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。

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