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338 lines
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HTML
338 lines
21 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>YUI Library Examples: Storage Utility: Simple Storage Example — Saving In-Progress Text Entry</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >
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<style>
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/*Supplemental CSS for the YUI distribution*/
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#custom-doc { width: 95%; min-width: 950px; }
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#pagetitle {background-image: url(../../assets/bg_hd.gif);}
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</style>
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<link rel="stylesheet" type="text/css" href="../../assets/dpSyntaxHighlighter.css">
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<!--Script and CSS includes for YUI dependencies on this page-->
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<link rel="stylesheet" type="text/css" href="../../build/logger/assets/skins/sam/logger.css" />
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<link rel="stylesheet" type="text/css" href="../../build/button/assets/skins/sam/button.css" />
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<script type="text/javascript" src="../../build/yuiloader/yuiloader-min.js"></script>
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<script type="text/javascript" src="../../build/event/event-min.js"></script>
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<script type="text/javascript" src="../../build/dom/dom-min.js"></script>
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<script type="text/javascript" src="../../build/logger/logger-min.js"></script>
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<script type="text/javascript" src="../../build/element/element-min.js"></script>
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<script type="text/javascript" src="../../build/cookie/cookie-min.js"></script>
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<script type="text/javascript" src="../../build/swf/swf-min.js"></script>
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<script type="text/javascript" src="../../build/swfstore/swfstore-min.js"></script>
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<script type="text/javascript" src="../../build/storage/storage-debug.js"></script>
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<script type="text/javascript" src="../../build/button/button-min.js"></script>
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<!--begin custom header content for this example-->
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<style type="text/css">
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#textentry {
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height:100px;
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width:400px;
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background-color:#dedede;
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color:#2D119F;
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font-weight:bold;
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}
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#autosave {
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margin-top: 5px;
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font-size: 10px;
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color: #666666;
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}
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</style>
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<!--end custom header content for this example-->
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<script type="text/javascript">
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//enable passthrough of errors from YUI Event:
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if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
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YAHOO.util.Event.throwErrors = true;
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}
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</script>
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</head>
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<body id="yahoo-com" class="yui-skin-sam">
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<div id="custom-doc" class="yui-t2">
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<div id="hd">
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<div id="ygunav">
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<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
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<form action="http://search.yahoo.com/search" id="sitesearchform">
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<input name="vs" type="hidden" value="developer.yahoo.com">
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<input name="vs" type="hidden" value="yuiblog.com">
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<div id="sitesearch">
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<label for="searchinput">Site Search (YDN & YUIBlog): </label>
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<input type="text" id="searchinput" name="p">
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<input type="submit" value="Search" id="searchsubmit" class="ygbt">
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</div>
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</form> </div>
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<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
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<div id="pagetitle"><h1>YUI Library Examples: Storage Utility: Simple Storage Example — Saving In-Progress Text Entry</h1></div>
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</div>
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<div id="bd">
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<div id="yui-main">
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<div class="yui-b">
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<div class="yui-ge">
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<div class="yui-u first example">
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<div class="promo">
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<h1>Storage Utility: Simple Storage Example — Saving In-Progress Text Entry</h1>
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<div class="exampleIntro">
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<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>
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<p>Watch the logger on the right side of the page as you type for feedback about what the example is doing.</p>
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</div>
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<div class="example-container module ">
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<div class="hd exampleHd">
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<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="storage-simple_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
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</div> <div id="example-canvas" class="bd">
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
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<form action="." method="post" id="textentryform">
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<textarea id="textentry">Text entered here will be autosaved as you type.</textarea>
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<p id="autosave">#</p>
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</form>
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<!--Always include gears_init.js when you want to support Google Gears:-->
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<script type="text/javascript" src="../storage/assets/gears_init.js"></script>
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<script language="javascript">
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YAHOO.util.Event.onDOMReady(function() {
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var ctr = 0,
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storageEngine;
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YAHOO.util.StorageEngineSWF.SWFURL = 'swfstore.swf';
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//wrap instantiation in a try/catch to handle situations where
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//the client browser does not support any of your desired
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//storage engines; use the catch statement to handle those
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//unsupported browsers. In this case, we're using Storage as
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//an enhancement, and we can fail gracefully if instantiation
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//fails.
