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Question

How do I add a checkbox that can check all the checkboxes if it's checked?

How can I add show/hide functionality to the "check all" checkbox. The submit button also need to be showed if the check all checkbox is checked.

$(document).ready(function() {

var $submit = $("#submit_prog").hide(),
    $cbs = $('input[name="prog"]').click(function() {
        $submit.toggle( $cbs.is(":checked") );
    });

});

<input type="checkbox" name="?" value="?">  // check all checkbox

<input type="checkbox" name="prog" value="1">
<input type="checkbox" name="prog" value="2">

<input type="submit" id="submit_prog" value='Submit' />

Answer 1

1. assumption id of select all chckbox is selall.
   
2. create a class for all the check box you want to select using select all

$('#selall').click(function(event) {   
    if(this.checked) {
        // Iterate each checkbox
        $('.yourchckbox').each(function() {
            this.checked = true;                        
        });
        $('#submit_prog').show();
    }
    else { 
    $('.yourchckbox').each(function() 
    { this.checked = false; }); 
    $('#submit_prog').hide()
    }
});
  $('.yourchckbox').click(function(event) { 
   if(!(this.checked)) {
   $('#selall').prop('checked', false);   
   }

  });

Answer 2

Give the select all check box an id, say selectall then

$('#selectall').click(function(){
    if (this.checked){
        $('input[name="prog"]').prop('checked', true);
        $submit.toggle( true );
    }
});

if you want the checkboxes to be unselected if the select all in unselected

$('#selectall').click(function(){
    $('input[name="prog"]').prop('checked', this.checked);
    $submit.toggle( this.checked);
});

$cbs = $('input[name="prog"]').click(function() {
    $submit.toggle( $cbs.filter(':checked').length == 0 );
    if (!this.checked) $('#selectall').prop('checked', false);
});

Answer 3

Try

$('input:checkbox[name!="prog"]').click(function(){
     $('input:checkbox[name="prog"]').prop('checked', $(this).is(':checked'))
})

Or if you can change checkbox id to selall

$('#selall').click(function(){
     $('input:checkbox').prop('checked', $(this).is(':checked'))
})

Answer 4

Its quite simple.

lets name this checkbox <input type="checkbox" name="check_all" value="1">

And now add event:

$('input[name="check_all"]').click( function() {
    if( $(this).is(':checked') ) {
        $('input[name="prog"]').attr('checked', 'checked');
    } else {
        $('input[name="prog"]').removeAttr('checked');
    }

    $('input[name="prog"]:eq(0)').change(); //firing event which we will catch
});

Then we should check if all input[name="prog"] are checked:

$('input[name="prog"]').change( function() {
    if( $('input[name="prog"]:not(:checked)').length ) {
        $('#submit_prog').hide();
    } else {
        $('#submit_prog').show();
    }
});

Answer 5

select all checkboxes on #all check and check #all when all checkboxes are checked

 <SCRIPT language="javascript">
    $(function(){

        $("#all").click(function () {
              $('.one').attr('checked', this.checked);
     if (this.checked) {$('#submit_prog').hide();}
(this.checked)?$('#submit_prog').show():$('#submit_prog').hide();
        });

        $(".one").click(function(){

            if($(".one").length == $(".one:checked").length) {
                $("#all").attr("checked", "checked");
                $('#submit_prog').show();
            } else {
                $("#all").removeAttr("checked");
$('#submit_prog').hide();
            }

        });
    });
    </SCRIPT>

Change id and class of checkboxes

<input type="checkbox" id="all" >  // check all checkbox

<input type="checkbox" name="prog" class="one" value="1">
<input type="checkbox" name="prog" class="one" value="2">