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treeview-karlgroves.html
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treeview-karlgroves.html
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<!DOCTYPE html>
<html>
<head>
<!--//
NOTE:
Treeview menu example borrowed directly from http://oaa-accessibility.org/examplep/treeview1/
//-->
<meta charset="UTF-8"/>
<title>treeview-karlgroves</title>
<link rel="stylesheet" type="text/css" href="/global-assets/css/global.css" />
<script src="global-assets/jquery-1.11.0.min.js"></script>
<style type="text/css">
h2#label_1 {
margin: .5em 0 !important;
padding: 0 !important;
font-size: 1.6em !important;
}
ul.tree {
width: 16em;
font-size: 100% !important;
}
ul.tree, ul.tree ul {
list-style: none;
margin: 0 !important;
padding-left: 20px !important;
font-weight: normal;
font-size: 100% !important;
background-color: #f9f9f9;
color: black;
}
ul.tree li {
margin-left: 17px !important;
}
li.tree-parent {
font-weight: bold;
margin-left: 0px;
}
img.headerImg {
margin-right: 5px;
}
li.tree-focus {
color: white;
background: black;
}
</style>
</head>
<body>
<div id="application" role="application">
<h2 id="label_1">Foods</h2>
<ul id="tree1" class="tree root-level" role="tree" aria-labelledby="label_1">
<li id="fruits" class="tree-parent" role="treeitem" tabindex="0" aria-expanded="true"><span>Fruits</span>
<ul id="fruit-grp" role="group">
<li id="oranges" role="treeitem" tabindex="-1">Oranges</li>
<li id="pinapples" role="treeitem" tabindex="-1">Pineapples</li>
<li id="apples" class="tree-parent" role="treeitem" tabindex="-1" aria-expanded="false"><span>Apples</span>
<ul id="apple-grp" role="group">
<li id="macintosh" role="treeitem" tabindex="-1">Macintosh</li>
<li id="granny_smith" class="tree-parent" role="treeitem" tabindex="-1" aria-expanded="false"><span>Granny Smith</span>
<ul id="granny-grp" role="group">
<li id="Washington" role="treeitem" tabindex="-1">Washington State</li>
<li id="Michigan" role="treeitem" tabindex="-1">Michigan</li>
<li id="New_York" role="treeitem" tabindex="-1">New York</li>
</ul>
</li>
<li id="fuji" role="treeitem" tabindex="-1">Fuji</li>
</ul>
</li>
<li id="bananas" role="treeitem" tabindex="-1">Bananas</li>
<li id="pears" role="treeitem" tabindex="-1">Pears</li>
</ul>
</li>
<li id="vegetables" class="tree-parent" role="treeitem" tabindex="-1" aria-expanded="true"><span>Vegetables</span>
<ul id="veg-grp" role="group">
<li id="broccoli" role="treeitem" tabindex="-1">Broccoli</li>
<li id="carrots" role="treeitem" tabindex="-1">Carrots</li>
<li id="lettuce" class="tree-parent" role="treeitem" tabindex="-1" aria-expanded="false"><span>Lettuce</span>
<ul id="lettuce-grp" role="group">
<li id="romaine" role="treeitem" tabindex="-1">Romaine</li>
<li id="iceberg" role="treeitem" tabindex="-1">Iceberg</li>
<li id="butterhead" role="treeitem" tabindex="-1">Butterhead</li>
</ul>
</li>
<li id="spinach" role="treeitem" tabindex="-1">Spinach</li>
<li id="squash" class="tree-parent" role="treeitem" tabindex="-1" aria-expanded="true"><span>Squash</span>
<ul id="squash-grp" role="group">
<li id="acorn" role="treeitem" tabindex="-1">Acorn</li>
<li id="ambercup" role="treeitem" tabindex="-1">Ambercup</li>
<li id="autumn_cup" role="treeitem" tabindex="-1">Autumn Cup</li>
<li id="hubbard" role="treeitem" tabindex="-1">Hubbard</li>
<li id="kobacha" role="treeitem" tabindex="-1">Kabocha</li>
<li id="butternut" role="treeitem" tabindex="-1">Butternut</li>
<li id="spaghetti" role="treeitem" tabindex="-1">Spaghetti</li>
<li id="sweet_dumpling" role="treeitem" tabindex="-1">Sweet Dumpling</li>
<li id="turban" role="treeitem" tabindex="-1">Turban</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<script>
$(document).ready(function() {
var treeviewApp = new treeview('tree1');
}); // end ready
//
// Function treeview() is a class constructor for a treeview widget. The widget binds to an
// unordered list. The top-level <ul> must have role='tree'. All list items must have role='treeitem'.
