javascript - how add function beforeSend in callback -

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i have quetion jquery, how add function beforesend & success code :

$("body").on("click", "#br-submit-assets", function(e) {      var form = $(this).parents("form");    var btn = $(this);      form.ajaxsubmit(function(ret) {        $("#loadding").html('<i class="fa fa-spinner fa-pulse"></i>');          $(".career-notif").parent("div").remove();      var html = generate_alert(ret.result.status, ret.result.msg);      btn.parent("div").before(html);        });      return false;    });

it's work me want display #loading before send data :

beforesend: function () {      $('#loading').append('<i class="fa fa-spinner fa-pulse"></i>'); },

try this

beforesend: function () {      $('#loading').show(); } success : function(data){       $('#loading').hide(); }

and in html add div this

<div id="loading" style="display:none"><img src="images/loader.gif" /></div>

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