Variables¶
QField allows user to add and edit expression variables. These can be used for a wide range of applications, including data-defined symbology, setting default field values, controlling print layout and application behavior, and much more. See the relevant QGIS documentation for more information.
QField supports two main types of variables:
- Project Variables: Project-bound variables defined within the project file.
- Global Variables: Application-wide global variables with a set of read-only variables matching those found in QGIS.
Project Variables¶
Project variables are defined and managed directly within your QGIS project. They allow you to add custom variables that are only relevant in the context of a specific project. QField users can edit those variables, with modified values remembered across sessions.
Global Variables¶
New global variables can be added or modified once and will be injected into all projects opened in QField across sessions. Global variables can be used to add a unique identifier across a fleet of QField devices for example, or determine the language for a given QField user. Since they are not bound to specific projects and are defined locally, they make for a great way to customize experience for multiple users sharing the same projects.
Variable Management in QField¶
Variables are managed directly on your device and are accessible in all available QField projects. When you access the variables list in QField ( Settings > Variables ), you will find a consolidated and organized view of all available variables.
Variable configuration¶
QField界面
To configure a device-specific variable, follow these steps:
- Open Settings in QField.
- Navigate to the Variables tab.
Here you will see a list of all variables currently applicable to your project. To add a new variable:
- Click on Add a new variable at the bottom of the variable list.
- Enter the name and value for your new variable.
