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POAjax XMLHttpRequest.responseText working conditionally
 

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    <p>I created an Ajax function purposely to read in inputs from a FORM, create a query string and send it to PHP file, which inserts the data into a database and sends feedback indicating the successful or a failure of the process.</p> <p>The Problem is that the Ajax XMLHttpRequest.responseText dose not function. Which means, the end user dose not get to get the feedback from the php file: if the process was successful or a failure. </p> <p>Strangely I found out that when I put an alert() function at the end of the Ajax function, then the XMLHttpRequest.responseText magically starts working. As you can imagine this is annoying as it creates a popup each time the process is run.</p> <p>Can someone help me understand why this is happening.</p> <p>// FORM</p> <pre><code>class Teacher { function AddATeacher() { ## Template for form with image ## echo "&lt;img src='../images/addaTeacher.png' alt='add A teacher icon' align='middle' width='90' height='90' /&gt;"; echo " &lt;b&gt;&amp;nbsp &amp;nbsp &amp;nbsp &amp;nbsp &amp;nbsp &amp;nbsp &amp;nbsp &amp;nbsp &amp;nbsp &amp;nbsp Add a Teacher &lt;/b&gt; &lt;br&gt; &lt;br&gt;"; ## Template for form with image ## echo "&lt;form name ='login' onsubmit='AddATeachers()' method='post'&gt;"; echo "First Name: &amp;emsp&amp;emsp&amp;emsp&amp;emsp&amp;emsp &lt;input type='text' size='15' maxlength='15' onclick=this.value='' id='teachers_first_name' value='Teachers First Name' /&gt; &lt;br&gt;"; echo "Surname: &amp;emsp&amp;emsp&amp;emsp&amp;emsp&amp;emsp&amp;emsp&lt;input type='text' size='15' maxlength='15' onclick=this.value='' id='teachers_surname' value='Teachers surname' /&gt; &lt;br&gt;"; echo "Number: &amp;emsp&amp;emsp&amp;emsp&amp;emsp&amp;emsp &amp;emsp &lt;input type='text' size='15' maxlength='15' onclick=this.value='' id='teachers_number' value='Teachers number' /&gt; &lt;br&gt;"; echo "Email address: &amp;emsp&amp;emsp&amp;emsp&amp;emsp&lt;input type='text' size='15' maxlength='25' onclick=this.value='' id='teachers_email' value='Email address' /&gt; &lt;br&gt;"; echo "Password: &amp;emsp &amp;emsp &amp;emsp&amp;emsp&amp;emsp &lt;input type='password' size='15'maxlength='25' id='password' value='' /&gt; &lt;br&gt;"; echo "&lt;hr/&gt;"; echo " Sex: &lt;select value= 'Male' id='sex'&gt; &lt;option&gt; &lt;/option&gt; &lt;option&gt;Male&lt;/option&gt; &lt;option&gt;Female&lt;/option&gt; &lt;/select&gt; "; echo " Assigned Class: &lt;select value= 'Choose a class' id='classes'&gt; &lt;option&gt; &lt;/option&gt; &lt;option&gt;P1 East&lt;/option&gt; &lt;option&gt;P1 West&lt;/option&gt; &lt;option&gt;P2 East&lt;/option&gt; &lt;option&gt;P2 West&lt;/option&gt; &lt;option&gt;p3 East&lt;/option&gt; &lt;option&gt;p3 West&lt;/option&gt; &lt;option&gt;p4 East&lt;/option&gt; &lt;option&gt;p4 West&lt;/option&gt; &lt;option&gt;p5 East&lt;/option&gt; &lt;option&gt;p5 West&lt;/option&gt; &lt;option&gt;p6 East&lt;/option&gt; &lt;option&gt;p6 West&lt;/option&gt; &lt;option&gt;p7 East&lt;/option&gt; &lt;option&gt;p7 West&lt;/option&gt; &lt;/select&gt;"; echo" &lt;hr/&gt; &lt;input type='submit' value='Submit' /&gt;&lt;br /&gt;"; echo "&lt;/form&gt;"; } } </code></pre> <p>//AJAX FUNCTION</p> <pre><code>function AddATeachers(){ var ajaxRequest; // The variable that makes Ajax possible! try{ // Opera 8.0+, Firefox, Safari