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As you saw when you built googlehtml, accessing a web server other than the one your web page is hosted on is a little tricky with Ajax Say your Ajax page is at wwwmyservercom/ hamster_fanhtml, but you want to download the page at wwwtheirservercom/hamster_data html that is, on a different server You can access that page directly in Ajax from your current page, but the browser is going to display a warning dialog box to the user, asking their permission to proceed Not the most ultra-cool thing that can happen The common solution is to communicate with the other server (wwwtheirservercom) via server-side code, and you saw an example of that in googlephp With googlephp, we were able to relay our request to Google Suggest, and then download Google Suggest s response Here s a general PHP script that lets you redirect Ajax requests in this way replace URL with the URL of the web resource you want to reach:
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< php $filehandle = fopen(URL, "r"); while (!feof($filehandle)){ $download = fgets($filehandle); echo $download; } fclose($filehandle); >
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After you get googlehtml and googlephp to work, try the same technique with another server For example, you might download and display the HTML of the USA Today site, www usatodaycom Here s how that would work in a PHP script:
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< php $filehandle = fopen("wwwusatodaycom", "r"); while (!feof($filehandle)){ $download = fgets($filehandle); echo $download; } fclose($filehandle); >
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If you like, you can even change googlephp to download from wwwusatodaycom and use googlehtml as it stands to connect and display the HTML of USA Today s site Now it s time to turn to another topic requesting HTML header info with Ajax
Ajax: A Beginner s Guide
Getting More Info: HTML Header Requests and Ajax
You not only can download the contents of files with Ajax, you can get information about those files To do that, you can use the XMLHttpRequest object s getAllResponseHeaders method, which gives you the text corresponding to all the HTML headers received about the file from the server HTTP headers are given names like Server, Date, and so on, and are assigned text about the resource you re accessing You can use this kind of information before you even try to download a web resource, to find out about that resource s size, type, last-modified date, and so on, which allows you to better prepare for the download And if the user asks you to download a resource that doesn t exist, you can let them know without having your application suffer some kind of error when needed data doesn t show up Let s give this a try and see what kind of HTTP headers we can download for the googlehtml file Here s headhtml, which just uses the XMLHttpRequest object s getAllResponseHeaders method to get all the HTTP headers available from the server about googlehtml We start by using the HEAD method in the call to the open function, as opposed to GET or POST :
<html> <head> <title>Getting head data</title> <script language = "javascript"> function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { var obj = documentgetElementById(divID); XMLHttpRequestObjectopen("HEAD", dataSource);
Then we use getAllResponseHeaders to read all the HTTP headers:
<html> <head> <title>Getting head data</title> <script language = "javascript"> function getData(dataSource, divID)
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{ var XMLHttpRequestObject = false;
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if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { var obj = documentgetElementById(divID); XMLHttpRequestObjectopen("HEAD", dataSource); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { objinnerHTML = XMLHttpRequestObjectgetAllResponseHeaders(); } } XMLHttpRequestObjectsend(null); } } </script> </head> <body> <H1>Getting header data</H1> <form> <input type = "button" value = "Get info on googlehtml" onclick = "getData('googlehtml', 'targetDiv')"> </form> <div id="targetDiv"> <p>The fetched data will go here</p> </div> </body> </html>
You can see headhtml at work in Figure 4-9, where the user has clicked the button and the application fetched information about googlehtml Here s the data the application got:
Server: Microsoft-IIS/51 Date: Fri, 22 Feb 2008 17:15:09 GMT Content-Type: text/html Accept-Ranges: bytes Last-Modified: Thu, 21 Feb 2008 18:26:23 GMT ETag: "82283a43b774c81:a57" Content-Length: 2304
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