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+
+/**
+ * An autosuggest textbox control.
+ * @class
+ * @scope public
+ */
+function AutoSuggestControl(oTextbox /*:HTMLInputElement*/,
+ oProvider /*:SuggestionProvider*/) {
+
+ /**
+ * The currently selected suggestions.
+ * @scope private
+ */
+ this.cur /*:int*/ = -1;
+
+ /**
+ * The dropdown list layer.
+ * @scope private
+ */
+ this.layer = null;
+
+ /**
+ * Suggestion provider for the autosuggest feature.
+ * @scope private.
+ */
+ this.provider /*:SuggestionProvider*/ = oProvider;
+
+ /**
+ * The textbox to capture.
+ * @scope private
+ */
+ this.textbox /*:HTMLInputElement*/ = oTextbox;
+
+ //initialize the control
+ this.init();
+
+}
+
+/**
+ * Autosuggests one or more suggestions for what the user has typed.
+ * If no suggestions are passed in, then no autosuggest occurs.
+ * @scope private
+ * @param aSuggestions An array of suggestion strings.
+ * @param bTypeAhead If the control should provide a type ahead suggestion.
+ */
+AutoSuggestControl.prototype.autosuggest = function (aSuggestions /*:Array*/,
+ bTypeAhead /*:boolean*/) {
+
+ //make sure there's at least one suggestion
+ if (aSuggestions.length > 0) {
+ if (bTypeAhead) {
+ this.typeAhead(aSuggestions[0]);
+ }
+
+ this.showSuggestions(aSuggestions);
+ } else {
+ this.hideSuggestions();
+ }
+};
+
+/**
+ * Creates the dropdown layer to display multiple suggestions.
+ * @scope private
+ */
+AutoSuggestControl.prototype.createDropDown = function () {
+
+ var oThis = this;
+
+ //create the layer and assign styles
+ this.layer = document.createElement("div");
+ this.layer.className = "suggestions";
+ this.layer.style.visibility = "hidden";
+ this.layer.style.width = this.textbox.offsetWidth;
+
+ //when the user clicks on the a suggestion, get the text (innerHTML)
+ //and place it into a textbox
+ this.layer.onmousedown =
+ this.layer.onmouseup =
+ this.layer.onmouseover = function (oEvent) {
+ oEvent = oEvent || window.event;
+ oTarget = oEvent.target || oEvent.srcElement;
+
+ if (oEvent.type == "mousedown") {
+ oThis.textbox.value = oTarget.firstChild.nodeValue;
+ oThis.hideSuggestions();
+ } else if (oEvent.type == "mouseover") {
+ oThis.highlightSuggestion(oTarget);
+ } else {
+ oThis.textbox.focus();
+ }
+ };
+
+
+ document.body.appendChild(this.layer);
+};
+
+/**
+ * Gets the left coordinate of the textbox.
+ * @scope private
+ * @return The left coordinate of the textbox in pixels.
+ */
+AutoSuggestControl.prototype.getLeft = function () /*:int*/ {
+
+ var oNode = this.textbox;
+ var iLeft = 0;
+
+ while(oNode.tagName != "BODY") {
+ iLeft += oNode.offsetLeft;
+ oNode = oNode.offsetParent;
+ }
+
+ return iLeft;
+};
+
+/**
+ * Gets the top coordinate of the textbox.
+ * @scope private
+ * @return The top coordinate of the textbox in pixels.
+ */
+AutoSuggestControl.prototype.getTop = function () /*:int*/ {
+
+ var oNode = this.textbox;
+ var iTop = 0;
+
+ while(oNode.tagName != "BODY") {
+ iTop += oNode.offsetTop;
+ oNode = oNode.offsetParent;
+ }
+
+ return iTop;
+};
+
+/**
+ * Handles three keydown events.
+ * @scope private
+ * @param oEvent The event object for the keydown event.
+ */
+AutoSuggestControl.prototype.handleKeyDown = function (oEvent /*:Event*/) {
+
+ switch(oEvent.keyCode) {
+ case 38: //up arrow
+ this.previousSuggestion();
+ break;
+ case 40: //down arrow
+ this.nextSuggestion();
+ break;
+ case 13: //enter
+ this.hideSuggestions();
+ break;
+ }
+
+};
+
+/**
+ * Handles keyup events.
+ * @scope private
+ * @param oEvent The event object for the keyup event.
+ */
+AutoSuggestControl.prototype.handleKeyUp = function (oEvent /*:Event*/) {
+
+ var iKeyCode = oEvent.keyCode;
+
+ //for backspace (8) and delete (46), shows suggestions without typeahead
+ if (iKeyCode == 8 || iKeyCode == 46) {
+ this.provider.requestSuggestions(this, false);
+
+ //make sure not to interfere with non-character keys
+ } else if (iKeyCode < 32 || (iKeyCode >= 33 && iKeyCode < 46) || (iKeyCode >= 112 && iKeyCode <= 123)) {
+ //ignore
+ } else {
+ //request suggestions from the suggestion provider with typeahead
+ this.provider.requestSuggestions(this, true);
+ }
+};
+
+/**
+ * Hides the suggestion dropdown.