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try {
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storageEngine = YAHOO.util.StorageManager.get(
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YAHOO.util.StorageEngineGears.ENGINE_NAME,
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YAHOO.util.StorageManager.LOCATION_LOCAL,
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{
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order: [
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YAHOO.util.StorageEngineGears,
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YAHOO.util.StorageEngineSWF,
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YAHOO.util.StorageEngineHTML5
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],
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force: false
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}
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);
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} catch(e) {
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YAHOO.log("No supported storage mechanism present.");
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storageEngine = false;
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}
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//storageEngine will be truthy if instantiation succeeded and
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//false if no engine was available or if instantiation failed
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//for any reason.
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if(storageEngine) {
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//If we got a valid storage engine, we can make use of it.
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//Use the custom event CE_READY to identify the moment
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storageEngine.subscribe(storageEngine.CE_READY, function(e) {
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YAHOO.log("A Storage instance is ready using " +
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storageEngine.getName() +
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"; start typing in the text box and content will be saved every five keystrokes.", "info", "example");
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//Prepopulate the text field with saved contents, if present.
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if(storageEngine.hasKey("simple-storage-textentry")) {
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YAHOO.log(storageEngine.getItem("simple-storage-textentry"));
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YAHOO.util.Dom.get("textentry").value = storageEngine.getItem("simple-storage-textentry");
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}
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//Set up an event listener to trigger the Storage set method
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//every five keystrokes.
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YAHOO.util.Event.on("textentry", "keypress", function(e) {
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ctr++;
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if(!(ctr%5)) { //on every fifth keystroke, autosave the contents
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storageEngine.setItem("simple-storage-textentry", YAHOO.util.Dom.get("textentry").value);
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document.getElementById("autosave").innerHTML = "last saved at " + (new Date).toString();
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YAHOO.log("Autosaved textarea content to " +
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storageEngine.getName() + " via Storage Utility.", "info", "example");
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}
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});
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});
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}
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});
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</script>
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<!--END SOURCE CODE FOR EXAMPLE =============================== -->
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</div>
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</div>
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</div>
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<h2 class="first">Getting Started with Storage</h2>
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<p>This example shows Storage being used in a simple context. The full source for the example follows. Of particular interest here is the instantiation of Storage, wrapped in a try/catch statement, where the catch logic handles the logic for browsers that don't support one of your requested storage mechanisms. Because we are allowing SWF storage here, we also wrap the followup logic — the logic that interacts with the fully instantiated Storage object — in the <code>CE_READY</code> custom event, ensuring that we are not trying to interact with the object before it's fully created. (SWFStore has a slight asynchronous delay in instantiation; that's why it's important that we listen for this event when SWF is one of our possible storage mechanisms.)</p><p>In this example, we specify Gears as our preferred storage mechanism and we provide the order in which we want Storage to progress if Gears isn't present — from Gears to SWF to HTML5.</p>
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<p>Note that before the main code block below we have included the <code>gears_init.js</code> file to prepare the page for use of Gears:</p>
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<textarea name="code" class="HTML" cols="60" rows="1">
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<script type="text/javascript" src="../storage/assets/gears_init.js"></script>
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</textarea>
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<p>Here is the main JS codeblock that drives this example, along with some inline comments to explain what's being done and why:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.util.Event.onDOMReady(function() {
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var ctr = 0,
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storageEngine;
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YAHOO.util.StorageEngineSWF.SWFURL = 'swfstore.swf';
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//wrap instantiation in a try/catch to handle situations where
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//the client browser does not support any of your desired
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//storage engine; use the catch statement to handle those
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//unsupported browsers. In this case, we're using Storage as
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//an enhancement, and we can fail gracefully if instantiation
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//fails.