//
// Tree groups must be embedded lists within the listitem that heads the group. the top <ul> of a group
// must have role='group'. aria-expanded is used to indicate whether a group is expanded or collapsed. This
// property must be set on the listitem the encapsulates the group.
//
// parent nodes must be given the class tree-parent.
//
// @param (treeID string) treeID is the html id of the top-level <ul> of the list to bind the widget to
//
// @return N/A
//
function treeview(treeID) {
// define the object properties
this.$id = $('#' + treeID);
this.$items = this.$id.find('li'); // jQuery array of list items
this.$parents = this.$id.find('.tree-parent'); // jQuery array of parent nodes
this.$visibleItems = null; // holds a jQuery array of the currently visible items in the tree
this.$activeItem = null; // holds the jQuery object for the active item
this.keys = {
tab: 9,
enter: 13,
space: 32,
pageup: 33,
pagedown: 34,
end: 35,
home: 36,
left: 37,
up: 38,
right: 39,
down: 40,
asterisk: 106
};
// initialize the treeview
this.init();
// bind event handlers
this.bindHandlers();
} // end treeview() constructor
//
// Function init() is a member function to initialize the treeview widget. It traverses the tree, identifying
// which listitems are headers for groups and applying initial collapsed are expanded styling
//
// @return N/A
//
treeview.prototype.init = function() {
// insert the header image. Note: this method allows the widget to degrade gracefully
// if javascript is disabled or there is some other error.
this.$parents.prepend('<img class="headerImg" src="http://www.oaa-accessibility.org/media/examples/images/expanded.gif" alt="Group expanded"/>');
// If the aria-expanded is false, hide the group and display the collapsed state image
this.$parents.each(function() {
if ($(this).attr('aria-expanded') == 'false') {
$(this).children('ul').hide().attr('aria-hidden', 'true');
$(this).children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/contracted.gif').attr('alt', 'Group collapsed');
}
});
this.$visibleItems = this.$id.find('li:visible');
} // end init()
//
// Function expandGroup() is a member function to expand a collapsed group
//
// @param($item object) $item is the jquery id of the parent item of the group
//
// @param(hasFocus boolean) hasFocus is true if the parent has focus, false otherwise
//
// @return N/A
//
treeview.prototype.expandGroup = function($item, hasFocus) {
var $group = $item.children('ul'); // find the first child ul node
// expand the group
$group.show().attr('aria-hidden', 'false');
// set the aria-expanded property
$item.attr('aria-expanded', 'true');
if (hasFocus == true) {
$item.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/expanded-focus.gif').attr('alt', 'Group expanded');
}
else {
$item.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/expanded.gif').attr('alt', 'Group expanded');
}
// update the list of visible items
this.$visibleItems = this.$id.find('li:visible');
} // end expandGroup()
//
// Function collapseGroup() is a member function to collapse an expanded group
//
// @param($item object) $item is the jquery id of the parent item of the group to collapse
//
// @param(hasFocus boolean) hasFocus is true if the parent item has focus, false otherwise
//
// @return N/A
//
treeview.prototype.collapseGroup = function($item, hasFocus) {
var $group = $item.children('ul');
// collapse the group
$group.hide().attr('aria-hidden', 'true');
// update the aria-expanded property
$item.attr('aria-expanded', 'false');
if (hasFocus == true) {
$item.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/contracted-focus.gif').attr('alt', 'Group collapsed');
}
else {
$item.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/contracted.gif').attr('alt', 'Group collapsed');
}
// update the list of visible items
this.$visibleItems = this.$id.find('li:visible');
} // end collapseGroup()
//
// Function toggleGroup() is a member function to toggle the display state of a group
//
// @param($item object) $item is the jquery id of the parent item of the group to toggle
//
// @param(hasFocus boolean) hasFocus is true if the parent item has focus, false otherwise
//
// @return N/A
//
treeview.prototype.toggleGroup = function($item, hasFocus) {
var $group = $item.children('ul');
if ($item.attr('aria-expanded') == 'true') {
// collapse the group
this.collapseGroup($item, hasFocus);
}
else {
// expand the group
this.expandGroup($item, hasFocus);
}
} // end toggleGroup()
//
// Function bindHandlers() is a member function to bind event handlers to the listitems
//
// return N/A
//
treeview.prototype.bindHandlers = function() {
var thisObj = this;
// bind a dblclick handler to the parent items
this.$parents.dblclick(function(e) {
return thisObj.handleDblClick($(this), e);
});
// bind a click handler
this.$items.click(function(e) {
return thisObj.handleClick($(this), e);
});
// bind a keydown handler
this.$items.keydown(function(e) {
return thisObj.handleKeyDown($(this), e);
});
// bind a keypress handler
this.$items.keypress(function(e) {
return thisObj.handleKeyPress($(this), e);
});
// bind a focus handler
this.$items.focus(function(e) {
return thisObj.handleFocus($(this), e);
});
// bind a blur handler
this.$items.blur(function(e) {
return thisObj.handleBlur($(this), e);
});
// bind a document click handler
$(document).click(function(e) {
if (thisObj.$activeItem != null) {
// remove the focus styling
thisObj.$activeItem.removeClass('tree-focus');
if (thisObj.$activeItem.hasClass('tree-parent') == true) {
// this is a parent item, remove the focus image
if (thisObj.$activeItem.attr('aria-expanded') == 'true') {
thisObj.$activeItem.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/expanded.gif');
}
else {
thisObj.$activeItem.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/contracted.gif');
}
}
// set activeItem to null
thisObj.$activeItem = null;
}
return true;
});
} // end bindHandlers()
//
// Function updateStyling() is a member function to update the styling for the tree items
//
// @param ($item object) $item is the jQuery object of the item to highlight
//
// @return N/A
//
treeview.prototype.updateStyling = function($item) {
// remove the focus and highlighting from the treeview items
// and remove them from the tab order.
