Question

how to avoid cross domain policy in jquery ajax for consuming wcf service??

What chages do i need to do in web.config for cross domain policy?

Answer 1

If you want cross domain calls from javascript to WCF you must use JSONP. To add JSONP support to WCF you must define it in WebHttpBinding. The configuration should look like:

<bindings>
  <webHttpBinding>
    <binding name="crossDomain" crossDomainScriptAccessEnabled="true" />
  </webHttpBinding>
</binding>
<behaviors>
  <endpointBehavior>
    <behavior name="restBehavior">
      <webHttp />
    </behavior>
  </endpointBehavior>
</behaviors>
<services>
  <service name="...">
    <endpoint address="" binding="webHttpBinding" bindingConfiguration="crossDomain"
              contract="..." behaviorConfigurations="restBehavior" /> 
  </service>
</services>

For jQuery part check for example this article.