// $Id: drupal.js,v 1.22.2.4 2006/12/01 14:57:29 killes Exp $ /** * Only enable Javascript functionality if all required features are supported. */ function isJsEnabled() { if (typeof document.jsEnabled == 'undefined') { // Note: ! casts to boolean implicitly. document.jsEnabled = !( !document.getElementsByTagName || !document.createElement || !document.createTextNode || !document.documentElement || !document.getElementById); } return document.jsEnabled; } // Global Killswitch on the element if (isJsEnabled()) { document.documentElement.className = 'js'; } /** * Make IE's XMLHTTP object accessible through XMLHttpRequest() */ if (typeof XMLHttpRequest == 'undefined') { XMLHttpRequest = function () { var msxmls = ['MSXML3', 'MSXML2', 'Microsoft'] for (var i=0; i < msxmls.length; i++) { try { return new ActiveXObject(msxmls[i]+'.XMLHTTP') } catch (e) { } } throw new Error("No XML component installed!"); } } /** * Creates an HTTP GET request and sends the response to the callback function. * * Note that dynamic arguments in the URI should be escaped with encodeURIComponent(). */ function HTTPGet(uri, callbackFunction, callbackParameter) { var xmlHttp = new XMLHttpRequest(); var bAsync = true; if (!callbackFunction) { bAsync = false; } xmlHttp.open('GET', uri, bAsync); xmlHttp.setRequestHeader('If-Modified-Since', 'Sat, 1 Jan 2000 00:00:00 GMT'); xmlHttp.send(null); if (bAsync) { xmlHttp.onreadystatechange = function() { if (xmlHttp.readyState == 4) { callbackFunction(xmlHttp.responseText, xmlHttp, callbackParameter); } } return xmlHttp; } else { return xmlHttp.responseText; } } /** * Creates an HTTP POST request and sends the response to the callback function * * Note: passing null or undefined for 'object' makes the request fail in Opera 8. * Pass an empty string instead. */ function HTTPPost(uri, callbackFunction, callbackParameter, object) { var xmlHttp = new XMLHttpRequest(); var bAsync = true; if (!callbackFunction) { bAsync = false; } xmlHttp.open('POST', uri, bAsync); var toSend = ''; if (typeof object == 'object') { xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); for (var i in object) { toSend += (toSend ? '&' : '') + i + '=' + encodeURIComponent(object[i]); } } else { toSend = object; } xmlHttp.send(toSend); if (bAsync) { xmlHttp.onreadystatechange = function() { if (xmlHttp.readyState == 4) { callbackFunction(xmlHttp.responseText, xmlHttp, callbackParameter); } } return xmlHttp; } else { return xmlHttp.responseText; } } /** * Redirects a button's form submission to a hidden iframe and displays the result * in a given wrapper. The iframe should contain a call to * window.parent.iframeHandler() after submission. */ function redirectFormButton(uri, button, handler) { // (Re)create an iframe to target. createIframe(); // Trap the button button.onmouseover = button.onfocus = function() { button.onclick = function() { // Prepare variables for use in anonymous function. var button = this; var action = button.form.action; var target = button.form.target; // Redirect form submission this.form.action = uri; this.form.target = 'redirect-target'; handler.onsubmit(); // Set iframe handler for later window.iframeHandler = function () { var iframe = $('redirect-target'); // Restore form submission button.form.action = action; button.form.target = target; // Get response from iframe body try { response = (iframe.contentWindow || iframe.contentDocument || iframe).document.body.innerHTML; // Firefox 1.0.x hack: Remove (corrupted) control characters response = response.replace(/[\f\n\r\t]/g, ' '); if (window.opera) { // Opera-hack: it returns innerHTML sanitized. response = response.replace(/"/g, '"'); } } catch (e) { response = null; } $('redirect-target').onload = null; $('redirect-target').src = 'about:blank'; response = parseJson(response); // Check response code if (response.status == 0) { handler.onerror(response.data); return; } handler.oncomplete(response.data); } return true; } } button.onmouseout = button.onblur = function() { button.onclick = null; } } /** * Adds a function to the window onload event */ function addLoadEvent(func) { var oldOnload = window.onload; if (typeof window.onload != 'function') { window.onload = func; } else { window.onload = function() { oldOnload(); func(); } } } /** * Adds a function to a given form's submit event */ function addSubmitEvent(form, func) { var oldSubmit = form.onsubmit; if (typeof oldSubmit != 'function') { form.onsubmit = func; } else { form.onsubmit = function() { return oldSubmit() && func(); } } } /** * Retrieves the absolute position of an element on the screen */ function absolutePosition(el) { var sLeft = 0, sTop = 0; var isDiv = /^div$/i.test(el.tagName); if (isDiv && el.scrollLeft) { sLeft = el.scrollLeft; } if (isDiv && el.scrollTop) { sTop = el.scrollTop; } var r = { x: el.offsetLeft - sLeft, y: el.offsetTop - sTop }; if (el.offsetParent) { var tmp = absolutePosition(el.offsetParent); r.x += tmp.x; r.y += tmp.y; } return r; }; function dimensions(el) { return { width: el.offsetWidth, height: el.offsetHeight }; } /** * Returns true if an element has a specified class name */ function hasClass(node, className) { if (node.className == className) { return true; } var reg = new RegExp('(^| )'+ className +'($| )') if (reg.test(node.className)) { return true; } return false; } /** * Adds a class name to an element */ function addClass(node, className) { if (hasClass(node, className)) { return false; } node.className += ' '+ className; return true; } /** * Removes a class name from an element */ function removeClass(node, className) { if (!hasClass(node, className)) { return false; } // Replaces words surrounded with whitespace or at a string border with a space. Prevents multiple class names from being glued together. node.className = eregReplace('(^|\\s+)'+ className +'($|\\s+)', ' ', node.className); return true; } /** * Toggles a class name on or off for an element */ function toggleClass(node, className) { if (!removeClass(node, className) && !addClass(node, className)) { return false; } return true; } /** * Emulate PHP's ereg_replace function in javascript */ function eregReplace(search, replace, subject) { return subject.replace(new RegExp(search,'g'), replace); } /** * Removes an element from the page */ function removeNode(node) { if (typeof node == 'string') { node = $(node); } if (node && node.parentNode) { return node.parentNode.removeChild(node); } else { return false; } } /** * Prevents an event from propagating. */ function stopEvent(event) { if (event.preventDefault) { event.preventDefault(); event.stopPropagation(); } else { event.returnValue = false; event.cancelBubble = true; } } /** * Parse a JSON response. * * The result is either the JSON object, or an object with 'status' 0 and 'data' an error message. */ function parseJson(data) { if (data.substring(0,1) != '{') { return { status: 0, data: data.length ? data : 'Unspecified error' }; } return eval('(' + data + ');'); } /** * Create an invisible iframe for form submissions. */ function createIframe() { // Delete any previous iframe deleteIframe(); // Note: some browsers require the literal name/id attributes on the tag, // some want them set through JS. We do both. window.iframeHandler = function () {}; var div = document.createElement('div'); div.id = 'redirect-holder'; div.innerHTML = ''; var iframe = div.firstChild; with (iframe) { name = 'redirect-target'; setAttribute('name', 'redirect-target'); id = 'redirect-target'; } with (iframe.style) { position = 'absolute'; height = '1px'; width = '1px'; visibility = 'hidden'; } document.body.appendChild(div); } /** * Delete the invisible iframe for form submissions. */ function deleteIframe() { var holder = $('redirect-holder'); if (holder != null) { removeNode(holder); } } /** * Wrapper around document.getElementById(). function $(id) { return document.getElementById(id); } */