Angular error NG05101 means that none of the registered event manager plugins recognizes the event name used for a listener. Check the exact name in the error first: a typo is the common cause. If the event syntax is intentional and custom, Angular needs a plugin that recognizes and handles it.
What NG05101 means
Angular raises NG05101 when it cannot set up an event listener because no registered event manager plugin supports the event name. The error message includes the unrecognized name, so use it to locate the relevant template binding or host binding.
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Angular’s documented example is a misspelled keyboard modifier: (keyup.ente) should be (keyup.enter). The dot is not itself an error; Angular supports documented key modifiers, while other dotted or custom syntax must be recognized by a plugin.
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How to fix the error
1. Check the event name and modifier
Find the listener named in the error and compare its spelling and punctuation with the behavior you intended. For example, correct <input (keyup.ente)="onEnter()" /> to <input (keyup.enter)="onEnter()" />. Angular’s NG05101 error reference identifies a typo as the most common cause.
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2. Confirm that Angular supports the syntax
Angular event bindings use parentheses, as in (click) and (keydown). For keyboard events, the event-listener guide documents modifiers including alt, control, meta, and shift, key names such as enter, and the .code suffix for matching a physical key code. It also documents the global target prefixes window, document, and body.
If the event uses one of these supported forms, fix any spelling or syntax mismatch. If the name describes behavior outside the documented forms, Angular may need a custom plugin to recognize it.
3. Add a plugin for intentional custom syntax
For custom event behavior, Angular provides the EventManagerPlugin extension point. Implement supports(eventName) so the plugin recognizes the intended event names, and addEventListener(...) so it attaches the behavior and returns cleanup logic. Angular’s EventManagerPlugin API reference describes the class and these methods.
Register the plugin with the EVENT_MANAGER_PLUGINS injection token and a multi provider. The provider takes this form:
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{
provide: EVENT_MANAGER_PLUGINS,
useClass: DebounceEventPlugin,
multi: true,
}DebounceEventPlugin is an illustrative class name; the application must supply an implementation. Angular’s EVENT_MANAGER_PLUGINS API reference documents the token. The event-listener guide also describes custom plugins, including debounce-style syntax, as an extension to Angular’s event system.
Choose the repair that matches the event
| Situation | Repair |
|---|---|
| The event or modifier is misspelled, or a documented Angular event/key form expresses the desired behavior | Correct the binding; this does not require a custom plugin. |
| The application intentionally uses event syntax that no registered plugin recognizes | Implement a plugin that recognizes and handles that syntax, then register it with EVENT_MANAGER_PLUGINS as a multi provider. |
If considering a third-party plugin, verify that it supports both the exact event syntax and the Angular version used by the application. The cited Angular documentation explains the extension API but does not endorse a particular external package.
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