Angular PrimeNG Form 多选择模板组件

Angular PrimeNG是一个开源框架，它有丰富的原生Angular UI组件，可以用来做很好的造型，这个框架用来做响应式网站非常容易。在这篇文章中，我们将看到Angular PrimeNG中的表格多选模板组件，同时了解提供的各种模板及其语法，在代码示例中会用到。

MultiSelect组件用于从菜单中选择多个值。Angular PrimeNG表格提供了各种模板，以便以一种结构化的方式组织起来，并可以进行分组，以便对表格进行分类。

Angular PrimeNG Form MultiSelect Templates Component：

item。它用于定义菜单上的项目。
group。它用于定义菜单的组别。
selectedItems。它用于定义菜单的选定项目。
header（标题）。它用于定义菜单的页眉。
filter。它用于定义菜单的过滤器。
empty。它用于定义一个空项目。
emptyfilter。它用于过滤空菜单。
footer:它用于定义菜单的页脚。
loader。它用于定义菜单的加载器。

创建Angular应用程序和模块安装。

使用以下命令创建一个Angular应用程序。

ng new appname

在创建你的项目文件夹即appname后，使用以下命令移动到它。

cd appname

npm install primeng --save
npm install primeicons --save

项目结构：安装成功后，将出现以下项目结构。

Angular PrimeNG Form MultiSelect Templates Component

实例1：本实例演示了Angular PrimeNG中Form MultiSelect Templates Component的基本使用。

app.component.html:

<div style="text-align:center">
    <h1 style="color:green;">GeeksforGeeks</h1>
    <h3>A computer science portal for geeks</h3>
    <h4>
          Angular PrimeNG Form MultiSelect
        Templates Component
      </h4>
  
    <h5>Basic</h5>
    <p-multiSelect [options]="cities" 
                   [(ngModel)]="selectedCities1" 
                   defaultLabel="Select a City" 
                   optionLabel="name">
        <ng-template pTemplate="header">
            Header Content
        </ng-template>
    </p-multiSelect>
</div>

app.component.ts:

import { Component } from "@angular/core";
import {
    trigger,
    state,
    style,
    transition,
    animate
} from "@angular/animations";
import { SelectItem, PrimeNGConfig } from "primeng/api";
import { CountryService } from "./countryservice";
  
@Component({
    selector: "app-root",
    templateUrl: "./app.component.html",
    styleUrls: ["./app.component.scss"],
    providers: [CountryService]
})
export class AppComponent {
    selectedCities: string[] = [];
    selectedCountries1: string[] = [];
    selectedCountries2: string[] = [];
    items: SelectItem[];
    item: string;
    cities: any[];
    countries: any[];
  
    constructor(
        private countryService: CountryService,
        private primengConfig: PrimeNGConfig
    ) {
        this.items = [];
        this.countryService.getCountries().then(countries => {
            this.items = countries;
        });
  
        this.cities = [
            { name: "Nallasopara", code: "Nallasopara" },
            { name: "Naigaon", code: "Naigaon" },
            { name: "Mira road", code: "MR" },
            { name: "Vasai", code: "VASAI" },
            { name: "Virar", code: "virar" }
        ];
    }
  
    ngOnInit() {
        this.primengConfig.ripple = true;
    }
}

app.module.ts:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
import { BrowserAnimationsModule } 
    from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { MultiSelectModule } from 'primeng/multiselect';
  
@NgModule({
    imports: [
        BrowserModule,
        BrowserAnimationsModule,
        MultiSelectModule,
        FormsModule,
        HttpClientModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

输出:

Angular PrimeNG Form MultiSelect Templates Component

例子2：这是另一个例子，演示了Angular PrimeNG中Form MultiSelect Templates Component的用法。

app.component.html

<div style="text-align:center">
    <h1 style="color:green;">GeeksforGeeks</h1>
    <h3>A computer science portal for geeks</h3>
    <h4>
        Angular PrimeNG Form MultiSelect
        Templates Component
    </h4>
  
    <h5>Basic</h5>
    <p-multiSelect [options]="cities" 
                   [(ngModel)]="selectedCities1" 
                   defaultLabel="Select a City" 
                   optionLabel="name">
        <ng-template pTemplate="footer"> 
            footer Content 
        </ng-template>
    </p-multiSelect>
</div>

app.component.ts:

import { Component } from "@angular/core";
import {
    trigger,
    state,
    style,
    transition,
    animate
} from "@angular/animations";
import { SelectItem, PrimeNGConfig } from "primeng/api";
import { CountryService } from "./countryservice";
  
@Component({
    selector: "app-root",
    templateUrl: "./app.component.html",
    styleUrls: ["./app.component.scss"],
    providers: [CountryService]
})
export class AppComponent {
    selectedCities: string[] = [];
    selectedCountries1: string[] = [];
    selectedCountries2: string[] = [];
    items: SelectItem[];
    item: string;
    cities: any[];
    countries: any[];
  
    constructor(
        private countryService: CountryService,
        private primengConfig: PrimeNGConfig
    ) {
        this.items = [];
        this.countryService.getCountries().then(countries => {
            this.items = countries;
        });
  
        this.cities = [
            { name: "Nallasopara", code: "Nallasopara" },
            { name: "Naigaon", code: "Naigaon" },
            { name: "Mira road", code: "MR" },
            { name: "Vasai", code: "VASAI" },
            { name: "Virar", code: "virar" }
        ];
    }
  
    ngOnInit() {
        this.primengConfig.ripple = true;
    }
}

app.module.ts:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
import { BrowserAnimationsModule } 
    from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { MultiSelectModule } from 'primeng/multiselect';
  
@NgModule({
    imports: [
        BrowserModule,
        BrowserAnimationsModule,
        MultiSelectModule,
        FormsModule,
        HttpClientModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

输出:

Angular PrimeNG Form MultiSelect Templates Component