Question

I am trying to call changeShowTips() method in JQuery UI dialog,
however the method always returns “NOT checked!!!!”

what seems to be the problem?

    <div id="dialog-tip">
        <div>
            <input type="checkbox" name="showTips" value="showTips" checked="checked" onclick="changeShowTips();"/>Show tips on start up
        </div>
    </div>

    <script type="text/javascript">
        $(document).ready(function () {
            showTips()
        });


        function showTips() {
            $("#dialog-tip").dialog({
                height: 520,
                width: 515,
                modal: true,
            }).parents('.ui-dialog:eq(0)').wrap('<div class="black-tie"></div>');             
        }

        function changeShowTips() {
            if (showTips.checked == true) {
                alert('checked!!!');
            }
            else {
                alert('NOT checked!!!');
            }
        }

    </script>

Answer 1

That’s because in your code showTips refers to your function not the target element.

<input type="checkbox" 
       name="showTips" 
       value="showTips" 
       checked="checked" 
       onclick="changeShowTips(this);"
/> Show tips on start up

function changeShowTips(showTips) {
     if (showTips.checked) {
         alert('checked!!!');
     }
     else {
         alert('NOT checked!!!');
     }
}

http://jsfiddle.net/n74JG/