javascript - How can I animate a progress bar's width changing? -


i'm using file reader load images html5 canvas; i'm trying build progress bar; works behaviour not smooth... mean bar starts size of 0 px , increase in jerky way; possible have smoother bar size increasing?

the code:

reader.readasdataurl(file);  function updateprogress(evt) {     jquery('.file-loading-bar').width(100 * (evt.loaded / evt.total) + '%'); }  reader.onloadstart = function() {     jquery('.file-loading-bar').width(0); }  reader.onprogress = updateprogress;

here small sample put show how smooth interpolation of value of html5 <progress> bar. doesn't tie in actual file api because didn't want have keep copying giant files browser cache try , test thing. however, main point whenever have onprogress trigger, want call addprogress() function. rid of settimeout()s though because there simulate progress.

jsfiddle

html/js

<!doctype html> <html>    <head>       <title>smooth progress bar</title>       <meta charset="utf-8">       <meta name="viewport" content="width=device-width">       <script src="js/libs/jquery/jquery.js"></script>    </head>    <body>       <!--our progress bar-->       <progress id="mybar" value="20" max="100"></progress>        <!--our button start progress simulation-->       <button id="start">start</button>        <!--our small script simulate progress-->       <script>          // progress bar element          var bar = document.getelementbyid("mybar");           // add listener simulate progress          $("#start").click(doprogress);           // our function causes progress added          function addprogress() {             /*              * create animation interpolate value              * current value of progress bar actual new value              * of progress bar.              */             $({                // value @ present                interpval: bar.value             }).animate({                // new value after progress has happened                interpval: bar.value + 10             },             {                // how long interpolation should take                duration: 200,                // function set progress bar's value inter val                step: function() {                   bar.value = this.interpval;                }             });              // check see if should end our simulation             if (bar.value < bar.max) {                // if aren't @ max, keep progressing                settimeout(addprogress, 2000);             }          }           // function bootstrap our progress          function doprogress() {             settimeout(addprogress, 500);          }       </script>    </body> </html>

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