If we have a series or a group of check boxes then we can provide one button to check all the checkboxes at one go and another button to uncheck all the checked buttons by using client side JavaScript. This way the user in a single attempt can check or uncheck all the buttons. Note that this is a client side JavaScript feature so JavaScript execution is to be enabled in the client browser.

There are different ways to achieve this result; we can keep two buttons for this. One button will check all the checkboxes and other button will uncheck all the buttons. The same result we can achieve by using a single buttons also. We can also keep one checkbox to get the same functionality. When we check the single checkbox we can make all the checkboxes checked and by uncheck we can make all the checkboxes uncheck( Inside mailbox of hotmail.com you can see this ) . Let us start with two buttons first. One for check all and other for Uncheck all .

Here is the demo.

Scripts for Web design and programming
ASP
PHP
JavaScript
HTML
MySQL
Check Control

Here is the code for head part of the script

<SCRIPT LANGUAGE="JavaScript">
<!--

<!-- Begin
function Check(chk)
{
if(document.myform.Check_ctr.checked==true){
for (i = 0; i < chk.length; i++)
chk[i].checked = true ;
}else{

for (i = 0; i < chk.length; i++)
chk[i].checked = false ;
}
}

// End -->
</script>

Here is the code for body part .

<form name="myform" action="checkboxes.asp" method="post">
<b>Scripts for Web design and programming</b><br>
<input type="checkbox" name="check_list" value="1">ASP<br>
<input type="checkbox" name="check_list" value="2">PHP<br>
<input type="checkbox" name="check_list" value="3">JavaScript<br>
<input type="checkbox" name="check_list" value="4">HTML<br>
<input type="checkbox" name="check_list" value="5">MySQL<br>

<input type="checkbox" name="Check_ctr" value="yes"
onClick="Check(document.myform.check_list)"><b>Check Control</b>

</form>

Javascript Form Validation Period button Validation of a form How to limit number of checkboxes allowed to be clicked inside a form Checkbox Validation of a form Displaying checked value of a check box array All Checking & Un checking in a group of checkboxes by single button Adding options to a drop down list box Removing options from a drop down list box Moving options from one drop down list box to other Dynamic population of second list box based on value of first list box