Thank you for the excellent summary! Relevant code snippets always
make life easier. :)
So far, you're testing whether response.get("getData").getData()
[owner.getId()]["setID"] is null. This will return an error if
response.get("getData").getData()[owner.getId()] is null. You should
be able to use this to your advantage: if
response.get("getData").getData()[owner.getId()] returns null, the
field has not been created for that person. Please let me know if this
works for you.
- Jason
On May 5, 4:36 pm, Sean <[EMAIL PROTECTED]> wrote:
> Hi there,
> I had problems figuring out whether the field I want to retrieve by
> newFetchPersonAppDataRequest actually existed or not.
> What I want to achieve here is that once the application is loaded, it
> will go fetch a specific field named "setID "under the Owner by
> calling newFetchPersonAppDataRequest.
> The returned value of that field thereafter will be used as the
> parameter of another function.
> If the value of that field is null or that field is not existed at
> all, then the application will call a function "OwnerRegister()" for
> the owner to set that value.
> So far, I can only differentiate the situation when the value is null
> but have no clue how to figure out whether that field has been created
> by the owner or not.
> If that field hasn't been created yet, FireBug will show the following
> Error "response.get("getData").getData()[owner.getId()] has no
> properties"
> I tried to capture this situation by inserting the hadError if
> statement "if (response.get("getData").hadError())"
> but it still didn't work out.
> Does anyone know how to handle this kind of situation?
> Thank you in advance.
>
> Below is the snippet of my application code.
>
> function getRequest() {
> var req = opensocial.newDataRequest();
> req.add(req.newFetchPersonRequest(
> opensocial.DataRequest.PersonId.OWNER),
> "getOwner");
> req.add(req.newFetchPersonAppDataRequest(
> opensocial.DataRequest.PersonId.OWNER,
> "setID"),
> "getData");
> req.send(getResponse);
>
> }
>
> function getResponse(response) {
> if (response.get("getOwner").hadError())
> {
> document.getElementById("error_response").innerHTML = "Cannot get
> Valid User Data.<br>";;
> return;
> }
> var owner = response.get("getOwner").getData();
>
> if (response.get("getData").hadError()){
> document.getElementById("error_response").innerHTML = " Errors:
> getData. Print out registeration form.<br>";
> ownerRegister();
> return;
> }
> var testData = response.get("getData").getData()[owner.getId()]
> ["setID"];
> if(testData == 'null') {
> ownerRegister();
> return;
> }
> var unescapedTestData = gadgets.util.unescapeString(testData);
> var testObject = gadgets.json.parse(unescapedTestData);
> XMLWebService(testObject);
>
> }
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