Javascript Firebase以选择的形式显示数据-角度

我试图以选择的形式显示数据，从表英雄和“nombre” 这是客户端的名称

在我的第二个表中，我想在向中添加产品时显示它们 将客户归于他们

有人能帮我吗？我是新来的：）

heromes.component.ts

import { Component, OnInit } from '@angular/core';
import { HeroesService } from '../../services/heroes.service';
import { HeroeModel } from '../../models/heroe.model';
import {AngularFireDatabase } from 'angularfire2/database';

import Swal from 'sweetalert2';

@Component({
  selector: 'app-heroes',
  templateUrl: './heroes.component.html',
  styleUrls: ['./heroes.component.css']
})
export class HeroesComponent implements OnInit {
  heroes: HeroeModel[] = [];
  cargando = false;

  constructor(private heroesService: HeroesService) {}

  ngOnInit() {
    this.cargando = true;
    this.heroesService.getHeroes().subscribe(resp => {
      this.heroes = resp;
      this.cargando = false;
    });
  }

  borrarHeroe(heroe: HeroeModel, index: number) {
    Swal.fire({
      title: 'Uwaga!',
      text: `Czy chcesz trwale usunąć kontrahenta ${heroe.nombre}?`,
      type: 'warning',
      showConfirmButton: true,
      showCancelButton: true
    }).then(resp => {
      if (resp.value) {
        this.heroesService.deleteHeroe(heroe.id).subscribe(resp => {
          this.heroes.splice(index, 1);
        });
      }
    });
  }
}

import { Component, OnInit } from '@angular/core';
import { NgForm } from '@angular/forms';
import Swal from 'sweetalert2';
import { Observable } from 'rxjs';
import { ActivatedRoute } from '@angular/router';
import { ADDProductsModel } from 'src/app/models/add-products.model';
import { ProductsService } from 'src/app/services/products.service';
import { HeroesComponent } from 'src/app/pages/heroes/heroes.component';
import { HeroeComponent } from 'src/app/pages/heroe/heroe.component';

@Component({
  selector: 'app-add-products',
  templateUrl: './add-products.component.html',
  styleUrls: ['./add-products.component.css']
})
export class ADDProductsComponent implements OnInit {

  ADDProducts: ADDProductsModel = new ADDProductsModel();

  constructor(
    private ProductsService: ProductsService,
    private route: ActivatedRoute
  ) {}

  ngOnInit() {
    const id = this.route.snapshot.paramMap.get('id');

    if (id !== 'new') {
      this.ProductsService.getADDProducts(id).subscribe((resp: ADDProductsModel) => {
        this.ADDProducts = resp;
        this.ADDProducts.id = id;
      });
    }
  }

  guardar(form: NgForm) {
    if (form.invalid) {
      console.log('Nieprawidłowy format');
      return;
    }

    Swal.fire({
      title: 'Ładowanie',
      text: 'Trwa zapis...',
      type: 'info',
      allowOutsideClick: false
    });

    Swal.showLoading();

    let peticion: Observable<any>;

    if (this.ADDProducts.id) {
      peticion = this.ProductsService.actualizarADDProducts(this.ADDProducts);
    } else {
      peticion = this.ProductsService.crearADDProducts(this.ADDProducts);
    }

    peticion.subscribe(resp => {
      Swal.fire({
        title: this.ADDProducts.number,
        text: 'Dodano pomyślnie',
        type: 'success'
      });
    });
    console.log(form);
    console.log(this.ADDProducts);
  }
}

add-products.component.ts

import { Component, OnInit } from '@angular/core';
import { HeroesService } from '../../services/heroes.service';
import { HeroeModel } from '../../models/heroe.model';
import {AngularFireDatabase } from 'angularfire2/database';

import Swal from 'sweetalert2';

@Component({
  selector: 'app-heroes',
  templateUrl: './heroes.component.html',
  styleUrls: ['./heroes.component.css']
})
export class HeroesComponent implements OnInit {
  heroes: HeroeModel[] = [];
  cargando = false;

  constructor(private heroesService: HeroesService) {}

  ngOnInit() {
    this.cargando = true;
    this.heroesService.getHeroes().subscribe(resp => {
      this.heroes = resp;
      this.cargando = false;
    });
  }

  borrarHeroe(heroe: HeroeModel, index: number) {
    Swal.fire({
      title: 'Uwaga!',
      text: `Czy chcesz trwale usunąć kontrahenta ${heroe.nombre}?`,
      type: 'warning',
      showConfirmButton: true,
      showCancelButton: true
    }).then(resp => {
      if (resp.value) {
        this.heroesService.deleteHeroe(heroe.id).subscribe(resp => {
          this.heroes.splice(index, 1);
        });
      }
    });
  }
}

import { Component, OnInit } from '@angular/core';
import { NgForm } from '@angular/forms';
import Swal from 'sweetalert2';
import { Observable } from 'rxjs';
import { ActivatedRoute } from '@angular/router';
import { ADDProductsModel } from 'src/app/models/add-products.model';
import { ProductsService } from 'src/app/services/products.service';
import { HeroesComponent } from 'src/app/pages/heroes/heroes.component';
import { HeroeComponent } from 'src/app/pages/heroe/heroe.component';

