前些日子公司让做一个功能模块。对于里面一个小功能费了些周折，现将其总结一下：
一、实现效果：
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一、实现代码1：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>select标签multiple属性的用法</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<script type="text/javascript"> /**
* @param fromSelectId option移动起始select标签id
* @param toSelectId option移动目的地select标签id
* @param addOrNot boolean类型——true表示当前进行的是加入操作，否则是删除操作
* @param moveAllOrNot boolean类型——true表示当前进行的是“所有”操作，否则当前进行的不是“所有”操作
*/
function moveOptions(fromSelectId, toSelectId, addOrNot, moveAllOrNot){
var fromObject = document.getElementById(fromSelectId);
var toObject = document.getElementById(toSelectId);
if(fromObject.options.length == 0){
if(addOrNot){
alert("没有找到可加入的选项！ ");
}else{
alert("没有找到可删除的选项！");
}
return;
} if(fromObject.selectedIndex == -1 && moveAllOrNot == false){
if(addOrNot){
alert("请先选择要加入的选项。");
}else{
alert("请先选择要删除的选项！");
}
return;
} var toSelectOptionsList = new Array(toObject.options.length);//存放option移动目的地select标签所有option选项
var toSelectOptionPointer = 0;
for(; toSelectOptionPointer < toObject.options.length; toSelectOptionPointer ++){//将option移动目的地原有option选项存放到toSelectOptionsList数组中
if(toObject.options[toSelectOptionPointer] != null){
toSelectOptionsList[toSelectOptionPointer] = new Option(toObject.options[toSelectOptionPointer].text, toObject.options[toSelectOptionPointer].value);
}
} for(var i = 0; i < fromObject.options.length; i ++){
if(fromObject.options[i] != null && (fromObject.options[i].selected == true || moveAllOrNot)){//将新加入的option选项存放到toSelectOptionsList数组中
toSelectOptionsList[toSelectOptionPointer] = new Option(fromObject.options[i].text, fromObject.options[i].value);
toSelectOptionPointer ++;
}
} for(var i = 0; i < toSelectOptionsList.length; i ++){//又一次整合option移动目的地select标签的option选项，以使新加入的显示出来
if(toSelectOptionsList[ i ] != null){
toObject.options[ i ] = toSelectOptionsList[ i ];
}
} for(var i = fromObject.options.length - 1; i >= 0; i --){//又一次整合option移动起始select标签的option选项。以便去掉删除的option选项
if(fromObject.options[i] != null && (fromObject.options[i].selected == true || moveAllOrNot)){
fromObject.options[i] = null;
}
}
} function getSelectedValues(){
var selectedValues = "";
var rightSelectObject = document.getElementById("rightSelect");
for(var i=0; i<rightSelectObject.options.length; i++){
selectedValues = rightSelectObject.options[i].value + ',' + selectedValues;
}
selectedValues = selectedValues.substring(0, selectedValues.lastIndexOf(','));
if(selectedValues == ""){
alert("你没有选择不论什么选项！！ ！ ");
}else{
alert("你选中的值为：" + selectedValues);
}
}
</script>
</head> <body>
<center style="margin-top:12%"><font color="red" size="5"><b>select标签multiple属性的用法</b></font></center>
<br/>
<table border="1" cellspacing="0" align="center">
<tr>
<td align="center" width="150px">未选择</td>
<td align="center" width="150px">操作</td>
<td align="center" width="150px">已选择</td>
</tr>
<tr>
<td align="center" width="150px">
<select id="leftSelect" name="leftSelect" multiple="multiple" size="15" style="width:100%; height:100%;">
<option value="07c9907f-bfb1-4e37-98e6-02224834ef76">荸荠</option>
<option value="4e1c083f-c988-48b9-9a48-ff7dbe07e51f">胡桃</option>
<option value="0e685a36-ddd1-4288-b741-8624e4384b58">杨梅</option>
<option value="0fc09295-ed4d-4e79-9c11-2f0913b421a6">沙枣</option>
<option value="1cb5eccc-faa3-44df-ba62-bb5fcdf29036">脐橙</option>
<option value="26e545ae-3647-45aa-8b9f-cef6a8d8c454">芒果</option>
<option value="2788bd4d-53c2-4571-a562-b8c47e058ff4">枇杷</option>
<option value="2ab7393a-7478-4451-bb63-e8a91dc63adb">金桔</option>
