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$(document).ajaxStart(function() {
    console.log('ajaxStart');
    $('#load-bar-ajax').show();
});

$(document).ajaxStop(function() {
    console.log('ajaxStop');
    $('#load-bar-ajax').hide();
});

 <div id="load-bar-ajax" class="load-bar" style="display: none;">
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
</div>

/* LOAD BAR */
.load-bar {
    position: relative;
    width: 100%;
    height: 3px;
    background-color: #fdba2c;
}
.bar {
    content: "";
    display: inline;
    position: absolute;
    width: 0;
    height: 100%;
    left: 50%;
    text-align: center;
}
.bar:nth-child(1) {
    background-color: #da4733;
    animation: loading 3s linear infinite;
}
.bar:nth-child(2) {
    background-color: #3b78e7;
    animation: loading 3s linear 1s infinite;
}
.bar:nth-child(3) {
    background-color: #fdba2c;
    animation: loading 3s linear 2s infinite;
}
@keyframes loading {
    from {left: 50%; width: 0;z-index:100;}
    33.3333% {left: 0; width: 100%;z-index: 10;}
    to {left: 0; width: 100%;}
}