Let’s say on the MOSS 2007 web part page or SharePoint 2010 wiki page, you would like to use the filter web parts to filter the data in another web parts on the page and planning to use the Filter Actions web part to apply the filters on the page. If you don’t see the Filter Actions web part (i.e. Apply Filter button) on the page, make sure at least one of the filter Web Parts is connected to another connectable Web Part.
I have just spent more than half an hour. In past, I have used these web parts but I must have connected filter web parts prior to using the Filter Actions Web Part. This time I have added both web parts at the same time, didn’t connected any filter web parts, and wanted to organize the web parts on the page layout to preview them on the page. First thing I have noticed that Filter Actions web part is invisible on the page. I spent more than half an hour to browse through the Filter Actions web part properties to see what makes it invisible and finally found out that it requires filter web parts connected to the connectable web parts as pre-requisites. I am not sure why Microsoft implemented that way. In grand schema, it make sense that Filter Actions Web Parts works in conjunction with the Filter Web Parts and Filter Web Parts won’t work without getting connected to the connectable web parts but what if as a site designer, you wanted to layout the web parts before configuring the connection and preview the page.
Isn’t this real world scenario?