<option value="51160f28-44ab-419d-948c-16ba1370613a">青梅</option>
<option value="baa4df9c-e6f9-4d4d-bfb8-648394942170">毛桃</option>
<option value="1854fd23-7da0-4d3f-bf4b-21ed97037a0f">金桔</option>
<option value="43a0912c-ba1b-4700-8616-31f701098b0a">酸橙</option>
<option value="37a76cf1-0b11-411a-8ce3-bb37383951c4">海棠</option>
<option value="78a49dc8-3920-47ff-9a3e-b6e31d337d67">槟榔</option>
<option value="26852cb9-3cde-4b50-bf52-0ad838822665">杨桃</option>
<option value="a52b4681-2c1b-4520-ab8a-6507b52c2105">樱桃</option>
<option value="8d3d65f7-5252-4f47-9c9a-960367b06ba7">芭乐</option>
<option value="7b361600-7c77-44a5-8e03-c043ebddc710">鳄梨</option>
<option value="5c2f062b-3fd2-44c1-a8e2-0546454978d9">西柚</option>
</select>
</td>
<td align="center" width="150px">
<input type="button" onclick="moveOptions('leftSelect', 'rightSelect', true, false);" value="加入 >>" style="text-align:center; margin-bottom:10px; width:90px;"/>
<br/>
<input type="button" onclick="moveOptions('rightSelect', 'leftSelect', false, false);" value="删除 <<" style="text-align:center; margin-bottom:10px; width:90px;"/>
<br/>
<input type="button" onclick="moveOptions('leftSelect', 'rightSelect', true, true);" value="所有加入 >>" style="margin-bottom:10px; width:90px;"/>
<br/>
<input type="button" onclick="moveOptions('rightSelect', 'leftSelect', false, true);" value="所有删除 <<" style="margin-bottom:10px; width:90px;"/>
<br/>
</td>
<td align="center" width="150px">
<select id="rightSelect" name="rightSelect" multiple="multiple" size="15" style="width:100%; height:100%;"></select>
</td>
</tr>
</table>
<br/>
<center><input type="button" value="获取选项的value值" onclick="getSelectedValues();"/></center>
</body>
</html>
【0分下载资源】
二、实现代码2：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>select标签multiple属性的用法</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<script type="text/javascript"> /**
* @param fromSelectId option移动起始select标签id
* @param toSelectId option移动目的地select标签id
* @param addOrNot boolean类型——true表示当前进行的是加入操作，否则是删除操作
* @param moveAllOrNot boolean类型——true表示当前进行的是“所有”操作，否则当前进行的不是“所有”操作
*/
function moveOptions(fromSelectId, toSelectId, addOrNot, moveAllOrNot){
var fromObject = document.getElementById(fromSelectId);
var toObject = document.getElementById(toSelectId);
if(fromObject.options.length == 0){
if(addOrNot){
alert("没有找到可加入的选项！");
}else{
alert("没有找到可删除的选项！ ");
}
return;
} if(fromObject.selectedIndex == -1 && moveAllOrNot == false){
if(addOrNot){
alert("请先选择要加入的选项！ ");
}else{
alert("请先选择要删除的选项！ ");
}
return;
} var toSelectOptionsList = new Array(toObject.options.length);//存放option移动目的地select标签所有option选项
var toSelectOptionPointer = 0;
for(; toSelectOptionPointer < toObject.options.length; toSelectOptionPointer ++){//将option移动目的地原有option选项存放到toSelectOptionsList数组中
if(toObject.options[toSelectOptionPointer] != null){
toSelectOptionsList[toSelectOptionPointer] = new Option(toObject.options[toSelectOptionPointer].text, toObject.options[toSelectOptionPointer].value);
}
} for(var i = 0; i < fromObject.options.length; i ++){
if(fromObject.options[i] != null && (fromObject.options[i].selected == true || moveAllOrNot)){//将新加入的option选项存放到toSelectOptionsList数组中
toSelectOptionsList[toSelectOptionPointer] = new Option(fromObject.options[i].text, fromObject.options[i].value);
toSelectOptionsList[toSelectOptionPointer].title = fromObject.options[i].text;
toSelectOptionPointer ++;
}
} for(var i = 0; i < toSelectOptionsList.length; i ++){//又一次整合option移动目的地select标签的option选项。以使新加入的显示出来
if(toSelectOptionsList[ i ] != null){
toObject.options[ i ] = toSelectOptionsList[ i ];
}
