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。