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JavaScript AJAX Basics Programming AJAX Programming AJAX Solution

I've concluded the AJAX basic course but can't identify the similarity with the following pattern. Could you help?

The AJAX course was excellent for knowledge not only in AJAX, but also related technologies. The structure of the code in the course was:

    var xhr = new XMLHttpRequest(); 
    xhr.onreadystatechange = function () {
             if (xhr.readyState === 4) {
                 document.getElementById(ajax).innerHTML = xhr.responseText; 
         xhr.open(GET, sidebar.html);

            function sendAJAX() {
             document.getElementById(load).style.display = none;

But in the projects I'm working, I keep encountering AJAX in the form:

      type: "POST",
      contentType: "application/json",
      url: "/api/search",
      data: JSON.stringify(search),
      dataType: 'json',
      cache: false,
      success: function (data) {
         //some code

My point is not to understand what the code above does, but to know the difference between this structure and the one learned in the course. What is it and what should I look for to learn it?

Thank you


1 Answer

Timothy Sawyer
Timothy Sawyer
31,052 Points

The top code snippet is using vanilla/plain JavaScript and the lower one is using jQuery syntax.

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