YUI anywhere (bookmarklet)

June 8th, 2007. Tagged: bookmarklets, JavaScript, yui

Hooked on YUI? You can now take it anywhere you go. The thing is Yahoo hosts the libraries publicly, so they are available at any time. Let's say you visit a page and you want to do something with it. Comes the YUI bookmaklet that adds a new script tag to the page pointing to utilities.js that contains all YUI utilities (DOM, Event, DragDrop, Animation, Connection...). Then just open your Firebug console and start messing with the page. The powerful toolset that YUI is, is at your disposal.

The code

The code for the bookmarklet is really simple, just a question of adding a new script tag.

(function(){
    var s = document.createElement('script');
    s.src='http://yui.yahooapis.com/2.2.2/build/utilities/utilities.js';
    document.getElementsByTagName('head')[0].appendChild(s);
})()

Install

Right-click, add to favorites, or drag to bookmarks.

YUI anywhere

Let the fun begin

So you go to any page, click the bookmarklet and for example decide to make the logo on the page draggable. All you need to write in your JS console (or in address bar for IE) is:

new YAHOO.util.DD('logo')

The result is really not bad for a one-liner. But why stop there? Let's make everything on a page draggable.

var all = document.getElementsByTagName('*');for(var i = 0; i < all.length; i++) {new YAHOO.util.DD(all[i])}

Whoa! We can mess up with other people's pages like we've never messed up with other people's pages before! Example:

google-yui-drag.png

And why only other people's pages, what about ours? Imagine you're sitting with a client or boss, showing the new site and they go:
- Hmm, well, you know, I don't know about this spacing between the images here ...
And you:
- Hold that thought (clicking bookmarklet, making everything draggable, dragging the offending image). Is this how you prefer it?
Client:
- Well, maybe, or actually it was better before.
You:
- Ah, OK, whatever suits your business needs

Update: Some more one-liners to prevent loading a new page when you attempt to drag a link or a submit button.

Disable links:
YAHOO.util.Event.addListener(window, 'click', function(e){ if (e.target.nodeName.toUpperCase() == 'A'){ YAHOO.util.Event.preventDefault(e) } });

Prompt before unload:
YAHOO.util.Event.addListener(window,'beforeunload',function(e){ e.returnValue = "Sure?" });

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