src/wizard.component.ts
import { Component, Output, EventEmitter, ContentChildren, QueryList, AfterContentInit } from '@angular/core';
import { WizardStepComponent } from './wizard-step.component';
@Component({
selector: 'form-wizard',
template:
`<div class="card">
<div class="card-header">
<ul class="nav nav-justified">
<li class="nav-item" *ngFor="let step of steps" [ngClass]="{'active': step.isActive, 'enabled': !step.isDisabled, 'disabled': step.isDisabled, 'completed': isCompleted}">
<a (click)="goToStep(step)">{{step.title}}</a>
</li>
</ul>
</div>
<div class="card-block">
<ng-content></ng-content>
</div>
<div class="card-footer" [hidden]="isCompleted">
<button type="button" class="btn btn-secondary float-left" (click)="previous()" [hidden]="!hasPrevStep || !activeStep.showPrev">Previous</button>
<button type="button" class="btn btn-secondary float-right" (click)="next()" [disabled]="!activeStep.isValid" [hidden]="!hasNextStep || !activeStep.showNext">Next</button>
<button type="button" class="btn btn-secondary float-right" (click)="complete()" [disabled]="!activeStep.isValid" [hidden]="hasNextStep">Done</button>
</div>
</div>`
,
styles: [
'.card { height: 100%; }',
'.card-header { background-color: #fff; padding: 0; font-size: 1.25rem; }',
'.card-block { overflow-y: auto; }',
'.card-footer { background-color: #fff; border-top: 0 none; }',
'.nav-item { padding: 1rem 0rem; border-bottom: 0.5rem solid #ccc; }',
'.active { font-weight: bold; color: black; border-bottom-color: #1976D2 !important; }',
'.enabled { cursor: pointer; border-bottom-color: rgb(88, 162, 234); }',
'.disabled { color: #ccc; }',
'.completed { cursor: default; }'
]
})
export class WizardComponent implements AfterContentInit {
@ContentChildren(WizardStepComponent)
wizardSteps: QueryList<WizardStepComponent>;
private _steps: Array<WizardStepComponent> = [];
private _isCompleted: boolean = false;
@Output()
onStepChanged: EventEmitter<WizardStepComponent> = new EventEmitter<WizardStepComponent>();
constructor() { }
ngAfterContentInit() {
this.wizardSteps.forEach(step => this._steps.push(step));
this.steps[0].isActive = true;
}
get steps(): Array<WizardStepComponent> {
return this._steps.filter(step => !step.hidden);
}
get isCompleted(): boolean {
return this._isCompleted;
}
get activeStep(): WizardStepComponent {
return this.steps.find(step => step.isActive);
}
set activeStep(step: WizardStepComponent) {
if (step !== this.activeStep && !step.isDisabled) {
this.activeStep.isActive = false;
step.isActive = true;
this.onStepChanged.emit(step);
}
}
public get activeStepIndex(): number {
return this.steps.indexOf(this.activeStep);
}
get hasNextStep(): boolean {
return this.activeStepIndex < this.steps.length - 1;
}
get hasPrevStep(): boolean {
return this.activeStepIndex > 0;
}
public goToStep(step: WizardStepComponent): void {
if (!this.isCompleted) {
this.activeStep = step;
}
}
public next(): void {
if (this.hasNextStep) {
let nextStep: WizardStepComponent = this.steps[this.activeStepIndex + 1];
this.activeStep.onNext.emit();
nextStep.isDisabled = false;
this.activeStep = nextStep;
}
}
public previous(): void {
if (this.hasPrevStep) {
let prevStep: WizardStepComponent = this.steps[this.activeStepIndex - 1];
this.activeStep.onPrev.emit();
prevStep.isDisabled = false;
this.activeStep = prevStep;
}
}
public complete(): void {
this.activeStep.onComplete.emit();
this._isCompleted = true;
}
}