jqwidgets-scripts-custom/demos/Angular/complexinput/spinbuttons/src/app/app.component.html

jQWidgets is an advanced jQuery, Angular 7, Vue, React, ASP .NET MVC, Custom Elements and HTML5 UI framework.

<jqxComplexInput [theme]="'material'" 
    [width]="250" [height]="25" [value]="'15 + 7.2i'" 
    [spinButtons]="true" [spinButtonsStep]="1">
</jqxComplexInput>