JS ListBox的简单功能实现代码

时间:2020-05-12 人气:0

页面效果如下：

代码也贴出来跟大家分享：

<!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> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title></title> 
</head> 
<body> 
<script language="JavaScript" type="text/javascript"> 
<!-- 
function addIt(){ 
var input = document.getElementById("input"); 
var output = document.getElementById("output"); 
for(i = 0; i < input.length; i ++ ) { 
if(input[i].selected == true) { 
if( output.length == 0){ 
var option = new Option(); 
option.text = input[i].innerText; 
output.add(option); 
}

var isExist = false; 
for(j = 0; j < output.length; j ++ ){ 
if (output[j].text == input[i].innerText){ 
isExist = true; 
break; 
} 
}

if (isExist == false){ 
var option = new Option(); 
option.text = input[i].innerText; 
output.add(option); 
} 
} 
} 
}

function deleteIt(){ 
var output = document.getElementById("output"); 
for(i = 0; i<output.length; i++){ 
if (output[i].selected == true){ 
output.options.removeChild(output[i--]); 
} 
}

} 
// --> 
</script> 
<table width="80%" border="0" align="center" style="margin-top:20px;"> 
<tr> 
<td align="right"> 
<select name="input" size="10" multiple="multiple" id="input" style="width:200px; font-size:16px"> 
<option>美元/英镑</option> 
<option>美元/港币</option> 
<option>美元/新加坡元</option> 
<option>美元/日元</option> 
<option>美元/加拿大元</option> 
<option>美元/欧元</option> 
</select> 
</td> 
<td align="center"> 
<p> 
<input type="button" name="Submit" value="增 加" onclick="addIt()"/> 
</p> 
<p> 
<input type="button" name="Submit2" value="删 除" onclick="deleteIt()"/> 
</p> 
</td> 
<td> 
<select name="output" size="10" multiple="multiple" id="output" style="width:200px; font-size:16px"> 
</select> 
</td> 
</tr> 
</table> 
</body> 
</html>

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