js/ajax_wrapper.js

   1 var url = "http://localhost/~mir/test.php?name=";
   2 var output = new Array();
   3 var httpRequest;
   4 var fields = new Object();
   5
   6 /**
   7 * Get the XMLHttpRequest Object
   8 * \return XMLHttpRequst, or <i>false</i> if fail
   9 */
  10 function getXMLHttpRequest() {
  11     if (window.XMLHttpRequest) { // Mozilla, Safari, ...
  12         httpRequest = new XMLHttpRequest();
  13         if (httpRequest.overrideMimeType) {
  14             httpRequest.overrideMimeType('text/xml');
  15         }
  16     }
  17     else if (window.ActiveXObject) { // IE
  18         try {
  19             httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
  20         }
  21         catch (e) {
  22             try {
  23                 httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
  24             }
  25             catch (e) {}
  26         }
  27     }
  28         if (!httpRequest) {
  29         alert('Giving up :( Cannot create an XMLHTTP instance');
  30         return false;
  31     }
  32         return true;
  33 }
  34
  35 function handleHttpResponse(response, xml) {
  36         if (xml == true) {
  37                 var text = response.getElementsByTagName('param')[0].firstChild.data
  38                 text = text + " : " + response.getElementsByTagName('greeting')[0].firstChild.data
  39                 document.getElementById("textarea").value = text
  40         }
  41         else {
  42                 document.getElementById("textarea").value = response.value
  43         }
  44 }
  45
  46 function setField(field, value) {
  47         fields[field] = value
  48 }
  49
  50 function getContactByName(name) {
  51         if (httpRequest == null) {
  52                 alert("Could not initiate AJAX Session")
  53                 return null
  54         }
  55         httpRequest.onreadystatechange = function() {
  56         if (httpRequest.readyState == 4) {
  57                         if (httpRequest.status == 200)
  58                                 handleHttpResponse(httpRequest.responseXML, true)
  59                 }
  60         }
  61         httpRequest.open("GET", url + name, true)
  62         httpRequest.send(null)
  63 }
  64
  65 function handleEvent(field) {
  66         try {
  67                 var f = fields[field]
  68                 if (f == "search_name") {
  69                         var name = document.getElementById(f).value
  70                         getContactByName(name)
  71                 }
  72         }
  73         catch (e) {
  74                 return false
  75         }
  76 }
  77
  78 if (!getXMLHttpRequest()) {
  79         document.location = 'error.html';
  80 }
  81 window.onload = setField("name", "search_name");
  82
  83