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copied!<p>First add the <code>js</code> dependency to your <em>pubspec.yaml</em> :</p> <pre class="lang-yaml prettyprint-override"><code>dependencies: js: any </code></pre> <p>By using <em>js-interop</em> you can write almost the same code as in <em>javascript</em>.</p> <pre><code>import 'dart:html'; import 'package:js/js.dart' as js; void main() { js.scoped(() { js.context.$(new js.Callback.once(($) { $('p').hide('slow', new js.Callback.once(() { js.context.alert("The paragraph is now hidden"); })); })); }); } </code></pre> <p>The main differences are :</p> <ul> <li>You have to use <code>js.Callback.once</code> or <code>js.Callback.many</code> to set your callback functions. Use <code>js.Callback.once</code> if your callback is call only one time.</li> <li>Your code must be wrapped with the <code>js.scoped</code>. Basically, <a href="http://www.dartlang.org/articles/js-dart-interop/#managing-proxy-lifetimes" rel="noreferrer">managing proxy lifetimes</a> is here to prevent memory leak.</li> </ul> <p>That said, you can simplify the above code :</p> <pre><code>import 'dart:html'; import 'package:js/js.dart' as js; void main() { js.scoped(() { js.context.$('p').hide('slow', new js.Callback.once(() { window.alert("The paragraph is now hidden"); })); }); } </code></pre> <p>The changes are :</p> <ul> <li><code>js.context.$(new js.Callback.once(($) {</code> isn't needed because <code>main</code> is equivalent to the jQuery <code>$(function)</code>.</li> <li><code>js.context.alert</code> has been replace by <code>window.alert</code> : it's more efficient to directly use <em>DART</em> functions instead of communicate with <em>JS</em>.</li> </ul>

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