Change the Value of an Extendable Constant
Constants may be used in dependencies to allow you to change the appearance of components and determine app behavior, such as changing component properties or enabling a feature in the page.
To change the value of an extendable constant:
- Do either of the following:
- Select the component on the page to open the details for the component in the Properties pane. In this example, a constant is used to store the text for a Heading component that is visible in the Page Designer. You can change the heading by changing the constant's value:
- Open the Constants tab in the Properties pane. In this example, the Constants tab lists constants used in the page, but there is no component visible in the Page Designer. The constants are used to control elements in the page, for example, to control how components are rendered, or to enable and disable some function in the page.
- Click the constant to see its details in the Properties pane.
- Click the constant to see its details in the Properties pane.
- Select the component on the page to open the details for the component in the Properties pane. In this example, a constant is used to store the text for a Heading component that is visible in the Page Designer. You can change the heading by changing the constant's value:
- Change the constant's value in the Properties pane by selecting a value in the dropdown menu or entering a value in the Values field.
You can move your cursor over the tooltip icon to see details about the constant. In this example, the description states that the constant is used to enable inline editing of a table.
To change the value of the constant, do one of the following:
- Set a static value for the constant by typing a new value in the Value field.
- Select a value using the UI component. For some constants, the Properties pane might display a component for selecting the value, for example, a date picker component for selecting a date. When the constant is a boolean, you might see a menu to select "true" or "false".
- Set the value to a constant or variable. You can click the arrow above the field to open the Variables picker and select a variable:
You can click Create Variable in the Variables picker to create a variable, if needed.
- Set the value to an expression. You can click
above the field to open the Expression Editor. To write efficient expressions that handle situations where a referenced field might not be available or the field's value could be null, see How To Write Expressions If a Referenced Field Might Not Be Available Or Its Value Could Be Null.
In the Expression Editor, you can select variables in the left pane to add them to your expression. You can also add text strings to your expression by typing in the editor.
