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// Live preview
function openXMLHttpRequest() {
if( window.XMLHttpRequest ) {
return new XMLHttpRequest();
} else if( window.ActiveXObject && navigator.platform != 'MacPPC' ) {
// IE/Mac has an ActiveXObject but it doesn't work.
return new ActiveXObject("Microsoft.XMLHTTP");
} else {
return null;
}
}
/**
* Returns true if could open the request,
* false otherwise (eg no browser support).
*/
function livePreview(target, text, postUrl) {
prevTarget = target;
if( !target ) {
window.alert('Live preview failed!\nTry normal preview.');
var fallback = document.getElementById('wpPreview');
if ( fallback ) { fallback.style.display = 'inline'; }
}
prevReq = openXMLHttpRequest();
if( !prevReq ) return false;
prevReq.onreadystatechange = updatePreviewText;
prevReq.open("POST", postUrl, true);
var postData = 'wpTextbox1=' + encodeURIComponent(text);
prevReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
prevReq.send(postData);
return true;
}
function updatePreviewText() {
if( prevReq.readyState != 4 ) {
return;
}
if( prevReq.status != 200 ) {
window.alert('Failed to connect: ' + prevReq.status +
' "' + prevReq.statusText + '"');
var fallback = document.getElementById('wpPreview');
if ( fallback ) { fallback.style.display = 'inline'; }
return;
}
prevTarget.innerHTML = prevReq.responseText;
/* Hide the active diff if it exists */
var diff = document.getElementById('wikiDiff');
if ( diff ) { diff.style.display = 'none'; }
}
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