this.$items.removeClass('tree-focus').attr('tabindex', '-1');
// remove the focus image from other parents
this.$parents.each(function() {
// remove the focus image
if ($(this).attr('aria-expanded') == 'true') {
$(this).children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/expanded.gif');
}
else {
$(this).children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/contracted.gif');
}
});
// add the focus image to the current parent
if ($item.is('.tree-parent')) {
if ($item.attr('aria-expanded') == 'true') {
$item.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/expanded-focus.gif');
}
else {
$item.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/contracted-focus.gif');
}
}
// apply the focus and styling and place the element in the tab order
$item.addClass('tree-focus').attr('tabindex', '0');
} // end updateStyling()
//
// Function handleKeyDown() is a member function to process keydown events for the treeview items
//
// @param ($item object) $id is the jQuery id of the item firing the event
//
// @param (e object) e is the associated event object
//
// @return (boolean) returns false if consuming event; true if not
//
treeview.prototype.handleKeyDown = function($item, e) {
var curNdx = this.$visibleItems.index($item);
if ((e.altKey || e.ctrlKey)
|| (e.shiftKey && e.keyCode != this.keys.tab)) {
// do nothing
return true;
}
switch (e.keyCode) {
case this.keys.tab: {
// set activeItem to null
this.$activeItem = null;
// remove the focus styling
$item.removeClass('tree-focus');
if ($item.hasClass('tree-parent') == true) {
// this is a parent item, remove the focus image
if ($item.attr('aria-expanded') == 'true') {
$item.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/expanded.gif');
}
else {
$item.children('img').attr('src', 'http://www.oaa-accessibility.org/media/examples/images/contracted.gif');
}
}
return true;
}
case this.keys.home: { // jump to first item in tree
// store the active item
this.$activeItem = this.$parents.first();
// set focus on the active item
this.$activeItem.focus();
e.stopPropagation();
return false;
}
case this.keys.end: { // jump to last visible item
// store the active item
this.$activeItem = this.$visibleItems.last();
// set focus on the active item
this.$activeItem.focus();
e.stopPropagation();
return false;
}
case this.keys.enter:
case this.keys.space: {
if (!$item.is('.tree-parent')) {
// do nothing
}
else {
// toggle the child group open or closed
this.toggleGroup($item, true);
}
e.stopPropagation();
return false;
}
case this.keys.left: {
if ($item.is('.tree-parent') && $item.attr('aria-expanded') == 'true') {
// collapse the group and return
this.collapseGroup($item, true);
}
else {
// move up to the parent
var $itemUL = $item.parent();
var $itemParent = $itemUL.parent();
// store the active item
this.$activeItem = $itemParent;
// set focus on the parent
this.$activeItem.focus();
}
e.stopPropagation();
return false;
}
case this.keys.right: {
if (!$item.is('.tree-parent')) {
// do nothing
}
else if ($item.attr('aria-expanded') == 'false') {
this.expandGroup($item, true);
}
else {
// move to the first item in the child group
this.$activeItem = $item.children('ul').children('li').first();
this.$activeItem.focus();
}
e.stopPropagation();
return false;
}
case this.keys.up: {
if (curNdx > 0) {
var $prev = this.$visibleItems.eq(curNdx - 1);
// store the active item
this.$activeItem = $prev;
$prev.focus();
}
e.stopPropagation();
return false;
}
case this.keys.down: {
if (curNdx < this.$visibleItems.length - 1) {
var $next = this.$visibleItems.eq(curNdx + 1);
// store the active item
this.$activeItem = $next;
$next.focus();
}
e.stopPropagation();
return false;
}
case this.keys.asterisk: {
// expand all groups
var thisObj = this;
this.$parents.each(function() {
if (thisObj.$activeItem[0] == $(this)[0]) {
thisObj.expandGroup($(this), true);
}
else {
thisObj.expandGroup($(this), false);
}
});
e.stopPropagation();
return false;
}
}
return true;
} // end handleKeyDown
//
// Function handleKeyPress() is a member function to process keypress events for the treeview items
// This function is needed for browsers, such as Opera, that perform window manipulation on kepress events
// rather than keydown. The function simply consumes the event.
