webgui/www/extras/yui/examples/treeview/tasklist.html
JT Smith 20f8df1291 upgrading to YUI 2.6
data tables are going to need some work yet, but the other stuff seems to be working 100%
2008-10-22 23:53:29 +00:00

576 lines
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<title>YUI Library Examples: TreeView Control: Custom TreeView with Check Boxes</title>
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<script type="text/javascript">
//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
YAHOO.util.Event.throwErrors = true;
}
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<div id="pagetitle"><h1>YUI Library Examples: TreeView Control: Custom TreeView with Check Boxes</h1></div>
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<div class="yui-u first example">
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<h1>TreeView Control: Custom TreeView with Check Boxes</h1>
<div class="exampleIntro">
<p>The TaskNode example implements a task list using treeview. It does so by extending the TextNode class to have additional, specific functionality. In this example, each TaskNode has three potential states: Checked, partially-checked (not all subtasks complete), and unchecked. Checking off a task automatically checks off all subtasks.</p>
</div>
<div class="example-container module ">
<div id="example-canvas" class="bd">
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<!-- Some style for the expand/contract section-->
<style>
#expandcontractdiv {border:1px solid #336600; background-color:#FFFFCC; margin:0 0 .5em 0; padding:0.2em;}
#treeDiv1 { background: #fff }
</style>
<!-- markup for expand/contract links -->
<div id="expandcontractdiv">
<a id="expand" href="#">Expand all</a>
<a id="collapse" href="#">Collapse all</a>
<a id="check" href="#">Check all</a>
<a id="uncheck" href="#">Uncheck all</a>
<a id="getchecked" href="#">Log array of checked nodes</a>
</div>
<div id="treeDiv1"></div>
<script type="text/javascript" src="assets/js/TaskNode.js"></script>
<script type="text/javascript">
(function() {
var tree;
var nodes = [];
var nodeIndex;
function treeInit() {
YAHOO.log("Initializing TaskNode TreeView instance.")
buildRandomTaskNodeTree();
}
//handler for expanding all nodes
YAHOO.util.Event.on("expand", "click", function(e) {
YAHOO.log("Expanding all TreeView nodes.", "info", "example");
tree.expandAll();
YAHOO.util.Event.preventDefault(e);
});
//handler for collapsing all nodes
YAHOO.util.Event.on("collapse", "click", function(e) {
YAHOO.log("Collapsing all TreeView nodes.", "info", "example");
tree.collapseAll();
YAHOO.util.Event.preventDefault(e);
});
//handler for checking all nodes
YAHOO.util.Event.on("check", "click", function(e) {
YAHOO.log("Checking all TreeView nodes.", "info", "example");
checkAll();
YAHOO.util.Event.preventDefault(e);
});
//handler for unchecking all nodes
YAHOO.util.Event.on("uncheck", "click", function(e) {
YAHOO.log("Unchecking all TreeView nodes.", "info", "example");
uncheckAll();
YAHOO.util.Event.preventDefault(e);
});
YAHOO.util.Event.on("getchecked", "click", function(e) {
YAHOO.log("Checked nodes: " + YAHOO.lang.dump(getCheckedNodes()), "info", "example");
YAHOO.util.Event.preventDefault(e);
});
//Function creates the tree and
//builds between 3 and 7 children of the root node:
function buildRandomTaskNodeTree() {
//instantiate the tree:
tree = new YAHOO.widget.TreeView("treeDiv1");
for (var i = 0; i < Math.floor((Math.random()*4) + 3); i++) {
var tmpNode = new YAHOO.widget.TaskNode("label-" + i, tree.getRoot(), false);
// tmpNode.collapse();
// tmpNode.expand();
buildRandomTaskBranch(tmpNode);
}
// Expand and collapse happen prior to the actual expand/collapse,
// and can be used to cancel the operation
tree.subscribe("expand", function(node) {
YAHOO.log(node.index + " was expanded", "info", "example");
// return false; // return false to cancel the expand
});
tree.subscribe("collapse", function(node) {
YAHOO.log(node.index + " was collapsed", "info", "example");
});
// Trees with TextNodes will fire an event for when the label is clicked:
tree.subscribe("labelClick", function(node) {
YAHOO.log(node.index + " label was clicked", "info", "example");
});
// Trees with TaskNodes will fire an event for when a check box is clicked
tree.subscribe("checkClick", function(node) {
YAHOO.log(node.index + " check was clicked", "info", "example");
});
tree.subscribe("clickEvent", function(node) {
YAHOO.log(node.index + " clickEvent", "info", "example");
});
//The tree is not created in the DOM until this method is called:
tree.draw();
}
var callback = null;
function buildRandomTaskBranch(node) {
if (node.depth < 5) {
YAHOO.log("buildRandomTextBranch: " + node.index);
for ( var i = 0; i < Math.floor(Math.random() * 4) ; i++ ) {
var tmpNode = new YAHOO.widget.TaskNode(node.label + "-" + i, node, false);
//tmpNode.onCheckClick = onCheckClick;
buildRandomTaskBranch(tmpNode);
}
}
}
function onCheckClick(node) {
YAHOO.log(node.label + " check was clicked, new state: " +
node.checkState, "info", "example");
}
function checkAll() {
var topNodes = tree.getRoot().children;
for(var i=0; i<topNodes.length; ++i) {
topNodes[i].check();
}
}
function uncheckAll() {
var topNodes = tree.getRoot().children;
for(var i=0; i<topNodes.length; ++i) {
topNodes[i].uncheck();
}
}
// Gets the labels of all of the fully checked nodes
// Could be updated to only return checked leaf nodes by evaluating
// the children collection first.
