Head Rush Ajax

40

Chapter 1

Behind the scenes, something has to connect all these pieces together. That

“something” is the web browser. The browser takes your HTML and CSS, and turns

those angle brackets and semicolons into a page with graphics, buttons, and text.

It’s also the web browser that runs your JavaScript code... behind the scenes, the

browser takes care of important jobs like storing the values of your variables, creating

new types, and handling any network requests that your code might make.

Introducing the web browser

JavaScript

<html>

.

.

.

</html>

HTML

h1, h2 {

fon

col

}

p {

CSS

Web Browser

Web Server

...and turns them into

a visual page that

users can see.

Internet Explorer

Firefox

Opera

Safari

Mozilla

It’s the browser that stores

variable values and gives

your code access to network

requests and responses.

When you type in a URL,

click a button, or enter a

value in a eld, the browser

passes those events on to

a JavaScript function or a

program on the web server.

The browser also handles making

requests to web servers, and guring

out what to do with responses it

gets back from those servers.

The web browser

takes your HTML

and CSS...

<script>

var request...

function foo()

{

...

}

</script>

<?php

require(‘lib.php’);

function go() {

$myVar = ...

return ...

}

?>

introducing the web browser

Here’s what we’ve

been talking

about these last

several pages.