JavaScript routine for calling a function every x seconds -


i have javascript want run every 5 seconds. display status of gpio pins on raspberry pi. right don't update if pin chages status script i'm running. tried put in var myvar = setinterval(function(){ change_pin() }, 1000); don't me..

the code looking this;

//thefreeelectron 2015, http://www.instructables.com/member/thefreeelectron/ //javascript, uses pictures buttons, sends , receives values to/from rpi //these buttons var button_0 = document.getelementbyid("button_0"); var button_1 = document.getelementbyid("button_1"); var button_2 = document.getelementbyid("button_2"); var button_3 = document.getelementbyid("button_3"); var button_4 = document.getelementbyid("button_4"); var button_5 = document.getelementbyid("button_5"); var button_6 = document.getelementbyid("button_6"); var button_7 = document.getelementbyid("button_7");  //create array easy access later var buttons = [ button_0, button_1, button_2, button_3, button_4, button_5, button_6, button_7];  //this function asking gpio.php, receiving datas , updating index.php pictures function change_pin ( pic ) { var data = 0; //send pic number gpio.php changes //this http request     var request = new xmlhttprequest();     request.open( "get" , "gpio.php?pic=" + pic, true);     request.send(null);     //receiving informations     request.onreadystatechange = function () {         if (request.readystate == 4 && request.status == 200) {             data = request.responsetext;             //update index pic             if ( !(data.localecompare("0")) ){                 buttons[pic].src = "data/img/red/red_"+pic+".jpg";             }             else if ( !(data.localecompare("1")) ) {                 buttons[pic].src = "data/img/green/green_"+pic+".jpg";             }             else if ( !(data.localecompare("fail"))) {                 alert ("something went wrong!" );                 return ("fail");                         }             else {                 alert ("something went wrong!" );                 return ("fail");              }         }         //test if fail         else if (request.readystate == 4 && request.status == 500) {             alert ("server error");             return ("fail");         }         //else          else if (request.readystate == 4 && request.status != 200 && request.status != 500 ) {              alert ("something went wrong!");             return ("fail"); }     }     return 0; }


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