## mark a section (Learn more)

var Class = { create: function() { return function() { this.initialize.apply(this, arguments); } } } Object.extend = function(destination, source) { for (var property in source) { destination[property] = source[property]; } return destination; } Object.extend(Object, { inspect: function(object) { try { if (object === undefined) return 'undefined'; if (object === null) return 'null'; return object.inspect ? object.inspect() : object.toString(); } catch (e) { if (e instanceof RangeError) return '...'; throw e; } }, keys: function(object) { var keys = []; for (var property in object) keys.push(property); return keys; }, values: function(object) { var values = []; for (var property in object) values.push(object[property]); return values; }, clone: function(object) { return Object.extend({}, object); } }); // original class: Ajax.Autocompleter = Class.create(); Object.extend(Object.extend(Ajax.Autocompleter.prototype, Autocompleter.Base.prototype), { initialize: function(element, update, url, options) { this.baseInitialize(element, update, options); this.options.asynchronous = true; this.options.onComplete = this.onComplete.bind(this); this.options.defaultParams = this.options.parameters || null; this.url = url; }, getUpdatedChoices: function() { entry = encodeURIComponent(this.options.paramName) + '=' + encodeURIComponent(this.getToken()); this.options.parameters = this.options.callback ? this.options.callback(this.element, entry) : entry; if(this.options.defaultParams) this.options.parameters += '&' + this.options.defaultParams; new Ajax.Request(this.url, this.options); }, onComplete: function(request) { this.updateChoices(request.responseText); } }); var Autocompleter = {} Autocompleter.Base = function() {}; Autocompleter.Base.prototype = { baseInitialize: function(element, update, options) { this.element = $(element); this.update = $(update); this.hasFocus = false; this.changed = false; this.active = false; this.index = 0; this.entryCount = 0; if(this.setOptions) this.setOptions(options); else this.options = options || {}; this.options.paramName = this.options.paramName || this.element.name; this.options.tokens = this.options.tokens || []; this.options.frequency = this.options.frequency || 0.4; this.options.minChars = this.options.minChars || 1; this.options.onShow = this.options.onShow || function(element, update){ if(!update.style.position || update.style.position=='absolute') { update.style.position = 'absolute'; Position.clone(element, update, { setHeight: false, offsetTop: element.offsetHeight }); } Effect.Appear(update,{duration:0.15}); }; this.options.onHide = this.options.onHide || function(element, update){ new Effect.Fade(update,{duration:0.15}) }; if(typeof(this.options.tokens) == 'string') this.options.tokens = new Array(this.options.tokens); this.observer = null; this.element.setAttribute('autocomplete','off'); Element.hide(this.update); Event.observe(this.element, "blur", this.onBlur.bindAsEventListener(this)); Event.observe(this.element, "keypress", this.onKeyPress.bindAsEventListener(this)); }, show: function() { if(Element.getStyle(this.update, 'display')=='none') this.options.onShow(this.element, this.update); if(!this.iefix && (navigator.appVersion.indexOf('MSIE')>0) && (navigator.userAgent.indexOf('Opera')<0) && (Element.getStyle(this.update, 'position')=='absolute')) { new Insertion.After(this.update, '<iframe id="' + this.update.id + '_iefix" '+ 'style="display:none;position:absolute;filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);" ' + 'src="javascript:false;" frameborder="0" scrolling="no"></iframe>'); this.iefix = $(this.update.id+'_iefix'); } if(this.iefix) setTimeout(this.fixIEOverlapping.bind(this), 50); }, fixIEOverlapping: function() { Position.clone(this.update, this.iefix, {setTop:(!this.update.style.height)}); this.iefix.style.zIndex = 1; this.update.style.zIndex = 2; Element.show(this.iefix); }, hide: function() { this.stopIndicator(); if(Element.getStyle(this.update, 'display')!