Execute script after specific delay using JavaScript

Question

Is there any JavaScript method similar to the jQuery delay   or wait    to delay the execution of a script for a specific amount of time

User · Answer

As other said  setTimeout is your safest bet But sometimes you cannot separate the logic to a new function then you can use Date now   to get milliseconds and do the delay yourself       x000D   x000D  function delay milisecondDelay    x000D     milisecondDelay    Date now    x000D     while Date now    lt  milisecondDelay    x000D    x000D   x000D  alert  Ill be back in 5 sec after you click OK        x000D  delay 5000   x000D  alert    Im back   date    new Date     x000D   x000D   x000D

User · Answer

There is the following   setTimeout function  milliseconds     function which can be passed the time after which the function will be executed   See  Window setTimeout   Method

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delay function          delay or pause for some time     param  number  t - time  ms      return  Promise lt   gt       const delay   async t   gt  new Promise resolve   gt  setTimeout resolve  t      usage inside async function   await delay 1000

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I had some ajax commands I wanted to run with a delay in between   Here is a simple example of one way to do that   I am prepared to be ripped to shreds though for my unconventional approach           Show current seconds and milliseconds      I know there are other ways  I was aiming for minimal code     and fixed width   function secs         var s   Date now         s   s substr s length - 5     return s substr 0  2          s substr 2          Log we re loading console log  Loading      secs          Create a list of commands to execute var cmds          function     console log  A      secs            function     console log  B      secs            function     console log  C      secs            function     console log  D      secs            function     console log  E      secs          function     console log  done      secs               Run each command with a second delay in between var ms   1000  cmds forEach function cmd  i        setTimeout cmd  ms   i           Log we ve loaded  probably logged before first command  console log  Loaded      secs       You can copy the code block and paste it into a console window and see something like   Loading  03 077 Loaded  03 078 A  03 079 B  04 075 C  05 075 D  06 075 E  07 076 done  08 076

User · Answer

If you really want to have a blocking  synchronous  delay function  for whatsoever   why not do something like this    lt script type  text javascript  gt      function delay ms            var cur d   new Date            var cur ticks   cur d getTime            var ms passed   0          while ms passed  lt  ms                var d   new Date        Possible memory leak              var ticks   d getTime                ms passed   ticks - cur ticks                 d   null      Prevent memory leak                       alert  2 sec delay       delay 2000       alert  done     500 ms delay       delay 500       alert  done     lt  script gt

User · Answer

The simplest solution to call your function with delay is   function executeWithDelay anotherFunction        setTimeout anotherFunction  delayInMilliseconds

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why can t you put the code behind a promise   typed in off the top of my head    x000D   x000D  new Promise function resolve  reject    x000D    setTimeout resolve  2000   x000D     then function     x000D    console log  do whatever you wanted to hold off on    x000D      x000D   x000D   x000D

User · Answer

If you only need to test a delay you can use this   function delay ms       ms    new Date   getTime       while  new Date    lt  ms        And then if you want to delay for 2 second you do   delay 2000     Might not be the best for production though  More on that in the comments

User · Answer

Just to add to what everyone else have said about setTimeout  If you want to call a function with a parameter in the future  you need to set up some anonymous function calls    You need to pass the function as an argument for it to be called later  In effect this means without brackets behind the name  The following will call the alert at once  and it will display  Hello world    var a    world   setTimeout alert  Hello     a   2000     To fix this you can either put the name of a function  as Flubba has done  or you can use an anonymous function  If you need to pass a parameter  then you have to use an anonymous function   var a    world   setTimeout function   alert  Hello     a    2000   a    Stack Overflow     But if you run that code you will notice that after 2 seconds the popup will say  Hello Stack Overflow   This is because the value of the variable a has changed in those two seconds  To get it to say  Hello world  after two seconds  you need to use the following code snippet   function callback a       return function            alert  Hello     a           var a    world   setTimeout callback a   2000   a    Stack Overflow     It will wait 2 seconds and then popup  Hello world

User · Answer

I really liked Maurius  explanation  highest upvoted response  with the three different methods for calling setTimeout     In my code I want to automatically auto-navigate to the previous page upon completion of an AJAX save event   The completion of the save event has a slight animation in the CSS indicating the save was successful   In my code I found a difference between the first two examples    setTimeout window history back    3000     This one does not wait for the timeout--the back   is called almost immediately no matter what number I put in for the delay   However  changing this to   setTimeout function    window history back     3000     This does exactly what I was hoping   This is not specific to the back   operation  the same happens with alert     Basically with the alert   used in the first case  the delay time is ignored   When I dismiss the popup the animation for the CSS continues   Thus  I would recommend the second or third method he describes even if you are using built in functions and not using arguments

User · Answer

To add on the earlier comments  I would like to say the following     The setTimeout   function in JavaScript does not pause execution of the script per se  but merely tells the compiler to execute the code sometime in the future   There isn t a function that can actually pause execution built into JavaScript  However  you can write your own function that does something like an unconditional loop till the time is reached by using the Date   function and adding the time interval you need

User · Answer

Just to expand a little    You can execute code directly in the setTimeout call  but as  patrick says  you normally assign a callback function  like this  The time is milliseconds  setTimeout func  4000   function func         alert  Do stuff here

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The simple reply is    setTimeout      function              x   1         1000     The function above waits for 1 second  1000 ms  then sets x to 1   Obviously this is an example  you can do anything you want inside the anonymous function

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You can also use window setInterval   to run some code repeatedly at a regular interval

User · Answer

You need to use setTimeout and pass it a callback function  The reason you can t use sleep in javascript is because you d block the entire page from doing anything in the meantime  Not a good plan  Use Javascript s event model and stay happy  Don t fight it

[javascript] Execute script after specific delay using JavaScript

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