js操作DropDownList大全

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一：js 设置DropDownList选中某项

1.根据Value值设置选中某项例子如下：

HTML代码：

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<asp:DropDownList ID="ddlFolder"runat="server" SkinID="ddlSkin"AutoPostBack="false" OnSelectedIndexChanged="ddlFolder_SelectedIndexChanged"> <asp:ListItem Value="0">选项0</asp:ListItem> <asp:ListItem Value="1">选项1</asp:ListItem> </asp:DropDownList>

<asp:DropDownList ID="ddlFolder" runat="server" SkinID="ddlSkin" AutoPostBack="false" OnSelectedIndexChanged="ddlFolder_SelectedIndexChanged"> <asp:ListItem Value="0">选项0</asp:ListItem> <asp:ListItem Value="1">选项1</asp:ListItem> </asp:DropDownList>

JS代码：

document.getElementById("ddlFolder").value="0";//0为你要选中的项的value

2.根据Text值设置选中某项

var DropDownListCurrencyNew
   = document.getElementById("ddlFolder");
for(i= 0; i< DropDownListCurrencyNew.options.length; i++)
   {
          if(DropDownListCurrencyNew.options[i].text== "选项0")
           {
               DropDownListCurrencyNew.options[i].selected =true;
          }
   }

二：js读取DropDownList选中项的value和text

Value：

var selValue =document.getElementById("DropDownList1").options[document.getElementById("DropDownList1").selectedIndex].value;

Text：

var selText = document.getElementById("DropDownList1").options[document.getElementById("DropDownList1").selectedIndex].text