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Wicket component for selecting entities via autocomplete
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Wicket Ajax Autocomplete
*
* @author Janne Hietamäki
*/
if (typeof(Wicket) == "undefined")
Wicket = { };
Wicket.AutoCompleteSettings = {
enterHidesWithNoSelection : false
};
Wicket.AutoComplete = function(elementId, callbackUrl, cfg) {
var KEY_TAB = 9;
var KEY_ENTER = 13;
var KEY_ESC = 27;
var KEY_LEFT = 37;
var KEY_UP = 38;
var KEY_RIGHT = 39;
var KEY_DOWN = 40;
var KEY_SHIFT = 16;
var KEY_CTRL = 17;
var KEY_ALT = 18;
var selected = -1; // index of the currently selected item
var mouseactive = 0;
var visible = 0; // is the list visible
var hidingAutocomplete = 0; // are we hiding the autocomplete list
var selectables = [];
// pointers of the browser events
var objonkeydown;
var objonblur;
var objonkeyup;
var objonkeypress;
// remember this object in order to reference to it even in
// callback function (closure)
var acObject = this;
function initialize() {
var obj = Wicket.DOM.get(elementId);
objonkeydown = obj.onkeydown;
objonblur = obj.onblur;
objonkeyup = obj.onkeyup;
objonkeypress = obj.onkeypress;
obj.onblur = function(event) {
if (mouseactive == 1) {
Wicket.$(elementId).focus();
return Wicket.Event.stop(event);
}
hideAutoComplete();
if (typeof objonblur == "function")objonblur();
}
obj.onkeydown = function(event) {
switch (Wicket.Event.fix(event)) {
case KEY_UP:
if (selected > -1)selected--;
if (selected == -1) {
hideAutoComplete();
} else {
render();
}
if (Wicket.Browser.isSafari())return Wicket.Event.stop(event);
break;
case KEY_DOWN:
if (selected < selectables.length - 1) {
selected++;
}
if (visible == 0) {
updateChoices();
} else {
render();
showAutoComplete();
}
if (Wicket.Browser.isSafari())return Wicket.Event.stop(event);
break;
case KEY_ESC:
hideAutoComplete();
return Wicket.Event.stop(event);
break;
case KEY_ENTER:
if (selected > -1) {
acObject.updateValue();
hideAutoComplete();
hidingAutocomplete = 1;
} else if (Wicket.AutoCompleteSettings.enterHidesWithNoSelection == true) {
hideAutoComplete();
hidingAutocomplete = 1;
}
mouseactive = 0;
if (typeof objonkeydown == "function")objonkeydown();
if (selected > -1) {
//return Wicket.Event.stop(event);
}
return true;
break;
default:
}
}
obj.onkeyup = function(event) {
switch (Wicket.Event.fix(event)) {
case KEY_ENTER:
return Wicket.Event.stop(event);
case KEY_UP:
case KEY_DOWN:
case KEY_ESC:
case KEY_TAB:
case KEY_RIGHT:
case KEY_LEFT:
case KEY_SHIFT:
case KEY_ALT:
case KEY_CTRL:
break;
default:
updateChoices();
}
if (typeof objonkeyup == "function")objonkeyup();
return null;
}
obj.onkeypress = function(event) {
if (Wicket.Event.fix(event) == KEY_ENTER) {
if (selected > -1 || hidingAutocomplete == 1) {
hidingAutocomplete = 0;
return Wicket.Event.stop(event);
}
}
if (typeof objonkeypress == "function") {
return (objonkeypress.bind(obj))(event);
}
}
}
this.getMenuId = function() {
return elementId + "-autocomplete";
}
function getAutocompleteMenu() {
var choiceDiv = document.getElementById(acObject.getMenuId());
if (choiceDiv == null) {
var container = document.createElement("div");
container.className = "wicket-aa-container";
document.body.appendChild(container);
container.style.display = "none";
container.style.overflow = "auto";
container.style.position = "absolute";
container.id = acObject.getMenuId() + "-container";
container.show = function() {
Wicket.DOM.show(this.id)
};
container.hide = function() {
