'x-form-file', tag: 'input', type: 'file', size: 1 }); }, reset : function(){ this.fileInput.remove(); this.createFileInput(); this.bindListeners(); Ext.ux.form.FileUploadField.superclass.reset.call(this); }, // private getFileInputId: function(){ return this.id + '-file'; }, // private onResize : function(w, h){ Ext.ux.form.FileUploadField.superclass.onResize.call(this, w, h); this.wrap.setWidth(w); if(!this.buttonOnly){ var w = this.wrap.getWidth() - this.button.getEl().getWidth() - this.buttonOffset; this.el.setWidth(w); } }, // private onDestroy: function(){ Ext.ux.form.FileUploadField.superclass.onDestroy.call(this); Ext.destroy(this.fileInput, this.button, this.wrap); }, onDisable: function(){ Ext.ux.form.FileUploadField.superclass.onDisable.call(this); this.doDisable(true); }, onEnable: function(){ Ext.ux.form.FileUploadField.superclass.onEnable.call(this); this.doDisable(false); }, // private doDisable: function(disabled){ this.fileInput.dom.disabled = disabled; this.button.setDisabled(disabled); }, // private preFocus : Ext.emptyFn, // private alignErrorIcon : function(){ this.errorIcon.alignTo(this.wrap, 'tl-tr', [2, 0]); }});Ext.reg('fileuploadfield', Ext.ux.form.FileUploadField);// backwards compatExt.form.FileUploadField = Ext.ux.form.FileUploadField;

 

fileupload.html,显示上传的效果代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head> <title></title> <link rel="stylesheet" type="text/css" href="ext/resources/css/ext-all.css" mce_href="ext/resources/css/ext-all.css" /> <script type="text/javascript" src="ext/adapter/ext/ext-base.js" mce_src="ext/adapter/ext/ext-base.js"></script> <script src="ext/ext-all-debug.js" mce_src="ext/ext-all-debug.js" type="text/javascript"></script> <script src="js/FileUploadField.js" mce_src="js/FileUploadField.js" type="text/javascript"></script> <style type=text/css> .upload-icon { background: url('images/image_add.png') no-repeat 0 0 !important; } .x-form-file-wrap { position: relative; height: 22px; } .x-form-file-wrap .x-form-file { position: absolute; right: 0; -moz-opacity: 0; filter:alpha(opacity: 0); opacity: 0; z-index: 2; height: 22px; } .x-form-file-wrap .x-form-file-btn { position: absolute; right: 0; z-index: 1; } .x-form-file-wrap .x-form-file-text { position: absolute; left: 0; z-index: 3; color: #777; } </style> <script type="text/javascript"><!-- Ext.onReady(function() { Ext.QuickTips.init(); var msg = function(title, msg) { Ext.Msg.show({ title: title, msg: msg, minWidth: 200, modal: true, icon: Ext.Msg.INFO, buttons: Ext.Msg.OK }); }; var fp = new Ext.FormPanel({ renderTo: 'fi-form', fileUpload: true, width: 500, frame: true, title: '图片上传操作', autoHeight: true, bodyStyle: 'padding: 10px 10px 0 10px;', labelWidth: 50, defaults: { anchor: '95%', allowBlank: false, msgTarget: 'side' }, items: [{ xtype: 'textfield', fieldLabel: 'Name', name:"txtname" }, { xtype: 'fileuploadfield', id: 'form-file', emptyText: 'Select an image', fieldLabel: 'Photo', name: 'photo-path', buttonText: '', buttonCfg: { iconCls: 'upload-icon' }}], buttons: [{ text: 'Save', handler: function() { if (fp.getForm().isValid()) { fp.getForm().submit({ url: 'Default.aspx',//后台处理的页面 waitMsg: 'Uploading your photo...', success: function(fp, o) { msg('Success', 'Processed file "' + o.result.files + '" on the server'); } }); } } }, { text: 'Reset', handler: function() { fp.getForm().reset(); }}] }); }); // --></script></head><body><div id="fi-form"></div></body></html>

以上的代码都是显示上传的内容，而上传的关键在于后台是如何操作。

 

 可以新建一个Default.aspx页面来进行上传的处理。在上传的提交时都是post进行提交的，所以关键是在后台要获取上传的对象。

在Page_Load中加入代码：

string newname = Request["txtname"]; //获取重命名HttpPostedFile postedFile = Request.Files["photo-path"];//获取上传信息对象string filename = postedFile.FileName;//获取上传的文件路径string tempPath = System.Configuration.ConfigurationManager.AppSettings["NewsFolderPath"];//获取保存文件夹路径，我是设置在webconfig中了。string savepath = Server.MapPath(tempPath);//获取保存路径 string sExtension = filename.Substring(filename.LastIndexOf('.'));//获取拓展名 if (!Directory.Exists(savepath)) Directory.CreateDirectory(savepath); string sNewFileName = DateTime.Now.ToString("yyyyMMddhhmmsfff"); postedFile.SaveAs(savepath + @"/" + sNewFileName + sExtension);//保存 Response.Write("{success:true, files:'文件路径：" + filename + " 重命名" + newname + "'}");

 

演示图如下：

 

上传中：

 

 

 

上传ok：

 

 

extjs上传搞定。希望大家能多多交流相关的知识，互相提高技术水平。