Javascript Code: Check and Uncheck All

The button will check or uncheck all of the check boxes.

<!-- this script got from www.javascriptfreecode.com - Coded by: Krishna Eydat -->

<HEAD>

<SCRIPT LANGUAGE="JavaScript">

<!-- Begin
var checkflag = "false";
function check(field) {
if (checkflag == "false") {
for (i = 0; i < field.length; i++) {
field[i].checked = true;}
checkflag = "true";
return "Uncheck All"; }
else {
for (i = 0; i < field.length; i++) {
field[i].checked = false; }
checkflag = "false";
return "Check All"; }
}
//  End -->
</script>
</HEAD>

<!-- CONTINUE  -->

<BODY>

<center>
<form name=myform action="" method=post>
<table>
<tr><td>
<b>Your Favorite Scripts & Languages</b><br>
<input type=checkbox name=list value="1">Java<br>
<input type=checkbox name=list value="2">JavaScript<br>
<input type=checkbox name=list value="3">ASP<br>
<input type=checkbox name=list value="4">HTML<br>
<input type=checkbox name=list value="5">SQL<br>
<br>                                                    
<input type=button value="Check All" onClick="this.value=check(this.form.list)"> 
</td></tr>
</table>
</form>
</center>
<br />
<a target="_blank" href="https://www.javascriptfreecode.com/" style="font-size: 8pt; text-decoration: none;font-family:Tahoma">Javascript Free Code</a>

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Compatible browsers:

Tags: checkbox, check, uncheck

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Javascript Code: Check and Uncheck All

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