An approach to making AJAX services available cross Domain

rdanner — Tue, 25 Sep 2007 07:29:42 GMT

Gents, Ladies,I recently did a proof of concept for a restful web service with a companion set of java script libraries on top of it that I wanted to be cross domain. As you may know AJAX has a security constraint that ensures you cannot make asynchronous calls to domains from which the original pa

Re: An approach to making AJAX services available cross Domain

davidc — Wed, 26 Sep 2007 12:40:24 GMT

Thanks Russ. The approach described works well with Alfresco's Web Scripts which support the "callback" method in conjunction with JSON responses.

From http://wiki.alfresco.com/wiki/Web_Scripts#JSON_Callbacks …

If your Web Scripts provide JSON responses, it's likely they'll be invoked directly from within a Web Browser via the XMLHttpRequest object. However, due to security reasons, you may run into cross-domain issues, a restriction that requires you to proxy your requests on the server side. Typically, to "workaround" these issues, public services such as Yahoo! JSON Services provide a callback mechanism.

Web Scripts also provide this mechanism which is invoked by adding the following URL parameter on JSON URL requests:

alf_callback=function

where function is the name of a client-side javascript function to be invoked.

The following simple HTML page demonstrates this:

<html>
  </body>
    <script>
      function showTitle(res)
      {
        alert(res.feed.title);
      }
    </script>
    <script src="http://localhost:8080/alfresco/service/sample/blog/category/web20.json&alf_callback=showTitle'/>
  </body>
</html>
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An approach to making AJAX services available cross Domain

Re: An approach to making AJAX services available cross Domain