} for(var i = fromObject.options.length - 1; i >= 0; i --){//又一次整合option移动起始select标签的option选项，以便去掉删除的option选项
if(fromObject.options[i] != null && (fromObject.options[i].selected == true || moveAllOrNot)){
fromObject.options[i] = null;
}
}
} function getSelectedValues(){
var selectedValues = "";
var rightSelectObject = document.getElementById("rightSelect");
for(var i=0; i<rightSelectObject.options.length; i++){
selectedValues = rightSelectObject.options[i].value + ',' + selectedValues;
}
selectedValues = selectedValues.substring(0, selectedValues.lastIndexOf(','));
if(selectedValues == ""){
alert("你没有选择不论什么选项。！。");
}else{
alert("你选中的值为：" + selectedValues);
}
}
</script>
</head> <body>
<center style="margin-top:12%"><font color="red" size="5"><b>select标签multiple属性的用法</b></font></center>
<br/>
<table border="1" cellspacing="0" align="center">
<tr>
<td align="center" width="150px">未选择</td>
<td align="center" width="150px">操作</td>
<td align="center" width="150px">已选择</td>
</tr>
<tr>
<td align="center" width="150px">
<select id="leftSelect" name="leftSelect" multiple="multiple" size="15" style="width:100%; height:100%;">
<option value="0fc09295-ed4d-4e79-9c11-2f0913b421a6" title="沙枣">沙枣</option>
<option value="1cb5eccc-faa3-44df-ba62-bb5fcdf29036" title="脐橙">脐橙</option>
<option value="26e545ae-3647-45aa-8b9f-cef6a8d8c454" title="芒果">芒果</option>
<option value="2788bd4d-53c2-4571-a562-b8c47e058ff4" title="枇杷">枇杷</option>
<option value="2ab7393a-7478-4451-bb63-e8a91dc63adb" title="金桔">金桔</option>
<option value="51160f28-44ab-419d-948c-16ba1370613a" title="青梅">青梅</option>
<option value="baa4df9c-e6f9-4d4d-bfb8-648394942170" title="毛桃">毛桃</option>
<option value="43a0912c-ba1b-4700-8616-31f701098b0a" title="酸橙">酸橙</option>
<option value="37a76cf1-0b11-411a-8ce3-bb37383951c4" title="海棠">海棠</option>
<option value="78a49dc8-3920-47ff-9a3e-b6e31d337d67" title="槟榔">槟榔</option>
<option value="26852cb9-3cde-4b50-bf52-0ad838822665" title="杨桃">杨桃</option>
<option value="a52b4681-2c1b-4520-ab8a-6507b52c2105" title="樱桃">樱桃</option>
<option value="8d3d65f7-5252-4f47-9c9a-960367b06ba7" title="芭乐">芭乐</option>
<option value="7b361600-7c77-44a5-8e03-c043ebddc710" title="鳄梨">鳄梨</option>
<option value="5c2f062b-3fd2-44c1-a8e2-0546454978d9" title="西柚">西柚</option>
</select>
</td>
<td align="center" width="150px">
<input type="button" onclick="moveOptions('leftSelect', 'rightSelect', true, false);" value="加入 >>" style="text-align:center; margin-bottom:10px; width:90px;"/>
<br/>
<input type="button" onclick="moveOptions('rightSelect', 'leftSelect', false, false);" value="删除 <<" style="text-align:center; margin-bottom:10px; width:90px;"/>
<br/>
<input type="button" onclick="moveOptions('leftSelect', 'rightSelect', true, true);" value="所有加入 >>" style="margin-bottom:10px; width:90px;"/>
<br/>
<input type="button" onclick="moveOptions('rightSelect', 'leftSelect', false, true);" value="所有删除 <<" style="margin-bottom:10px; width:90px;"/>
<br/>
</td>
<td align="center" width="150px">
<select id="rightSelect" name="rightSelect" multiple="multiple" size="15" style="width:100%; height:100%;">
<option value="07c9907f-bfb1-4e37-98e6-02224834ef76" title="荸荠">荸荠</option>
<option value="4e1c083f-c988-48b9-9a48-ff7dbe07e51f" title="胡桃">胡桃</option>
<option value="0e685a36-ddd1-4288-b741-8624e4384b58" title="杨梅">杨梅</option>
</select>
</td>
</tr>
</table>
<br/>
<center><input type="button" value="获取选项的value值" onclick="getSelectedValues();"/></center>
</body>
</html>
对照代码1和代码2：
两段代码实现的效果是一样的，唯一的差别在于代码2中为每一个option标签加入了title属性——主要为了应对option选项长度超过select宽度时能为用户提供更好的用户体验。