Programatically Check the input with type of checkbox using javascript code example

Example: Programatically Check the input with type of checkbox using javascript

<script type="text/javascript">
    function selectAll() {
        var items = document.getElementsByName('acs');
        for (var i = 0; i < items.length; i++) {
            if (items[i].type == 'checkbox')
                items[i].checked = true;
        }
    }

    function UnSelectAll() {
        var items = document.getElementsByName('acs');
        for (var i = 0; i < items.length; i++) {
            if (items[i].type == 'checkbox')
                items[i].checked = false;
        }
    }			
</script>