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API > @angular/platform-browser

By

Predicates for use with DebugElement's query functions.

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

Static methods

all()

Match all nodes.

 
      
      static all(): Predicate<DebugNode>
Parameters

There are no parameters.

Returns

Predicate<DebugNode>

Usage Notes

Example
      
      debugElement.query(By.all());

css()

Match elements by the given CSS selector.

 
      
      static css(selector: string): Predicate<DebugElement>
Parameters
selector string
Returns

Predicate<DebugElement>

Usage Notes

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

directive()

Match nodes that have the given directive present.

 
      
      static directive(type: Type<any>): Predicate<DebugNode>
Parameters
type Type<any>
Returns

Predicate<DebugNode>

Usage Notes

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