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PowerApps Validate data against datasource


The Validate function in Power Apps is used to check whether a record (or changes to a record) complies with the validation rules defined in your data source. This function is particularly useful for ensuring data integrity before submitting or saving changes to a data source.

PowerApps – Validate() function Syntax

Validate(DataSource, DataRecord [, Column])

  • DataSource: The data source that contains the validation rules.
  • DataRecord: The record or changes to validate against the data source's rules.
  • Column (optional): The specific column to validate. If omitted, the entire record is validated.

Notes:

  1. Error Messages: Customize error messages to provide clear and specific feedback to users about validation issues.
  2. Validation Rules: Understand the validation rules defined in your data source to effectively use the Validate function.
  3. Combining with Other Functions: Combine the Validate function with conditional logic and error handling functions like IfError for robust validation processes.
  4. Data Integrity: Ensure data integrity by validating user inputs before saving them to the data source.
  5. User Feedback: Provide immediate feedback to users about validation errors, improving the user experience.
  6. Form Validation: Integrate validation into form submission processes to prevent invalid data from being submitted.

PowerApps - Validate a Single Column

Suppose you have a data source named Employees with a column Email that has a specific format validation rule, and you want to validate the Email before saving it.

  1. Add a Text Input Control for Email:
    • Insert a Text Input control named EmailInput.
  2. Add a Label Control to Display Validation Message:
    • Insert a Label control named ValidationMessage.
    • Set the Visible property of the Label to:

!IsBlank(ValidationMessage.Text)

  1. Add a Button Control to Validate Email:
    • Insert a Button control named ValidateButton.
    • Set the Text property of the Button to "Validate Email".
    • Set the OnSelect property of the Button to:

Set(ValidationResult, Validate(Employees, {Email: EmailInput.Text}, "Email"));

 

If(IsBlank(ValidationResult),

    Set(ValidationMessage.Text, "Email is valid"),

    Set(ValidationMessage.Text, ValidationResult)

)

When the button is clicked, it validates the email entered in the EmailInput control and displays an appropriate message in the ValidationMessage label.

PowerApps - Validate Multiple Columns

Suppose you want to validate multiple columns, such as Email and PhoneNumber, before saving a record.

  1. Add Text Input Controls for Email and Phone Number:
    • Insert a Text Input control named EmailInput.
    • Insert another Text Input control named PhoneInput.
  2. Add a Label Control to Display Validation Message:
    • Insert a Label control named ValidationMessage.
    • Set the Visible property of the Label to:

!IsBlank(ValidationMessage.Text)

  1. Add a Button Control to Validate the Record:
    • Insert a Button control named ValidateButton.
    • Set the Text property of the Button to "Validate Record".
    • Set the OnSelect property of the Button to:

Set(ValidationResult, Validate(Employees, {Email: EmailInput.Text, PhoneNumber: PhoneInput.Text}));

 

If(IsBlank(ValidationResult),

    Set(ValidationMessage.Text, "Record is valid"),

    Set(ValidationMessage.Text, ValidationResult)

)

When the button is clicked, it validates the Email and PhoneNumber fields and displays the validation result in the ValidationMessage label.

PowerApps - Conditional Validation Before Submitting a Form

Suppose you have a form for adding or updating employee records, and you want to validate the data before submitting the form.

  1. Add a Form Control:
    • Insert a Form control named EmployeeForm.
    • Set the DataSource property of the form to Employees.
  2. Add a Button Control to Submit the Form:
    • Insert a Button control named SubmitButton.
    • Set the Text property of the Button to "Submit".
  3. Add a Label Control to Display Validation Message:
    • Insert a Label control named ValidationMessage.
    • Set the Visible property of the Label to:

!IsBlank(ValidationMessage.Text)

  1. Set the OnSelect Property of the Submit Button:
    • Set the OnSelect property of the Button to:

Set(ValidationResult, Validate(Employees, EmployeeForm.Updates));

If(IsBlank(ValidationResult),

    SubmitForm(EmployeeForm),

    Set(ValidationMessage.Text, ValidationResult)

)

This will validate the data in the EmployeeForm before submitting it. If the data is valid, the form is submitted; otherwise, the validation message is displayed in the ValidationMessage label.


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