javascript setInterval

by

Passing a string to setInterval is fine, and is one of two ways to use setInterval, the other is passing a function pointer. It is not wrong in any way like the other answers state, but it is not as efficient (as the code must be reparsed) nor is it necessary for your purpose. Both

setInterval('doSome();', 60000); // this runs doSome from the global scope
                                 // in the global scope

and

setInterval(doSome, 60000);      // this runs doSome from the local scope
                                 // in the global scope

are correct, though they have a slightly different meaning. If doSome is local to some non-global scope, calling the latter from within the same scope will run the local doSome at 60000ms intervals. Calling the former code will always look for doSome in the global scope, and will fail if there is no doSome function in the global scope.

The function will reliably be triggered, regardless of tab focus, at intervals of at least 60000ms, but usually slightly more due to overheads and delays.

All browsers clamp the interval value to at least a certain value to avoid intervals being too frequent (I think it’s a minimum of 10ms or 4ms or something, I can’t exactly remember).

Note that some browsers (the upcoming Firefox 5 is one, but there are probably others that I don’t know of) further clamp setInterval drastically to e.g. 1000ms if the tab is not focused. (Reference)

More Related Contents:

  1. phone number validation in js [closed]
  2. When is .then(success, fail) considered an antipattern for promises?
  3. What is the JavaScript >>> operator and how do you use it?
  4. Multi-row insert with pg-promise
  5. Dealing with float precision in Javascript [duplicate]
  6. Render basic HTML view?
  7. Memory leak risk in JavaScript closures
  8. Pretty printing XML with javascript
  9. Using querySelectorAll to retrieve direct children
  10. JavaScript double colon (bind operator)
  11. Get function name in JavaScript
  12. What do the different readystates in XMLHttpRequest mean, and how can I use them?
  13. How to auto-scroll to end of div when data is added? [duplicate]
  14. How can I get an object’s absolute position on the page in Javascript? [duplicate]
  15. Bootstrap datepicker disabling past dates without current date
  16. jQuery scrolltop firefox not working
  17. What reason is there to use null instead of undefined in JavaScript?
  18. Does Javascript slice method return a shallow copy?
  19. How to play wav audio byte array via javascript/html5?
  20. Most modern method of getting mouse position within a canvas in native JavaScript [duplicate]
  21. Is there a way to get Chai working with asynchronous Mocha tests?
  22. How to remove an event listener in javascript?
  23. A plain JavaScript way to decode HTML entities, works on both browsers and Node
  24. ScrollTo function in AngularJS
  25. getMinutes() 0-9 – How to display two digit numbers?
  26. Deobfuscating Javascript [closed]
  27. Is there a good use case for the constructor property in Javascript?
  28. Why does .then() chained to Promise.resolve() allow const declaration to be reassigned?
  29. Angular controller scope not updating after jQuery ajax call
  30. How can I compare two color values in jQuery/JavaScript?

Leave a Comment