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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Simple Storage Example — Saving In-Progress Text Entry</title>
<style type="text/css">
/*margin and padding on body element
can introduce errors in determining
element position and are not recommended;
we turn them off as a foundation for YUI
CSS treatments. */
body {
margin:0;
padding:0;
}
</style>
<link rel="stylesheet" type="text/css" href="../../build/fonts/fonts-min.css" />
<script type="text/javascript" src="../../build/yahoo-dom-event/yahoo-dom-event.js"></script>
<script type="text/javascript" src="../../build/element/element-min.js"></script>
<script type="text/javascript" src="../../build/cookie/cookie-min.js"></script>
<script type="text/javascript" src="../../build/swf/swf-min.js"></script>
<script type="text/javascript" src="../../build/swfstore/swfstore-min.js"></script>
<script type="text/javascript" src="../../build/storage/storage-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css">
#textentry {
height:100px;
width:400px;
background-color:#dedede;
color:#2D119F;
font-weight:bold;
}
#autosave {
margin-top: 5px;
font-size: 10px;
color: #666666;
}
</style>
<!--end custom header content for this example-->
</head>
<body class="yui-skin-sam">
<h1>Simple Storage Example — Saving In-Progress Text Entry</h1>
<div class="exampleIntro">
<p>This example demonstrates a rudimentary use case for the <a href="http://developer.yahoo.com/yui/storage/">Storage Utility</a>. When you enter text in the text field below, your content will be locally saved on every fifth <code>keypress</code>. If your browser supports one of the Storage Utility's storage mechanisms (Gears, SWF, and HTML5 are tried, in that order), your last-saved content will persist when you reload the page.</p>
<p>Watch the logger on the right side of the page as you type for feedback about what the example is doing.</p>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<form action="." method="post" id="textentryform">
<textarea id="textentry">Text entered here will be autosaved as you type.</textarea>
<p id="autosave">#</p>
</form>
<!--Always include gears_init.js when you want to support Google Gears:-->
<script type="text/javascript" src="../storage/assets/gears_init.js"></script>
<script language="javascript">
YAHOO.util.Event.onDOMReady(function() {
var ctr = 0,
storageEngine;
YAHOO.util.StorageEngineSWF.SWFURL = 'swfstore.swf';
//wrap instantiation in a try/catch to handle situations where
//the client browser does not support any of your desired
//storage engines; use the catch statement to handle those
//unsupported browsers. In this case, we're using Storage as
//an enhancement, and we can fail gracefully if instantiation
//fails.
try {
storageEngine = YAHOO.util.StorageManager.get(
YAHOO.util.StorageEngineGears.ENGINE_NAME,
YAHOO.util.StorageManager.LOCATION_LOCAL,
{
order: [
YAHOO.util.StorageEngineGears,
YAHOO.util.StorageEngineSWF,
YAHOO.util.StorageEngineHTML5
],
force: false
}
);
} catch(e) {
YAHOO.log("No supported storage mechanism present.");
storageEngine = false;
}
//storageEngine will be truthy if instantiation succeeded and
//false if no engine was available or if instantiation failed
//for any reason.
if(storageEngine) {
//If we got a valid storage engine, we can make use of it.
//Use the custom event CE_READY to identify the moment
storageEngine.subscribe(storageEngine.CE_READY, function(e) {
YAHOO.log("A Storage instance is ready using " +
storageEngine.getName() +
"; start typing in the text box and content will be saved every five keystrokes.", "info", "example");
//Prepopulate the text field with saved contents, if present.
if(storageEngine.hasKey("simple-storage-textentry")) {
YAHOO.log(storageEngine.getItem("simple-storage-textentry"));
YAHOO.util.Dom.get("textentry").value = storageEngine.getItem("simple-storage-textentry");
}
//Set up an event listener to trigger the Storage set method
//every five keystrokes.
YAHOO.util.Event.on("textentry", "keypress", function(e) {
ctr++;
if(!(ctr%5)) { //on every fifth keystroke, autosave the contents
storageEngine.setItem("simple-storage-textentry", YAHOO.util.Dom.get("textentry").value);
document.getElementById("autosave").innerHTML = "last saved at " + (new Date).toString();
YAHOO.log("Autosaved textarea content to " +
storageEngine.getName() + " via Storage Utility.", "info", "example");
}
});
});
}
});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</body>
</html>
|