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try {
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storageEngine = YAHOO.util.StorageManager.get(
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YAHOO.util.StorageEngineGears.ENGINE_NAME,
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YAHOO.util.StorageManager.LOCATION_LOCAL,
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{
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order: [
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YAHOO.util.StorageEngineGears,
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YAHOO.util.StorageEngineSWF,
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YAHOO.util.StorageEngineHTML5
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],
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force: false
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}
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);
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} catch(e) {
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YAHOO.log("No supported storage mechanism present.");
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storageEngine = false;
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}
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//storageEngine will be truthy if instantiation succeeded and
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//false if no engine was available or if instantiation failed
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//for any reason.
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if(storageEngine) {
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//If we got a valid storage egnine, we can make use of it.
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//Use the custom event CE_READY to identify the moment
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storageEngine.subscribe(storageEngine.CE_READY, function(e) {
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YAHOO.log("A Storage instance is ready using " +
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storageEngine.getName() +
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"; start typing in the text box and content will be saved every five keystrokes.", "info", "example");
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//Prepopulate the text field with saved contents, if present.
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if(storageEngine.hasKey("simple-storage-textentry")) {
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YAHOO.log(storageEngine.getItem("simple-storage-textentry"));
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YAHOO.util.Dom.get("textentry").value = storageEngine.getItem("simple-storage-textentry");
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}
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//Set up an event listener to trigger the Storage set method
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//every five keystrokes.
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YAHOO.util.Event.on("textentry", "keypress", function(e) {
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ctr++;
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if(!(ctr%5)) { //on every fifth keystroke, autosave the contents
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storageEngine.setItem("simple-storage-textentry", YAHOO.util.Dom.get("textentry").value);
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document.getElementById("autosave").innerHTML = "last saved at " + (new Date).toString();
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YAHOO.log("Autosaved textarea content to " +
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storageEngine.getName() + " via Storage Utility.", "info", "example");
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}
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});
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});
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}
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});
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</textarea>
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<h2>Configuration for This Example</h2>
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<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers. <a href="http://developer.yahoo.com/yui/articles/hosting/?event&swfstore&storage&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
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</div>
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<div class="yui-u">
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<div id="loggerModule" class="yui-skin-sam">
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<h3 class="firstContent">YUI Logger Output:</h3>
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<div id="loggerDiv"></div>
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</div>
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<div id="examples">
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<h3>Storage Utility Examples:</h3>
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<div id="exampleToc">
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<ul>
