Angular PrimeNG Table VirtualScroll

Angular PrimeNG是一个开源框架，拥有丰富的原生Angular UI组件，可以用来做很好的造型，这个框架用来制作响应式网站非常方便。在这篇文章中，我们将看到如何在Angular PrimeNG中使用Table VirtualScroll。

Angular PrimeNG Table VirtualScroll是用来在Table组件中启用虚拟滚动。VirtualScroller是一种有效处理数据的方法。

语法:

<p-table 
    [virtualScroll]="true" 
    [virtualRowHeight]="..">
</p-table>

创建Angular应用程序和模块安装。

第1步：使用以下命令创建一个Angular应用程序。

ng new appname

第2步：在完成你的项目文件夹即appname后，使用以下命令移动到它。

cd appname

第3步在你给定的目录中安装PrimeNG。

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

项目结构：它将看起来像如下。

Angular PrimeNG Table VirtualScroll

Project Structure

例子1：下面是一个简单的例子，演示Angular PrimeNG Table VirtualScroll的使用。

<h2 style="color: green">GeeksforGeeks</h2>
<h4>Angular PrimeNG Table VirtualScroll</h4>
  
<p-table 
    [value]="tableData" 
    [scrollable]="true" 
    scrollHeight="400px" 
    [virtualScroll]="true" 
    [virtualRowHeight]="70">
      
    <ng-template pTemplate="header">
        <tr>
            <th>First Name</th>
            <th>Last Name</th>
            <th>Age</th>
        </tr>
    </ng-template>
  
    <ng-template pTemplate="body" let-people>
        <tr>
            <td>
                {{ people.firstname }}
            </td>
            <td>
                {{ people.lastname }}
            </td>
            <td>
                {{ people.age }}
            </td>
        </tr>
    </ng-template>
</p-table>

import { Component } from '@angular/core';
  
interface People {
    firstname?: string;
    lastname?: string;
    age?: string;
}
  
@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
})
export class AppComponent {
    tableData: People[] = [];
    cols: any[] = [];
  
    ngOnInit() {
        this.cols = [
            { field: 'firstname', header: 'First Name' },
            { field: 'lastname', header: 'Last Name' },
            { field: 'age', header: 'Age' },
        ];
        this.tableData = [
            {
                firstname: 'David',
                lastname: 'ace',
                age: '10',
            },
            {
                firstname: 'AJne',
                lastname: 'west',
                age: '11',
            },
            {
                firstname: 'Mak',
                lastname: 'Lame',
                age: '12',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '13',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '14',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '14',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '15',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '16',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '17',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '18',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '18',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '19',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '20',
            },
        ];
    }
}

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

输出:

Angular PrimeNG Table VirtualScroll

例子2：下面是另一个例子，演示Angular PrimeNG Table VirtualScroll的使用。在这个例子中，我们将virtualRowHeight增加到120。

<h2 style="color: green">GeeksforGeeks</h2>
<h4>Angular PrimeNG Table VirtualScroll</h4>
  
<p-table 
    [value]="tableData" 
    [scrollable]="true" 
    scrollHeight="400px" 
    [virtualScroll]="true" 
    [virtualRowHeight]="120">
      
    <ng-template pTemplate="header">
        <tr>
            <th>First Name</th>
            <th>Last Name</th>
            <th>Age</th>
        </tr>
    </ng-template>
  
    <ng-template pTemplate="body" let-people>
        <tr>
            <td>
                {{ people.firstname }}
            </td>
            <td>
                {{ people.lastname }}
            </td>
            <td>
                {{ people.age }}
            </td>
        </tr>
    </ng-template>
</p-table>

import { Component } from '@angular/core';
  
interface People {
    firstname?: string;
    lastname?: string;
    age?: string;
}
  
@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
})
export class AppComponent {
    tableData: People[] = [];
    cols: any[] = [];
      
    ngOnInit() {
        this.cols = [
            { field: 'firstname', header: 'First Name' },
            { field: 'lastname', header: 'Last Name' },
            { field: 'age', header: 'Age' },
        ];
        this.tableData = [
            {
                firstname: 'David',
                lastname: 'ace',
                age: '10',
            },
            {
                firstname: 'AJne',
                lastname: 'west',
                age: '11',
            },
            {
                firstname: 'Mak',
                lastname: 'Lame',
                age: '12',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '13',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '14',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '14',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '15',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '16',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '17',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '18',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '18',
            },
            {
                firstname: 'Peter',
                lastname: 'raw',
                age: '19',
            },
            {
                firstname: 'Kane',
                lastname: 'James',
                age: '20',
            },
        ];
    }
}

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