Greasemonkey Hacks: Tips & Tools for Remixing the Web with by Mark Pilgrim

By Mark Pilgrim

Publish yr note: First released November fifteenth 2005
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Greasemonkey Hacks is a useful compendium a hundred creative hacks for strength clients who are looking to grasp Greasemonkey, the recent new Firefox extension in an effort to write scripts that modify the internet pages you stopover at. With Greasemonkey, you could create scripts that make an internet site extra usable, repair rendering insects that webmasters can't be troubled to mend themselves, or upload goods to an online site's menu bar. you could regulate pages so that they paintings greater with applied sciences that talk an internet web page out loud or convert it to Braille. Greasemonkey authorities may import, mix, and change facts from assorted websites to fulfill their very own particular needs.

Greasemonkey has completed a cult-like following in its brief lifespan, yet its makes use of are only starting to be explored. Let's say you're buying on an e-commerce website. you could create a script that might instantly show aggressive costs for that individual product from different sites. the chances are restricted purely by means of your mind's eye and your Greasemonkey services. Greasemonkey Hacks can't assist you with the mind's eye half, however it promises the professional hacks-complete with the pattern code-you have to flip your brainstorms into reality.

greater than simply an important number of made-to-order Greasemonkey options, Greasemonkey Hacks is filled with pattern code, a Greasemonkey API reference, and a complete record of assets, to make sure that each source you wish is obtainable among its covers.

a few everyone is content material to obtain details from web pages passively; a few humans are looking to regulate it. while you're one of many latter, Greasemonkey Hacks offers the entire shrewdpermanent customizations and state-of-the-art information and instruments you must take command of any website you view.

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Submitting the form will be trapped in the private _save() method. Saving Last piece of the editing puzzle is saving the content changes after the person is done typing and they have submitted the form (via the Enter button). preventDefault(); // ... info Conclusion and virtual DOM diffs At this point the editing feature is complete. It didn’t take too much code. edit • render an input field when displaying the table if the row and cell indices match the cell the person double-clicked • update the data array with the new value from the input field As soon as you setState() with the new data, React calls the component’s render() method and the UI magically updates.

Mounting and updating two components You can see how the child component is mounted and updated before the parent. Figure 2-14 shows what happens after you delete the text in the textarea and count becomes 0. In this case the Counter child becomes null and its DOM node is removed from the DOM tree, after notifying you via the componentWillUnmount callback. info Figure 2-14. Unmounting the counter component Performance win: prevent component updates The last lifecycle method you should know about, especially when when building per‐ formance critical parts of your app, is the method shouldComponentUpdate(next Props, nextState).

_log('componentWillUnmount', arguments);}, arguments);}, arguments);}, arguments);}, arguments);}, // ... // more implementation, render() etc.... }; Figure Figure 2-10 shows what happens after you load the page. Figure 2-10. Mounting the component As you see, two methods were called without any arguments. The method component DidMount() is usually the more interesting of the two. getDOMNode() if you need, for example, to get the dimensions of the component. You can also do any sort of initialization work for your component now that your component is alive.

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