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<li class='selected'><a href='../storage/storage-simple.html'>Simple Storage Example — Saving In-Progress Text Entry</a></li><li><a href='../storage/storage-advanced.html'>Advanced Storage Example</a></li> </ul>
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</div>
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</div>
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<div id="module">
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<h3>More Storage Utility Resources:</h3>
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<ul>
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<li><a href="http://developer.yahoo.com/yui/storage/">User's Guide</a> (external)</li>
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<li><a href="../../docs/module_storage.html">API Documentation</a></li>
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<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/storage.pdf">Cheat Sheet PDF</a> (external)</li></ul>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div class="yui-b" id="tocWrapper">
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<!-- TABLE OF CONTENTS -->
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<div id="toc">
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<ul>
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<li class="sect first">Yahoo! UI Library</li><li class="item"><a title="The Yahoo! User Interface Library (YUI)" href="http://developer.yahoo.com/yui/">Home (external)</a></li><li class="item"><a title="The Yahoo! User Interface Blog" href="http://yuiblog.com">YUIBlog (external)</a></li><li class="item"><a title="YUILibrary.com hosts the YUI community forums" href="http://yuilibrary.com/forum/">YUI Discussion Forum (external)</a></li><li class="item"><a title="The YUI Library source can be checked out from GitHub" href="http://github.com/yui/">YUI on GitHub</a></li><li class="item"><a title="Instantly searchable API documentation for the entire YUI library." href="../../docs/index.html">API Documentation</a></li><li class="item"><a title="Examples of every YUI utility and control in action" href="../../examples/">Functional Examples</a></li><li class="item"><a title="Videos and podcasts from the YUI Team and from the Yahoo! frontend engineering community." href="http://developer.yahoo.com/yui/theater/">YUI Theater (external)</a></li><li class="item"><a title="YUI is free and open, offered under a BSD license." href="http://developer.yahoo.com/yui/license.html">YUI License (external)</a></li><li class="sect">YUI Functional Examples</li><li class="item"><a title="The YUI Animation Utility - Functional Examples" href="../../examples/animation/index.html">Animation</a></li><li class="item"><a title="The YUI AutoComplete Control - Functional Examples" href="../../examples/autocomplete/index.html">AutoComplete</a></li><li class="item"><a title="The YUI Browser History Manager - Functional Examples" href="../../examples/history/index.html">Browser History Manager</a></li><li class="item"><a title="The YUI Button Control - Functional Examples" href="../../examples/button/index.html">Button</a></li><li class="item"><a title="The YUI Calendar Control - Functional Examples" href="../../examples/calendar/index.html">Calendar</a></li><li class="item"><a title="The YUI Carousel Control - Functional Examples" href="../../examples/carousel/index.html">Carousel</a></li><li class="item"><a title="The YUI Charts Control - Functional Examples" href="../../examples/charts/index.html">Charts</a></li><li class="item"><a title="The YUI Color Picker Control - Functional Examples" href="../../examples/colorpicker/index.html">Color Picker</a></li><li class="item"><a title="The YUI Cookie Utility - Functional Examples" href="../../examples/cookie/index.html">Cookie</a></li><li class="item"><a title="The YUI Connection Manager (AJAX) - Functional Examples" href="../../examples/connection/index.html">Connection Manager</a></li><li class="item"><a title="The YUI Container Family (Module, Overlay, Tooltip, Panel, Dialog, SimpleDialog) - Functional Examples" href="../../examples/container/index.html">Container</a></li><li class="item"><a title="The YUI DataTable Control - Functional Examples" href="../../examples/datatable/index.html">DataTable</a></li><li class="item"><a title="The YUI Dom Collection - Functional Examples" href="../../examples/dom/index.html">Dom</a></li><li class="item"><a title="The YUI Drag & Drop Utility - Functional Examples" href="../../examples/dragdrop/index.html">Drag & Drop</a></li><li class="item"><a title="The YUI Event Utility - Functional Examples" href="../../examples/event/index.html">Event</a></li><li class="item"><a title="The YUI Get Utility - Functional Examples" href="../../examples/get/index.html">Get</a></li><li class="item"><a title="The YUI ImageCropper Control - Functional Examples" href="../../examples/imagecropper/index.html">ImageCropper</a></li><li class="item"><a title="The YUI ImageLoader Utility - Functional Examples" href="../../examples/imageloader/index.html">ImageLoader</a></li><li class="item"><a title="The YUI JSON Utility - Functional Examples" href="../../examples/json/index.html">JSON</a></li><li class="item"><a title="The YUI