JS 获取select(多选下拉)中所选值的示例代码

2019-11-20 22:27:57

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 
<html> 
<head> 
<title> New Document </title> 
<meta name="Generator" content="EditPlus"> 
<meta name="Author" content=""> 
<meta name="Keywords" content=""> 
<meta name="Description" content=""> 
</head> 
<body> 

<script language="JavaScript"> 
<!-- 
function checkselect(objname){ 
o = document.getElementById(objname); 
t = document.getElementById("output"); 
var count=0; 
var intvalue=""; 
for(i=0;i<o.length;i++){ 
if(o.options[i].selected){ 
intvalue+=o.options[i].value+","; 
count++; 
} 
} 
t.value=intvalue.substr(0,intvalue.length-1); 
alert(count); 

} 
//--> 
</script> 
<select name="objsel" size=8 multiple> 
<option value="0" selected>请选择 
<option value="1">测试一 
<option value="2">测试二 
<option value="3">测试三 
<option value="4">测试四 
<option value="5">测试五 
</select> 
<input type="button" onclick="checkselect('objsel');" value="输出"> 
选中的项目：<input type="text" name="output"> 
</body> 
</html> 