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targetinnerHTML = thisresponseText
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documentgetElementById('info')innerHTML = thisresponseText
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Therefore the text within the two following <div> tags would be replaced with the new text from the Ajax call:
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<div id='info'>The contents of this DIV will be replaced</div>
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If the value of thisresponseText is null, an alert message appears, as also happens if thisstatus doesn t have the value 200 These alert commands are useful while you are debugging code but you may want to remove them when using this plug-in on a production server After assigning the function to requestonreadystatechange, requestopen() is called and passed three parameters: "POST", for a POST request; the URL to access in url; and the value true, indicating that the request should take place asynchronously Next, three headers have to be sent to the server These are to tell the server to expect URL encoded form data, to pass the length of the data the server should expect to receive, and to then close the header connection Finally, the Ajax request is initiated using a call to requestsend() with an argument of params
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The following example shows how you would use this function To help you see what is going on I have included both the Ajax Request and the Post Ajax Request plug-ins within the example, which is totally complete except for the PHP component (which comes afterwards):
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<html><head><title>AJAX POST Example</title> </head><body><center /> <h1>Loading a page in DIV tags</h1> <div id='info'>The contents of this DIV will be replaced</div> <script type="text/javascript">
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Incorporating JavaScript
PIPHP_JS_PostAjaxRequest('ajaxpostphp', 'url=http://mfacebookcom/', documentgetElementById('info')) function PIPHP_JS_PostAjaxRequest(url, params, target) { request = new PIPHP_JS_AjaxRequest() requestonreadystatechange = function() { if (thisreadyState == 4) if (thisstatus == 200) if (thisresponseText != null) targetinnerHTML = thisresponseText // You can remove these two alerts after debugging else alert("Ajax error: No data received") else alert( "Ajax error: " + thisstatusText) } requestopen("POST", url, true) requestsetRequestHeader("Content-type", "application/x-www-form-urlencoded") requestsetRequestHeader("Content-length", paramslength) requestsetRequestHeader("Connection", "close") requestsend(params) } function PIPHP_JS_AjaxRequest() { try { var request = new XMLHttpRequest() } catch(e1) { try { request = new ActiveXObject("Msxml2XMLHTTP") } catch(e2) { try { request = new ActiveXObject("MicrosoftXMLHTTP") } catch(e3) { request = false } } } return request } </script>
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Note that the entire Facebook page is being loaded into the <div>, in the same way as if you had included it within an <iframe> element This is purely an example of how to incorporate such a page, and you do not gain access to the Facebook API using this method Instead a surfer using such an embedded page to log in will be directed straight to the Facebook servers for the remainder of the process To try this example for yourself, type it in and save it as ajaxposthtml You can also download it from the Download link at wwwpluginphpcom After extracting the file plug-ins zip, you will find the example in the location 11/ajaxposthtml However, don t run the file until you also have the PHP part of the equation on the server It s not a large program but it s very important because it s the part of the process that receives requests from the browser and responds to them In this case, it returns a requested web page:
< php // ajaxpostphp if (isset($_POST['url'])) echo file_get_contents($_POST['url']); >
What this program does is check whether the variable url has been posted to it, and if so, it loads the page pointed to by the value of url into memory using the function file_get_ contents() It then uses the echo command to return the URL to the calling program in this case, the Ajax call made by the browser This file should be typed in and saved as ajaxpost php, or you can find it in the same folder as the ajaxposthtml program if you download it from the companion web site Of course, your PHP programs are likely to be far more complex than this one, and may return all manner of items to the browser, such as information on available usernames when signing up to a site, or new messages on a social networking site, and so on
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