js操作DropDownList大全

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：

view plaincopy to clipboardprint?

<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