Bulletproof Ajax by Jeremy Keith

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By Jeremy Keith

Step-by-step advisor finds top practices for reinforcing sites with Ajax

  • A step by step consultant to improving websites with Ajax.
  • Uses revolutionary enhancement recommendations to make sure swish degradation (which makes websites usable in all browsers).
  • Shows readers the right way to write their very own Ajax scripts rather than counting on third-party libraries.

Web website designers love the belief of Ajax--of developing web content within which info might be up-to-date with out fresh the full web page. yet if you will not be 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 happy with CSS and (X)HTML can construct Ajax performance with no frameworks, utilizing the information of sleek degradation and innovative enhancement to make sure that the pages paintings for all clients. all through this step by step advisor, his emphasis is on top practices with an method of development Ajax pages referred to as Hijax, which improves flexibility and avoids worst-case scenarios.

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As well as accepting values, this function is returning a value at the end using a return statement. A function doesn’t have to return a value, but if it does, you can assign the result of a function to a variable: var days_old = multiply (35, 365); A function is actually a kind of variable. " ); }; JavaScript and the Document Object Model 29 Note that because this is one long assignment statement, it culminates with a semicolon. The function is still executed in the same way: shout(); If you want to refer to a function without executing it, treat it like any other variable and don’t include the parentheses: var annoy = shout; Now the variable annoy is a reference to the function shout.

NextSibling Like previousSibling, the nextSibling property returns a reference to a node that shares the same parent as the current node. Specifically, it provides a reference to the next node in the parent’s childNodes property. nodeValue As you can see, it’s possible to use DOM methods and properties to navigate all around a document from any starting point. But all of these methods and properties only return references to nodes. If you want to retrieve the content of a node, you need to use the nodeValue property.

Suppose I rewrote the shout function to take a single argument, message, which is a string that will be output in the alert statement: function shout(message) { alert ( message ); } Now I want the variable annoy to store a reference to that function with a specific value for the message argument. " ); The shout function will be executed immediately instead of being stored for later use. " ); }; This is called an anonymous function. As you’ll see later on, anonymous functions are very useful for assigning functions to event handlers.

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