137 lines
No EOL
6.5 KiB
HTML
137 lines
No EOL
6.5 KiB
HTML
<!doctype html>
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<html>
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<head>
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<title>Mithril</title>
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<link href="http://fonts.googleapis.com/css?family=Open+Sans:300italic" rel="stylesheet" />
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<link href="lib/prism/prism.css" rel="stylesheet" />
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<link href="style.css" rel="stylesheet" />
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</head>
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<body>
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<header>
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<nav class="container">
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<a href="index.html" class="logo"><span>○</span> Mithril</a>
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<a href="getting-started.html">Guide</a>
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<a href="mithril.html">API</a>
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<a href="community.html">Community</a>
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<a href="mithril.min.zip">Download</a>
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<a href="http://github.com/lhorie/mithril.js" target="_blank">Github</a>
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</nav>
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</header>
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<main>
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<section class="content">
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<div class="container">
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<div class="row">
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<div class="col(3,3,12)">
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<h2 id="api">API (v0.1.2)</h2>
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<h3 id="core">Core</h3>
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<ul>
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<li><a href="mithril.html">m</a></li>
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<li><a href="mithril.prop.html">m.prop</a></li>
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<li><a href="mithril.withAttr.html">m.withAttr</a></li>
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<li><a href="mithril.module.html">m.module</a></li>
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<li><a href="mithril.trust.html">m.trust</a></li>
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<li><a href="mithril.render.html">m.render</a></li>
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<li><a href="mithril.redraw.html">m.redraw</a></li>
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</ul>
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<h3 id="routing">Routing</h3>
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<ul>
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<li><a href="mithril.route.html">m.route</a>
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<ul>
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<li><a href="mithril.route.html#defining-routes">m.route(rootElement, defaultRoute, routes)</a></li>
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<li><a href="mithril.route.html#redirecting">m.route(path)</a></li>
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<li><a href="mithril.route.html#mode-abstraction">m.route(element)</a></li>
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<li><a href="mithril.route.html#mode">m.route.mode</a></li>
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<li><a href="mithril.route.html#param">m.route.param</a></li>
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</ul>
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</li>
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</ul>
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<h3 id="data">Data</h3>
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<ul>
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<li><a href="mithril.request.html">m.request</a></li>
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<li><a href="mithril.deferred.html">m.deferred</a></li>
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<li><a href="mithril.sync.html">m.sync</a></li>
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<li><a href="mithril.computation.html">m.startComputation / m.endComputation</a></li>
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</ul>
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<h2 id="archive">History</h2>
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<ul>
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<li><a href="roadmap.html">Roadmap</a></li>
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<li><a href="change-log.html">Change log</a></li>
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</ul>
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</div>
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<div class="col(9,9,12)">
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<h2 id="m-deferred">m.deferred</h2>
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<p>This is a low-level method in Mithril. It's a modified version of the Thenable API.</p>
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<p>A deferred is an asynchrony monad. It exposes a <code>promise</code> property which can <em>bind</em> callbacks to build a computation tree.</p>
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<p>The deferred object can then <em>apply</em> a value by calling either <code>resolve</code> or <code>reject</code>, which then dispatches the value to be processed to the computation tree.</p>
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<p>Each computation function takes a value as a parameter and is expected to return another value, which in turns is forwarded along to the next computation function (or functions) in the tree.</p>
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<hr>
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<h3 id="usage">Usage</h3>
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<pre><code class="lang-javascript">//standalone usage
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var greetAsync = function() {
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var deferred = m.deferred();
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setTimeout(function() {
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deferred.resolve("hello");
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}, 1000);
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return deferred.promise;
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};
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greetAsync()
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.then(function(value) {return value + " world"})
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.then(function(value) {console.log(value)}); //logs "hello world" after 1 second</code></pre>
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<hr>
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<h3 id="signature">Signature</h3>
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<p><a href="how-to-read-signatures.html">How to read signatures</a></p>
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<pre><code class="lang-clike">Deferred deferred()
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where:
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Deferred :: Object { Promise promise, void resolve(any value), void reject(any value) }
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Promise :: GetterSetter { Promise then(any successCallback(any value), any errorCallback(any value)) }
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GetterSetter :: any getterSetter([any value])</code></pre>
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<ul>
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<li><p><strong>GetterSetter { Promise then([any successCallback(any value) [, any errorCallback(any value)]]) } promise</strong></p>
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<p>A promise has a method called <code>then</code> which takes two computation callbacks as parameters.</p>
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<p>The <code>then</code> method returns another promise whose computations (if any) receive their inputs from the parent promise's computation.</p>
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<p>A promise is also a getter-setter (see <a href="mithril.prop"><code>m.prop</code></a>). After a call to either <code>resolve</code> or <code>reject</code>, it holds the result of the parent's computation (or the <code>resolve</code>/<code>reject</code> value, if the promise has no parent promises)</p>
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<ul>
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<li><p><strong>Promise then([any successCallback(any value) [, any errorCallback(any value)]])</strong></p>
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<p>This method accepts two callbacks which process a value passed to the <code>resolve</code> and <code>reject</code> methods, respectively, and pass the processed value to the returned promise</p>
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<ul>
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<li><p><strong>any successCallback(any value)</strong> (optional)</p>
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<p>The <code>successCallback</code> is called if <code>resolve</code> is called in the root <code>deferred</code>.</p>
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<p>The default value (if this parameter is falsy) is the identity function <code>function(value) {return value}</code></p>
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<p>If this function returns undefined, then it passes the <code>value</code> argument to the next step in the thennable queue, if any</p>
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</li>
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<li><p><strong>any errorCallback(any value)</strong> (optional)</p>
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<p>The <code>errorCallback</code> is called if <code>reject</code> is called in the root <code>deferred</code>.</p>
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<p>The default value (if this parameter is falsy) is the identity function <code>function(value) {return value}</code></p>
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<p>If this function returns undefined, then it passes the <code>value</code> argument to the next step in the thennable queue, if any</p>
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</li>
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<li><p><strong>returns Promise promise</strong></p>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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<li><p><strong>void resolve(any value)</strong></p>
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<p>This method passes a value to the <code>successCallback</code> of the deferred object's child promise</p>
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</li>
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<li><p><strong>void reject(any value)</strong></p>
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<p>This method passes a value to the <code>errorCallback</code> of the deferred object's child promise</p>
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</li>
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</ul>
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</div>
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</div>
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</div>
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</section>
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</main>
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<footer>
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<div class="container">
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Released under the <a href="http://opensource.org/licenses/MIT" target="_blank">MIT license</a>
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<br />© 2014 Leo Horie
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</div>
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</footer>
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