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Editorial Team
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Asked: 2026-05-26T14:13:10+00:00

Hi All First of all I don’t know Javascript, I got this script from

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Hi All First of all I don’t know Javascript, I got this script from the internet but can’t get it to work. If someone can please be so kind and assist me. I’m trying to create a “check all” & “uncheck all” button on my form for my checkboxes, if I click the button it does not select anything. Where am I going wrong?

<?php
session_start();
?>
<head>
<SCRIPT LANGUAGE="JavaScript">
<!--

<!-- Begin
function CheckAll(chk)
{
for (i = 0; i < chk.length; i++)
chk[i].checked = true ;
}

function UnCheckAll(chk)
{
for (i = 0; i < chk.length; i++)
chk[i].checked = false ;
}
// End -->
</script>
</head>

And then the form:

$sql0 = "SELECT * FROM .....
$result0 = mysql_query($sql0);
echo "<form name='myform' action='...' method='post'>";
while($row0 = mysql_fetch_assoc($result0)) {
   $test_id=$row0['id'];
   $test_name=$row0['test_name'];

echo "  <table width=600px>";
echo "      <tr>";
echo "          <td width=30px><input name='question[$test_id][]' type='checkbox' value='1' /></td>";
echo "          <td width=580px align=left>$test_name</td>";
echo "      </tr>";
echo "  </table>";
}
echo "</P>";
echo "<input type='button' name='Check_All' value='Check All' onClick='CheckAll(document.myform.check_list)'>";
echo "<input type='button' name='Un_CheckAll' value='Uncheck All' onClick='UnCheckAll(document.myform.check_list)'>";
echo "</form>";
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1 Answer

  1. Editorial Team

    I’d highly recommend using jQuery, it allows you to focus on the logic and not worry about cross browser issues you might run into.

    <script src='http://code.jquery.com/jquery-1.6.3.min.js' type='text/javascript'></script>
<script>
$(document).ready(function () {
   //check all
   $('input[name="Check_All"]').click(function () {
      //for all checkboxes where the name begins with "question", check them
      $('input[name^="question"]').attr('checked', true);
   });

   //uncheck all
   $('input[name="Un_CheckAll"]').click(function () {
      //for all checkboxes where the name begins with "question", uncheck them
      $('input[name^="question"]').attr('checked', false);
   });
});
</script>

    Here’s the breakdown…

    Select all buttons on the page where the name attribute is set to Check_all

    $('input[name="Check_All"]')

    When the found item(s) are clicked, execute the code in the function that is passed

    $('input[name="Check_All"]').click(function () {
    //javascript code here
});

    for all checkboxes where the name begins with “question”, check them

    $('input[name^="question"]').attr('checked', true);
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