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To pre-populate a single form select list from an external source, choose the select field and click on 'Edit'.

Under the 'Choose Options Binder' menu, click on the 'Bean Shell Form Binder' from in the Options Binder select field.

Under the 'Configure Bean Shell Form Binder', enter your Bean shell script to populate the select fields. For each row that you add to the FormRowSet, be sure to put the 'FormUtil.PROPERTY_VALUE' and 'FormUtil.PROPERTY_LABEL' fields into in the FormRow that will be added into to the FormRowSet. 

Code Block
import org.joget.apps.form.model.*;
import org.joget.apps.form.service.*;

public FormRowSet test() {
FormRowSet f = new FormRowSet();
f.setMultiRow(true);

FormRow r1 = new FormRow();
r1.put(FormUtil.PROPERTY_VALUE, "test1");
r1.put(FormUtil.PROPERTY_LABEL, "tester1");
f.add(r1);

FormRow r2 = new FormRow();
r2.put(FormUtil.PROPERTY_VALUE, "test2");
r2.put(FormUtil.PROPERTY_LABEL, "tester2");
f.add(r2);

return f;
}

return test();

Of course, you would want to want to populate the values for the PROPERTY_LABEL and PROPERTY_VALUE from your external datasource. For more information on how you would to connect to a database source, see the example code within 'Pre-populate Form Fields with Data from External Source'.