jQuery: establishing a relation between check-all checkbox and the child checkboxes -


this standard scenario have check-all checkbox check or uncheck group of checkboxes based on own state.

$('.checkall').on('click', function () {     $(this)         .closest('#grid')         .find('#tblid')         .find(':checkbox')         .prop('checked', this.checked); });

if child checkboxes modified individually, manipulate state of check-all checkbox this:

$('.child-checkbox').change(function () {     if ($('.child-checkbox:checked').length == $('.child-checkbox').length) {         $('.checkall').prop('checked', true);     }     else {         $('.checkall').prop('checked', false);     } });

i happy working expected, want know if can combine these 2 snippets in such way relation between check-all checkbox , child checkboxes managed in 1 snippet.

i don't think can nicely combined 1 snippet, can see can simplified 

var $all = $('.checkall').on('click', function () {     $childs.prop('checked', this.checked); }); var $children = $('.child-checkbox').change(function () {     $all.prop('checked', $children.not(':checked').length != 0); });

if still looking single handler try

$('.checkall, .child-checkbox').change(function () {     if ($(this).is('.checkall')) {         $('.child-checkbox').prop('checked', this.checked);     } else {         $('.checkall').prop('checked', $children.not(':checked').length != 0);     } })

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