Angular PrimeNG Table Lazy

Angular PrimeNG Table Lazy

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,非常方便。本文将告诉我们如何在Angular PrimeNG中使用Table Lazy。

Angular PrimeNG Table Lazy是用来懒惰地加载Table组件的数据。它在需要的时候加载数据,使表更具有交互性和用户友好性。

语法:

// In app.component.html
<p-table
    [columns]="cols"
    [value]="tableData"
    [lazy]="true"
    (onLazyLoad)="loadNodes($event)"
    [loading]="loading">
</p-table>

// In app.component.ts 
loadNodes(event) {
    // lazy function
}
HTML

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
JavaScript

第2步:创建你的项目文件夹即appname后,使用以下命令移动到它。

cd appname
JavaScript

第3步在你给定的目录中安装PrimeNG。

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

项目结构:它将看起来像如下。

Angular PrimeNG Table Lazy

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

  • app.component.html
<h2 style="color: green">
    GeeksforGeeks
</h2>
<h4>Angular PrimeNG Table Lazy</h4>
  
<p-table [value]="tableData" 
         [lazy]="true" 
         (onLazyLoad)="loadNodes($event)" 
         [loading]="loading">
    <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>
HTML
  • app.component.ts
import { Component } from '@angular/core';
import { NodeService } from './nodeservice';
  
interface People {
    firstname?: string;
    lastname?: string;
    age?: string;
}
  
@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
})
export class AppComponent {
    tableData: People[] = [];
    cols: any[] = [];
    loading: boolean = false;
    constructor(private nodeService: NodeService) { }
  
    ngOnInit() {
        this.cols = [
            {
                field: 'firstname',
                header: 'First Name'
            },
            {
                field: 'lastname',
                header: 'Last Name'
            },
            {
                field: 'age',
                header: 'Age'
            },
        ];
        this.loading = true;
    }
    loadNodes(event: any) {
        this.loading = true;
        setTimeout(() => {
            this.loading = false;
            this.tableData = [
                {
                    firstname: 'David',
                    lastname: 'ace',
                    age: '40',
                },
                {
                    firstname: 'AJne',
                    lastname: 'west',
                    age: '40',
                },
                {
                    firstname: 'Mak',
                    lastname: 'Lame',
                    age: '40',
                },
                {
                    firstname: 'Peter',
                    lastname: 'raw',
                    age: '40',
                },
                {
                    firstname: 'Kane',
                    lastname: 'James',
                    age: '40',
                },
            ];
        }, 1000);
    }
}
JavaScript
  • app.module.ts
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],
    providers: [],
})
export class AppModule { }
JavaScript

输出:

Angular PrimeNG Table Lazy

实例2:下面是另一个演示Angular PrimeNG Table Lazy使用的例子。在这个例子中,我们懒惰地加载了5秒钟的数据。

  • app.component.html
<h2 style="color: green">
    GeeksforGeeks
</h2>
<h4>Angular PrimeNG Table Lazy</h4>
  
<p-table [value]="tableData" 
         [lazy]="true" 
         (onLazyLoad)="loadNodes($event)" 
         [loading]="loading">
    <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>
HTML
  • app.component.ts
import { Component, OnInit } 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[] = [];
    loading: boolean = false;
    constructor() { }
  
    ngOnInit() {
        this.cols = [
            {
                field: 'firstname',
                header: 'First Name'
            },
            {
                field: 'lastname',
                header: 'Last Name'
            },
            {
                field: 'age',
                header: 'Age'
            },
        ];
        this.loading = true;
    }
    loadNodes(event: any) {
        this.loading = true;
        setTimeout(() => {
            this.loading = false;
            this.tableData = [
                {
                    firstname: 'David',
                    lastname: 'ace',
                    age: '40',
                },
                {
                    firstname: 'AJne',
                    lastname: 'west',
                    age: '40',
                },
                {
                    firstname: 'Mak',
                    lastname: 'Lame',
                    age: '40',
                },
                {
                    firstname: 'Peter',
                    lastname: 'raw',
                    age: '40',
                },
                {
                    firstname: 'Kane',
                    lastname: 'James',
                    age: '40',
                },
            ];
        }, 5000);
    }
}
JavaScript
  • app.module.ts
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],
    providers: [],
})
export class AppModule { }
JavaScript

输出:

Angular PrimeNG Table Lazy

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