The Blank function in PowerApps is used to create a blank value. This function is useful for initializing variables, resetting form fields, and handling null values. A blank value is different from an empty string or zero; it specifically represents the absence of a value.
PowerApps – Blank() Syntax
Notes:
- The Blank function does not take any arguments. - A blank value is different from an empty string (""). - Use IsBlank to check for blank values and IsEmpty to check for empty collections or tables. - Ensure that your data source supports blank values. Some data sources might treat blank values differently or not support them at all. PowerApps – Initialize variable to blank value
To initialize a variable named MyVariable to a blank value:
PowerApps - Reset a Text Input Control using Blank() function
To reset the text input control named TextInput1 to a blank value:
TextInput1.Text = Blank()
To clear a specific field in a form:
UpdateContext({ FormField: Blank() })
PowerApps – Handle Optional Fields using Blank() function
When dealing with optional fields in a dataset, use Blank to represent the absence of a value:
Patch(DataSource, Defaults(DataSource), { OptionalField: Blank() })