: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="https://jqueryvalidation.org/files/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="https://code.jquery.com/jquery-1.11.1.min.js"></script>

<script src="https://cdn.jsdelivr.net/jquery.validation/1.16.0/jquery.validate.min.js"></script>

<script src="https://cdn.jsdelivr.net/jquery.validation/1.16.0/additional-methods.min.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: