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<!DOCTYPE html>  <html lang="en"> <head> <meta charset="utf-8"> <title>CanJS - init</title> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"> <link rel="stylesheet" type="text/css" href="./static/bundles/bit-docs-site/static.css"> <link rel="shortcut icon" sizes="16x16 24x24 32x32 48x48 64x64" href="/docs/images/canjs_favicon.ico"> <link rel="apple-touch-icon" sizes="57x57" href="../docs/images/canjs_favicon_57x57.png"> <link rel="apple-touch-icon-precomposed" sizes="57x57" href="../docs/images/canjs_favicon_57x57.png"> <link rel="apple-touch-icon" sizes="72x72" href="../docs/images/canjs_favicon_72x72.png"> <link rel="apple-touch-icon" sizes="114x114" href="../docs/images/canjs_favicon_114x114.png"> <link rel="apple-touch-icon" sizes="120x120" href="../docs/images/canjs_favicon_128x128.png"> <link rel="apple-touch-icon" sizes="144x144" href="../docs/images/canjs_favicon_144x144.png"> <link rel="apple-touch-icon" sizes="152x152" href="../docs/images/canjs_favicon_152x152.png"> <meta content="yes" name="apple-mobile-web-app-capable"> <meta name="apple-mobile-web-app-status-bar-style" content="white-translucent"> <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-2302003-11', 'auto'); ga('send', 'pageview'); </script> </head> <body> <input type="checkbox" id="nav-trigger" class="nav-trigger"/> <label for="nav-trigger">Menu</label> <div id="everything"> <div id="left" class="column"> <div class="top-left"> <div class="brand"> <div class="logo"> <a href="../index.html" alt="CanJS"></a> <div class="dropdown project-dropdown"> <a href="https://donejs.com/">DoneJS</a> <a href="http://stealjs.com/">StealJS</a> <a href="http://jquerypp.com/">jQuery ++</a> <a href="https://funcunit.com/">FuncUnit</a> <a href="http://documentjs.com/">DocumentJS</a> </div> </div> <div class="version"> <div class="version-number"> 3.0.0 </div> <div class="dropdown version-dropdown"> <a href="https://v2.canjs.com">2.3.27</a> </div> </div> </div> <div class="search-bar"> <p>   </p> </div> </div> <div class="bottom-left"> <div class="social-side-container"> <ul class="social-side"> <li> <a class="header-mobile github" href="https://github.com/canjs/canjs" target="_blank"><img class="social-icon-small" src="../docs/images/github.png">Github</a> </li> <li> <a class="header-mobile twitter" href="https://twitter.com/canjs" target="_blank"><img class="social-icon-small" src="../docs/images/twitter.png">Twitter</a> </li> </ul> <ul class="social-side"> <li> <a class="header-mobile" href="https://gitter.im/canjs/canjs" target="_blank">Chat</a> </li> <li> <a class="header-mobile" href="http://forums.donejs.com/c/canjs" target="_blank">Forum</a> </li> </ul> </div> <ul> <li class=" "> <a class="page" href="guides.html" title="Welcome to CanJS! 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The <code>init</code> method is where the bulk of your initialization code should go. A common thing to do in <code>init</code> is save the arguments passed into the constructor.</p> <h2>Examples</h2> <p>First, we'll make a Person constructor that has a first and last name:</p> <pre><code class="language-js">var Person = Construct.extend({ init: function(first, last) { this.first = first; this.last = last; } }); var justin = new Person("Justin", "Meyer"); justin.first; // "Justin" justin.last; // "Meyer" </code></pre> <p>Then, we'll extend Person into Programmer, and add a favorite language:</p> <pre><code class="language-js">var Programmer = Person.extend({ init: function(first, last, language) { // call base's init Person.prototype.init.apply(this, arguments); // other initialization code this.language = language; }, bio: function() { return "Hi! I'm " + this.first + " " + this.last + " and I write " + this.language + "."; } }); var brian = new Programmer("Brian", "Moschel", 'ECMAScript'); brian.bio(); // "Hi! I'm Brian Moschel and I write ECMAScript."; </code></pre> <h2>Modified Arguments</h2> <p><a href="can-construct.prototype.setup.html" title="">setup</a> is able to modify the arguments passed to <code>init</code>. If you aren't receiving the arguments you passed to <code>new Construct(args)</code>, check that they aren't being changed by <code>setup</code> along the inheritance chain.</p> </section> <script type="text/javascript"> var docObject = {"type":"function","name":"can-construct.prototype.init","parent":"can-construct.prototype","src":{"line":714,"codeLine":773,"path":"node_modules/can-construct/can-construct.js"},"description":"Called when a new instance of a Construct is created. \n","title":"init","signatures":[{"code":"construct.init(...args)","description":"","params":[{"types":[{"type":"*"}],"name":"args","description":"the arguments passed to the constructor (or the items of the array returned from [can-construct::setup])\n"}]}],"_curParam":{"types":[{"type":"*"}],"name":"args","description":"the arguments passed to the constructor (or the items of the array returned from [can-construct::setup])\n"},"comment":" ","pathToRoot":".."}; </script> </article> <footer><p>CanJS is part of <a href="http://donejs.com" target="_blank">DoneJS</a>. 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