By - Angular - W3cubDocs

Predicates for use with DebugElement's query functions.

API

class By {
  static all(): Predicate<DebugNode>;
  static css(selector: string): Predicate<DebugElement>;
  static directive(type: Type<any>): Predicate<DebugNode>;
}

all

Predicate<DebugNode>

Match all nodes.

@returnsPredicate<DebugNode>

Usage notes

Example

debugElement.query(By.all());

css

Predicate<DebugElement>

Match elements by the given CSS selector.

@paramselectorstring

@returnsPredicate<DebugElement>

Usage notes

Example

debugElement.query(By.css('[attribute]'));

directive

Predicate<DebugNode>

Match nodes that have the given directive present.

@paramtypeType<any>

@returnsPredicate<DebugNode>

Usage notes

Example

debugElement.query(By.directive(MyDirective));