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JavaScript Ajax Introduction

JS Ajax Introduction

Ajax is used to make request to web servers and update the website without reloading.

What is AJAX?

Asynchronous JavaScript And XML or Ajax is not a programming language.

AJAX just uses a combination of:

A browser built-in XMLHttpRequest object (to request data from a web server)
JavaScript and HTML DOM (to display or use the data)

AJAX is a misleading name. AJAX applications might use XML to transport data, but it is equally common to transport data as plain text or JSON text.

AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.

How AJAX Works

AJAX Example

					 
        
          <!DOCTYPE html>
          <html>
            <body>
              <button type="button" id="ajaxButton">Change Content</button>

              <script>
                let httpRequest;
                let button = document.getElementById("ajaxButton");
                button.addEventListener("click", makeRequest);

                function makeRequest() {
                  httpRequest = new XMLHttpRequest();

                  if (!httpRequest) {
                    alert("Giving up :( Cannot create an XMLHTTP instance");
                    return false;
                  }
                  httpRequest.onreadystatechange = alertContents;
                  httpRequest.open("GET", "test.html");
                  httpRequest.send();
                }

                function alertContents() {
                  if (httpRequest.readyState === XMLHttpRequest.DONE) {
                    if (httpRequest.status === 200) {
                      alert(httpRequest.responseText);
                    } else {
                      alert("There was a problem with the request.");
                    }
                  }
                }
              </script>
            </body>
          </html>

Test Code Online

Modern Browsers (Fetch API)

Modern Browsers can use Fetch API instead of the XMLHttpRequest Object.

The Fetch API interface allows web browser to make HTTP requests to web servers.

If you use the XMLHttpRequest Object, Fetch can do the same in a simpler way.

View JS PDF Ebooks

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JavaScript Ajax Introduction

JS Ajax Introduction

What is AJAX?

How AJAX Works

AJAX Example

Modern Browsers (Fetch API)

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