Put a Delay in Javascript

Question

I need to add a delay of about 100 miliseconds to my Javascript code but I don t want to use the setTimeout function of the window object and I don t want to use a busy loop   Does anyone have any suggestions

User · Answer

Actually only setTimeout is fine for that job and normally you cannot set exact delays with non determined methods as busy loops

User · Answer

I just had an issue where I needed to solve this properly   Via Ajax  a script gets X  0-10  messages  What I wanted to do  Add one message to the DOM every 10 Seconds   the code I ended up with     each messages  function idx  el     window setTimeout function        doSomething el       Math floor idx 1  10000         Basically  think of the timeouts as a  timeline  of your script   This is what we WANT to code   DoSomething    WaitAndDoNothing 5000   DoSomethingOther    WaitAndDoNothing 5000   DoEvenMore      This is HOW WE NEED TO TELL IT TO THE JAVASCRIPT   At Runtime 0      DoSomething    At Runtime 5000   DoSomethingOther    At Runtime 10000  DoEvenMore      Hope this helps

User · Answer

Use a AJAX function which will call a php page synchronously and then in that page you can put the php usleep   function which will act as a delay    function delay t    var xmlhttp   if  window XMLHttpRequest       code for IE7   Firefox  Chrome  Opera  Safari  xmlhttp new XMLHttpRequest        else      code for IE6  IE5  xmlhttp new ActiveXObject  Microsoft XMLHTTP        xmlhttp open  POST   http   www hklabs org files delay php time   t false      This will call the page named delay php and the response will be sent to a division with ID as  response   xmlhttp send     document getElementById  response   innerHTML xmlhttp responseText       http   www hklabs org articles put-delay-in-javascript

User · Answer

If you re okay with ES2017  await is good   const DEF DELAY   1000   function sleep ms      return new Promise resolve   gt  setTimeout resolve  ms    DEF DELAY       await sleep 100     Note that the await part needs to be in an async function     IIAFE  immediately invoked async function expression   async    gt       Do some stuff   await sleep 100       Do some more stuff

User · Answer

Unfortunately  setTimeout   is the only reliable way  not the only way  but the only reliable way  to pause the execution of the script without blocking the UI   It s not that hard to use actually  instead of writing this   var x   1      Place mysterious code that blocks the thread for 100 ms   x   x   3   2  var y   x   2    you use setTimeout   to rewrite it this way   var x   1  var y   null     To keep under proper scope  setTimeout function         x   x   3   2      y   x   2     100     I understand that using setTimeout   involves more thought than a desirable sleep   function  but unfortunately the later doesn t exist  Many workarounds are there to try to implement such functions  Some using busy loops   function sleep milliseconds      var start   new Date   getTime      for  var i   0  i  lt  1e7  i          if   new Date   getTime   - start   gt  milliseconds         break                others using an XMLHttpRequest tied with a server script that sleeps for a amount of time before returning a result   Unfortunately  those are workarounds and are likely to cause other problems  such as freezing browsers   It is recommended to simply stick with the recommended way  which is setTimeout

User · Answer

This thread has a good discussion and a useful solution   function pause  iMilliseconds         var sDialogScript    window setTimeout  function      window close           iMilliseconds             window showModalDialog  javascript document writeln    lt script gt     sDialogScript     lt       script gt           Unfortunately it appears that this doesn t work in some versions of IE  but the thread has many other worthy proposals if that proves to be a problem for you

[javascript] Put a Delay in Javascript

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