Building a Web Site with Ajax: Visual QuickProject Guide by Larry Ullman

By Larry Ullman

Ajax is on the center of the internet 2.0 revolution. it's not a expertise yet, particularly, is a method that leverages different applied sciences and strategies, equivalent to CSS, XML, DHTML, and XHTML. Many net designers and programmers want to comprise Ajax of their tasks due to the remarkable performance it may well upload to a website, yet they cannot as a result of the steep studying curve. that is the place this booklet steps in. It makes studying Ajax enjoyable and simple -- an excellent spot to begin! visible QuickProject courses specialize in a unmarried undertaking. to that end the undertaking is making a company worker listing, like an tackle e-book. what is being created is a greater, new form of site.

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36 • Once again, the Document Object Model allows you to easily access individual elements in a page. The code document. 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.

In the previous two chapters, we developed an Ajax as well as a non-Ajax approach for browsing the employees by department. In this chapter, let’s create a way to add employees to the database. Naturally we’ll start with the non-Ajax version, for universal accessiblity, and then add the Ajax-enabled version in the next chapter. To begin, we’ll start by creating the HTML form that takes all the requisite data. Then we’ll write the PHP script that handles the form submission in a non-Ajax way. This will all be fairly basic PHP form handling.

XMLHTTP”); } catch (e) { } } } return ajax; } 2 Older versions of Internet Explorer (that have ActiveX enabled) should get an XMLHttpRequest object from one of these two lines. 3 Finally, this function returns the ajax variable. js and place it in the same directory on your Web server as every other file. js file defines a function that creates an XMLHttpRequest object, but it doesn’t actually use that object. Another JavaScript file will do that for each specific instance, like the HTML form already created.

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