Providing error messages

Brightspot provides convenient APIs for displaying data validation and other error messages on the content edit form.

• Use IllegalArgumentException to display error messages at the top of the content edit form.
• Use State#addError to display error messages above a field.

showLineNumbers {9,12,14,15,20}

1
import com.psddev.cms.db.Content;
2
import com.psddev.cms.db.ToolUi;
3
import com.psddev.dari.db.State;
4

5
public class Galaxy extends Content {
6

7
    private String name;
8

9
    @ToolUi.Note("(light years)")
10
    private String distanceFromEarth;
11

12
    protected void beforeSave() {
13
        try {
14
            Float.parseFloat(getDistance());
15
        } catch (NumberFormatException e) {
16
            State state = getState();
17
            state.addError(
18
                 state.getField("distanceFromEarth"),
19
                 "Distance must be an integer (1234) or a floating-point number (1234.32)");
20
            throw new IllegalArgumentException("Resolve the errors listed below, then click Publish.");
21
        }
22
    }
23

24
    public String getDistance() {
25
        return distanceFromEarth;
26
    }
27

28
}

• 9. Declares a field for entering a distance.
• 12. Performs data validation prior to saving the object. Brightspot provides several callback methods with which you can perform validation.
• 14. Checks if the editor entered a number.
• 15. Displays a detailed error message above the field distanceFromEarth.
• 20. Displays a general error message at the top of the content edit form.