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Download PDF by Andrew Dupont: Practical Prototype and script.aculo.us (Expert's Voice in

Posted On April 20, 2018 at 12:20 am by / Comments Off on Download PDF by Andrew Dupont: Practical Prototype and script.aculo.us (Expert's Voice in

By Andrew Dupont

ISBN-10: 1590599195

ISBN-13: 9781590599198

Prototype and its sister results library, script.aculo.us, are of the preferred JavaScript libraries/frameworks on hand – they're accessories to JavaScript, which provide JavaScript builders prebuilt performance to play with, and accelerate improvement time. And now Apress has collaborated with Andrew Dupont, one of many Prototype center improvement group individuals, to create functional Prototype and script.aculo.us. This e-book is a necessary consultant for any JavaScript developer desirous to study each significant aspect of Prototype/script.aculo.us speedy and successfully. This ebook will disguise the wet contemporary releases of Prototype and script.aculo.us.

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Additional info for Practical Prototype and script.aculo.us (Expert's Voice in Web Development)

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Using Enumerable#detect Enumerable#detect finds and returns one item in your collection. It takes a function as an argument (one that returns true or false) and will return the first item in the collection that causes the function to return true. detect(isEven); //-> 2 If there are no matches, detect will return false. 35 36 CHAPTER 3 ■ COLLECTIONS (OR, NEVER WRITE A FOR LOOP AGAIN) Using Enumerable#select What if we need to find several needles in a haystack? select(isEven); //-> [2, 4, 6, 8, 10] Just like detect, select tests each item against the given function.

It creates a $break object that can be thrown within loops to exit immediately. include('weblog')) { weblogElement = element; throw $break; } }); In this example, we “throw” the $break object as though it were an exception. It interrupts the execution of the function and gets “caught” higher in the call stack, at which point the each method stops iterating and moves on. Now we’re even. It’s rare that you’ll need to use $break—most of the use cases for breaking out of loops are addressed by other Enumerable methods—but it’s comforting to know it’s there.

In addition, the dollar sign is a valid character in object names and has little chance of having the same name as another function on the page. It’s far more than a simple alias, though. getElementById. CHAPTER 2 ■ PROTOTYPE BASICS $ Can Take Either Strings or Nodes If the argument passed to $ is a string, it will look for an element in the document whose ID matches the string. If it’s passed an existing node reference, though, it will return that same node. In other words, $ lets you deal with string ID pointers and DOM node references nearly identically.

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Practical Prototype and script.aculo.us (Expert's Voice in Web Development) by Andrew Dupont

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