The Tool Desk
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Bind an event in an Angular template
Put the event name in parentheses and assign it a method call or other listener statement:
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<button (click)="save()">Save</button>Angular invokes the statement when the element emits that event. Common examples include click, keydown, and mouseover. The parentheses identify an event binding; they are distinct from property binding syntax such as [value]. Angular’s event-listener guide documents the syntax and examples.
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Read the event object with $event
Pass $event to the handler when it needs information about the event, such as the key pressed or the target element:
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<input (keyup)="updateField($event)" />Type the handler argument to match the event you handle. For keyboard input, that can be KeyboardEvent; a handler can then inspect properties such as key.
Listen for a particular key
For common keyboard cases, add key modifiers after the event name, separated by periods:
<input (keyup.enter)="submit()" />
<input (keyup.shift.enter)="submit()" />Angular supports modifier names including alt, control, meta, and shift. By default, key filters match keyboard key values—the meaning of a key, which can vary with layout or modifier state. Add the code suffix when you need to match a physical or virtual key code instead. See Angular’s event-listener guide and the HostListener API reference for modifier details.
Handle events on a component or directive host
When the event belongs to the component or directive’s host element, declare it in the decorator’s host property:
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@Component({
host: {
'(click)': 'handleClick($event)',
'(window:keydown.enter)': 'handleEnter($event)',
},
})
export class Example {}Global target prefixes documented by Angular are window:, document:, and body:. Angular’s current API guidance says to prefer the host property over @HostListener; the decorator remains documented for backwards compatibility. Angular’s HostListener API reference states: “Always prefer using the host property over @HostListener. This decorator exist exclusively for backwards compatibility.”
Prevent the browser’s default action
If the handler is replacing what the browser would normally do, call preventDefault() explicitly:
handleSubmit(event: Event) {
event.preventDefault();
// Handle the action in your application.
}Angular also calls preventDefault() if a listener statement evaluates to false, but an explicit call makes the intent clearer. Angular’s event-listener guide documents both behaviors.
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Use template bindings or host metadata for ordinary component interactions: they express the event declaratively at the element or host where it belongs. Use an imperative listener only when the behavior genuinely needs direct DOM access. Renderer2.listen(target, eventName, callback) returns an unlisten function; retain and call that function when the registered listener should be disposed of.
Angular’s DOM APIs guide describes Renderer2’s special uses as narrow, including animation-related operations. It also states that Renderer2 DOM APIs do not support DOM manipulation in server-side rendering or build-time pre-rendering contexts. The documentation does not establish a complete, cross-version lifecycle recipe for every imperative native-listener scenario, so choose and manage such listeners according to the specific API and rendering context in your Angular version.
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