Building a Web site with Ajax by Larry Ullman

By Larry Ullman

Ajax is on the center of the net 2.0 revolution. it is not a expertise yet, particularly, is a method that leverages different applied sciences and strategies, similar to CSS, XML, DHTML, and XHTML. Many net designers and programmers wish to comprise Ajax of their initiatives as a result extraordinary performance it may possibly upload to a website, yet they can not due to the steep studying curve. that is the place this booklet steps in. It makes studying Ajax enjoyable and straightforward -- a great spot to begin! visible QuickProject publications specialise in a unmarried undertaking. subsequently the venture is making a company worker listing, like an deal with ebook. what is being created is a greater, new form of website.

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Browsing using Ajax 31 begin the PHP page A new PHP script will handle the Ajax request. php (which we created in the previous chapter) except that it doesn’t need to print the opening and closing HTML tags. Use any text editing application to make a new PHP document. 1 The page starts by making sure that it receives a valid department ID in the URL. For security purposes, assume we don’t have a valid department ID. 2 If a department ID was passed to this page in the URL, type-cast it (force it to be an integer).

Browsing employees This book’s example contains three facets: browsing employees by department, adding employees, and searching for employees by last name. For each section, we’ll create a non-Ajax version, and then apply the Ajax elements on top. In this chapter, we’ll make a non-Ajax way to browse employees. To do so, we’ll create one HTML page, two PHP scripts, and a CSS style sheet. The non-Ajax pages can act as a model for how the Ajax layer should behave, and more importantly, if anyone accessing this site cannot use the Ajax-enabled pages, the site will still be fully functional for them.

GetElementById(‘results’) refers to a div in the HTML page that has an id of results. css sets the display attrbute of items with an id of results to none. The net effect will be that such elements are not visible when a page is first loaded. This is desired because such items have a solid green border around them and it’d be distracting to see that prior to actually retrieving the results. ) • The process of hiding, then showing the results area using CSS and JavaScript is intended to make it more obvious when the HTML page is updated.

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