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bb101p4.html
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<title>bb101p4</title>
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/**
* prism.js default theme for JavaScript, CSS and HTML
* Based on dabblet (http://dabblet.com)
* @author Lea Verou
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</head>
<body>
<h2 id="toc_0">ব্যাকবোন মডেলে মেথড যোগ করা</h2>
<p>এর আগের আর্টিকেলে আমরা দেখেছি কিভাবে কিছু ডিফল্ট ভ্যালু সহ ব্যাকবোন মডেল ইনিশিয়ালাইজ করা যায়। এবার চলুন আমাদের মডেলে কিছু মেথড যোগ করি। নিচের কোডে আমরা <code>getName()</code> নামে একটি মেথড যোগ করব যার কাজ হবে আমাদের <code>person</code> মডেলের <code>firstName</code> এবং <code>lastName</code> একসাথে রিটার্ন দেয়া </p>
<pre><code class="language-javascript">var person = Backbone.Model.extend({
defaults:{
firstName: "The",
lastName: "Anonymous",
age: 0
},
getName: function(){
return this.get("firstName") + " " + this.get("lastName");
}
});
var p1 = new person({
firstName:"Aron",
lastName:"Springfield"
});
console.log(p1.getName());
//this will output Aron Springfield
</code></pre>
<p>উপরের কোডে খেয়াল করলে দেখবেন যে আমরা আমাদের <code>person</code> মডেলে <code>getName()</code> নামে একটি মেথড যোগ করেছি নিচের মত করে। আগেই বলেছি যে ব্যাকবোনের অবজেক্ট গুলো JSON ফরম্যাট এ লেখা হয়, তাই নতুন প্রপার্টি বা মেথড যোগ করতে গেলে কোডের এই স্ট্রাকচার টাই অনুসরণ করা বাঞ্ছনীয়। </p>
<pre><code class="language-javascript">getName: function(){
return this.get("firstName") + " " + this.get("lastName");
}
</code></pre>
<p>মেথডের ভেতর থেকে বর্তমান অবজেক্টের কোন প্রপার্টি অ্যাক্সেস করতে গেলে সেটা সবসময় <code>this</code> কি-ওয়ার্ড দিয়ে করতে হয়। জাভাস্ক্রিপ্টে কোন মেথড এর ভেতরে <code>this</code> কি-ওয়ার্ডটি সবসময় যেই অবজেক্টের মাঝে থেকে কল করা হচ্ছে সেই অবজেক্ট এর রেফারেন্স হিসেবে কাজ করে </p>
<p>আমরা চাইলে <code>this.get("firstName")</code> এর বদলে <code>this.attributes["firstName"]</code> এভাবেও প্রপার্টির ভ্যালু অ্যাক্সেস করতে পারতাম, কিন্তু সেটা না করাই ভাল। প্রপার্টির ভ্যালু অ্যাক্সেস করতে গেলে সবসময় get() কিংবা set() মেথড দুটো ব্যবহার করা উচিত </p>
<p>পূর্ববর্তী অংশ: <a href="bb101p3.html">ব্যাকবোন মডেল ব্যবহার শুরু করা</a> | পরবর্তী অংশ: <a href="bb101p6.html">মডেলের ডেটা ভ্যালিডেশন</a></p>
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