mithril-vndb/archive/v0.1.26/mithril.withAttr.html
2014-12-02 13:14:20 -05:00

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<h2 id="api">API (v0.1.26)</h2>
<h3 id="core">Core</h3>
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<li><a href="mithril.html" title="A utility to create virtual elements">m</a></li>
<li><a href="mithril.module.html" title="Initializes a controller/view pair">m.module</a></li>
<li><a href="mithril.prop.html" title="A getter-setter utility">m.prop</a></li>
<li><a href="mithril.withAttr.html" title="A event handler factory utility">m.withAttr</a></li>
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<h2 id="m-withattr">m.withAttr</h2>
<p>This is an event handler factory. It returns a method that can be bound to a DOM element&#39;s event listener.</p>
<p>Typically, it&#39;s used in conjunction with <a href="mithril.prop.html"><code>m.prop</code></a> to implement data binding in the view-to-model direction.</p>
<p>This method is provided to decouple the browser&#39;s event model from the controller/logic model.</p>
<p>You should use this method and implement similar ones when extracting values from a browser&#39;s Event object, instead of hard-coding the extraction code into controllers (or model methods).</p>
<hr>
<h3 id="usage">Usage</h3>
<pre><code class="lang-javascript">//standalone usage
document.body.onclick = m.withAttr(&quot;title&quot;, function(value) {
//alerts the title of the body element when it&#39;s clicked
alert(value);
})
</code></pre>
<p>A contrived example of bi-directional data binding</p>
<pre><code class="lang-javascript">var user = {
model: function(name) {
this.name = m.prop(name);
},
controller: function() {
this.user = new user.model(&quot;John Doe&quot;);
},
view: function(controller) {
m.render(&quot;body&quot;, [
m(&quot;input&quot;, {onchange: m.withAttr(&quot;value&quot;, controller.user.name), value: controller.user.name()})
]);
}
};
</code></pre>
<hr>
<h3 id="signature">Signature</h3>
<p><a href="how-to-read-signatures.html">How to read signatures</a></p>
<pre><code class="lang-clike">EventHandler withAttr(String property, void callback(any value))
where:
EventHandler :: void handler(Event e)
</code></pre>
<ul>
<li><p><strong>String property</strong></p>
<p>Defines the property of the DOM element whose value will be passed to the callback.</p>
</li>
<li><p><strong>void callback(any value)</strong></p>
<p>This function will be called with the value of the defined property as an argument.</p>
<ul>
<li><p><strong>any value</strong></p>
<p>This is the value of the defined DOM element&#39;s property.</p>
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<li><p><strong>returns EventHandler handler</strong></p>
<p>This handler method can be assigned to properties like <code>onclick</code>, or passed as callbacks to <code>addEventListener</code>.</p>
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