Page 62 - JavaScript

removePreloader();
} else {
// the request isn't finished, add the preloader
addPreloader()
}

};

xmlhttp.open('GET', your_file.php, true);
xmlhttp.send();

Listening to AJAX events at a global level

// Store a reference to the native method
let open = XMLHttpRequest.prototype.open;

// Overwrite the native method
XMLHttpRequest.prototype.open = function() {
// Assign an event listener
this.addEventListener("load", event => console.log(XHR), false);
// Call the stored reference to the native method
open.apply(this, arguments);
};

Read AJAX online: https://riptutorial.com/javascript/topic/192/ajax

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