javascript - Why Does The Browser Hang When Updating The Progress Bar? -


problem: have code runs , needs periodically update progress bar. seems work fine until part of code update occurs inside loop.

after hangup, progress bar update whatever supposed after loop. instance in code:

<!doctype html> <html> <head> <title>test</title> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> <script> $(document).ready(function(){     $('#button1').click(function(){         $("#progressbar").val(0); //reset 0         for(var = 0; < 100000; i++){             $("#progressbar").val(i/1000);             //if(i === 50000){             //  alert("half way there");             //}         }     }); }); </script> </head> <body>     <button id="button1">simulate progress</button>     <progress id="progressbar" value="0" max="100"></progress> </body> </html>

my browser (firefox) hang-up once button pressed , after couple of seconds display 100% complete progress bar. if uncomment code, see progress bar 50% complete when alert shows up.

why hang , not produce smooth progress update? tried playing around web workers, saw pretty same response.

javascript runs in single thread. keeping busy looping doesn't have time go off , repaint page.

use iterator settimeout or setinterval instead.


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