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Change caret icon

Dropdown arrow can be customized on popup open and close. It can be handled in beforeOpen and beforeClose event.

In the following example, the up arrow is updated on popup close and down arrow is updated on popup open using beforeOpen and beforeClose event by adding and removing e-caret-up class.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, ViewChild } from '@angular/core';
import { ItemModel, BeforeOpenCloseMenuEventArgs, DropDownButtonComponent  } from '@syncfusion/ej2-angular-splitbuttons';

@Component({
    selector: 'app-root',
    template: `<!-- To render DropDownButton. -->
               <button ejs-dropdownbutton #dropdownbutton [items]='items' content='Clipboard' (beforeOpen)='beforeOpen($event)' (beforeClose)='beforeClose($event)'></button>`
})

export class AppComponent {
   @ViewChild('dropdownbutton')
   public dropdownbutton: DropDownButtonComponent;
   // Initialize action items.
   public items: ItemModel[] = [
    {
        text: 'Cut'
    },
    {
        text: 'Copy'
    },
    {
        text: 'Paste'
    }];
    // To update up arrow with `e-caret-up` class.
    public beforeOpen (args: BeforeOpenCloseMenuEventArgs) {
        this.dropdownbutton.cssClass = 'e-caret-up';
    }
    // To remove `e-caret-up` class.
    public beforeClose (args: BeforeOpenCloseMenuEventArgs) {
        this.dropdownbutton.cssClass = '';
    }

}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { DropDownButtonModule } from '@syncfusion/ej2-angular-splitbuttons';
import { AppComponent } from './app.component';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        DropDownButtonModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);