Wicket.DOM.hide(this.id)
};
choiceDiv = document.createElement("div");
container.appendChild(choiceDiv);
choiceDiv.id = acObject.getMenuId();
choiceDiv.className = "wicket-aa";
// WICKET-1350/WICKET-1351
container.onmouseout = function() {
mouseactive = 0;
};
container.onmousemove = function() {
mouseactive = 1;
};
}
return choiceDiv;
}
function getAutocompleteContainer() {
var node = getAutocompleteMenu().parentNode;
return node;
}
function updateChoices() {
if (cfg.preselect == true) {
selected = 0;
}
else {
selected = -1;
}
var value = Wicket.DOM.get(elementId).value;
Wicket.Ajax.get({
u: callbackUrl + "&q=" + processValue(value),
sh: [doUpdateChoices],
ch: "wicket-autocomplete|d"
});
}
function processValue(param) {
return (encodeURIComponent) ? encodeURIComponent(param) : escape(param);
}
function showAutoComplete() {
var position = getPosition(Wicket.DOM.get(elementId));
var container = getAutocompleteContainer();
var input = Wicket.DOM.get(elementId);
var index = getOffsetParentZIndex(elementId);
container.show();
container.style.zIndex = (!isNaN(Number(index)) ? Number(index) + 1 : index);
container.style.left = position[0] + 'px'
container.style.top = (input.offsetHeight + position[1]) + 'px';
container.style.width = input.offsetWidth + 'px';
visible = 1;
hideShowCovered();
}
function hideAutoComplete() {
visible = 0;
selected = -1;
if (getAutocompleteContainer())
{
getAutocompleteContainer().hide();
hideShowCovered();
}
}
function getPosition(obj) {
var leftPosition = 0;
var topPosition = 0;
do {
topPosition += obj.offsetTop || 0;
leftPosition += obj.offsetLeft || 0;
obj = obj.offsetParent;
} while (obj);
return [leftPosition,topPosition];
}
function doUpdateChoices(attrs, jqXHR, data, textStatus) {
// check if the input hasn't been cleared in the meanwhile
var input = Wicket.DOM.get(elementId);
if (!cfg.showListOnEmptyInput && (input.value == null || input.value == "")) {
hideAutoComplete();
return;
}
var element = getAutocompleteMenu();
element.innerHTML = data;
selectables = extractSelectables(element.firstChild);
if (selectables.length > 0) {
for (var i = 0; i < selectables.length; i++) {
var node = selectables[i];
node.onclick = function(event) {
mouseactive = 0;
acObject.updateValue();
hideAutoComplete();
}
node.onmouseover = function(event) {
selected = getElementIndex(this);
render();
showAutoComplete();
}
}
showAutoComplete();
} else {
hideAutoComplete();
}
render();
scheduleEmptyCheck();
Wicket.Log.info("Response processed successfully.");
}
function extractSelectables(element) {
// All children which are elements are considered
// as selectables
var listElements = [];
var nodeName = (cfg.choiceTagName || 'LI').toUpperCase();
if (element) {
(function(el) {
if (el.nodeType == 1 && el.nodeName.toUpperCase() == nodeName) {
// Add only list items
listElements.push(el);
}
if (el.hasChildNodes()) {
for (var i = 0; i < el.childNodes.length; i++) {
arguments.callee(el.childNodes[i]);
}
}
})(element);
}
return listElements;
}
function scheduleEmptyCheck() {
window.setTimeout(function() {
var input = Wicket.DOM.get(elementId);
if (!cfg.showListOnEmptyInput && (input.value == null || input.value == "")) {
hideAutoComplete();
}
}, 100);
}
this.updateValue = function() {
var obj = Wicket.DOM.get(elementId);
obj.value = this.getSelectedValue();
}
this.getSelectedValue = function() {
var element = this.getSelectedElement();
var attr = element.attributes['textvalue'];
var value;
if (attr == undefined) {
