Wait 5 seconds before executing next line

Question

This function below doesn   t work like I want it to  being a JS novice I can   t figure out why   I need it to wait 5 seconds before checking whether the newState is -1   Currently  it doesn   t wait  it just checks straight away   function stateChange newState      setTimeout     5000      if newState    -1        alert  VIDEO HAS STOPPED

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Create new Js function  function sleep delay            var start   new Date   getTime            while  new Date   getTime    lt  start   delay             Call the function when you want to delay execution  Use milliseconds in int for delay value       Some code  sleep 1000       Next line

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Try this     the code will execute in 1 3 5 7 9 seconds later function exec         for var i 0 i lt 5 i              setTimeout function                 console log new Date         It s you code            i i 1  1000

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using angularjs    timeout function    if yourvariable   -1   doSomeThingAfter5Seconds        5000

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Use a delay function like this   var delay     function         var timer   0      return function callback  ms            clearTimeout  timer           timer   setTimeout callback  ms                  Usage    delay function           do stuff    5000       end delay   Credits  How to delay the  keyup   handler until the user stops typing

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setTimeout function              message   hide       2000    This will hide the   message  div after 2 seconds

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This solution comes from React Native s documentation for a refresh control   function wait timeout        return new Promise resolve   gt            setTimeout resolve  timeout               To apply this to the OP s question  you could use this function in coordination with await   await wait 5000   if  newState    -1        alert  Done

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You can add delay by making small changes to your function   async and await    const addNSecondsDelay    n    gt      return new Promise resolve   gt        setTimeout      gt          resolve           n   1000            const asyncFunctionCall   async         console log  quot stpe-1 quot       await addNSecondsDelay 5     console log  quot step-2 after 5 seconds delay quot         asyncFunctionCall

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You really shouldn t be doing this  the correct use of timeout is the right tool for the OP s problem and any other occasion where you just want to run something after a period of time  Joseph Silber has demonstrated that well in his answer  However  if in some non-production case you really want to hang the main thread for a period of time  this will do it   function wait ms      var start   new Date   getTime       var end   start     while end  lt  start   ms         end   new Date   getTime            With execution in the form   console log  before    wait 7000      7 seconds in milliseconds console log  after      I ve arrived here because I was building a simple test case for sequencing a mix of asynchronous operations around long-running blocking operations  i e  expensive DOM manipulation  and this is my simulated blocking operation  It suits that job fine  so I thought I post it for anyone else who arrives here with a similar use case  Even so  it s creating a Date   object in a while loop  which might very overwhelm the GC if it runs long enough  But I can t emphasize enough  this is only suitable for testing  for building any actual functionality you should refer to Joseph Silber s answer

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If you re in an async function you can simply do it in one line  console log 1   await new Promise resolve   gt  setTimeout resolve  3000       3 sec console log 2    FYI  if target is NodeJS you can use this if you want  it s a predefined promisified setTimeout function   await setTimeout Object getOwnPropertySymbols setTimeout  0   3000     3 sec

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I used it to run PC games from Edge or IE  And both self closes after 7 seconds  Firefox and Google Chrome cannot be used to start games this way       lt html gt       lt body gt       lt a href  quot E  game game exe quot  name  quot game quot  onmouseout  quot waitclose 7000   quot  gt  game      lt img src  quot game jpg quot  width  quot 100  quot  height  quot 97  quot   gt  lt  a gt       lt script gt      function waitclose ms        var start   new Date   getTime   var end start       while end  lt  start   ms   end   new Date   getTime         window open       self        window close               lt  script gt       lt  body gt       lt  html gt

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You should not just try to pause 5 seconds in javascript   It doesn t work that way   You can schedule a function of code to run 5 seconds from now  but you have to put the code that you want to run later into a function and the rest of your code after that function will continue to run immediately   For example   function stateChange newState        setTimeout function            if newState    -1  alert  VIDEO HAS STOPPED            5000       But  if you have code like this   stateChange -1   console log  Hello      The console log   statement will run immediately   It will not wait until after the timeout fires in the stateChange   function   You cannot just pause javascript execution for a predetermined amount of time   Instead  any code that you want to run delays must be inside the setTimeout   callback function  or called from that function    If you did try to  pause  by looping  then you d essentially  hang  the Javascript interpreter for a period of time   Because Javascript runs your code in only a single thread  when you re looping nothing else can run  no other event handlers can get called    So  looping waiting for some variable to change will never work because no other code can run to change that variable

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Here s a solution using the new async await syntax  Be sure to check browser support as this is a language feature introduced with ECMAScript 6  Utility function  const delay   ms   gt  new Promise res   gt  setTimeout res  ms     Usage  const yourFunction   async      gt      await delay 5000     console log  quot Waited 5s quot       await delay 5000     console log  quot Waited an additional 5s quot        The advantage of this approach is that it makes your code look and behave like synchronous code

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Based on Joseph Silber s answer  I would do it like that  a bit more generic   You would have your function  let s create one based on the question    function videoStopped newState      if  newState    -1           alert  VIDEO HAS STOPPED             And you could have a wait function   function wait milliseconds  foo  arg       setTimeout function              foo arg      will be executed after the specified time        milliseconds       At the end you would have   wait 5000  videoStopped  newState     That s a solution  I would rather not use arguments in the wait function  to have only foo    instead of foo arg    but that s for the example

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Best way to create a function like this for wait in milli seconds  this function will wait for milliseconds provided in the argument    x000D   x000D  function waitSeconds iMilliSeconds    x000D      var counter  0 x000D            start   new Date   getTime   x000D            end   0  x000D      while  counter  lt  iMilliSeconds    x000D          end   new Date   getTime    x000D          counter   end - start  x000D        x000D    x000D   x000D   x000D

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You have to put your code in the callback function you supply to setTimeout   function stateChange newState        setTimeout function              if  newState    -1                alert  VIDEO HAS STOPPED                     5000       Any other code will execute immediately

[javascript] Wait 5 seconds before executing next line

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