By Trevor Burnham
The suggestions within the booklet are illustrated with runnable examples drawn from either the browser and the Node.js server framework, incorporating complementary libraries together with jQuery, Backbone.js, and Async.js.
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IPad app improvement is scorching, with greater than 140,000 apps on hand particularly for the gadget and that quantity transforming into each day. The advent of iOS five and iCloud offers builders much more recommendations to create outstanding iPad apps. This quick and pleasant advisor to iPad app improvement is totally up-to-date for the newest improvements and covers every little thing you must understand, beginning with the right way to obtain the SDK and develop into an Apple developer all of the strategy to polishing off your app and filing it to the App shop.
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Worse, if events are emitted from event handlers, they can easily create an infinite cycle. trigger('click'); }); // stack overflow! Think back to the word processor example at the start of this chapter. When a user presses a key, many things need to happen, and several of them require complex calculations. Doing them all before returning to the event queue would be a recipe for an unresponsive app. A good solution to this problem is to maintain a queue of things that don’t need to happen right away and use a timed function to run the next task in the queue periodically.
Models can’t emit a change event during one of its own change events. The second safeguard presents gotchas of its own. Suppose a change is made to a model that results in a second change to the same model. Because the second change is “nested” in the first one, it’ll occur silently. Observers won’t have a chance to respond to it. Clearly, maintaining two-way data bindings in Backbone is a challenge. js, takes a different approach: two-way bindings are declared explicitly. When one value changes, the other is updated asynchronously from a timeout event.
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