Might be this will be helpfull:
1. Create an action on model (to which that lookup field correspond).
2. In initialization, Select event as Update of a row, then select that lookup field.
3. in action, select run snippet action.
Write a java script as below:
var element = arguments[0],value = arguments[1],$ = skuid.$;
//Get model information
var leadmodel = skuid.model.getModel(“Lead”);
//Fetch first row of model.
var raw= leadmodel.getFirstRow();
// Get field value
var Lookupfiled=raw.lookupfieldAPI;
for(var a=0;a<numberoflookupvalues;a++){
// set array of string with semi-colon separated
}
}
