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Got a server that can run PHP There are plenty on the Internet, and you can download PHP to your own computer if you want, as discussed in 9 If you can execute PHP in a server, give ajax2html a try To do that, put ajax2html and dataphp into the same directory (changing the protection of dataphp so that it can be executed on your server, if needed), and navigate to ajax2html in your browser Hopefully, you ll see the page shown in Figures 3-4 and 3-5 We re not going to use PHP in depth until 9, because we ll be working on the various skills involved in Ajax until then But if you want to work with Ajax, it s important to be able to perform server-side programming and the most common combination is Ajax and PHP
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Okay, now we ve been successful in reading text from dataphp, which is fun but in time, it s going to get boring, because that text never changes How about actually interacting with the server by sending data to it In the next two sections, we are going to look at two means of communicating with the server, the HTTP GET method and the HTTP POST method, starting with the former
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Communicating with the server is at the heart of what Ajax does, and in order to make the server respond to what you ve sent it, you need to be able to use some form of programming on the server In this section, we ll create a PHP script named dataresponderphp that you can send data to
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3:
Creating Ajax Applications
If you send dataresponderphp a value of 1, it will send back the text The server got a value of 1, and if you send a value of 2, the script will send back the text The server got a value of 2
Sending Data with URL Encoding
The GET method lets you send text data to the server by appending that text to the end of the URL you use to access the server For example, if you want to send the name Steve to the server, you pass Steve as the value of an argument, just as with a JavaScript function We might name that argument name, and here is how you d assign Steve to the argument name and send everything to the server using the HTTP GET method (note that you use a question mark to separate your data from the navigation part of the URL):
http://wwwservercom/scriptphp name=Steve
On the server, your PHP script can ask to get the value corresponding to the name argument, and it ll be passed the value Steve What if you want to pass two or more data items to the server You separate the data you want to pass into argument/value pairs (that is, as argument=value ) and separate those pairs with an ampersand, & Here s an example:
http://wwwservercom/scriptphp firstname=Steve&lastname=Holzner
What if the data you want to send includes spaces You can t include spaces in a URL Instead, you replace the spaces with plus signs (+) Here s an example:
http://wwwservercom/scriptphp name=Steve+Holzner
Adding data to a URL like this is called URL encoding, and it lets you send your data to the server (as long as that data is text) However, note that the text you send is part of the (very public) URL you re accessing, so privacy is nonexistent with the GET method The POST method, which encodes the data you re sending in the HTTP headers in the request sent to the server, does a better job of keeping things private (as discussed in Sending Data to the Server Using POST later in the chapter) So this means that we can send a value of 1 to the dataresponderphp script like this, where we re naming the argument sent to the server data, and assigning data a value of 1:
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