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Angular error NG05101 means no registered event manager plugin recognizes the event name used by a listener. Check the exact event name in the error message first: a typo such as (keyup.ente) should be (keyup.enter). If the syntax is intentional and custom, provide an Angular event plugin that supports it.
What NG05101 means
Angular raises NG05101 when it tries to set up an event listener but none of the registered event manager plugins reports support for the event name. The error message includes the name Angular could not recognize, which points to the binding to inspect. See Angular’s NG05101 error reference.
Dots in an event name are not automatically invalid. Angular supports documented key modifiers such as .enter; the problem is a misspelled or unsupported name, or custom syntax for which no plugin is registered.
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How to fix NG05101
1. Check the exact event name for typos
Find the listener named in the error and compare its spelling and punctuation with the intended event. Angular’s example is <input (keyup.ente)="onEnter()" />, which should use (keyup.enter). A missing or misplaced character in a modifier can be enough to trigger NG05101.
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2. Confirm that the binding uses supported Angular syntax
Angular template event listeners use parentheses, for example (click) and (keydown). Its event-listener guide documents keyboard modifiers including alt, control, meta, and shift, key names such as enter, and the .code suffix for matching physical key codes. Global targets can be prefixed with window, document, or body. Check the Angular event-listener guide if the binding is meant to use one of these patterns.
3. Add a custom plugin for intentional custom syntax
If the event name represents custom behavior—for example, a debounced event—implement an EventManagerPlugin. Its supports(eventName) method should recognize the intended name, while addEventListener(...) attaches the behavior and returns cleanup logic. Angular describes this extension point in its EventManagerPlugin API reference.
Register the plugin through the EVENT_MANAGER_PLUGINS injection token as a multi provider:
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{
provide: EVENT_MANAGER_PLUGINS,
useClass: DebounceEventPlugin,
multi: true,
}Angular’s event-listener guide documents this registration approach and explains that the event system is extensible through custom plugins. The token is documented in the EVENT_MANAGER_PLUGINS API reference. If using a third-party plugin, confirm that it supports the exact event syntax and Angular version in your application.
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Choose the repair that matches the binding
| Situation | Repair |
|---|---|
| The event name or key modifier is misspelled | Correct the spelling or punctuation, such as changing (keyup.ente) to (keyup.enter). |
| The intended behavior matches a documented Angular event or key modifier | Use the supported binding syntax rather than inventing a custom event name. |
| The application intentionally uses custom event semantics | Implement and register an EventManagerPlugin whose supports method recognizes that syntax. |
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