How to make periodic AJAX calls to cross-domain server

Question

I am trying to figure out how to make periodic AJAX calls to a cross-domain hostname. For example, how can I serve content from example.com and make an AJAX call to example.org every 30 seconds.

The canonical solution to this question is a JSONP call in a <script> tag. However, the <script> tag is just loaded once. Therefore, it can not generate periodic calls to another server - just a single call when the page loads.

Is there a way to make a periodic AJAX call to a cross-domain server?

You'll want to look into `setInterval()` to setup your periodic calls. http://www.w3schools.com/jsref/met_win_setinterval.asp — Sean3z, Feb 16 '14 at 15:37
How can `setInterval()` be used in the context of a `script` tag? — Adam Matan, Feb 16 '14 at 15:41
your script tag includes the code that calls setInterval, which executes a function every interval that makes the same AJAX request — thescientist, Feb 16 '14 at 15:42

score 1 · Accepted Answer · answered Feb 16 '14 at 15:45

1

Consider the following code. We're using setInterval to call our ping() function every 3 seconds.

<script type="text/javascript">
  function ping() {
    $.ajax({
      ...
    });
  }

  setInterval(function() {
    ping();
  }, 3000);
</script>

answered Feb 16 '14 at 15:45

Sean3z

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Thanks a bunch. Can the AJAX code inside the `script` tag be loaded from an external file? – Adam Matan Feb 16 '14 at 15:48
1

Sure; if you mean, including a `src` attribute instead of the code locally :) – Sean3z Feb 16 '14 at 15:50

How to make periodic AJAX calls to cross-domain server

1 Answers1