//
// @param ($item object) $id is the jQuery id of the parent item firing event
//
// @param (e object) e is the associated event object
//
// @return (boolean) returns false if consuming event; true if not
//
treeview.prototype.handleKeyPress = function($item, e) {
if (e.altKey || e.ctrlKey || e.shiftKey) {
// do nothing
return true;
}
switch (e.keyCode) {
case this.keys.tab: {
return true;
}
case this.keys.enter:
case this.keys.home:
case this.keys.end:
case this.keys.left:
case this.keys.right:
case this.keys.up:
case this.keys.down: {
e.stopPropagation();
return false;
}
default : {
var chr = String.fromCharCode(e.which);
var bMatch = false;
var itemNdx = this.$visibleItems.index($item);
var itemCnt = this.$visibleItems.length;
var curNdx = itemNdx + 1;
// check if the active item was the last one on the list
if (curNdx == itemCnt) {
curNdx = 0;
}
// Iterate through the menu items (starting from the current item and wrapping) until a match is found
// or the loop returns to the current menu item
while (curNdx != itemNdx) {
var $curItem = this.$visibleItems.eq(curNdx);
var titleChr = $curItem.text().charAt(0);
if ($curItem.is('.tree-parent')) {
titleChr = $curItem.find('span').text().charAt(0);
}
if (titleChr.toLowerCase() == chr) {
bMatch = true;
break;
}
curNdx = curNdx+1;
if (curNdx == itemCnt) {
// reached the end of the list, start again at the beginning
curNdx = 0;
}
}
if (bMatch == true) {
this.$activeItem = this.$visibleItems.eq(curNdx);
this.$activeItem.focus();
}
e.stopPropagation();
return false;
}
}
return true;
} // end handleKeyPress
//
// Function handleDblClick() is a member function to process double-click events for parent items.
// Double-click expands or collapses a group.
//
// @param ($id object) $item is the jQuery object of the tree parent item firing event
//
// @param (e object) e is the associated event object
//
// @return (boolean) returns false if consuming event; true if not
//
treeview.prototype.handleDblClick = function($id, e) {
if (e.altKey || e.ctrlKey || e.shiftKey) {
// do nothing
return true;
}
// update the active item
this.$activeItem = $id;
// apply the focus highlighting
this.updateStyling($id);
// expand or collapse the group
this.toggleGroup($id, true);
e.stopPropagation();
return false;
} // end handleDblClick
//
// Function handleClick() is a member function to process click events.
//
// @param ($id object) $id is the jQuery id of the parent item firing event
//
// @param (e object) e is the associated event object
//
// @return (boolean) returns false if consuming event; true if not
//
treeview.prototype.handleClick = function($id, e) {
if (e.altKey || e.ctrlKey || e.shiftKey) {
// do nothing
return true;
}
// update the active item
this.$activeItem = $id;
// apply the focus highlighting
this.updateStyling($id);
e.stopPropagation();
return false;
} // end handleClick
//
// Function handleFocus() is a member function to process focus events.
//
// @param ($item object) $item is the jQuery id of the parent item firing event
//
// @param (e object) e is the associated event object
//
// @return (boolean) returns true
//
treeview.prototype.handleFocus = function($item, e) {
if (this.$activeItem == null) {
this.$activeItem = $item;
}
this.updateStyling(this.$activeItem);
return true;
} // end handleFocus
//
// Function handleBlur() is a member function to process blur events.
//
// @param ($id object) $id is the jQuery id of the parent item firing event
//
// @param (e object) e is the associated event object
//
// @return (boolean) returns true
//
treeview.prototype.handleBlur = function($id, e) {
return true;
} // end handleBlur
</script>
</body>
</html>