function getCheckedNodes(nodes) {
nodes = nodes || tree.getRoot().children;
checkedNodes = [];
for(var i=0, l=nodes.length; i<l; i=i+1) {
var n = nodes[i];
//if (n.checkState > 0) { // if we were interested in the nodes that have some but not all children checked
if (n.checkState === 2) {
checkedNodes.push(n.label); // just using label for simplicity
}
if (n.hasChildren()) {
checkedNodes = checkedNodes.concat(getCheckedNodes(n.children));
}
}
return checkedNodes;
}
YAHOO.util.Event.onDOMReady(treeInit);
})();
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<h2 class="first">The TaskNode Subclass</h2>
<p>This example explores the extension of TreeView via a subclass of the TextNode class. The full source of the TaskNode subclass follows:</p>
<textarea name="code" class="JScript" cols="60" rows="1">/**
* The check box marks a task complete. It is a simulated form field
* with three states ...
* 0=unchecked, 1=some children checked, 2=all children checked
* When a task is clicked, the state of the nodes and parent and children
* are updated, and this behavior cascades.
*
* @extends YAHOO.widget.TextNode
* @constructor
* @param oData {object} A string or object containing the data that will
* be used to render this node.
* @param oParent {Node} This node's parent node
* @param expanded {boolean} The initial expanded/collapsed state
* @param checked {boolean} The initial checked/unchecked state
*/
YAHOO.widget.TaskNode = function(oData, oParent, expanded, checked) {
YAHOO.widget.TaskNode.superclass.constructor.call(this,oData,oParent,expanded);
this.setUpCheck(checked || oData.checked);
};
YAHOO.extend(YAHOO.widget.TaskNode, YAHOO.widget.TextNode, {
/**
* True if checkstate is 1 (some children checked) or 2 (all children checked),
* false if 0.
* @type boolean
*/
checked: false,
/**
* checkState
* 0=unchecked, 1=some children checked, 2=all children checked
* @type int
*/
checkState: 0,
/**
* The node type
* @property _type
* @private
* @type string
* @default "TextNode"
*/
_type: "TaskNode",
taskNodeParentChange: function() {
//this.updateParent();
},
setUpCheck: function(checked) {
// if this node is checked by default, run the check code to update
// the parent's display state
if (checked && checked === true) {
this.check();
// otherwise the parent needs to be updated only if its checkstate
// needs to change from fully selected to partially selected
} else if (this.parent && 2 === this.parent.checkState) {
this.updateParent();
}
// set up the custom event on the tree for checkClick
/**
* Custom event that is fired when the check box is clicked. The
* custom event is defined on the tree instance, so there is a single
* event that handles all nodes in the tree. The node clicked is
* provided as an argument. Note, your custom node implentation can
* implement its own node specific events this way.
*
* @event checkClick
* @for YAHOO.widget.TreeView
* @param {YAHOO.widget.Node} node the node clicked
*/
if (this.tree && !this.tree.hasEvent("checkClick")) {
this.tree.createEvent("checkClick", this.tree);
}
this.tree.subscribe('clickEvent',this.checkClick);
this.subscribe("parentChange", this.taskNodeParentChange);
},
/**
* The id of the check element
* @for YAHOO.widget.TaskNode
* @type string
*/
getCheckElId: function() {
return "ygtvcheck" + this.index;
},
/**
* Returns the check box element
* @return the check html element (img)
*/
getCheckEl: function() {
return document.getElementById(this.getCheckElId());
},
/**
* The style of the check element, derived from its current state
* @return {string} the css style for the current check state
*/
getCheckStyle: function() {
return "ygtvcheck" + this.checkState;
},
/**
* Invoked when the user clicks the check box
*/
checkClick: function(oArgs) {
var node = oArgs.node;
var target = YAHOO.util.Event.getTarget(oArgs.event);
if (YAHOO.util.Dom.hasClass(target,'ygtvspacer')) {
node.logger.log("previous checkstate: " + node.checkState);
if (node.checkState === 0) {
node.check();
} else {
node.uncheck();
}
node.onCheckClick(node);
this.fireEvent("checkClick", node);
return false;
}
},
/**
* Override to get the check click event
*/
onCheckClick: function() {
this.logger.log("onCheckClick: " + this);
},
/**
* Refresh the state of this node's parent, and cascade up.