ajaxRequest = new XMLHttpRequest(); } catch (e){ // Internet Explorer Browsers try{ ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try{ ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e){ // Something went wrong alert("Your browser broke!"); return false; } } } // Create a function that will receive data sent from the server ajaxRequest.onreadystatechange = function(){ if(ajaxRequest.readyState == 4){ document.getElementById("Ajax_response").innerHTML = ajaxRequest.responseText; } } //alert ("Above ur variables "); var teachers_first_name = document.getElementById("teachers_first_name").value; //alert ("within ur variables 1111111111 "); var teachers_surname = document.getElementById('teachers_surname').value; var teachers_number = document.getElementById('teachers_number').value; //alert ("within ur variables 222222222 "); var teachers_email = document.getElementById('teachers_email').value; var password = document.getElementById('password').value; //alert ("Email retrieved: " + password + ""); var tClass = document.getElementById('classes').value; var gender = document.getElementById('sex').value; //alert ("Class value: " + tClass + ""); //alert ("Exited ur variables "); //alert ("Just before Query String..."); var queryString = "?tFirstName=" + teachers_first_name + "&amp;tSurname=" + teachers_surname + "&amp;tNumber=" + teachers_number + "&amp;tEmail=" + teachers_email + "&amp;tPwd=" + password + "&amp;tSex=" + gender + "&amp;tClass=" + tClass ; //alert ("After Query String..."); ajaxRequest.open("GET","addATeacherInsert.php" + queryString, true); ajaxRequest.send(null); alert ("Process Complete"); } </code></pre> <p>// addATeacherInsert.php which calls a Class Method/Instance</p> <pre><code>&lt;?php require ("database.php"); require ("teacher.class"); mysql_connect(HOSTNAME, USERNAME, PASSWORD) or die(mysql_error()); //echo "Connected to MySQL&lt;br /&gt; &lt;br /&gt;"; mysql_select_db(DATABASE) or die(mysql_error()); //echo "Connected to Database: " . DATABASE . " &lt;br /&gt;"; $sql = ("SELECT * FROM Teachers_Table WHERE TFirstName='$_GET[tFirstName]' AND TSurName= '$_GET[tSurname]' "); $query = mysql_query($sql); $Sample = new Teacher; $Sample-&gt;AddATeacherInsert(); ?&gt; </code></pre> <p>//METHOD</p> <pre><code>function AddATeacherInsert() { mysql_connect(HOSTNAME, USERNAME, PASSWORD) or die(mysql_error()); //echo "Connected to MySQL&lt;br /&gt; &lt;br /&gt;"; mysql_select_db(DATABASE) or die(mysql_error()); //echo "Connected to Database: " . DATABASE . " &lt;br /&gt;"; ##### Insert into Teachers_Table ###### mysql_query("INSERT INTO Teachers_Table (TFirstName, TSurName, TNumber, TAddress, TPwd, TClassAssig, TSex) VALUES ('$_GET[tFirstName]', '$_GET[tSurname]', '$_GET[tNumber]', '$_GET[tEmail]', '$_GET[tPwd]', '$_GET[tClass]', '$_GET[tSex]') ") or die(mysql_error()); ##### Insert into login_details ###### mysql_query("INSERT INTO login_details (email_address, password) VALUES ('$_GET[tEmail]', '$_GET[tPwd]') ") or die(mysql_error()); echo "&lt;br&gt;"; echo "&lt;center&gt; &lt;img src='../images/approved.png' alt='Enroll student icon' align='bottom' width='90' height='90' /&gt; &lt;/center&gt;"; echo "&lt;br&gt;&lt;center&gt; &lt;b&gt; &lt;font color='blue'&gt;" . $_GET[tFirstName] . " " . $_GET[tSurname] . "&lt;/b&gt; has been successfully enrolled...&lt;/font&gt;&lt;/center&gt;&lt;br /&gt;"; } </code></pre> <p>thank you in advance</p>
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