极客教程Angular PrimeNG TreeTable变化检测
Angular PrimeNG是一个开源的框架，有丰富的原生Angular UI组件，用来做很好的造型，这个框架用来做响应式的网站非常容易。它提供了大量的模板、组件、主题设计、广泛的图标库等等。
在这篇文章中，我们将学习Angular PrimeNG TreeTable Change Detection。TreeTable是用来以表格形式显示分层数据的。TreeTable需要意识到其数值的变化。由于性能问题，推送、弹出或其他动作在这种情况下不起作用。因此，我们需要使用spread operator或类似的方式来拼接创建一个新的数组引用。
语法:
// Modify the data
// Next splice and reference the new data array
this.data = [...this.data];
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 geeks_angular
第2步：在创建你的项目文件夹即geeks_angular之后，使用以下命令移动到它。
cd geeks_angular
步骤3：在你给定的目录中安装PrimeNG。
npm install primeng --save
npm install primeicons --save
项目结构：项目结构将如下所示。
Project Structure
例子1：在下面的例子中，我们用一个按钮修改了数据，把数据推到数组中。后来使用另一个按钮，TreeTable被更新。
<h1 style="color: green; text-align:center;">
GeeksforGeeks
</h1>
<h3>Angular PrimeNG TreeTable Change Detection</h3>
<p-treeTable [columns]="cols" [value]="tableData">
<ng-template pTemplate="header">
<tr>
<th>Name</th>
<th>Age</th>
</tr>
</ng-template>
<ng-template pTemplate="body"
let-rowNode let-rowData="rowData"
let-columns="columns">
<tr>
<td>
<p-treeTableToggler
[rowNode]="rowNode">
</p-treeTableToggler>
{{ rowData.name }}
</td>
<td>{{ rowData.age }}</td>
<td>{{ rowData.type }}</td>
</tr>
</ng-template>
</p-treeTable>
<p-button label="Add Data"
(onClick)="handleClick()"></p-button>
<p-button label="Update TreeTable"
(onClick)="updateView()"></p-button>
import { Component, OnInit, ViewChild } from '@angular/core';
import { NodeService } from './nodeservice';
import { TreeNode } from 'primeng/api';
import { TreeTable } from 'primeng/treetable';
import { MessageService } from 'primeng/api';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
providers: [MessageService],
})
export class AppComponent {
tableData: TreeNode[];
cols: any[];
constructor(private messageService: MessageService) { }
ngOnInit() {
this.cols = [
{ field: 'name', header: 'First Name' },
{ field: 'age', header: 'Age' },
];
this.tableData = [
{
data: {
name: 'A',
age: '40',
},
children: [
{
data: {
name: 'B',
age: '16',
},
},
{
data: {
name: 'C',
age: '14',
},
},
],
},
{
data: {
name: 'G',
age: '32',
},
children: [
{
data: {
name: 'H',
age: '20',
},
},
{
data: {
name: 'I',
age: '24',
},
},
],
},
{
data: {
name: 'M',
age: '12',
},
children: [
{
data: {
name: 'N',
age: '20',
},
},
{
data: {
name: 'O',
age: '24',
},
},
],
},
{
data: {
name: 'S',
age: '43',
},
children: [
{
data: {
name: 'T',
age: '20',
},
},
{
data: {
name: 'U',
age: '24',
},
},
],
},
];
}
handleClick() {
this.tableData.push({
data: {
name: 'S',
age: '43',
},
children: [
{
data: {
name: 'T',
age: '20',
},
},
{
data: {
name: 'U',
age: '24',
},
},
],
});
}
updateView() {
this.tableData = [...this.tableData];
}
}
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 { NodeService } from './nodeservice';
import { TreeTableModule } from 'primeng/treetable';
import { ButtonModule } from 'primeng/button';
import { InputTextModule } from 'primeng/inputtext';
import { ToastModule } from 'primeng/toast';
import { RippleModule } from 'primeng/ripple';
@NgModule({
imports: [
BrowserModule,
BrowserAnimationsModule,
TreeTableModule,
ButtonModule,
InputTextModule,
HttpClientModule,
FormsModule,
ToastModule,
RippleModule,
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [NodeService],
})
export class AppModule { }
输出:
例子2：在下面的例子中，我们用新数据修改了表数据。
<h1 style="color: green; text-align:center;">
GeeksforGeeks
</h1>
<h3>Angular PrimeNG TreeTable Change Detection</h3>
<p-treeTable [columns]="cols" [value]="tableData">
<ng-template pTemplate="header">
<tr>
<th>Name</th>
<th>Age</th>
</tr>
</ng-template>
<ng-template pTemplate="body"
let-rowNode let-rowData="rowData"
let-columns="columns">
<tr>
<td>
<p-treeTableToggler
[rowNode]="rowNode">
</p-treeTableToggler>
{{ rowData.name }}
</td>
<td>{{ rowData.age }}</td>
<td>{{ rowData.type }}</td>
</tr>
</ng-template>
</p-treeTable>
<p-button label="Update Data"
(onClick)="handleClick()"></p-button>
import { Component, OnInit, ViewChild } from '@angular/core';
import { NodeService } from './nodeservice';
import { TreeNode } from 'primeng/api';
import { TreeTable } from 'primeng/treetable';
import { MessageService } from 'primeng/api';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
providers: [MessageService],
})
export class AppComponent {
tableData: TreeNode[];
cols: any[];
constructor(private messageService: MessageService) { }
ngOnInit() {
this.cols = [
{ field: 'name', header: 'First Name' },
{ field: 'age', header: 'Age' },
];
this.tableData = [
{
data: {
name: 'A',
age: '40',
},
children: [
{
data: {
name: 'B',
age: '16',
},
},
{
data: {
name: 'C',
age: '14',
},
},
],
},
{
data: {
name: 'G',
age: '32',
},
children: [
{
data: {
name: 'H',
age: '20',
},
},
{
data: {
name: 'I',
age: '24',
},
},
],
},
{
data: {
name: 'M',
age: '12',
},
children: [
{
data: {
name: 'N',
age: '20',
},
},
{
data: {
name: 'O',
age: '24',
},
},
],
},
{
data: {
name: 'S',
age: '43',
},
children: [
{
data: {
name: 'T',
age: '20',
},
},
{
data: {
name: 'U',
age: '24',
},
},
],
},
];
}
handleClick() {
this.tableData = [
{
data: {
name: 'D',
age: '55',
},
children: [
{
data: {
name: 'E',
age: '20',
},
},
{
data: {
name: 'F',
age: '24',
},
},
],
},
{
data: {
name: 'J',
age: '64',
},
children: [
{
data: {
name: 'K',
age: '20',
},
},
{
data: {
name: 'L',
age: '24',
},
},
],
},
{
data: {
name: 'P',
age: '34',
},
children: [
{
data: {
name: 'Q',
age: '20',
},
},
{
data: {
name: 'R',
age: '24',
},
},
],
},
];
}
}
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 { NodeService } from './nodeservice';
import { TreeTableModule } from 'primeng/treetable';
import { ButtonModule } from 'primeng/button';
import { InputTextModule } from 'primeng/inputtext';
import { ToastModule } from 'primeng/toast';
import { RippleModule } from 'primeng/ripple';
@NgModule({
imports: [
BrowserModule,
BrowserAnimationsModule,
TreeTableModule,
ButtonModule,
InputTextModule,
HttpClientModule,
FormsModule,
ToastModule,
RippleModule,
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [NodeService],
})
export class AppModule { }
输出:
