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Ajax: A Beginner s Guide
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for (loopIndex = 1; loopIndex < arrayTermlength; loopIndex++) { data += "<tr><td>" + "<a href='http://wwwgooglecom/search q=" + arrayTerm[loopIndex] + "'>" + arrayTerm[loopIndex] + '</a></td><td>' + arrayTerm[++loopIndex] + "</td></tr>"; } data += "</table>"; var targetDiv = documentgetElementById("targetDiv"); targetDivinnerHTML = data; } </script> </head> <body> <H1>Handling Google Suggest</H1> Search for <input id = "textField" type = "text" name = "textField" onkeyup = "askGoogleSuggest()"> <div id = "targetDiv"><div></div></div> </body> </html>
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Great, that takes care of googlehtml The last step is to create the PHP script that it communicates with, googlephp
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As you know, googlehtml relies on a PHP script, googlephp, to connect to Google Suggest The googlehtml application connects to Google Suggest in this way to avoid the security issues that are raised when you use Ajax to connect to a server other than the one your page is hosted on So we re going to use googlephp to connect to Google Suggest The URL of Google Suggest is http://wwwgooglecom/complete/search hl=en&js=true&qu= , where you add the partial search term that the user has typed to the end of this URL for example, if the search term is ajax, the URL you access is http://wwwgooglecom/complete/search hl=en&js=tru e&qu=ajax How do you use a PHP script to access a URL like that You ll see more about PHP later in the book, but it turns out that you can treat URLs much as you would treat filenames in PHP, and you can open a URL with the fopen (file open) function, which returns a file
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handle, which you store in a variable (we re not going to make much use of file handles or file handling in PHP in this book, but it s useful for this example) You can then use the file handle to refer to the URL, including reading data from that URL Here s how to open Google Suggest with the partial search string passed to googlephp (you recover the partial search term from the $_GET array and then add that term to the URL with the PHP string concatenation operator, which is a dot, ):
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< php $filehandle = fopen("http://wwwgooglecom/complete/search hl=en&js=true&qu=" $_GET["qu"], "r"); >
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The "r" here indicates that we want to open the Google Suggest URL for reading (as opposed to trying to write to it) Now you re ready to read the suggestions that Google Suggest will pass back to you You can do that in a while loop in PHP, which works just like a while loop in JavaScript In this while loop, we ll be reading from the file handle, and can use the feof (File End of File) PHP function to determine when we re at the end of the file (and the while loop should terminate):
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< php $filehandle = fopen("http://wwwgooglecom/complete/search hl=en&js=true&qu=" $_GET["qu"], "r"); while (!feof($filehandle)){ } >
Note the while loop s condition here !feof($filehandle) What s the ! for It s an operator (in both PHP and JavaScript; see Table 2-1) that reverses the logical sense of an expression So while feof($filehandle) is true when we re at the end of a file, !feof($filehandle) is true while we re not at the end of the file just what we want, to make sure the while loop keeps looping until we reach the end of the file Now googlephp reads individual lines of text from Google Suggest and echoes them back to googlehtml using the PHP fgets (File Get String) and echo functions:
< php $filehandle = fopen("http://wwwgooglecom/complete/search hl=en&js=true&qu=" $_GET["qu"], "r"); while (!feof($filehandle)){
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$download = fgets($filehandle); echo $download; } >
And we re almost done All that s left at the end of googlephp is to close the URL that we ve been reading from, and we can use the PHP fclose (File Close) function to do that in this way:
< php $filehandle = fopen("http://wwwgooglecom/complete/search hl=en&js=true&qu=" $_GET["qu"], "r"); while (!feof($filehandle)){ $download = fgets($filehandle); echo $download; } fclose($filehandle); >
Whew All done This example googlehtml and googlephp is ready to roll This example reads what the user types as they type it, relays what they ve typed to Google Suggest through googlephp, downloads the Google Suggest suggestions, and displays them You can see this example at work in Figure 4-8, where the user has typed a, and the application has downloaded the suggestions Google Suggest made and is displaying them Very cool And that completes googlehtml
Figure 4-8
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