Responding to form events

This recipe demonstrates how to respond to events such as focus and blur that are triggered on controls on the web form. The constructs used in this example are as follows:

Construct	Type	Description
$(this)	jQuery object	This refers to the current jQuery object.
.addClass()	jQuery method	This adds the specified CSS class to each matched element.
[attribute!= "value"]	jQuery selector	This selects elements with the specified attribute that is not equal to the value string.
blur	jQuery event	This is fired when an element loses focus. It corresponds to the JavaScript blur event.
.each()	jQuery method	This iterates over the matched elements and executes a function for each element.
focus	jQuery event	This is fired when an element gets focus. It corresponds to the JavaScript focus event.
:input	jQuery selector	This matches the input, button, select, and textarea elements.
.on()	jQuery event binder	This attaches an event handler...