Download AdvancED DOM scripting : dynamic web design techniques by Jeffrey Sambells PDF

By Jeffrey Sambells

DOM Scripting is a crucial procedure for net builders and architects to benefit and grasp which will upload such dynamic net functions as animations, maps, drag and drop, and extra. This ebook deals finished insurance of complex DOM Scripting innovations and reads like a want record of should have dynamic internet software positive factors, together with visible results utilizing JavaScript libraries, Ajax, Mashups utilizing APIs, and lots more and plenty extra. It follows within the footsteps of

Jeremy Keith's acclaimed e-book, DOM Scripting (friends of ED: 1590595335, 2005), aiding you grasp the subsequent point with numerous genuine global tutorials.

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Proper inclusion and capability detection will go a long way to help your site handle the widest possible assortment of browsers and versions, but what if there is no JavaScript at all? Earlier, I stated that your scripts should enhance, not provide, behavior and interaction. This is important to remember as you have to account for those people or programs that will be accessing your site and don’t have JavaScript or have only limited or partial JavaScript. Yes, it’s true; there are people who don’t have JavaScript.

In those instances, you’ll be forced to use browser sniffing, as it’s the only way to detect product-specific differences with the same object. How you go about detecting which browser is which will depend on the product feature you’re testing for. We’ll look at this more in Chapter 7, where browser product features will begin to conflict and you’ll have to come up with some creative solutions to get around them. Degrade gracefully for guaranteed accessibility The first rule when writing DOM scripts is that you can’t rely on the availability of JavaScript.

Use capability detection Capability detection, often call object detection, refers to checking the existence of a script object or method before executing code, rather than relying on your knowledge of which browsers have which features. If the required object or method exists, the browser is capable of using it and will execute as expected regardless of the version or signature of the browser. ' ); } Now, when Bobby (who can throw a fastball) comes along, the code will still work, because you’re not checking for his name; you’re just checking if he can actually throw a fastball.

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