JQuery prevents page bounce

Sometimes we need to prevent the page with the backspace key from moving back. Generally, it is best not to use this function because it is not good for UX. Below are the Js snippets tested in IE9 and Firebox 10.0.2:
$ (Document). keydown (function (e ){
Var doPrevent;
If (e. keyCode = 8 ){
Var d = e. srcElement | e.tar get;
If (d. tagName. toUpperCase () = 'input' | d. tagName. toUpperCase () = 'textarea '){
DoPrevent = d. readOnly | d. disabled;
}
Else
DoPrevent = true;
}
Else
DoPrevent = false;

If (doPrevent)
E. preventDefault ();
});
 
Code on how to determine the Backspace key can be http://api.jquery.com/event.which/ here
Hope to help your Web development.

Articles you may be interested in:

Use Jquery, CSS3 to implement a circle effect http://www.bkjia.com/kf/201202/121327.html like GooglePlus

From PetterLiu