check if a checkbox is checked jquery

Question

Does anyone know why this isn't working. It will always print 'unchecked'.

<html>
<head>
<script type="text/javascript" src="jquery.js"></script>

<script type="text/javascript">

function msg(x)
{

if($(x).attr('checked')){
  alert('checked!!');
}
else{
  alert('unchecked');
}

}

</script>


</head>
<body>

<form>
<input type="checkbox" id="fname2" onClick="msg(this.id)" /><br/>

</form>

</body>
</html>

gen_Eric · Accepted Answer · 2010-11-15 05:08:23Z

6

You are sending this.id to the function, then you are wrapping it in the $(). This does not work. You need just to send this to msg: onClick="msg(this)".

answered Nov 15, 2010 at 5:08

gen_Eric

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1 Comment

gen_Eric Over a year ago

If you want to send IDs to msg, you need to do: $('#'+x).

Nikola K. · Accepted Answer · 2012-07-22 12:18:28Z

2

Use

function chkChecked(elmt) {
    if($(elmt).is(':checked')) {
        alert('checked!!');
    }
    else alert('unchecked');
}

edited Jul 22, 2012 at 12:18

Nikola K.

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answered Mar 21, 2012 at 7:32

Poly

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Comments

WolfRevoKcats · Accepted Answer · 2010-11-15 05:17:17Z

1

You need a # to tell jQuery that you want to select an id X rather than an element X.

if($('#'+x).attr('checked'))

Or, if you change onClick="msg(this.id)" to onClick="msg(this)" you can use:

if($(x).attr('checked'))

answered Nov 15, 2010 at 5:17

WolfRevoKcats

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