3 function openXMLHttpRequest() {
4 if( window.XMLHttpRequest ) {
5 return new XMLHttpRequest();
6 } else if( window.ActiveXObject && navigator.platform != 'MacPPC' ) {
7 // IE/Mac has an ActiveXObject but it doesn't work.
8 return new ActiveXObject("Microsoft.XMLHTTP");
15 * Returns true if could open the request,
16 * false otherwise (eg no browser support).
18 function livePreview(target, text, postUrl) {
21 window.alert('crash and burn');
23 prevReq = openXMLHttpRequest();
24 if( !prevReq ) return false;
26 prevReq.onreadystatechange = updatePreviewText;
27 prevReq.open("POST", postUrl, true);
29 var postData = 'wpTextbox1=' + encodeURIComponent(text);
30 prevReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
31 prevReq.send(postData);
35 function updatePreviewText() {
36 if( prevReq.readyState != 4 ) {
39 if( prevReq.status != 200 ) {
40 window.alert('Failed to connect: ' + prevReq.status +
41 ' "' + prevReq.statusText + '"');
44 prevTarget.innerHTML = prevReq.responseText;