Hi,
No, you cannot use the backendApi in a mashup, since the backendApi is actually a part of the visualization.
The easiest way to make selections in a mashup is to use the field API. The select method is the one the corresponds to the selectValues method in an extension:
app.field('LastName').select([0, 1, 2], true, true);
Like the selectValues method it is based on using the numbers QIX engine sets on all values when you load your data (the array [1,2,3] in the example. You find those values in the field qElemNumber in the HyperCube data.
Other options include the selectMatch and toggleSelect methods where you do not need to have the qElemNumber but can use a string match.
app.field('LastName').selectMatch('A', true);
There is also the field.selectValues method, where you can make a selection on exact string or numeric values:
app.field('LastName').selectValues([{qText: "Andersson"},{qText:"Bush"},{qText:"Obama"}], true, true);
or a simplified syntax:
app.field('LastName').selectValues(["Andersson","Bush","Obama"], true, true);
Hope this helps
Erik
