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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallNG8111 means an Angular event binding refers to a function without calling it. Change a binding such as (click)="onClick" to (click)="onClick()" so Angular invokes the handler when the event occurs. If the handler needs the event details, pass $event, for example (keyup)="updateField($event)".
What NG8111 means
Angular’s NG8111 diagnostic reference describes this warning as detecting uninvoked functions in event bindings. In an event expression, writing a function’s name alone refers to the function; it does not call it. As a result, the handler does not run when the event fires.
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For example, the first button below contains a function reference, while the second contains a function call:
<!-- Function reference: triggers NG8111 -->
<button (click)="onClick">Click me</button>
<!-- Function call: invokes the handler on click -->
<button (click)="onClick()">Click me</button>How to fix the binding
-
Find the event binding named in the NG8111 warning, such as
(click),(keyup), or(keydown).#1 Best Overall
-
Check whether its expression names a function without parentheses. If so, add the call parentheses:
(click)="onClick()". -
If the handler needs information about the event, pass Angular’s
$eventvariable:(keyup)="updateField($event)". Angular’s event-listener guide documents both handler calls and access to$event.
Use the arguments the handler actually needs; adding $event is not required when the handler does not use event details.
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In a component template
Parentheses around an event name define an event listener, and the value is the statement Angular evaluates when the event occurs. Besides events such as click, keydown, and keyup, Angular supports key modifiers such as (keydown.enter) and (keydown.shift.enter), as well as global targets such as (window:keydown). The same invocation rule applies: write a function call when the event should invoke that function.
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On a component host
Host event bindings behave like event bindings in a component template. Angular’s host-elements guide recommends the component’s host property rather than @HostBinding and @HostListener, which it identifies as existing for backwards compatibility. Wherever the event binding is declared, ensure its expression calls the intended handler.
When Angular reports NG8111
NG8111 is an extended diagnostic. Angular requires strictTemplates to be enabled for extended diagnostics to be emitted; this specific check has no additional requirement. If the diagnostic is absent, its absence alone does not establish that the binding invokes the handler correctly.
You can suppress the check in angularCompilerOptions.extendedDiagnostics.checks by setting uninvokedFunctionInEventBinding to "suppress". Suppression hides the warning; it does not change the binding or make an uninvoked function run. For an event handler intended to execute, calling the function is the correction.
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NG8111 concerns whether a function is invoked. Separately, Angular’s Component API reference notes that an event-binding value is a statement and that if the statement evaluates to false, Angular applies preventDefault() to the DOM event. This behavior is distinct from the missing-call issue diagnosed by NG8111.
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