Angular 2新手在这里,我正在尝试制作处理重置,保存功能等基本活动的主表单。主表单使用ng-content
加载其内容区域。
单击save
按钮,我希望Master Form在执行其自己的指令集之前调用子组件save()
函数。
我该怎么做?
我认为这个问题与我想要的有些相似,但是那里给出的解决方案没有用 Angular 2 call function of component that was inserted with transclusion (ng-content)
以下是我的代码,请求您提供帮助
form.component.ts
import { Component, Input, Output, ContentChild } from '@angular/core';
@Component({
selector: 'app-form',
templateUrl: './form.component.html',
styleUrls: ['./form.component.css']
})
export class FormComponent{
@Input() headerTitle:string = "Header Title";
@Input() saveBtnText: string = "Save";
@Input() resetBtnText: string = "Reset";
@Input() addBtnText: string = "Add";
@ContentChild('transcludedContent') contentChild;
saveForm(){
console.log("Parent Form save");
console.log(this.contentChild.saveForm1());
}
}
test1.component.html
<app-form headerTitle="my header" #transcludedContent>
<div form-body>
<p>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes,
</p>
</div>
</app-form>
test1.component.ts
import { Component, OnInit } from '@angular/core';
import { FormComponent } from '../form/form.component';
@Component({
selector: 'app-test1',
templateUrl: './test1.component.html',
styleUrls: ['./test1.component.css']
})
export class Test1Component extends FormComponent {
saveForm1(){
console.log("Child Form save");
}
}
我无法在test1.componen
中引用form.component
t,以便我可以调用其save()
函数。什么是实现这一目标的正确方法?
修改1:
同时添加 form.component.html 以供将来参考
<div class="panel panel-default fcs-form">
<div class="panel-header form-header">
{{headerTitle}}
</div>
<div class="panel-body form-body">
<ng-content select="[form-body]"></ng-content>
</div>
<div class="panel-footer text-center form-footer">
<button class="btn btn-primary">{{resetBtnText}}</button>
<button class="btn btn-primary">{{saveBtnText}}</button>
<button class="btn btn-primary">{{addBtnText}}</button>
</div>
</div>
答案 0 :(得分:2)
我认为这就是你想要的 - 使用输出事件从子节点传送到父节点:
@Component({
selector: 'app-form',
templateUrl: './form.component.html',
styleUrls: ['./form.component.css']
})
export class FormComponent{
@Input() headerTitle:string = "Header Title";
@Input() saveBtnText: string = "Save";
@Input() resetBtnText: string = "Reset";
@Input() addBtnText: string = "Add";
@Output() save:EventEmitter = new EventEmitter();
saveForm(){
console.log("Parent Form save");
this.save.emit(null);
}
}
<app-form headerTitle="my header" (save)="saveForm()">
<div form-body>
<p>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes,
</p>
</div>
</app-form>
答案 1 :(得分:1)
如果你想保持ContentChild
方法,那么这应该有效。但我建议使用@Input
和@Output
方法,例如Günter Zöchbauers回答。
@ContentChild('transcludedContent') contentChild: any;
saveForm(){
if(typeof this.child.save === 'function') { //make sure that the save method exists
this.child.save();
}
}
我还为您更新了plunker ,以展示这个概念 https://plnkr.co/edit/0T0BBEJm73NWxUtW9Oje?p=preview