--- /dev/null
+<!--
+ This file is a simple loader for the Lazy Load demo of a Datastore. In this
+ Example, a simple extension of ItemFileReadStore that can do rudimentary lazy-loading
+ of items into the store is used to showcase how Datastores can hide how data
+ is loaded from the widget. As long as the widget implements to the Dojo.data API
+ spec, then it should be able to use most datastores as input sources for its
+ values.
+-->
+<html>
+<head>
+ <title>Demo of Lazy Loading Datastore</title>
+ <style type="text/css">
+
+ @import "../../../dijit/themes/tundra/tundra.css";
+ @import "../../../dojo/resources/dojo.css";
+ @import "../../../dijit/tests/css/dijitTests.css";
+ </style>
+
+ <script type="text/javascript" src="../../../dojo/dojo.js" djConfig="isDebug: true, parseOnLoad: true, usePlainJson: true"></script>
+ <script type="text/javascript">
+ dojo.require("dojo.parser");
+ dojo.require("dojox.data.demos.stores.LazyLoadJSIStore");
+ dojo.require("dijit.Tree");
+ </script>
+</head>
+
+<body class="tundra">
+ <h1>
+ DEMO: Lazy Loading Datastore used by dijit.Tree
+ </h1>
+ <hr>
+ <h3>
+ Description:
+ </h3>
+ <p>
+ This simple demo shows how the dijit.Tree widget can work with a Datastore that does lazy-loading of values into the tree.
+ In this demo, the Datastore is an extension of ItemFileReadStore that overrides the <i>isItemLoaded()</i> and <i>loadItem()</i> functions of
+ with ones that can detect 'stub' items and use the data in the stub item to load the real data for that item when it
+ is required. In this demo, the real data is required when one of the tree nodes is expanded.
+ </p>
+ <p>
+ The key thing to note is that all the lazy-loading logic (how to locate the data from the backend and so forth) is encapsulated
+ into the store functions. The dijit.Tree widget only knows about and uses the dojo.data.Read API interfaces to call to the store to
+ get items, test if child items are fully loaded or not, and to invoke the <i>loadItem()</i> function on items that are not yet fully
+ loaded but have been requested to be expanded into view. It has no knowledge of how the store actually goes and gets the data.
+ </p>
+
+ <blockquote>
+
+ <!--
+ The store instance used by this demo.
+ -->
+ <div dojoType="dojox.data.demos.stores.LazyLoadJSIStore" jsId="continentStore"
+ url="geography/root.json"></div>
+
+ <!--
+ Display the toplevel tree with items that have an attribute of 'type',
+ with value of 'contintent'
+ -->
+ <b>Continents</b>
+ <div dojoType="dijit.Tree" id=tree label="Continents" store="continentStore" query="{type:'continent'}"
+ labelAttr="name" typeAttr="type"></div>
+ </blockquote>
+
+</body>
+</html>
projects / eow / blobdiff