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Chapter 5 HTML Forms<br />
Disable/enable form elements<br />
Using <strong>jQuery</strong>, you can easily disable form elements by setting the disabled attribute value of a<br />
form element to disabled. To do this, we simply select an input, and then using the attr()<br />
method, we set the disabled attribute of the input to a value of disabled.<br />
Sample: sample51.html<br />
<br />
<br />
<br />
<br />
<br />
(function ($) {<br />
$('#button')<br />
.attr('disabled', 'disabled');<br />
})(<strong>jQuery</strong>); <br />
<br />
<br />
To enable a disabled form element, we simply remove the disabled attribute using<br />
removeAttr() or set the disabled attribute value to be empty using attr().<br />
Sample: sample52.html<br />
<br />
<br />
<br />
<br />
<br />
(function($){ $('#button').removeAttr('disabled');<br />
// or<br />
// $('#button').attr('disabled', '');<br />
})(<strong>jQuery</strong>); <br />
<br />
<br />
How to determine if a form element is disabled or enabled<br />
Using the <strong>jQuery</strong> form filter expressions :disabled or :enabled, it is rather easy to select and<br />
determine (Boolean value) if a form element is disabled or enabled. Examine the code below for<br />
clarification.<br />
54
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