AJAX: A Beginner's Guide (Beginner's Guide (Osborne Mcgraw by Steven Holzner

By Steven Holzner

Essential Skills--Made Easy!

Learn how you can use Ajax (Asynchronous JavaScript and XML) to create internet functions that replicate the richness of laptop purposes. utilizing easy-to-follow examples, Ajax: A Beginner's Guide will get you set to work with this state of the art number of applied sciences very quickly. Create XMLHttpRequest items and use JavaScript, XML, DHTML, CSS, personal home page, and extra to construct next-generation net functions. you are going to additionally learn about a number of unfastened, pre-written Ajax frameworks you should use instantly.

Designed for simple studying:

  • Key abilities & Concepts--Lists of particular abilities coated within the bankruptcy
  • Ask the Expert--Q&A sections jam-packed with bonus info and worthwhile guidance
  • Try This--Hands-on workouts that convey easy methods to observe your skills
  • Annotated Syntax--Example code with observation that describes the programming innovations being illustrated

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Extra resources for AJAX: A Beginner's Guide (Beginner's Guide (Osborne Mcgraw Hill))

Example text

There are thousands and thousands of Ajax applications available, and by now you can see some of the potential. For example, imagine an online shopping site where you don’t have to go through four or five flickering screens to add something to your shopping cart—you just drag the item to a shopping cart icon and, behind the scenes, Ajax informs the server of your purchase. All this and more is coming up in this book. Turn now to Chapter 2, where you get JavaScript—the foundation of Ajax—under your belt.

You can also subtract values with the subtraction operator, –: var value = operand1 + operand2; Or multiply values with the * operator: var value = operand1 * operand2; Or divide values with the division operator, /: var value = operand1 / operand2; There are many such operators already built into JavaScript. The whole list is provided in Table 2-1. Operator Description Arithmetic Operators + Adds two numbers. ++ Increments the value in a variable by one. – Subtracts one number from another. Also can change the sign of its operand like this: –variableName.

Onmouseup a mouse button goes up. onreset the user clicks a Reset button. onresize an element or page is resized. onsubmit the user clicks a Submit button. onunload a page is unloaded. To handle these events, you use attributes of the same name in HTML tags. html, that makes this more clear. ')">

Click this page!

Go ahead... What’s happening here is that we’re using the onmousedown event of the element (which represents the whole web page) to respond to mouse down events (that is, the mouse button was pressed).

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