Layout Manager - Functional Examples" href="../../examples/layout/index.html">Layout Manager</a></li><li class="item"><a title="The YUI Logger Control - Functional Examples" href="../../examples/logger/index.html">Logger</a></li><li class="item"><a title="The YUI Menu Control - Functional Examples" href="../../examples/menu/index.html">Menu</a></li><li class="item"><a title="The YUI Paginator - Functional Examples" href="../../examples/paginator/index.html">Paginator</a></li><li class="item"><a title="The YUI Profiler Utility - Functional Examples" href="../../examples/profiler/index.html">Profiler</a></li><li class="item"><a title="The YUI ProfileViewer Control - Functional Examples" href="../../examples/profilerviewer/index.html">ProfilerViewer</a></li><li class="item"><a title="The YUI ProgressBar Control - Functional Examples" href="../../examples/progressbar/index.html">ProgressBar</a></li><li class="item"><a title="The YUI Resize Utility - Functional Examples" href="../../examples/resize/index.html">Resize</a></li><li class="item"><a title="The YUI Rich Text Editor - Functional Examples" href="../../examples/editor/index.html">Rich Text Editor</a></li><li class="item"><a title="The YUI Selector Utility - Functional Examples" href="../../examples/selector/index.html">Selector</a></li><li class="item"><a title="The YUI Slider Control - Functional Examples" href="../../examples/slider/index.html">Slider</a></li><li class="selected "><a title="The YUI Storage Utility - Functional Examples" href="../../examples/storage/index.html">Storage</a></li><li class="item"><a title="The YUI SWF Utility - Functional Examples" href="../../examples/swf/index.html">SWF</a></li><li class="item"><a title="The YUI SWFStore Utility - Functional Examples" href="../../examples/swfstore/index.html">SWFStore</a></li><li class="item"><a title="The YUI Stylesheet Utility - Functional Examples" href="../../examples/stylesheet/index.html">Stylesheet</a></li><li class="item"><a title="The YUI TabView Control - Functional Examples" href="../../examples/tabview/index.html">TabView</a></li><li class="item"><a title="The YUI TreeView Control - Functional Examples" href="../../examples/treeview/index.html">TreeView</a></li><li class="item"><a title="The YUI Uploader Utility - Functional Examples" href="../../examples/uploader/index.html">Uploader (experimental)</a></li><li class="item"><a title="The YUI YAHOO Global Object - Functional Examples" href="../../examples/yahoo/index.html">YAHOO Global Object</a></li><li class="item"><a title="The YUI Loader Utility - Functional Examples" href="../../examples/yuiloader/index.html">YUI Loader</a></li><li class="item"><a title="The YUI Test Utility - Functional Examples" href="../../examples/yuitest/index.html">YUI Test</a></li><li class="item"><a title="YUI Reset CSS - Functional Examples" href="../../examples/reset/index.html">Reset CSS</a></li><li class="item"><a title="YUI Base CSS - Functional Examples" href="../../examples/base/index.html">Base CSS</a></li><li class="item"><a title="YUI Fonts CSS - Functional Examples" href="../../examples/fonts/index.html">Fonts CSS</a></li><li class="item"><a title="YUI Grids CSS - Functional Examples" href="../../examples/grids/index.html">Grids CSS</a></li><li class="sect">YUI Articles on the YUI Website</li><li class="item"><a title="Answers to Frequently Asked Questions about the YUI Library" href="http://developer.yahoo.com/yui/articles/faq/">YUI FAQ (external)</a></li><li class="item"><a title="Yahoo!'s philosophy of Graded Browser Support" href="http://developer.yahoo.com/yui/articles/gbs/">Graded Browser Support (external)</a></li><li class="item"><a title="Reporting Bugs and Making Feature Requests for YUI Components" href="http://developer.yahoo.com/yui/articles/reportingbugs/">Bug Reports/Feature Requests (external)</a></li><li class="item"><a title="Serve YUI source files from Yahoo! -- free, fast, and simple" href="http://developer.yahoo.com/yui/articles/hosting/">Serving YUI Files from Yahoo! (external)</a></li><li class="item"><a title="Best practices for working with web services while protecting user privacy" href="http://developer.yahoo.com/security/">Security Best Practices (external)</a></li></ul>
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</div>
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</div>
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</div><!--closes bd-->
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<div id="ft">
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<p class="first">Copyright © 2010 Yahoo! Inc. All rights reserved.</p>
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<p><a href="http://privacy.yahoo.com/privacy/us/devel/index.html">Privacy Policy</a> -
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<a href="http://docs.yahoo.com/info/terms/">Terms of Service</a> -
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<a href="http://docs.yahoo.com/info/copyright/copyright.html">Copyright Policy</a> -
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<a href="http://careers.yahoo.com/">Job Openings</a></p>
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dp.SyntaxHighlighter.HighlightAll('code');
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