js limits the number of checkbox checks and php's method of getting multiple checkbbox is analyzed in depth
- 2020-07-21 07:17:05
- OfStack
The first is the code of js limiting the number of checkbbox checks:
Then there is the method of php file to get checkbbox:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title> Limit the number of check box selections </title>
<script type="text/javascript" >
function checkDate(n){
var checkedCount=0;
for(var i=0;i<myForm.course.length ;i ++){
if(myForm.course[i].checked){
checkedCount++;
}
}
if(checkedCount>n){
alert(" Can't choose more than 3 course ");
return false;
}
}
</script>
</head>
<body>
<form name="myForm" method="post" id="myForm" action="test.php">
Please choose courses for this semester ( most 3 The door ) : <br>
<input type="checkbox" name="course[]" value=" Chinese language and literature " onClick="return checkDate(3)"> Chinese language and literature <br>
<input type="checkbox" name="course[]" value=" mathematics " onClick="return checkDate(3)"> mathematics <br>
<input type="checkbox" name="course[]" value=" English " onClick="return checkDate(3)"> English <br>
<input type="checkbox" name="course[]" value=" chemical " onClick="return checkDate(3)"> chemical <br>
<input type="checkbox" name="course[]" value=" physical " onClick="return checkDate(3)"> physical <br>
<input type="checkbox" name="course[]" value=" political " onClick="return checkDate(3)"> political <br>
<input type="submit" value=" submit ">
<input type="reset" value=" cancel ">
</form>
</body>
</html>
Then there is the method of php file to get checkbbox:
<?php
$course=$_POST['course'];
for($i=0;$i<count($course);$i++)
{
if($course[$i]!="")
{
echo $course[$i]."<br/>";
}
}
?>