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左右list javascript简单实现

2011-09-22 17:09 344 查看

<html>

<head>

<meta http-equiv="Content-Type " content="text/html; charset=gb2312 ">

<title>list测试</title>

</head>

<body>

<div style="font-size: 10pt;">

注1：左右移动进行选取

<br />

<br />

注：本页面仅在IE6/FireFox1.5下测试过。其它浏览器或其它版本未经测试。

<br />

<hr />

</div>

<form name="frm">

<table>

<tr>

<td>

<select name="SrcSelect" size="6" style="font-size: 11pt; width: 160px; height: 160px"

multiple="multiple" ondblclick="moveLeftOrRight(document.frm.SrcSelect,document.frm.ObjSelect) ">

<option value="1">讲师</option>

</select>

</td>

<td width="30px">

<input align="left" type="button" value="> " onclick="moveLeftOrRight(document.frm.SrcSelect,document.frm.ObjSelect) ">

<br>

<br>

<input align="left" type="button" value=" < " onclick="moveLeftOrRight(document.frm.ObjSelect,document.frm.SrcSelect) ">

</td>

<td>

<select name="ObjSelect" size="6" style="font-size: 11pt; width: 160px; height: 160px"

multiple="multiple" ondblclick="moveLeftOrRight(document.frm.ObjSelect,document.frm.SrcSelect) ">

<option value="2">教学管理员</option>

<option value="3">超级管理员</option>

</select>

</td>

</tr>

</table>

</form>

</body>

<script type="text/javascript" language="javascript">

//上移

function moveUp() {

var theObjOptions = document.frm.ObjSelect.options;

for (var i = 1; i < theObjOptions.length; i++) {

if (theObjOptions[i].selected && !theObjOptions[i - 1].selected) {

swapOptionProperties(theObjOptions[i], theObjOptions[i - 1]);

}

}

}

//下移

function moveDown() {

var theObjOptions = document.frm.ObjSelect.options;

for (var i = theObjOptions.length - 2; i > -1; i--) {

if (theObjOptions[i].selected && !theObjOptions[i + 1].selected) {

swapOptionProperties(theObjOptions[i], theObjOptions[i + 1]);

}

}

}

function swapOptionProperties(option1, option2) {

var tempStr = option1.value;

option1.value = option2.value;

option1.value = tempStr;

tempStr = option1.text;

option1.text = option2.text;

option2.text = tempStr;

tempStr = option1.selected;

option1.selected = option2.selected;

option2.selected = tempStr;

}

//列表框的位置移动

function moveLeftOrRight(fromObj, toObj) {

for (var i = 0; i < fromObj.length; i++) {

var srcOption = fromObj.options[i];

if (srcOption.selected) {

toObj.appendChild(srcOption);

i--;

}

}

}

</script>

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