Bulletproof Ajax by Jeremy Keith

By Jeremy Keith

Step-by-step advisor unearths top practices for reinforcing websites with Ajax

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

Web website designers love the belief of Ajax--of growing websites within which details should be up-to-date with no fresh the total web page. yet in the event 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 pleased with CSS and (X)HTML can construct Ajax performance with out frameworks, utilizing the guidelines of sleek degradation and innovative 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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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. The number is automatically converted to a string, so the result is always a string: var letters = "thx"; var numbers = 1138; var result = letters + numbers; The variable result contains the value "thx1138".

For addition, the operator is the plus sign. For subtraction, it’s the minus sign. The operator for multiplication is the asterisk, and for division it’s the slash. var addition = 5 + 3; var subtraction = 15 - 7; var multiplication = 4 * 2; var division = 24 / 3; Most useful of all, you can carry out operations on variables: var year = 2006; var age = 35; var birth = year - age; Some operations can be specified in shorthand. To decrement a number by one, use two subtraction operators together: var price = 10; price--; The value of price is now 9.

The send method. ONREADYSTATECHANGE Event handlers let you specify what behavior should occur when an event is triggered. Most events are triggered by the user. When a user places her cursor over an element in a Web page, the mouseover event for that element is triggered. The corresponding event handler is onmouseover. When a user submits a form, its submit event is fired. The event handler for this is onsubmit. Event handlers have been crucial to the success of JavaScript on the Web. For years, the most common uses of JavaScript were image rollovers and form validation.

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