skins/common/preview.js

   1 // Live preview
   2
   3 function openXMLHttpRequest() {
   4         if( window.XMLHttpRequest ) {
   5                 return new XMLHttpRequest();
   6         } else if( window.ActiveXObject ) {
   7                 return new ActiveXObject("Microsoft.XMLHTTP");
   8         } else {
   9                 return null;
  10         }
  11 }
  12
  13 /**
  14  * Returns true if could open the request,
  15  * false otherwise (eg no browser support).
  16  */
  17 function livePreview(target, text, postUrl) {
  18         prevTarget = target;
  19         if( !target ) {
  20                 window.alert('crash and burn');
  21         }
  22         prevReq = openXMLHttpRequest();
  23         if( !prevReq ) return false;
  24
  25         prevReq.onreadystatechange = updatePreviewText;
  26         prevReq.open("POST", postUrl, true);
  27
  28         var postData = 'wpTextbox1=' + encodeURIComponent(text);
  29         prevReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  30         prevReq.send(postData);
  31         return true;
  32 }
  33
  34 function updatePreviewText() {
  35         if( prevReq.readyState != 4 ) {
  36                 return;
  37         }
  38         if( prevReq.status != 200 ) {
  39                 window.alert('Failed to connect: ' + prevReq.status +
  40                         ' "' + prevReq.statusText + '"');
  41                 return;
  42         }
  43         prevTarget.innerHTML = prevReq.responseText;
  44 }