Check/ Uncheck all checkbox of a Html Table

Question

i have got a HTML table which contain a check box in and other checkboxes in i want that all 's checkboxes should be checked /unchecked on basis of 's Check box... please help me resolve this... i wrote follwoing code. but its not working..

   <script language="javascript" type="text/javascript">
  function SelectAll(id) {

    var frm = document.getElementById('tblemail');

    for (i=0;i<frm.elements.length;i++) {

        if (frm.elements[i].type == "checkbox") {

            frm.elements[i].checked = document.getElementById(id).checked;

        }

    }

} 

</script>

Answer 1

Try the following code

var frm = document.getElementById('tblemail').getElementsByTagName("input");
var len = frm.length;
var checkedStatus = document.getElementById(id).checked;

for (i=0;i<len;i++) 
{
    if (frm[i].type === "checkbox") 
    {    
        frm[i].checked = checkedStatus;
    }
}

Answer 2

Have you Tried

document.getElementById(id).checked = true