how to enable checkboxes based on textbox value?

Question

I a trying to set my group of checkboxes enabled when the value is not empty in my textbox (myinput) otherwise disable the group but it does not work as expected? what am i doing wrong?

html

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script type="text/javascript">

        function enable_cb() {
               if ($(this).val() != "" ) {
                $("input.group1").removeAttr("disabled");
            }
            else {
                $("input.group1").attr("disabled", true);
            }
        }

    </script>
</head>
<body>
    <form name="frmChkForm" id="frmChkForm">
    <input id="mytext" type="text" onkeydown="enable_cb(this);" />

    <input type="checkbox" name="chk9[120]" class="group1">
    <input type="checkbox" name="chk9[140]" class="group1">
    <input type="checkbox" name="chk9[150]" class="group1">
    </form>
</body>
</html>

awe · Accepted Answer · 2011-12-14 11:47:33Z

3

You need to declare the input parameter on the method. 'this' is not automagically sent to the method.

   function enable_cb(textbox) { 
           if ($(textbox).val() != "" ) { 
            $("input.group1").removeAttr("disabled"); 
        } 
        else { 
            $("input.group1").attr("disabled", true); 
        } 
    }

answered Dec 14, 2011 at 11:47

awe

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1 Comment

David Hedlund Over a year ago

Or better yet, assign the event listener from jQuery, and stick to $(this).

zoran119 · Accepted Answer · 2011-12-14 11:46:56Z

-2

have you tried just using $(".group1") or $(".group1 input")?

answered Dec 14, 2011 at 11:46

zoran119

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1 Comment

David Hedlund Over a year ago

.group1 would give the exact same result as the current code. .group1 input would not work, as it would look for an input that is a child of a .group1 element. This is entirely unrelated to the problem.

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