ajax Getting started with ajax Installation or Setup
Example
What is AJAX?
AJAX stands for Asynchronous JavaScript and XML. In a nutshell, it is the use of the XMLHttpRequest object to communicate with server-side scripts. It can send as well as receive information in a variety of formats, including JSON, XML, HTML, and even text files. -Mozilla Developer Network 2016
The easiest way of implementing AJAX, especially if you're planning on communicating with servers is by using jQuery.
What is jQuery?
jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. -jquery.com
For those who haven't used much jQuery, think of it as functions that we can use to make our lives easier. This is perfect for using with AJAX as it cuts down on the amount of code we have to write to accomplish the same thing!
How to Add jQuery to your web site
If you need to Use Ajax, you need to add jQuery to your project. http://jquery.com/download/ In This link you can see many ways to add jquery. You can use downloaded version of jQuery or you can use a CDN. http://jquery.com/download/#jquery-39-s-cdn-provided-by-maxcdn. But there is some security risk if you uses CDN. Becauese the project call out to use jquery, so a hacker could manipulate the call. So better if you could use downloaded version. Lets see how to add jquery to html project. It's easy. First example is to use Downloaded source. Use this link to http://jquery.com/download/#jquery download. If you are just want to use jquery, I suggest you to download Download the compressed, production jQuery 3.1.1 When you download it add jquery-version.min.js to appropriate place (like javascript folder of your project) Then just add tag with src=jquery/location like below.
<head>
<script src="path/from/html/page/to/jquery.min.js"></script>
</head>
Lets see how to use an CDN. This link http://jquery.com/download/#using-jquery-with-a-cdn you can see various CDN (Content Delivery Network).
<head>
<script src="https://code.jquery.com/jquery-3.1.1.min.js" integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8=" crossorigin="anonymous"></script>
</head>
As you can see in you just have to add the tags which the CDN provider supply to the . Now add some scripts to the html page to check it's working.
<script>
$(document).ready(function(){
alert("jQuery Works")
});
</script>
If you see the jQuery works alert, That mean you added it correctly.
