Wednesday, May 25, 2011

JavaScript - AJAX / SJAX - Submit Form Data to PHP Script

Below is a function I use to submit form data (POST) to a PHP script using Asynchronous / Synchronous JavaScript And XML.

function runSQL(div, script, data) {
ajax = window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest;
  if (div != "") {
    ajax.onreadystatechange = function () {
     if (ajax.readyState == 4) {document.getElementById(div).innerHTML = ajax.responseText}; //AJAX
  }"POST", script, div != '' ? true : false);
  if (data) {ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")};
  ajax.send(data ? data : null);
  if (div == "") {
    return ajax.responseText; //SJAX
  } else {

Example of AJAX call:

runSQL('DIV_Content', 'sql.php', 'action=getContents&page=Home&custom=1');

Example of SJAX call:

result = runSQL('', 'sql.php', 'action=getContents&page=Home&custom=1');
//Do something with result

Note: Using AJAX allows the JavaScript to continue executing however using SJAX forces JavaScript to wait for the result before continuing. This is useful if you need to do something with the result such as use it in a calculation elsewhere in JavaScript whereas the AJAX result can just be returned straight to the HTML div element as is, once it is ready.

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