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JS implements the function of exchanging left and right lists with each other

php中世界最好的语言Original: 2018-05-08 11:48:491868browse

This time I will bring you the function of exchanging left and right lists with JS. What are the precautions for exchanging left and right lists with JS? The following is a practical case, let’s take a look.

Implementation functions:

1. Add the content of the left drop-down box to the right drop-down box, support multi-select movement, and remove the right drop-down box object at the same time ;

2. Supports moving the upper and lower positions of items in the list;

3. The rendering is as follows:

Html code

<HTML> 
<HEAD> 
<TITLE>选择下拉菜单</TITLE> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> 
<META NAME="Description" CONTENT="Power by hill"> 
</HEAD> 
<BODY> 
<p>选定一项或多项然后点击添加或移除(按住shift或ctrl可以多选)，或在选择项上双击进行添加和移除。</p> 
<form method="post" name="myform"> 
<table border="0" width="300"> 
<tr> 
<td width="40%"> 
<select style="WIDTH:100%" multiple name="list1" size="12" ondblclick="moveOption(document.myform.list1, document.myform.list2)"> 
<option value="北京">北京</option> 
<option value="上海">上海</option> 
<option value="山东">山东</option> 
<option value="安徽">安徽</option> 
<option value="重庆">重庆</option> 
<option value="福建">福建</option> 
<option value="甘肃">甘肃</option> 
<option value="广东">广东</option> 
<option value="广西">广西</option> 
<option value="贵州">贵州</option> 
<option value="海南">海南</option> 
<option value="河北">河北</option> 
<option value="黑龙江">黑龙江</option> 
</select> 
</td> 
<td width="20%" align="center"> 
<input type="button" value="添加" onclick="moveOption(document.myform.list1, document.myform.list2)"><br/> 
<br/> 
<input type="button" value="删除" onclick="moveOption(document.myform.list2, document.myform.list1)"> 
</td> 
<td width="40%"> 
<select style="WIDTH:100%" multiple name="list2" size="12" ondblclick="moveOption(document.myform.list2, document.myform.list1)"> 
</select> 
</td> 
<td> 
<button onclick="changepos(list2,-1)" type="button">上移</button> 
<br/> 
<button onclick="changepos(list2,1)" type="button">下移</button> 
</td> 
</tr> 
</table> 
值：<input type="text" name="city" size="40"> 
</form> 
<script language="JavaScript"> 
<!-- 
function moveOption(e1, e2){ 
try{ 
for(var i=0;i<e1.options.length;i++){ 
if(e1.options[i].selected){ 
var e = e1.options[i]; 
e2.options.add(new Option(e.text, e.value)); 
e1.remove(i); 
ii=i-1 
} 
} 
document.myform.city.value=getvalue(document.myform.list2); 
} 
catch(e){} 
} 
function getvalue(geto){ 
var allvalue = ""; 
for(var i=0;i<geto.options.length;i++){ 
allvalue +=geto.options[i].value + ","; 
} 
return allvalue; 
} 
function changepos(obj,index) 
{ 
if(index==-1){ 
if (obj.selectedIndex>0){ 
obj.options(obj.selectedIndex).swapNode(obj.options(obj.selectedIndex-1)) 
} 
} 
else if(index==1){ 
if (obj.selectedIndex<obj.options.length-1){ 
obj.options(obj.selectedIndex).swapNode(obj.options(obj.selectedIndex+1)) 
} 
} 
} 
//--> 
</script> 
</BODY> 
</HTML>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

JS implements the function of exchanging left and right lists with each other

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