*/
updateParent: function() {
var p = this.parent;
if (!p || !p.updateParent) {
this.logger.log("Abort udpate parent: " + this.index);
return;
}
var somethingChecked = false;
var somethingNotChecked = false;
for (var i=0, l=p.children.length;i<l;i=i+1) {
var n = p.children[i];
if ("checked" in n) {
if (n.checked) {
somethingChecked = true;
// checkState will be 1 if the child node has unchecked children
if (n.checkState === 1) {
somethingNotChecked = true;
}
} else {
somethingNotChecked = true;
}
}
}
if (somethingChecked) {
p.setCheckState( (somethingNotChecked) ? 1 : 2 );
} else {
p.setCheckState(0);
}
p.updateCheckHtml();
p.updateParent();
},
/**
* If the node has been rendered, update the html to reflect the current
* state of the node.
*/
updateCheckHtml: function() {
if (this.parent && this.parent.childrenRendered) {
this.getCheckEl().className = this.getCheckStyle();
}
},
/**
* Updates the state. The checked property is true if the state is 1 or 2
*
* @param the new check state
*/
setCheckState: function(state) {
this.checkState = state;
this.checked = (state > 0);
},
/**
* Check this node
*/
check: function() {
this.logger.log("check");
this.setCheckState(2);
for (var i=0, l=this.children.length; i<l; i=i+1) {
var c = this.children[i];
if (c.check) {
c.check();
}
}
this.updateCheckHtml();
this.updateParent();
},
/**
* Uncheck this node
*/
uncheck: function() {
this.setCheckState(0);
for (var i=0, l=this.children.length; i<l; i=i+1) {
var c = this.children[i];
if (c.uncheck) {
c.uncheck();
}
}
this.updateCheckHtml();
this.updateParent();
},
// Overrides YAHOO.widget.TextNode
getContentHtml: function() {
var sb = [];
sb[sb.length] = '<td';
sb[sb.length] = ' id="' + this.getCheckElId() + '"';
sb[sb.length] = ' class="' + this.getCheckStyle() + '"';
sb[sb.length] = '>';
sb[sb.length] = '<div class="ygtvspacer"></div></td>';
sb[sb.length] = '<td><span';
sb[sb.length] = ' id="' + this.labelElId + '"';
if (this.title) {
sb[sb.length] = ' title="' + this.title + '"';
}
sb[sb.length] = ' class="' + this.labelStyle + '"';
sb[sb.length] = ' >';
sb[sb.length] = this.label;
sb[sb.length] = '</span></td>';
return sb.join("");
}
});</textarea>
</div>
<div class="yui-u">
<div id="loggerModule" class="yui-skin-sam">
<h3 class="firstContent">YUI Logger Output:</h3>
<div id="loggerDiv"></div>
</div>
<div id="examples">
<h3>TreeView Control Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../treeview/default_tree.html'>Default TreeView</a></li><li><a href='../treeview/dynamic_tree.html'>Dynamically Loading Node Data</a></li><li><a href='../treeview/folder_style.html'>Folder-Style TreeView Design</a></li><li><a href='../treeview/menu_style.html'>Menu-Style TreeView Design</a></li><li><a href='../treeview/customicons.html'>Using TreeView with Custom Icons</a></li><li class='selected'><a href='../treeview/tasklist.html'>Custom TreeView with Check Boxes</a></li><li><a href='../treeview/tv_tooltip.html'>TreeView with Tooltips</a></li><li><a href='../treeview/tv-markup.html'>Three Ways to Define a TreeView: Markup (Progressive Enhancement), Existing TreeView Instance, and Object Literal </a></li><li><a href='../treeview/tv-edit.html'>Inline Editing of TreeView Node Labels</a></li><li><a href='../menu/treeviewcontextmenu.html'>Adding A Context Menu To A TreeView (included with examples for Menu Family)</a></li> </ul>
</div>
</div>
<div id="module">
<h3>More TreeView Control Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/treeview/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_treeview.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/treeview.pdf">Cheat Sheet PDF</a> (external)</li></ul>
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