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Overview

HasAllowedCharPatternElement provides utilities to interact with Vaadin input components that support the allowedCharPattern property. This property constrains which characters users can type into the field by specifying a regular expression pattern. This mixin interface extends HasLocatorElement and provides default implementations for getting, setting, and asserting the allowed character pattern.

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Interface

public interface HasAllowedCharPatternElement extends HasLocatorElement {
    default String getAllowedCharPattern() { ... }
    default void setAllowedCharPattern(String pattern) { ... }
    default void assertAllowedCharPattern(String pattern) { ... }
}

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Methods

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getAllowedCharPattern()

Retrieves the current allowedCharPattern from the component. 
default String getAllowedCharPattern()
Returns: The pattern string, or null if no pattern is set Implementation: 
return getLocator().evaluate("el => el.allowedCharPattern").toString();

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setAllowedCharPattern()

Sets the allowedCharPattern on the component programmatically. 
default void setAllowedCharPattern(String pattern)
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pattern
String
Regular expression pattern to apply. For example, "[0-9]" allows only digits, "[A-Za-z]" allows only letters.
Implementation: 
getLocator().evaluate("(el, p) => el.allowedCharPattern = p", pattern);

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assertAllowedCharPattern()

Asserts that the allowedCharPattern matches the expected value. 
default void assertAllowedCharPattern(String pattern)
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pattern
String
Expected pattern string. If null, asserts that no pattern is set.
Behavior:
  • If pattern is non-null: Asserts the component has exactly that pattern
  • If pattern is null: Asserts the attribute is absent

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Implementing Classes

The following element classes implement HasAllowedCharPatternElement:
  • TextFieldElement - Text input fields
  • BigDecimalFieldElement - Decimal number fields
  • AbstractNumberFieldElement - Base class for number fields
  • ComboBoxElement - Combo box selectors (with text input)
  • MultiSelectComboBoxElement - Multi-select combo boxes

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Usage Examples

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Restricting Input to Digits

import com.microsoft.playwright.Page;
import org.vaadin.addons.dramafinder.element.TextFieldElement;

public class DigitsOnlyExample {
    public void testDigitsOnlyField(Page page) {
        TextFieldElement phoneField = TextFieldElement.getByLabel(page, "Phone");
        
        // Set pattern to allow only digits
        phoneField.setAllowedCharPattern("[0-9]");
        
        // Verify the pattern is applied
        phoneField.assertAllowedCharPattern("[0-9]");
        
        // Try to enter invalid characters - they should be rejected
        phoneField.fill("abc123");
        phoneField.assertValue("123"); // Only digits are kept
    }
}

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Restricting Input to Letters

public class LettersOnlyExample {
    public void testLettersOnlyField(Page page) {
        TextFieldElement nameField = TextFieldElement.getByLabel(page, "Name");
        
        // Set pattern to allow only letters and spaces
        nameField.setAllowedCharPattern("[A-Za-z ]");
        
        // Verify the pattern
        String pattern = nameField.getAllowedCharPattern();
        assertEquals("[A-Za-z ]", pattern);
    }
}

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Testing Pattern Validation

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

public class AllowedCharPatternIT {
    @Test
    public void shouldRestrictToNumericInput() {
        TextFieldElement quantityField = TextFieldElement.getByLabel(page, "Quantity");
        
        // Apply numeric-only pattern
        quantityField.setAllowedCharPattern("[0-9]");
        quantityField.assertAllowedCharPattern("[0-9]");
        
        // Attempt to type letters - should be blocked
        quantityField.click();
        page.keyboard().type("abc");
        
        // Field should remain empty
        quantityField.assertValue("");
        
        // Type valid digits - should work
        page.keyboard().type("42");
        quantityField.assertValue("42");
    }
    
    @Test
    public void shouldAllowCustomPattern() {
        TextFieldElement codeField = TextFieldElement.getByLabel(page, "Code");
        
        // Allow only uppercase letters and digits
        codeField.setAllowedCharPattern("[A-Z0-9]");
        
        // Get and verify the pattern
        assertEquals("[A-Z0-9]", codeField.getAllowedCharPattern());
        
        // Assert using built-in method
        codeField.assertAllowedCharPattern("[A-Z0-9]");
    }
    
    @Test
    public void shouldHandleNoPattern() {
        TextFieldElement freeTextField = TextFieldElement.getByLabel(page, "Comments");
        
        // Assert no pattern is set
        freeTextField.assertAllowedCharPattern(null);
        
        // Field should accept any input
        freeTextField.fill("Any text 123 !@#");
        freeTextField.assertValue("Any text 123 !@#");
    }
}

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ComboBox with Pattern

import org.vaadin.addons.dramafinder.element.ComboBoxElement;

public class ComboBoxPatternExample {
    public void testComboBoxPattern(Page page) {
        ComboBoxElement productCode = ComboBoxElement.getByLabel(page, "Product Code");
        
        // Restrict manual input to alphanumeric characters
        productCode.setAllowedCharPattern("[A-Za-z0-9-]");
        
        // Verify pattern is set
        productCode.assertAllowedCharPattern("[A-Za-z0-9-]");
        
        // User can still select from dropdown, but manual typing is restricted
        productCode.clickInput();
        page.keyboard().type("ABC-123"); // Valid
        page.keyboard().type("@#$");     // Ignored
    }
}

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Programmatic Pattern Changes

public class DynamicPatternExample {
    public void testDynamicPattern(Page page) {
        TextFieldElement inputField = TextFieldElement.getByLabel(page, "Input");
        
        // Start with digits only
        inputField.setAllowedCharPattern("[0-9]");
        inputField.fill("123");
        inputField.assertValue("123");
        
        // Change to letters only
        inputField.setAllowedCharPattern("[A-Za-z]");
        inputField.fill("ABC");
        inputField.assertValue("ABC");
        
        // Remove pattern restriction
        inputField.setAllowedCharPattern(null);
        inputField.assertAllowedCharPattern(null);
        inputField.fill("Any123!@#");
        inputField.assertValue("Any123!@#");
    }
}

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Common Patterns

Here are some commonly used character patterns:
PatternDescriptionExample
[0-9]Digits only0123456789
[A-Za-z]Letters onlyABCabc
[A-Z]Uppercase lettersABC
[a-z]Lowercase lettersabc
[A-Za-z0-9]AlphanumericABC123
[A-Za-z ]Letters and spacesHello World
[0-9.]Decimal numbers123.45
[0-9-]Digits and hyphens123-456
[A-Za-z0-9_-]Alphanumeric with underscore/hyphenmy-value_123

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Important Notes

  • The pattern is applied per character as the user types
  • Characters that don’t match the pattern are silently ignored
  • The pattern does not validate the entire value, only individual characters
  • For full value validation, use Vaadin’s validator mechanisms in addition to allowedCharPattern
  • The pattern uses JavaScript regex syntax (same as HTML5 pattern attribute)

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Vaadin Documentation

For more information about the allowedCharPattern property, see:

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