DataFormWebpart WebUrl Dynamic DefaultValue

Question

I'm trying to dynamically generate the WebUrl for a DataFormWebPart so that it uses the parent URL instead of a hardcoded value.

<WebPartPages:DataFormParameter Name="WebURL" ParameterKey="WebURL" PropertyName="ParameterValues" DefaultValue="/sites/test/"/>

I can't use / as the WebUrl as the parent site is located at /site/test/, but this value could change depending on where the subsite is deployed.

The question is, can this DefaultValue be dynamically generated? I tried DefaultValue="../" but that doesn't seem to work.

Answer 1

Assuming you're deploying the DataFormWebPart through Elements.xml and <AllUserWebParts> element, you can use ~sitecollection and ~site tokens in order to get current site collection and current site URLs respectively. You can find some details and example code on this here.

Another approach could be to fix WebUrl parameter default value in FeatureActivated receiver programmatically. For this, you should instantiate SPLimitedWebPartManager for your page in the feature receiver, find your webpart, and retrieve SPDataSource from DataFormWebPart.DataSources property, and then update the DataFormParameter objects from SelectParameters, UpdateParameters, DeleteParameters and InsertParameters collections.

Answer 2

not sure how your implementing your web part, but this will give you the current site url:

    public string getCurrentSite()
    {
        string currentSite = SPContext.Current.Web.Url;
        return currentSite;
    }

also, you might want to check into this: http://philwicklund.com/Lists/Posts/Post.aspx?ID=5