How Do I Select Multiple Checkbox Simultaneously.It Is Not Working

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I have done the coding to select multiple checkbox.i.e by clicking upon one checkbox ,all should be select.but it is not working .below is my coding.please help me.

<script>
 
	checked=false;
	function checkedAll() 
	{
		var aa= document.getElementById('frm1');
 
		if(checked == false)
		{
 
			checked = true;
		}
		else
		{  
			checked = false;
		}
	
		for (var i =0; i < aa.elements.length; i++) 
		{  
			aa.elements[i].checked = checked;
		 
		}
	
	 }
  
</script>

<aside  class="right-side"> <
  <section class="content">
    <div class="row">
      <div class="col-xs-12">
        <div class="box">
          <div class="box-header">
            <h3 class="box-title">Subscriber Listing</h3>
          </div>
          <div class="box-body table-responsive">
            
            <form action="<? echo $formsubmit; ?>" id="frm1" method="post" >
              <table id="example2" class="table table-bordered table-hover">
                <thead>
                  <tr>
                    <th width="10%" style="padding-left:5px;"><input type="checkbox" onClick="checkedAll();" name="checkall">
                      Select All</th>
                     
                  </tr>
                </thead>
                <tbody>
                  
                  <tr>
                    <td width=10%><input name="chk1[]" type="checkbox" value="<?php echo $cat['new_id'];?>" id="chk1[]" class=""/></td>
                     
                  </tr>
                 
                   
                </tbody>
              </table>
            </form>
          
          </div>
        </div>
      </div>
    </div>
  </section>
</aside>

Posted 30-Dec-14 0:21am

Sradhanjali Behera

Updated 30-Dec-14 2:05am

Mike Meinz

v2

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Comments

Kornfeld Eliyahu Peter 30-Dec-14 8:23am

You can not run on all elements in side the form - not all of them are checkboxes...
Assign the same name (but different id) to all checkboxes and use getElementsByName to get ans set them...

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Peter Leow · Accepted Answer · 2014-12-30T03:51:00

Try this:

XML

<!DOCTYPE html>
<html>
<head>
<script>
function checkedAll(e) {
     var checkboxes = document.getElementsByTagName('input');

     for (var i = 0; i < checkboxes.length; i++) {
         if (checkboxes[i].type === 'checkbox') {
             checkboxes[i].checked = e.checked;
         }
    }

 }
</script>
</head>
<body>
<table>
<tr><input type="checkbox" onChange="checkedAll(this);" name="checkall">
Select All
</tr>

<tr>
<td width=10%><input name="chk1[]" type="checkbox" value="apple" >Apple</td>
</tr>

<tr>
<td width=10%><input name="chk1[]" type="checkbox" value="orange" >Orange</td>
</tr>

</table>

</body>
</html>