reactjs - Warning: Received `false` for a non-boolean attribute. How do I pass a boolean for a custom boolean attribute?

Reactjs - Warning: Received `false` for a non-boolean attribute. How do I pass a boolean for a custom boolean attribute?

When working with custom boolean attributes in React, you may encounter the warning "Received false for a non-boolean attribute." This warning is usually related to how JSX handles boolean attributes.

To properly pass a boolean value for a custom boolean attribute, you can follow these guidelines:

  1. Use a JSX Expression: When you pass a boolean value as a prop to a custom boolean attribute, you need to use a JSX expression.

    Example:

    // Incorrect <MyComponent customAttribute={false} /> // Correct <MyComponent customAttribute={true} /> // or <MyComponent customAttribute={someBooleanVariable} />

    In the correct example, the value is wrapped in curly braces ({}) to create a JSX expression.

  2. Omit the Attribute for true: If the custom boolean attribute is true, you can omit the attribute altogether. React will treat the presence of the attribute as true.

    Example:

    // Attribute is omitted for `true` <MyComponent customAttribute />

    This is a shorthand for <MyComponent customAttribute={true} />.

  3. Use a Conditional Expression: If you want to conditionally include the attribute based on some condition, you can use a conditional expression.

    Example:

    <MyComponent customAttribute={condition ? true : false} />

    Here, condition is a variable or expression that evaluates to a boolean.

Make sure that the custom boolean attribute is correctly defined in your component and that you are using it consistently. The warning usually occurs when there is a mismatch between the expected boolean attribute behavior and how it is being passed.

Examples

  1. "React boolean attribute custom prop warning"

    • Code Implementation:
      const MyComponent = () => { const customBooleanProp = true; return <div customBooleanProp={customBooleanProp}>Content</div>; };
      • Description: Pass a boolean value directly for a custom boolean attribute to avoid the warning.

  2. "React boolean attribute prop with dynamic value"

    • Code Implementation:
      const MyComponent = () => { const customBooleanProp = someCondition ? true : false; return <div customBooleanProp={customBooleanProp}>Content</div>; };
      • Description: Use a dynamic value (e.g., based on a condition) for a custom boolean attribute while ensuring it is a boolean.

  3. "React boolean attribute with JSX spread operator"

    • Code Implementation:
      const MyComponent = () => { const customBooleanProp = true; const otherProps = { customBooleanProp }; return <div {...otherProps}>Content</div>; };
      • Description: Spread the props with the JSX spread operator and include the custom boolean attribute.

  4. "React boolean attribute prop with explicit boolean conversion"

    • Code Implementation:
      const MyComponent = () => { const customBooleanProp = Boolean(someValue); return <div customBooleanProp={customBooleanProp}>Content</div>; };
      • Description: Use Boolean() to explicitly convert a value to a boolean for a custom boolean attribute.

  5. "React boolean attribute prop in JSX curly braces"

    • Code Implementation:
      const MyComponent = () => { const customBooleanProp = true; return <div { ...{ customBooleanProp } }>Content</div>; };
      • Description: Use JSX curly braces with the spread operator to include a boolean attribute in the JSX element.

  6. "React boolean attribute prop with string value"

    • Code Implementation:
      const MyComponent = () => { const customBooleanProp = 'true'; return <div customBooleanProp={customBooleanProp}>Content</div>; };
      • Description: Ensure the value for a boolean attribute is an actual boolean (true or false), not a string representation.

  7. "React boolean attribute with defaultProps"

    • Code Implementation:
      const MyComponent = ({ customBooleanProp }) => ( <div customBooleanProp={customBooleanProp}>Content</div> ); MyComponent.defaultProps = { customBooleanProp: true, };
      • Description: Use defaultProps to set a default value for a custom boolean attribute in a functional component.

  8. "React boolean attribute with propTypes"

    • Code Implementation:
      import PropTypes from 'prop-types'; const MyComponent = ({ customBooleanProp }) => ( <div customBooleanProp={customBooleanProp}>Content</div> ); MyComponent.propTypes = { customBooleanProp: PropTypes.bool.isRequired, };
      • Description: Use propTypes to specify the type of the custom boolean attribute and ensure it is a boolean.

  9. "React boolean attribute with data- prefix"

    • Code Implementation:
      const MyComponent = () => { const customBooleanProp = true; return <div data-custom-boolean-prop={customBooleanProp}>Content</div>; };
      • Description: Use the data- prefix for custom attributes to avoid React warnings and ensure correct behavior.

  10. "React boolean attribute with aria- prefix"

    • Code Implementation:
      const MyComponent = () => { const customBooleanProp = true; return <div aria-custom-boolean-prop={customBooleanProp}>Content</div>; };
      • Description: Use the aria- prefix for custom boolean attributes related to accessibility to ensure proper handling and avoid warnings.

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