Group header in Angular Drop down list component

27 Sep 20234 minutes to read

The following example demonstrate about how to disable the Fixed group header in DropDownList through CSS by using visibility attribute.

app.component.ts

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    // specifies the template string for the DropDownList component
    template: `<ejs-dropdownlist id='ddlelement' #samples [dataSource]='data' [fields]='fields' [placeholder]='text' [popupHeight]='height'></ejs-dropdownlist>`,
    
})
export class AppComponent {
    constructor() {
    }
    // defined the array of data
    public data: { [key: string]: Object }[] = [
        { Vegetable: 'Cabbage', Category: 'Leafy and Salad', Id: 'item1' },
        { Vegetable: 'Spinach', Category: 'Leafy and Salad', Id: 'item2' },
        { Vegetable: 'Wheat grass', Category: 'Leafy and Salad', Id: 'item3' },
        { Vegetable: 'Yarrow', Category: 'Leafy and Salad', Id: 'item4' },
        { Vegetable: 'Pumpkins', Category: 'Leafy and Salad', Id: 'item5' },
        { Vegetable: 'Chickpea', Category: 'Beans', Id: 'item6' },
        { Vegetable: 'Green bean', Category: 'Beans', Id: 'item7' },
        { Vegetable: 'Horse gram', Category: 'Beans', Id: 'item8' },
        { Vegetable: 'Garlic', Category: 'Bulb and Stem', Id: 'item9' },
        { Vegetable: 'Nopal', Category: 'Bulb and Stem', Id: 'item10' },
        { Vegetable: 'Onion', Category: 'Bulb and Stem', Id: 'item11' }];
    // maps the appropriate column to fields property
    public fields: Object = { groupBy: 'Category', text: 'Vegetable', value: 'Id' };
    // set the placeholder to the DropDownList input
    public text: string = "Select a vegetable";
    // Set the popup list height
    public height: string = '200px';
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { DropDownListModule } from '@syncfusion/ej2-angular-dropdowns';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,FormsModule, DropDownListModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);