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How to associate functions with objects using JavaScript?
How to associate functions with objects using JavaScript?
✍: Guest
Let's now create a custom "toString()" method for our movie object. We can embed the function directly in the object like this.
<script type="text/javascript"> function movie(title, director) { this.title = title; this.director = director; this.toString = function movieToString() { return("title: "+this.title+" director: "+this.director); } } var narnia = new movie("Narni","Andrew Adamson"); document.write(narnia.toString()); </script>
This produces
title: Narni director: Andrew Adamson
Or we can use a previously defined function and assign it to a variable. Note that the name of the function is not followed by parenthisis, otherwise it would just execute the function and stuff the returned value into the variable.
<script type="text/javascript"> function movieToString() { return("title: "+this.title+" director: "+this.director); } function movie(title, director) { this.title = title; this.director = director; this.toString = movieToString; //assign function to this method pointer } var aliens = new movie("Aliens","Cameron"); document.write(aliens.toString()); </script>
This produces
title: Aliens director: Cameron
2011-08-09, 4017👍, 0💬
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