# JavaScript - Testing Prototype

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Testing JavaScript Framework Libraries - Prototype

## Including Prototype

To test a JavaScript library, you need to include it in your web page.

To include a library, use the <script> tag with the src attribute set to the URL of the library:

## Including Prototype

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/prototype/1.7.2.0/prototype.js"></script>
</head>
<body>
.
.
.

## Prototype Described

Prototype provides functions to make HTML DOM programming easier.

Like jQuery, Prototype has its $() function.

The $() function accepts HTML DOM element id values (or DOM elements), and adds new functionality to DOM objects.

Unlike jQuery, Prototype has no ready() method to take the place of window.onload(). Instead, Prototype adds extensions to the browser and the HTML DOM.

In JavaScript, you can assign a function to handle the window's load event:

## The JavaScript Way:

function myFunction() {
var obj = document.getElementById("h01");
obj.innerHTML = "Hello Prototype";
}
onload = myFunction;

The Prototype equivalent is different:

## The Prototype Way:

function myFunction() {
$("h01").insert("Hello Prototype!");
}
Event.observe(window, "load", myFunction);

Event.observe() accepts three arguments:

- The HTML DOM or BOM (Browser Object Model) object you want to handle
- The event you want to handle
- The function you want to call

## Testing Prototype

Try the following example:

## Example

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/prototype/1.7.2.0/prototype.js"></script>
<script>
function myFunction() {
$("h01").insert("Hello Prototype!");
}
Event.observe(window, "load", myFunction);
</script>
</head>
<body>
<h1 id="h01"></h1>
</body>
</html>
Try it Yourself »

Also try this one:

## Example

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/prototype/1.7.2.0/prototype.js"></script>
<script>
function myFunction() {
$("h01").writeAttribute("style", "color:red").insert("Hello Prototype!");
}
Event.observe(window, "load", myFunction);
</script>
</head>
<body>
<h1 id="h01"></h1>
</body>
</html>
Try it Yourself »

As you can see from the example above, like jQuery, Prototype allows chaining.

Chaining is a handy way to perform multiple tasks on one object.

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