How to use setInterval and clearInterval

Question

function doKeyDown event        switch  event keyCode        case 32             Space bar was pressed            if  x    4                setInterval drawAll  20                     else               setInterval drawAll  20               x    dx                    break            Hi all   I want to call drawAll   once not creating a loop that call drawAll again and again  should I use recursive method for that or should I use clearInterval    Also please tell me to use clearInterval  Thanks

User · Answer

clearInterval is one option   var interval   setInterval doStuff  2000      2000 ms   start after 2sec  function doStuff       alert  this is a 2 second warning      clearInterval interval

User · Answer

Side note     if you want to use separate functions to set  amp  clear interval  the interval variable have to be accessible for all of them  in  relative global   or  one level up  scope   var interval   null       function startStuff func  time        interval   setInterval func  time      function stopStuff         clearInterval interval

User · Answer

setInterval sets up a recurring timer  It returns a handle that you can pass into clearInterval to stop it from firing   var handle   setInterval drawAll  20       When you want to cancel it  clearInterval handle   handle   0     I just do this so I know I ve cleared the interval   On browsers  the handle is guaranteed to be a number that isn t equal to 0  therefore  0 makes a handy flag value for  no timer set    Other platforms may return other values  NodeJS s timer functions return an object  for instance    To schedule a function to only fire once  use setTimeout instead  It won t keep firing   It also returns a handle you can use to cancel it via clearTimeout before it fires that one time if appropriate    setTimeout drawAll  20

User · Answer

Use setTimeout drawAll  20  instead  That only executes the function once

User · Answer

I used angular with electron    In my case  setInterval returns a Nodejs Timer object  which when I called clearInterval timerobject  it did not work   I had to get the id first and call to clearInterval  clearInterval timerobject  id   I have struggled many hours with this  hope this helps

[javascript] How to use setInterval and clearInterval?

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