I have a mashup with a repeater which got his data from a function that returns an Infotable. Now I want to disable a button if nothing is selected in the repeater or if the repeater is empty. I have tried using a Validator or expression that looks if one of the properties for the infotable selected rows is null, undefined, "" or unknown but nothing give the correct result.
I have found that it seems to be that the variable from the infotable seems to go in an unknown state or something depending on the action perfomed. If you show the value from the infotable in a label it is empty but for the expression or validator it doesn't seem to be empty. I have found a solution to put the value from the infotable in a textbox (and hide it) and then use this value in my expression and that way it is always has same state namely empty when it needs to be.
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