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Errors That Developers Make With Ajax
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Errors That Developers Make With Ajax
http://www.ajaxwith.com/Errors-That-Developers-Make-With-Ajax.html
While Ajax has been the subject of hype for its ability to make web applications much more interactive, with power comes responsibility, and Ajax can be dangerous in the hands of developers who do not know how to use it properly. While Ajax has a great deal of potential, it is far from being perfect. There are a number of UI problems that can occur with Ajax applications, and some of these problems are server sided in nature. There are a lot of mistakes that developers can make when using Ajax, and it is important for you to avoid them. One of the most common mistakes that developers make is using Ajax just because it is one of the hottest tools available on the web.
Ajax > Tips and Tutorials
May 12, 2007
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Other links at Ajax > Tips and Tutorials
You've probably seen the CAPTCHA technique used to prevent automatic form submission by spambots and other nuisances.
These operate by displaying an image containing a random string. These strings are very hard for computer programs to read, but straightforward for humans. The user must then enter the displayed string correctly in a form field in order to submit the form.
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In this little project we do just that. Our form contains an image generated on-the-fly by a PHP routine using PHP's inbuilt GD graphics library.
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These operate by displaying an image containing a random string. These strings are very hard for computer programs to read, but straightforward for humans. The user must then enter the displayed string correctly in a form field in order to submit the form.
In many cases, the comparison of the two strings (displayed and entered) is carried out AFTER form submission. It would be nicer if it could be carried out BEFORE submission, using Ajax, as part of the normal form validation.
In this little project we do just that. Our form contains an image generated on-the-fly by a PHP routine using PHP's inbuilt GD graphics library.
Before reading through this tutorial, you'll need a little knowledge about the general architecture of Ajax applications. All the required information is in the pages of this site.
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