value = element.innerHTML;
} else {
value = attr.value;
}
return stripHTML(value);
}
this.getSelectedElement = function() {
return selectables[selected];
}
function getElementIndex(element) {
for (var i = 0; i < selectables.length; i++) {
if (selectables[i] == element)return i;
}
return -1;
}
function stripHTML(str) {
return str.replace(/<[^>]+>/g, "");
}
function adjustScrollOffset(menu, item) {
if (item.offsetTop + item.offsetHeight > menu.scrollTop + menu.offsetHeight) {
menu.scrollTop = item.offsetTop + item.offsetHeight - menu.offsetHeight;
} else
// adjust to the top
if (item.offsetTop < menu.scrollTop) {
menu.scrollTop = item.offsetTop;
}
}
function render() {
var menu = getAutocompleteMenu();
var height = 0;
for (var i = 0; i < selectables.length; i++) {
var node = selectables[i];
var classNames = node.className.split(" ");
for (var j = 0; j < classNames.length; j++) {
if (classNames[j] == 'selected') {
classNames[j] = '';
}
}
if (selected == i) {
classNames.push('selected');
adjustScrollOffset(menu.parentNode, node);
}
node.className = classNames.join(" ");
height += node.offsetHeight;
}
if (cfg.maxHeight > -1) {
height = height < cfg.maxHeight ? height : cfg.maxHeight;
menu.parentNode.style.height = height + "px";
}
}
// From http://www.robertnyman.com/2006/04/24/get-the-rendered-style-of-an-element/
function getStyle(obj, cssRule) {
var cssRuleAlt = cssRule.replace(/\-(\w)/g, function(strMatch, p1) {
return p1.toUpperCase();
});
var value = obj.style[cssRuleAlt];
if (!value) {
if (document.defaultView && document.defaultView.getComputedStyle) {
value = document.defaultView.getComputedStyle(obj, "").getPropertyValue(cssRule);
}
else if (obj.currentStyle)
{
value = obj.currentStyle[cssRuleAlt];
}
}
return value;
}
function isVisible(obj) {
return getStyle(obj, "visibility");
}
function getOffsetParentZIndex(obj) {
obj = typeof obj == "string" ? Wicket.$(obj) : obj;
obj = obj.offsetParent;
var index = "auto";
do {
var pos = getStyle(obj, "position");
if (pos == "relative" || pos == "absolute" || pos == "fixed") {
index = getStyle(obj, "z-index");
}
obj = obj.offsetParent;
} while (obj && index == "auto");
return index;
}
function hideShowCovered() {
if (!/msie/i.test(navigator.userAgent) && !/opera/i.test(navigator.userAgent)) {
return;
}
// IE7 fix, if this doesn't go in a timeout then the complete page could become invisible.
// when closing the popup.
setTimeout(hideShowCoveredTimeout, 1);
}
function hideShowCoveredTimeout() {
var el = getAutocompleteContainer();
var p = getPosition(el);
var acLeftX = p[0];
var acRightX = el.offsetWidth + acLeftX;
var acTopY = p[1];
var acBottomY = el.offsetHeight + acTopY;
var hideTags = new Array("select", "iframe", "applet");
for (var j = 0; j < hideTags.length; j++) {
var tagsFound = document.getElementsByTagName(hideTags[j]);
for (var i = 0; i < tagsFound.length; i++) {
var tag = tagsFound[i];
p = getPosition(tag);
var leftX = p[0];
var rightX = leftX + tag.offsetWidth;
var topY = p[1];
var bottomY = topY + tag.offsetHeight;
if (this.hidden || (leftX > acRightX) || (rightX < acLeftX) || (topY > acBottomY) || (bottomY < acTopY)) {
if (!tag.wicket_element_visibility) {
tag.wicket_element_visibility = isVisible(tag);
}
tag.style.visibility = tag.wicket_element_visibility;
} else {
if (!tag.wicket_element_visibility) {
tag.wicket_element_visibility = isVisible(tag);
}
tag.style.visibility = "hidden";
}
}
}
}
initialize();
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