AJAX Course, free Lessons

AJAX stands for Asynchronous JavaScript And XML.
Ajax is based on JavaScript language, besides it uses HTML, CSS and a language for the server-side (like PHP or ASP).
The AJAX lessons in this course are free and best suited for beginners, it offers the necessary elements to learn Ajax and work with it. But you need to know, at least at a beginner level, PHP and JavaScript.

• Useful questions and answers on Forum JavaScript -Ajax.

Ajax Lessons

XMLHttpRequest object
- XMLHttpRequest object, what is and what can you do with this JavaScript object. XMLHttpRequest properties and methods
AJAX with GET and PHP
- Using AJAX to send data to a PHP script, via GET method. Displays the response received from PHP server
AJAX with POST and PHP
- Using AJAX to send data to a PHP script, via POST method. Simple example with Ajax, POST and PHP
AJAX and Forms
- AJAX course - How to get data from form fields and send it to a PHP script with Ajax
Sending data with GET and POST in the same request
- Using Ajax to send data to a PHP script, with GET and POST togeter, in the same request
Uploading images to server with Ajax
- Upload images to server using Ajax technology, display them after uploading - AJAX course
AJAX and XML
- Using Ajax to get data from an XML document, DOM properties and methods to access the XML elements
AJAX and JSON
- How to transform XML in JSON, using data received in JSON format and transferring it with AJAX

Daily Test with Code Example

HTML

CSS

JavaScript

PHP-MySQL

What attribute makes a radio button or checkbox input selected?

checked="checked" selected="selected" disabled="disabled"

<input type="checkbox" name="a_name" value="value" checked="checked" />

What CSS value scales the background image to the largest size contained within the element?

repeat-x contain linear-gradient

#id {
  background:url("path_to_image.png");
  background-size:contain;
  background-repeat:no-repeat;
}

What operator is used to determine the rest of the division of two numbers?

% * /

var rest8_7 = 8 % 7;
alert(rest8_7);

Indicate the PHP function that rounds a number up to the next highest integer.

floor() ceil() abs()

$nr = ceil(3.5);
echo $nr;        // 4

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