+ * @scope private
+ */
+AutoSuggestControl.prototype.hideSuggestions = function () {
+ this.layer.style.visibility = "hidden";
+};
+
+/**
+ * Highlights the given node in the suggestions dropdown.
+ * @scope private
+ * @param oSuggestionNode The node representing a suggestion in the dropdown.
+ */
+AutoSuggestControl.prototype.highlightSuggestion = function (oSuggestionNode) {
+
+ for (var i=0; i < this.layer.childNodes.length; i++) {
+ var oNode = this.layer.childNodes[i];
+ if (oNode == oSuggestionNode) {
+ oNode.className = "current";
+ } else if (oNode.className == "current") {
+ oNode.className = "";
+ }
+ }
+};
+
+/**
+ * Initializes the textbox with event handlers for
+ * auto suggest functionality.
+ * @scope private
+ */
+AutoSuggestControl.prototype.init = function () {
+
+ //save a reference to this object
+ var oThis = this;
+
+ //assign the onkeyup event handler
+ this.textbox.onkeyup = function (oEvent) {
+
+ //check for the proper location of the event object
+ if (!oEvent) {
+ oEvent = window.event;
+ }
+
+ //call the handleKeyUp() method with the event object
+ oThis.handleKeyUp(oEvent);
+ };
+
+ //assign onkeydown event handler
+ this.textbox.onkeydown = function (oEvent) {
+
+ //check for the proper location of the event object
+ if (!oEvent) {
+ oEvent = window.event;
+ }
+
+ //call the handleKeyDown() method with the event object
+ oThis.handleKeyDown(oEvent);
+ };
+
+ //assign onblur event handler (hides suggestions)
+ this.textbox.onblur = function () {
+ oThis.hideSuggestions();
+ };
+
+ //create the suggestions dropdown
+ this.createDropDown();
+};
+
+/**
+ * Highlights the next suggestion in the dropdown and
+ * places the suggestion into the textbox.
+ * @scope private
+ */
+AutoSuggestControl.prototype.nextSuggestion = function () {
+ var cSuggestionNodes = this.layer.childNodes;
+
+ if (cSuggestionNodes.length > 0 && this.cur < cSuggestionNodes.length-1) {
+ var oNode = cSuggestionNodes[++this.cur];
+ this.highlightSuggestion(oNode);
+ this.textbox.value = oNode.firstChild.nodeValue;
+ }
+};
+
+/**
+ * Highlights the previous suggestion in the dropdown and
+ * places the suggestion into the textbox.
+ * @scope private
+ */
+AutoSuggestControl.prototype.previousSuggestion = function () {
+ var cSuggestionNodes = this.layer.childNodes;
+
+ if (cSuggestionNodes.length > 0 && this.cur > 0) {
+ var oNode = cSuggestionNodes[--this.cur];
+ this.highlightSuggestion(oNode);
+ this.textbox.value = oNode.firstChild.nodeValue;
+ }
+};
+
+/**
+ * Selects a range of text in the textbox.
+ * @scope public
+ * @param iStart The start index (base 0) of the selection.
+ * @param iLength The number of characters to select.
+ */
+AutoSuggestControl.prototype.selectRange = function (iStart /*:int*/, iLength /*:int*/) {
+
+ //use text ranges for Internet Explorer
+ if (this.textbox.createTextRange) {
+ var oRange = this.textbox.createTextRange();
+ oRange.moveStart("character", iStart);
+ oRange.moveEnd("character", iLength - this.textbox.value.length);
+ oRange.select();
+
+ //use setSelectionRange() for Mozilla
+ } else if (this.textbox.setSelectionRange) {
+ this.textbox.setSelectionRange(iStart, iLength);
+ }
+
+ //set focus back to the textbox
+ this.textbox.focus();
+};
+
+/**
+ * Builds the suggestion layer contents, moves it into position,
+ * and displays the layer.
+ * @scope private
+ * @param aSuggestions An array of suggestions for the control.
+ */
+AutoSuggestControl.prototype.showSuggestions = function (aSuggestions /*:Array*/) {
+
+ var oDiv = null;
+ this.layer.innerHTML = ""; //clear contents of the layer
+
+ for (var i=0; i < aSuggestions.length; i++) {
+ oDiv = document.createElement("div");
+ oDiv.appendChild(document.createTextNode(aSuggestions[i]));
+ this.layer.appendChild(oDiv);
+ }
+
+ this.layer.style.left = this.getLeft() + "px";
+ this.layer.style.top = (this.getTop()+this.textbox.offsetHeight) + "px";
+ this.layer.style.width = this.textbox.offsetWidth + "px";
+ this.layer.style.visibility = "visible";
+
+};
+
+/**
+ * Inserts a suggestion into the textbox, highlighting the
+ * suggested part of the text.
+ * @scope private
+ * @param sSuggestion The suggestion for the textbox.
+ */
+AutoSuggestControl.prototype.typeAhead = function (sSuggestion /*:String*/) {
+
+ //check for support of typeahead functionality
+ if (this.textbox.createTextRange || this.textbox.setSelectionRange){
+ var iLen = this.textbox.value.length;
+ this.textbox.value = sSuggestion;
+ this.selectRange(iLen, sSuggestion.length);
+ }
+};
+
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