Has anyone got any experience with overriding the alert() function in JavaScript?   Which browsers support this? Which browser-versions support this? What are the dangers in overriding the function?...

Let's say you have the below code:  function A() {     function modify() {        x = 300;        y = 400;     }      var c = new C(); }  function B() {     function modify(){        x = 3000;        y = 4000;     }      var c = new C(); }  C = f...

How would I be able to override the XMLHttpRequest.open() method and then catch and alter it's arguments?  I've already tried the proxy method but it didn't work, although removing the open over-rid when XMLHttpRequest() was called:   (fu...

How can I go about making a child class override a privileged method of a base class?  If its not possible, is there another way to achieve what I am trying to accomplish in the simple code example below?  I cannot convert the baseclass function pars...

For example:  (function() {       var proxied = window.eval;       window.eval = function() {         return proxied.apply(this, arguments);       };     })();   But this code is not working....

Can I do something like?:  function User(form) {     this._username = form.username.value;     this._password = form.password.value;     this._surname = form.surname.value;     this._lastname = form.lastname.value;     this._birthdate = form.b_day.va...

If a javascript function is declared anonymously is there any way to override it or portions of it?  I am attempting to stop google.com's instant search from hijacking the up and down arrow keys to move through your search rankings. I have identi...

The simple code below describes my question (at least I hopse so):  $.widget("ui.mydialog", $.ui.dialog, {   _create: function() {     // How to call _create method of dialog?   } });   I tried to call $.ui.dialog.prototype._create() from wit...

Lets say we have alert method of window object. I would like to enhance it with nice alertbox.  Also I want to save the existing alert method so that we can switch back once our application is over.  Something like this, but its throwing error in fir...

Is it possible to override a function based on the number of parameters that you are passing into it?  For instance:  function abc(name) {     document.write ('My name is' + name); }  function abc(name,friend) {     document.write ('My na...