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POReusing my AJAX post function by using CallBacks
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  1. POReusing my AJAX post function by using CallBacks
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    copied!<p>I have an AJAX post function I am using for my communication between my server &amp; the users webpage. But I have a problem with dealing with the response from the server in my resuable function.</p> <p>If you see the following example you will see that the function outputEmailDetailsResult() is called &amp; run on the line "post( "forgotPass.py", emailParam, outputEmailDetailsResult() );", ie, when the function is passed as a param. But it should only run inside the post function in reation to the server response:</p> <pre><code>var xmlhttp; function post( dest, params, callbackFunction ) { if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange = function() { if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200) { callbackFunction; } } xmlhttp.open("POST",dest,true); xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded"); xmlhttp.send( params ); // "fname=Henry&amp;lname=Ford"); } function emailLoginDetails() { var emailParam = "email=sam"; // + document.getElementById( "forgotEmail" ).innerText; alert( emailParam ); post( "forgotPass.py", emailParam, outputEmailDetailsResult() ); } function outputEmailDetailsResult() { try { document.getElementById( "statusOutput" ).value = xmlhttp.responseText; } catch ( ex ) { document.getElementById( "statusOutput" ).value = "Failed to get response from server"; } } </code></pre> <p>I am new to passing functions as a parameters(I think they're called callbacks?) &amp; I am unsure I am doing it correctly?</p>
 

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