我可以以编程方式在Angular / Angular材质中移动水平垫脚垫的步骤吗

Question 1

我对Angular Material（使用Angular 4+）有疑问。说在组件模板中，我添加了一个<mat-horizontal-stepper>组件，并且在每个步骤中，<mat-step>我都有步进按钮来导航该组件。像这样

<mat-horizontal-stepper>
  <mat-step>
    Step 1
    <button mat-button matStepperPrevious type="button">Back</button>
    <button mat-button matStepperNext type="button">Next</button>
  </mat-step>
  <mat-step>
    Step 2
    <button mat-button matStepperPrevious type="button">Back</button>
    <button mat-button matStepperNext type="button">Next</button>
  </mat-step>
  <mat-step>
    Step 3
    <button mat-button matStepperPrevious type="button">Back</button>
    <button mat-button matStepperNext type="button">Next</button>
  </mat-step>
</mat-horizontal-stepper>

现在，我想知道是否可以删除每个步骤中的按钮，并将它们放置<mat-horizontal-stepper>在静态位置或什至外部的其他位置，<mat-horizontal-stepper>并且可以使用组件打字稿文件中的代码来回导航。给一个想法，我希望我的HTML是这样的

<mat-horizontal-stepper>
    <mat-step>
        Step 1
    </mat-step>
    <mat-step>
        Step 2
    </mat-step>
    <mat-step>
        Step 3
    </mat-step>
    <!-- one option -->
    <div>
       <button mat-button matStepperPrevious type="button">Back</button>
       <button mat-button matStepperNext type="button">Next</button>
    </div>
</mat-horizontal-stepper>

<!-- second option -->
<div>
   <button (click)="goBack()" type="button">Back</button>
   <button (click)="goForward()" type="button">Next</button>
</div>

Question 2

是。通过使用的selectedIndex属性，可以跳到特定的步进器MatStepper。此外，还 MatStepper公开了公共方法next()和previous()。您可以使用它们来回移动。

在您的模板中：

为您的步进器添加ID，例如#stepper。然后在goBack()和goForward()方法中，传递stepper id：

<mat-horizontal-stepper #stepper>
    <!-- Steps -->
</mat-horizontal-stepper>    
<!-- second option -->
<div>
   <button (click)="goBack(stepper)" type="button">Back</button>
   <button (click)="goForward(stepper)" type="button">Next</button>
</div>

..并在您的打字稿中：

import { MatStepper } from '@angular/material/stepper';

goBack(stepper: MatStepper){
    stepper.previous();
}

goForward(stepper: MatStepper){
    stepper.next();
}

链接到stackblitz演示。

您还可以使用ViewChildTypeScript中对stepper组件的引用，如下所示：

@ViewChild('stepper') private myStepper: MatStepper;

goBack(){
    this.myStepper.previous();
}

goForward(){
    this.myStepper.next();
}

在这种情况下，您不必在组件html的方法中传递步进器引用。使用ViewChild链接到演示

您可以使用以下方法启用/禁用Back和Next按钮：

<button (click)="goBack(stepper)" type="button" 
        [disabled]="stepper.selectedIndex === 0">Back</button>
<button (click)="goForward(stepper)" type="button" 
        [disabled]="stepper.selectedIndex === stepper._steps.length-1">Next</button>

Question 3

除了@ Faisal的答案之外，这是我使MatStepper跳转而无需在参数中传递步进器的观点。

当您需要更大的灵活性来操作步进器（例如从Service或其他东西）时，这将很有帮助。

HTML：

<div fxLayout="row" fxLayoutAlign="center center" fxLayoutGap="6px">
  <button (click)="move(0)">1st</button>
  <button (click)="move(1)">2nd</button>
  <button (click)="move(2)">3rd</button>
  <button (click)="move(3)">4th</button>
</div>

TS档案：

move(index: number) {
    this.stepper.selectedIndex = index;
}

这是stackblitz演示。

Question 4

如果要以编程方式导航到下一步，并且使用的是线性步进器，请执行以下步骤：

创建一个stepper像这样的： <mat-horizontal-stepper linear #matHorizontalStepper>
定义mat-step如下：<mat-step [completed]="isThisStepDone">
从内部mat-step创建一个按钮，转到下一步，如下所示： <button (click)="next(matHorizontalStepper)">NEXT STEP</button>
在.ts文件中声明一个MatStepper名为stepper的引用：
@ViewChild('matHorizontalStepper') stepper: MatStepper;
另外，在.ts文件内初始化isThisStepDone为false：isThisStepDone: boolean = false;

然后为名为“ NEXT STEP”的按钮编写方法next()：

submit(stepper: MatStepper) {
 this.isThisStepDone = true;
 setTimeout(() => {           // or do some API calls/ Async events
  stepper.next();
 }, 1);
}

Question 5

您也可以通过使用selectedIndex指定步进器的实际索引来做到这一点。

stackblitz：https ://stackblitz.com/edit/angular-4rvy2s ? file = app%2Fstepper-overview-example.ts

HTML：

<div class="fab-nav-container">
   <mat-vertical-stepper linear="false" #stepper>
       <mat-step *ngFor="let step of stepNodes; let i = index">
           <ng-template matStepLabel>
               <p> {{step.title}} </p>
           </ng-template>
       </mat-step>
   </mat-vertical-stepper>
</div>

<div class="button-container">
   <div class="button-grp">
      <button mat-stroked-button (click)="clickButton(1, stepper)">1</button>
      <button mat-stroked-button (click)="clickButton(2, stepper)">2</button>
      <button mat-stroked-button (click)="clickButton(3, stepper)">3</button>
   </div>
</div>

TS：

import {Component, OnInit, ViewChild} from '@angular/core';
import {FormBuilder, FormGroup, Validators} from '@angular/forms';
import { MatVerticalStepper } from '@angular/material';
import { MatStepper } from '@angular/material';
export interface INodes {
    title: string;
    seq: number;
    flowId: string;
}
/**
 * @title Stepper overview
 */
@Component({
  selector: 'stepper-overview-example',
  templateUrl: 'stepper-overview-example.html',
  styleUrls: ['stepper-overview-example.scss'],
})
export class StepperOverviewExample implements OnInit {
  @ViewChild(MatVerticalStepper) vert_stepper: MatVerticalStepper;
  @ViewChild('stepper') private myStepper: MatStepper;

  stepNodes: INodes[] = [
    { title: 'Request Submission', seq: 1, flowId: 'xasd12'}, 
    { title: 'Department Approval', seq: 2, flowId: 'erda23'}, 
    { title: 'Requestor Confirmation', seq: 3, flowId: 'fsyq51'}, 
  ];

  ngOnInit() {
  }
  ngAfterViewInit() {
    this.vert_stepper._getIndicatorType = () => 'number';
  }
  clickButton(index: number, stepper: MatStepper) {
      stepper.selectedIndex = index - 1;
  }
}