='none') this.options.onHide(this.element, this.update); if(this.iefix) Element.hide(this.iefix); }, startIndicator: function() { if(this.options.indicator) Element.show(this.options.indicator); }, stopIndicator: function() { if(this.options.indicator) Element.hide(this.options.indicator); }, onKeyPress: function(event) { if(this.active) switch(event.keyCode) { case Event.KEY_TAB: case Event.KEY_RETURN: this.selectEntry(); Event.stop(event); case Event.KEY_ESC: this.hide(); this.active = false; Event.stop(event); return; case Event.KEY_LEFT: case Event.KEY_RIGHT: return; case Event.KEY_UP: this.markPrevious(); this.render(); if(navigator.appVersion.indexOf('AppleWebKit')>0) Event.stop(event); return; case Event.KEY_DOWN: this.markNext(); this.render(); if(navigator.appVersion.indexOf('AppleWebKit')>0) Event.stop(event); return; } else if(event.keyCode==Event.KEY_TAB || event.keyCode==Event.KEY_RETURN || (navigator.appVersion.indexOf('AppleWebKit') > 0 && event.keyCode == 0)) return; this.changed = true; this.hasFocus = true; if(this.observer) clearTimeout(this.observer); this.observer = setTimeout(this.onObserverEvent.bind(this), this.options.frequency*1000); }, activate: function() { this.changed = false; this.hasFocus = true; this.getUpdatedChoices(); }, onHover: function(event) { var element = Event.findElement(event, 'LI'); if(this.index != element.autocompleteIndex) { this.index = element.autocompleteIndex; this.render(); } Event.stop(event); }, onClick: function(event) { var element = Event.findElement(event, 'LI'); this.index = element.autocompleteIndex; this.selectEntry(); this.hide(); }, onBlur: function(event) { // needed to make click events working setTimeout(this.hide.bind(this), 250); this.hasFocus = false; this.active = false; }, render: function() { if(this.entryCount > 0) { for (var i = 0; i < this.entryCount; i++) this.index==i ? Element.addClassName(this.getEntry(i),"selected") : Element.removeClassName(this.getEntry(i),"selected"); if(this.hasFocus) { this.show(); this.active = true; } } else { this.active = false; this.hide(); } }, markPrevious: function() { if(this.index > 0) this.index-- else this.index = this.entryCount-1; this.getEntry(this.index).scrollIntoView(true); }, markNext: function() { if(this.index < this.entryCount-1) this.index++ else this.index = 0; this.getEntry(this.index).scrollIntoView(false); }, getEntry: function(index) { return this.update.firstChild.childNodes[index]; }, getCurrentEntry: function() { return this.getEntry(this.index); }, selectEntry: function() { this.active = false; this.updateElement(this.getCurrentEntry()); }, updateElement: function(selectedElement) { if (this.options.updateElement) { this.options.updateElement(selectedElement); return; } var value = ''; if (this.options.select) { var nodes = document.getElementsByClassName(this.options.select, selectedElement) || []; if(nodes.length>0) value = Element.collectTextNodes(nodes[0], this.options.select); } else value = Element.collectTextNodesIgnoreClass(selectedElement, 'informal'); var lastTokenPos = this.findLastToken(); if (lastTokenPos != -1) { var newValue = this.element.value.substr(0, lastTokenPos + 1); var whitespace = this.element.value.substr(lastTokenPos + 1).match(/^\s+/); if (whitespace) newValue += whitespace[0]; this.element.value = newValue + value; } else { this.element.value = value; } this.element.focus(); if (this.options.afterUpdateElement) this.options.afterUpdateElement(this.element, selectedElement); }, updateChoices: function(choices) { if(!this.changed && this.hasFocus) { this.update.innerHTML = choices; Element.cleanWhitespace(this.update); Element.cleanWhitespace(this.update.down()); if(this.update.firstChild && this.update.down().childNodes) { this.entryCount = this.update.down().childNodes.length; for (var i = 0; i < this.entryCount; i++) { var entry = this.getEntry(i); entry.autocompleteIndex = i; this.addObservers(entry); } } else { this.entryCount = 0; } this.stopIndicator(); this.index = 0; if(this.entryCount==1 && this.options.autoSelect) { this.selectEntry(); this.hide(); } else { this.render(); } } }, addObservers: function(element) { Event.observe(element, "mouseover", this.onHover.bindAsEventListener(this)); Event.observe(element, "click", this.onClick.bindAsEventListener(this)); }, onObserverEvent: function() { this.changed = false; if(this.getToken().length>=this.options.minChars) { this.startIndicator(); this.getUpdatedChoices(); } else { this.active = false; this.hide(); } }, getToken: function() { var tokenPos = this.findLastToken(); if (tokenPos != -1) var ret = this.element.value.substr(tokenPos + 1).replace(/^\s+/,'').replace(/\s+$/,''); else var ret = this.element.value; return /\n/.test(ret) ? '' : ret; }, findLastToken: function() { var lastTokenPos = -1; for (var i=0; i<this.options.tokens.length; i++) { var thisTokenPos = this.element.value.lastIndexOf(this.options.tokens[i]); if (thisTokenPos > lastTokenPos) lastTokenPos = thisTokenPos; } return lastTokenPos; } }

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