dropdownlist js的两种选中方法

 

<asp:DropDownList ID="DropDownList1" runat="server">
    <asp:ListItem Value="0" Selected="True">请选择</asp:ListItem>
    <asp:ListItem Value="1">你好</asp:ListItem>
    <asp:ListItem Value="2">请进</asp:ListItem>
    </asp:DropDownList>

1.通过text

var ddlgradelevel=document.getElementById("DropDownList1") ; 

            for (var i = 0; i < ddlgradelevel.options.length; i++) {
                if (ddlgradelevel.options[i].text == "你好") {
                    ddlgradelevel.options[i].selected = true;
                }
            }

 

2.通过value

document.getElementById("DropDownList1").value="1";