javascript setTimeout not working

Question

Hi I m trying to use the function setTimeout   in javascript except it s not working  Thanks in advance to anyone who can help    lt  DOCTPYE html gt   lt html gt   lt head gt       lt script gt          var button   document getElementById  reactionTester            var start    document getElementById  start             function init                 var startInterval  in milliseconds     Math floor Math random     30    1000              setTimeout startTimer    startInterval                      function startTimer                 document write  hey                   lt  script gt   lt  head gt   lt body gt   lt form id  form  gt       lt input type  button id   reactionTester  onclick  stopTimer    gt       lt input type  button  value  start  id  start  onclick  init    gt   lt  form gt   lt  body gt   lt  html gt

User · Answer

Use   setTimeout startTimer startInterval      You re calling startTimer   and feed it s result  which is undefined  as an argument to setTimeout

User · Answer

If your in a situation where you need to pass parameters to the function you want to execute after timeout  you can wrap the  named  function in an anonymous function   i e  works  setTimeout function    startTimer p1  p2      1000     i e  won t work because it will call the function right away  setTimeout  startTimer p1  p2   1000

User · Answer

Two things    Remove the parenthesis in setTimeout startTimer   startInterval    Keeping the parentheses invokes the function immediately  Your startTimer function will overwrite the page content with your use of document write  without the above fix   and wipes out the script and HTML in the process

User · Answer

Please change your code as follows     lt script gt      var button   document getElementById  reactionTester        var start   document getElementById  start        function init             var startInterval  in milliseconds     Math floor Math random   30  1000          setTimeout startTimer startInterval              function startTimer            document write  hey           lt  script gt    See if that helps   Basically  the difference is references the  startTimer  function instead of executing it

User · Answer

If you want to pass a parameter to the delayed function       setTimeout setTimer  3000  param1  param2

User · Answer

To make little more easy to understand use like below  which i prefer the most  Also it permits to call multiple function at once  Obviously   setTimeout function          startTimer          function2          function3       startInterval

User · Answer

This line   setTimeout startTimer    startInterval      You re invoking startTimer    Instead  you need to pass it in as a function to be invoked  like so   setTimeout startTimer  startInterval

[javascript] javascript setTimeout() not working

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