<html>
<head>
<script language="javascript">
function add(obj)
{var VL=obj.nextSibling.data;
if(obj.checked){
document.getElementById('t1').value+=VL;
}
else
{
document.getElementById('t1').value=document.getElementById('t1').value.replace(VL,'');
}
}
</script>
</head>
<form>
<body>
<input type="checkbox" name="chk1" id="chk1" onclick="add(this)">11
<input type="checkbox" name="chk2" id="chk2" onclick="add(this)">22
<input type="checkbox" name="chk3" id="chk3" onclick="add(this)">33
<input type="checkbox" name="chk4" id="chk4" onclick="add(this)">44
<input type="checkbox" name="chk5" id="chk5" onclick="add(this)">55
<input type="text" name="t1" id="t1">
</body>
</form>
</html>
要限制最多只选择三个复选框要怎么加上呢?
在add函数里加上if (count >= 3)
{
alert("最多只能添加三个!");
return;
}
<head>
<script language="javascript">
var TotalCount=0;
function add(obj)
{
var VL=obj.nextSibling.data;
if(obj.checked){if(TotalCount<3)
{
TotalCount++;
document.getElementById('t1').value+=VL;
}
else
obj.checked=false;
}
else
{
TotalCount--;
document.getElementById('t1').value=document.getElementById('t1').value.replace(VL,'');
}
}
</script>
</head>
<form>
<body>
<input type="checkbox" name="chk1" id="chk1" onclick="add(this)">11
<input type="checkbox" name="chk2" id="chk2" onclick="add(this)">22
<input type="checkbox" name="chk3" id="chk3" onclick="add(this)">33
<input type="checkbox" name="chk4" id="chk4" onclick="add(this)">44
<input type="checkbox" name="chk5" id="chk5" onclick="add(this)">55
<input type="text" name="t1" id="t1">
</body>
</form>
</html>
<!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>无标题文档</title>
</head>
<body>
文本框:<input id="t" type="text" size="100" \><br \>
<input id="1" type="checkbox" onclick="output()" \>复选框1<br \>
<input id="2" type="checkbox" onclick="output()" \>复选框2<br \>
<input id="3" type="checkbox" onclick="output()" \>复选框3<br \>
<input id="4" type="checkbox" onclick="output()" \>复选框4<br \>
<script type="text/javascript">
function output(){
document.getElementById("t").value ="";
var a = [];
for(i=1;i<=4;i++){
a[i] = eval("document.getElementById('" + i + "')");
if (a[i].checked){
document.getElementById("t").value = document.getElementById("t").value + a[i].nextSibling.nodeValue;
}
}
}
</script>
</body>
</html>
<html>
<head>
<script language="javascript">
var count=0;
function add(obj)
{
var VL=obj.nextSibling.data;
if(obj.checked){
count++;
document.getElementById('t1').value+=VL;
}
else
{
count--;
document.getElementById('t1').value=document.getElementById('t1').value.replace(VL,'');
}
if(count==3)
{
alert("no");
}
}
</script>
</head>
<form>
<body>
<input type="checkbox" name="chk1" id="chk1" onclick="add(this)">11
<input type="checkbox" name="chk2" id="chk2" onclick="add(this)">22
<input type="checkbox" name="chk3" id="chk3" onclick="add(this)">33
<input type="checkbox" name="chk4" id="chk4" onclick="add(this)">44
<input type="checkbox" name="chk5" id="chk5" onclick="add(this)">55
<input type="text" name="t1" id="t1">
</body>
</form>
</html>
else
{
obj.checked=false;
alert("no");
}