:blank Selector

blank selector

Description: Selects all elements with a blank value.

  • jQuery( “:blank” )

Blank means either no value at all or only whitespace.

The implementation does a check like this: jQuery.trim(value).length == 0

Example:

Finds input elements with no value or just whitespace.

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Finds input elements with no value or just whitespace.</title>
<link rel="stylesheet" href="http://jquery.bassistance.de/validate/demo/site-demos.css">
</head>
<body>
<form id="myform">
<div>Mouseover to see the value of each input</div>
<input value="" title='""'>
<input value=" " title='" "'>
<input value="abc" title='"abc"'>
</form>
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="http://jquery.bassistance.de/validate/jquery.validate.js"></script>
<script src="http://jquery.bassistance.de/validate/additional-methods.js"></script>
<script>
// just for the demos, avoids form submit
jQuery.validator.setDefaults({
debug: true,
success: "valid"
});
$( "input:blank" ).css( "background-color", "#bbbbff" );
</script>
</body>
</html>

Demo: