javascript - 'spinner' does not appear right after call it -


i using js show 'spinner' waiting state when loading data. call showwaiting() show 'spinner' , hidewaiting() hide 'spinner' when data loading completed. 'spinner' not appear after calling showwaiting() expected, appears after data finished loading (loaddata1()). please me. thanks

below source code:

js source code:

this.showwaiting(); this.loaddata1(); this.hidewaiting(); this.function1();  showwaiting: function () {           $("#progressbar").css("display", "block");           $("#waiting_popup").show();           $("#progressbar").progressbar({               value: false           });       }

html of spinner:

<div id="waiting_popup" style="z-index: 999999; position: relative;">         <div class="ui-widget-overlay ui-front"></div>         <div id="progressbar" style="width: 300px; margin: 18% auto; display:none;">             <div style="float: left;margin-left: 35%; margin-top: 5px;font-weight: bold;text-shadow: 1px 1px 0 #fff;">loading...</div>         </div>      </div>

javascript strictly single threaded, there nothing happening in browser user interface long code running. have end function after showing spinner, , use timeout start loading after browser has had chance update interface:

this.showwaiting(); var th = this; window.settimeout(function(){   th.loaddata1();   th.hidewaiting();   th.function1(); }, 0);

you should check if can make loading asynchronous. if spinner animated gif, won't move either long code running.


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