JS簡(jiǎn)單操作select和dropdownlist實(shí)例

    本文實(shí)例講述了JS簡(jiǎn)單操作select和dropdownlist的方法。分享給大家供大家參考。具體實(shí)現(xiàn)方法如下：
    一、js選中服務(wù)器控件select與dropdownlist
    1. js操作服務(wù)器控件select
    復(fù)制代碼 代碼如下:<select id="selectID" onchange="return showMessage()">
    <option value="0">==請(qǐng)選擇==</option>
    <option value="1">是</option>
    <option value="2">否</option>
    </select>
    <script type="text/javascript" language="javascript">
    function showMessage() {
    if (document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value == 1) {
    alert("你好，你選擇了第 1 個(gè)");
    document.getElementById("txtContractName").setAttribute("enable",false);
    }
    else if (document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value == 2) {
    alert("你好，你選擇了第 2 個(gè)");
    }
    }
    </script>
    //js操作服務(wù)器控件dropdownlist
    <asp:DropDownList ID="ddlFolder" runat="server" SkinID="ddlSkin" AutoPostBack="false" OnSelectedIndexChanged="ddlFolder_SelectedIndexChanged">
    <asp:ListItem Value="0">選項(xiàng)0</asp:ListItem>
    <asp:ListItem Value="1">選項(xiàng)1</asp:ListItem>
    </asp:DropDownList>
    <asp:DropDownList ID="ddlFolder" runat="server" SkinID="ddlSkin" AutoPostBack="false" OnSelectedIndexChanged="ddlFolder_SelectedIndexChanged">
    <asp:ListItem Value="0">選項(xiàng)0</asp:ListItem>
    <asp:ListItem Value="1">選項(xiàng)1</asp:ListItem>
    </asp:DropDownList>
    JS代碼：
    復(fù)制代碼 代碼如下:document.getElementById("ddlFolder").value="0";//0為你要選中的項(xiàng)的value
    2. 根據(jù)Text值設(shè)置選中某項(xiàng)
    復(fù)制代碼 代碼如下:var DropDownListCurrencyNew = document.getElementById("ddlFolder");
    for(i = 0; i < DropDownListCurrencyNew.options.length; i++)
    {
    if(DropDownListCurrencyNew.options[i].text == "選項(xiàng)0")
    {
    DropDownListCurrencyNew.options[i].selected = true;
    }
    }
    二、js讀取DropDownList選中項(xiàng)的value和text
    Value：
    復(fù)制代碼 代碼如下:var selValue = document.getElementById("DropDownList1").options[document.getElementById("DropDownList1").selectedIndex].value;
    Text：
    復(fù)制代碼 代碼如下:var selText = document.getElementById("DropDownList1").options[document.getElementById("DropDownList1").selectedIndex].text;
    希望本文所述對(duì)大家的js與.net程序設(shè)計(jì)有所幫助。