By Cristian Darie
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Extra info for AJAX and PHP: Building Responsive Web Applications
Let's now see how to do these steps with real code. info Chapter 2 Creating the XMLHttpRequest Object The XMLHttpRequest is implemented in different ways by the browsers. XMLHttp"); For the other web browsers, XMLHttpRequest is a native object, so you create instances of it like this: xmlhttp = new XMLHttpRequest(); The ActiveX XMLHttp library comes is many more flavors and versions that you could imagine. Each piece of Microsoft software, including Internet Explorer and MDAC, came with new versions of this ActiveX control.
Else echo htmlentities($name) . > The text entered by the user (which is supposed to be the user's name) is sent by the client to the server using a GET parameter. When sending this text back to the client, we use the htmlentities PHP function to replace special characters with their HTML codes (such as &, or >), making sure the message will be safely displayed in the web browser eliminating potential problems and security risks. Formatting the text on the server for the client (instead of doing this directly at the client) is actually a bad practice when writing production code.
And so is a well-written piece of code, we would say. You will get plenty of both, while building the foundations for your future AJAX-enabled applications, in this chapter and the next. Hopefully, the first chapter has developed your interest in AJAX well enough that you will endure a second chapter with lots of theory to be learned. On the other hand, if you found the first exercise too challenging, be assured that this time we will advance a bit slower. We will learn the theory in parts by going through many short examples.