ejemplo de código de progreso de jquery ajax

Ejemplo 1: ajax con barra de progreso

$.ajax({
    xhr: function() {
        var xhr = new window.XMLHttpRequest();

        // Upload progress
        xhr.upload.addEventListener("progress", function(evt){
            if (evt.lengthComputable) {
                var percentComplete = evt.loaded / evt.total;
                //Do something with upload progress
                console.log(percentComplete);
            }
       }, false);

       // Download progress
       xhr.addEventListener("progress", function(evt){
           if (evt.lengthComputable) {
               var percentComplete = evt.loaded / evt.total;
               // Do something with download progress
               console.log(percentComplete);
           }
       }, false);

       return xhr;
    },
    type: 'POST',
    url: "https://foroayuda.es/",
    data: {},
    success: function(data){
        // Do something success-ish
    }
});

Ejemplo 2: solicitud de progreso ajax

$.ajax({
    url: path,
    type: 'post',
    data: {payload: payload},
    xhr: function () {
        var xhr = $.ajaxSettings.xhr();
        xhr.onprogress = function e() {
            // For downloads
            if (e.lengthComputable) {
                console.log(e.loaded / e.total);
            }
        };
        xhr.upload.onprogress = function (e) {
            // For uploads
            if (e.lengthComputable) {
                console.log(e.loaded / e.total);
            }
        };
        return xhr;
    }
}).done(function (e) {
    // Do something
}).fail(function (e) {
    // Do something
});

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