jqwidgets-framework/demos/Angular/src/complexinput/validation/app.component.html

jQWidgets is an advanced Angular, Vue, Blazor, React, Web Components, jquery, ASP .NET MVC, Custom Elements and HTML5 UI framework.

<jqxComplexInput #myComplexInput
    [width]="250" [height]="25" [value]="'15 + 7.2i'" [spinButtons]="true">
</jqxComplexInput>

<br />
<div style="margin-top: 20px"></div>

<jqxButton (onClick)="btnOnClick()" [width]="200">
   Set wrong value: "11- 2ii"
</jqxButton>