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POOpen social viewer state (isOwner)
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copied!<p>We are creating a gadget for the opensocial API 0.7. In some functions we have to decide, if the viewer is the owner.</p> <p>We couldn't use the usual function for this purpose:<br> <code>return gadgets.util.getUrlParameters().viewer == gadgets.util.getUrlParameters().owner;</code> so we had to create a workaround and get the information via a DataRequest.</p> <p>The DataRequest calls a callback function and has no useable return value. We tried a quick hack by using global variables to set the corresponding value.</p> <p>The issue at this point is, that the function does not 'wait' for the callback-function to be finished. We know this is no good code/style at all, but we tried to force a timeout for debug reasons.</p> <p>Handling all the code within the callback-function (as suggested in the examples of the opensocial docs) is not possible. We are looking for something like a real 'sleep()' in JavaScript to wait for the callback-function to complete or another alternative to get the owner information about the viewer.</p> <pre><code>globalWorkaroundIsOwner = false; function show_teaser(){ if (current_user_is_owner()){ // ... } // ... } function current_user_is_owner() { var req = opensocial.newDataRequest(); req.add(req.newFetchPersonRequest(opensocial.DataRequest.PersonId.VIEWER), 'viewer'); // This will set the the correct value req.send( user_is_owner_workaround ); // This is an attempt to delay the return of the value. // An alert() at this point delays the return as wanted. window.setTimeout("empty()", 2000); // This return seems to be called too early (the variable is false) return globalWorkaroundIsOwner; } function user_is_owner_workaround(dataResponse) { var viewer = dataResponse.get('viewer').getData(); globalWorkaroundIsOwner = viewer.isOwner(); // value is correct at this point } </code></pre>

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