I have a javascript function that gets a JSON object from a URL and I want to refresh the JSON object every hour with up to date data.

I am assuming the way to do this is to recall the javascript function that gets the JSON object from a URL every hour.

However I do not know how to set a function to automatically rerun every hour, could someone explain how this is done?

Thank you

I have a javascript function that gets a JSON object from a URL and I want to refresh the JSON object every hour with up to date data.

I am assuming the way to do this is to recall the javascript function that gets the JSON object from a URL every hour.

However I do not know how to set a function to automatically rerun every hour, could someone explain how this is done?

Thank you

• javascript
• jquery
• ajax
• json

• 2 client side? you can use setInterval, this requires your page to be open and stay opened all the time though.. – BeNdErR Commented Oct 2, 2014 at 11:45
• 4 read up on setinterval - but who has a web page open for an hour? – Ed Heal Commented Oct 2, 2014 at 11:45
• 1 you could probably use a cron job look at this URL stackoverflow./questions/4695629/… – chaos505 Commented Oct 2, 2014 at 11:47
• Presuming the AJAX contacts a server side language (PHP or whatever), store the time of the last refresh in a database. Then, check that an hour has passed against the stored last update time before requesting the JSON object. – ggdx Commented Oct 2, 2014 at 11:48
• Could everyone writing an answer at least get the number of bloody milliseconds right? Sheesh. – Andy Commented Oct 2, 2014 at 11:49

4 Answers 4

function doSomething()
{
    alert('Test');
}


setInterval(doSomething, 60*60*1000);

You could re-call your function with setting an interval:

<script type="text/javascript"> 
   function getJSONObjectFromURL(){
      // do stuff
   }
   //set interval in milliseconds and call function again
   //1h = 60m = 3600s = 3600000ms
   var timeoutID = window.setInterval(getJSONObjectFromURL, 3600000);
</script>

You may try:

setInterval(function(){alert("Hello")},3600000);

Where 3600000 is the time interval in miliseconds.

Go with setInterval as shown below :-

Syntax

setInterval(function,milliseconds,lang)

Parameter Values

Parameter         Description

function         Required. The function that will be executed 
milliseconds     Required. The intervals (in milliseconds) on how often to execute the code 
lang             Optional. JScript | VBScript | JavaScript 

Return Value

An integer with the ID value of the timer that is set. Use this value with the clearInterval() method to cancel the timer.

Example

function test() 
{
     ////Your code
}
setInterval(function(){test()}, 60 * 60 *1000); //// 60 minutes = 3600 seconds = 3600000 miliseconds 

For more details :-

http://www.w3schools./jsref/met_win_setinterval.asp