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/**
* Live preview script for MediaWiki
*
* 2007-04-25 – Nikerabbit:
* Worked around text cutoff in mozilla-based browsers
* Support for categories
*/
lpIdPreview = 'wikiPreview';
lpIdCategories = 'catlinks';
lpIdDiff = 'wikiDiff';
/*
* Returns XMLHttpRequest based on browser support or null
*/
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 lpDoPreview(text, postUrl) {
lpRequest = openXMLHttpRequest();
if( !lpRequest ) return false;
lpRequest.onreadystatechange = lpStatusUpdate;
lpRequest.open("POST", postUrl, true);
var postData = 'wpTextbox1=' + encodeURIComponent(text);
lpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
lpRequest.send(postData);
return true;
}
function lpStatusUpdate() {
/* We are at some stage of loading */
if (lpRequest.readyState > 0 && lpRequest.readyState < 4) {
notify(i18n(wgLivepreviewMessageLoading));
}
/* Not loaded yet */
if(lpRequest.readyState != 4) {
return;
}
/* We got response, bug it not what we wanted */
if( lpRequest.status != 200 ) {
var keys = new Array();
keys[0] = lpRequest.status;
keys[1] = lpRequest.statusText;
window.alert(i18n(wgLivepreviewMessageError, keys));
lpShowNormalPreview();
return;
}
/* All good */
dismissNotify(i18n(wgLivepreviewMessageReady), 750);
var XMLObject = lpRequest.responseXML.documentElement;
/* Work around Firefox (Gecko?) limitation where it shows only the first 4096
* bytes of data. Ref: http://www.thescripts.com/forum/thread482760.html
*/
XMLObject.normalize();
var previewElement = XMLObject.getElementsByTagName('preview')[0];
var categoryElement = XMLObject.getElementsByTagName('category')[0];
/* Hide the active diff if it exists */
var diff = document.getElementById(lpIdDiff);
if ( diff ) { diff.style.display = 'none'; }
/* Inject preview */
var previewContainer = document.getElementById( lpIdPreview );
if ( previewContainer && previewElement ) {
previewContainer.innerHTML = previewElement.firstChild.data;
} else {
/* Should never happen */
window.alert(i18n(wgLivepreviewMessageFailed));
lpShowNormalPreview();
return;
}
/* Inject categories */
var categoryContainer = document.getElementById( lpIdCategories );
if ( categoryElement && categoryElement.firstChild ) {
if ( categoryContainer ) {
categoryContainer.innerHTML = categoryElement.firstChild.data;
/* May be hidden */
categoryContainer.style.display = 'block';
} else {
/* Just dump them somewhere */
/* previewContainer.innerHTML += categoryElement.firstChild.data;*/
}
} else {
/* Nothing to show, hide old data */
if ( categoryContainer ) {
categoryContainer.style.display = 'none';
}
}
}
function lpShowNormalPreview() {
var fallback = document.getElementById('wpPreview');
if ( fallback ) { fallback.style.display = 'inline'; }
}
// TODO: move elsewhere
/* Small non-intrusive popup which can be used for example to notify the user
* about completed AJAX action. Supports only one notify at a time.
*/
function notify(message) {
var notifyElement = document.getElementById('mw-js-notify');
if ( !notifyElement ) {
createNotify();
var notifyElement = document.getElementById('mw-js-notify');
}
notifyElement.style.display = 'block';
notifyElement.innerHTML = message;
}
function dismissNotify(message, timeout) {
var notifyElement = document.getElementById('mw-js-notify');
if ( notifyElement ) {
if ( timeout == 0 ) {
notifyElement.style.display = 'none';
} else {
notify(message);
setTimeout("dismissNotify('', 0)", timeout);
}
}
}
function createNotify() {
var div = document.createElement("div");
var txt = '###PLACEHOLDER###'
var txtNode = document.createTextNode(txt);
div.appendChild(txtNode);
div.id = 'mw-js-notify';
// TODO: move styles to css
div.setAttribute('style',
'display: none; position: fixed; bottom: 0px; right: 0px; color: white; background-color: DarkRed; z-index: 5; padding: 0.1em 1em 0.1em 1em; font-size: 120%;');
var body = document.getElementsByTagName('body')[0];
body.appendChild(div);
}
/* Helper function similar to wfMsgReplaceArgs() */
function i18n(message, keys) {
var localMessage = message;
if ( !keys ) { return localMessage; }
for( var i = 0; i < keys.length; i++) {
var myregexp = new RegExp("\\$"+(i+1), 'g');
localMessage = localMessage.replace(myregexp, keys[i]);
}
return localMessage;
}
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