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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;
- /**
- * Timeout ID for fast typers.
- * @scope private
- */
- this.timeoutId /*:int*/ = null;
- /**
- * The text that the user typed.
- * @scope private
- */
- this.userText /*:String*/ = oTextbox.value;
- //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*/) {
- //re-initialize pointer to current suggestion
- this.cur = -1;
- //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 () {
- //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;
- document.body.appendChild(this.layer);
- //when the user clicks on the a suggestion, get the text (innerHTML)
- //and place it into a textbox
- var oThis = this;
- 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();
- }
- };
- };
- /**
- * 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;
- };
- /**
- * Highlights the next or previous suggestion in the dropdown and
- * places the suggestion into the textbox.
- * @param iDiff Either a positive or negative number indicating whether
- * to select the next or previous sugggestion, respectively.
- * @scope private
- */
- AutoSuggestControl.prototype.goToSuggestion = function (iDiff /*:int*/) {
- var cSuggestionNodes = this.layer.childNodes;
- if (cSuggestionNodes.length > 0) {
- var oNode = null;
- if (iDiff > 0) {
- if (this.cur < cSuggestionNodes.length-1) {
- oNode = cSuggestionNodes[++this.cur];
- }
- } else {
- if (this.cur > 0) {
- oNode = cSuggestionNodes[--this.cur];
- }
- }
- if (oNode) {
- this.highlightSuggestion(oNode);
- this.textbox.value = oNode.firstChild.nodeValue;
- }
- }
- };
- /**
- * 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.goToSuggestion(-1);
- break;
- case 40: //down arrow
- this.goToSuggestion(1);
- break;
- case 27: //esc
- this.textbox.value = this.userText;
- this.selectRange(this.userText.length, 0);
- /* falls through */
- case 13: //enter
- this.hideSuggestions();
- oEvent.returnValue = false;
- if (oEvent.preventDefault) {
- oEvent.preventDefault();
- }
- 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;
- var oThis = this;
- //get the currently entered text
- this.userText = this.textbox.value;
- clearTimeout(this.timeoutId);
- //for backspace (8) and delete (46), shows suggestions without typeahead
- if (iKeyCode == 8 || iKeyCode == 46) {
- this.timeoutId = setTimeout( function () {
- oThis.provider.requestSuggestions(oThis, false);
- }, 250);
- //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.timeoutId = setTimeout( function () {
- oThis.provider.requestSuggestions(oThis, true);
- }, 250);
- }
- };
- /**
- * 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();
- };
- /**
- * Selects a range of text in the textbox.
- * @scope public
- * @param iStart The start index (base 0) of the selection.
- * @param iEnd The end index of the selection.
- */
- AutoSuggestControl.prototype.selectRange = function (iStart /*:int*/, iEnd /*:int*/) {
- //use text ranges for Internet Explorer
- if (this.textbox.createTextRange) {
- var oRange = this.textbox.createTextRange();
- oRange.moveStart("character", iStart);
- oRange.moveEnd("character", iEnd - this.textbox.value.length);
- oRange.select();
- //use setSelectionRange() for Mozilla
- } else if (this.textbox.setSelectionRange) {
- this.textbox.setSelectionRange(iStart, iEnd);
- }
- //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.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);
- }
- };
- /**
- * Provides suggestions for state/province names.
- * @class
- * @scope public
- */
- function SuggestionProvider() {
- this.http = zXmlHttp.createRequest();
- }
- /**
- * Request suggestions for the given autosuggest control.
- * @scope protected
- * @param oAutoSuggestControl The autosuggest control to provide suggestions for.
- */
- SuggestionProvider.prototype.requestSuggestions = function (oAutoSuggestControl /*:AutoSuggestControl*/,
- bTypeAhead /*:boolean*/) {
- var oHttp = this.http;
- //cancel any active requests
- if (oHttp.readyState != 0) {
- oHttp.abort();
- }
- //define the data
- var oData = {
- requesting: "CitiesInRussia",
- text: oAutoSuggestControl.userText,
- limit: 5
- };
- //open connection to server
- oHttp.open("post", "suggestions.php", true);
- oHttp.onreadystatechange = function () {
- if (oHttp.readyState == 4) {
- //evaluate the returned text JavaScript (an array)
- var aSuggestions = JSON.parse(oHttp.responseText);
- //provide suggestions to the control
- oAutoSuggestControl.autosuggest(aSuggestions, bTypeAhead);
- }
- };
- //send the request
- oHttp.send(JSON.stringify(oData));
- };
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