Read e-book online Bulletproof Ajax PDF

By Jeremy Keith

ISBN-10: 0321472667

ISBN-13: 9780321472663

Step by step advisor unearths top practices for boosting websites with Ajax
* A step by step advisor to improving sites with Ajax.
* makes use of revolutionary enhancement thoughts to make sure sleek degradation (which makes websites usable in all browsers).
* exhibits readers tips on how to write their very own Ajax scripts rather than counting on third-party libraries.

Web website designers love the assumption of Ajax--of growing websites during which details should be up-to-date with out fresh the total web page. yet if you aren't hard-core programmers, improving pages utilizing Ajax could be a problem. much more of a problem is ensuring these pages paintings for all clients. In Bulletproof Ajax, writer Jeremy Keith demonstrates how builders ok with CSS and (X)HTML can construct Ajax performance with no frameworks, utilizing the tips of sleek degradation and revolutionary enhancement to make sure that the pages paintings for all clients. all through this step by step consultant, his emphasis is on top practices with an method of development Ajax pages known as Hijax, which improves flexibility and avoids worst-case scenarios.

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Additional resources for Bulletproof Ajax

Sample text

Wait a minute… aren’t we supposed to be counting from zero? This is one of the confusing things about arrays. Although indices are assigned beginning with zero, the length is calculated beginning with one. So the length of an array will always be one more than the array’s last index. The fruit array has three members. Its length is 3. The first member is fruit[0], the second member is fruit[1], and the third member is fruit[2]. There is no fruit[3], even though the length of the array is 3. There is another kind of array, called an associative array, or hash.

A local variable is declared within a function. It can’t be accessed outside the function in which it is declared. At first glance, it may seem that global variables are more useful because they can be used everywhere. In practice, global variables cause more problems than they solve. It’s very easy to accidentally change the value of a global variable in an unrelated function. Local variables are much easier to keep track of because they are confined to a function. Ideally, functions should be selfcontained, so it makes sense to use local variables whenever possible.

This is equivalent to writing the following: price = price - 1; To increment a value by one, use two plus signs together: var year = 2006; year++; JavaScript and the Document Object Model 23 The operator for addition, the plus sign, serves a dual role. As well as adding up numbers, it can join strings together: var adjective = "bullet" + "proof"; The variable adjective now contains the string "bulletproof" as its value. Joining strings together like this is called concatenation. As well as concatenating strings, you can concatenate a string with a number.

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Bulletproof Ajax by Jeremy Keith

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