javascript - How to call this function automatically -

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im using following function call ajax request, , fill corresponding divs response: 

$( function() {      $(document).ready(function() {          var postdata = "";          $.ajax( {             url : \'functions/ajax_api.php?\',             type : \'post\',             data : postdata,                             success : function( resp ) {                 $(\'#id1\').html($(\'#id1\' , resp).html());                 $(\'#id2\').html($(\'#id2\' , resp).html());             }         });            return false;     });  });

the function works fine. question how can call automatically every few seconds?

i tried using window.settimeout(function, 3000) couldnt set correctly.

use setinterval(); instead of .settimeout()

let me little bit that

var interval , setitinterval; // variables can change names interval = function(){     // ajax code here }

to run .. use:

setitinterval = setinterval(interval , 3000);

to stop .. use

clearinterval(setitinterval);

make sure read setinterval more information.

for complete answer , last thing want when using setinterval(); better use visibilitychange avoid server error , server load or that

document.addeventlistener('visibilitychange',function(){     if(document.visibilitystate == 'visible'){         // user view page     }else{         // user not see page     } });

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