@Component({
  selector: 'app-add-products',
  templateUrl: './add-products.component.html',
  styleUrls: ['./add-products.component.css']
})
export class ADDProductsComponent implements OnInit {

  ADDProducts: ADDProductsModel = new ADDProductsModel();

  constructor(
    private ProductsService: ProductsService,
    private route: ActivatedRoute
  ) {}

  ngOnInit() {
    const id = this.route.snapshot.paramMap.get('id');

    if (id !== 'new') {
      this.ProductsService.getADDProducts(id).subscribe((resp: ADDProductsModel) => {
        this.ADDProducts = resp;
        this.ADDProducts.id = id;
      });
    }
  }

  guardar(form: NgForm) {
    if (form.invalid) {
      console.log('Nieprawidłowy format');
      return;
    }

    Swal.fire({
      title: 'Ładowanie',
      text: 'Trwa zapis...',
      type: 'info',
      allowOutsideClick: false
    });

    Swal.showLoading();

    let peticion: Observable<any>;

    if (this.ADDProducts.id) {
      peticion = this.ProductsService.actualizarADDProducts(this.ADDProducts);
    } else {
      peticion = this.ProductsService.crearADDProducts(this.ADDProducts);
    }

    peticion.subscribe(resp => {
      Swal.fire({
        title: this.ADDProducts.number,
        text: 'Dodano pomyślnie',
        type: 'success'
      });
    });
    console.log(form);
    console.log(this.ADDProducts);
  }
}

从'@angular/core'导入{Component，OnInit}；
从'@angular/forms'导入{NgForm}；
从“sweetalert2”进口棉签；
从“rxjs”导入{Observable}；
从'@angular/router'导入{ActivatedRoute}；
从'src/app/models/add products.model'导入{ADDProductsModel}；
从'src/app/services/products.service'导入{ProductsService}；
从'src/app/pages/heromes/heromes.component'导入{HeroesComponent}；
从'src/app/pages/heroe/heroe.component'导入{heroComponent}；
@组成部分({
选择器：“应用程序添加产品”，
templateUrl:“./add products.component.html”，
样式URL:['./添加产品.component.css']
})
导出类ADDProductsComponent实现OnInit{
ADDProducts:ADDProductsModel=新的ADDProductsModel（）；
建造师(
私人产品服务：产品服务，
专用路由：ActivatedRoute
) {}
恩戈尼尼特（）{
const id=this.route.snapshot.paramMap.get（'id'）；
如果（id！=“新建”）{
this.ProductsService.getADDProducts（id）.subscribe（（resp:ADDProductsModel）=>{
this.ADDProducts=resp；
this.ADDProducts.id=id；
});
}
}
瓜达尔（表格：NgForm）{
如果（格式无效）{
log（'Nieprawidłowy格式'）；
返回；
}
喷火({
标题：“Ładowanie”，
文字：“Trwa zapis…”，
键入：“info”，
allowOutsideClick:false
});
Swal.showLoading（）；
让佩蒂西奥：可观察；
if（this.ADDProducts.id）{
peticion=this.ProductsService.RealizarAddProducts（this.ADDProducts）；
}否则{
peticion=this.ProductsService.crearADDProducts（this.ADDProducts）；
}
订阅（resp=>{
喷火({
标题：this.ADDProducts.number，
文字：“Dodano pomyślnie”，
类型：“成功”
});
});
控制台日志（表格）；
console.log（this.ADDProducts）；
}
}

<强>第一，<强>考虑组件交互中的父-子模型。为了方便起见，我不打算在这里包括任何firebase部件。我假设您使用firebase数据的工作非常好

现在，您的问题是如何将数据从子级发送回父级，所以这里是您的解决方案

完整的解决方案可在

• app.component.html

   <div>
        <span > Name comes form child in Parent Component </span>
        <select>
            <option> Select Name </option>    
            <option *ngFor="let item of nameFromChild"> {{item}} </option>
        </select>
   </div>
  

   <input type ="text" [(ngModel)]="name"> <br><br>
   <button (click)="sendNameToParent(name)"> Add Name to Parent </button>
  

• child.component.html

   <div>
        <span > Name comes form child in Parent Component </span>
        <select>
            <option> Select Name </option>    
            <option *ngFor="let item of nameFromChild"> {{item}} </option>
        </select>
   </div>
  

   <input type ="text" [(ngModel)]="name"> <br><br>
   <button (click)="sendNameToParent(name)"> Add Name to Parent </button>
  

  
  
  
  将名称添加到父级
  

• 子组件.ts

   export class AppComponent  {
          nameFromChild: string[] = []; // your property.
          /*
              nameFromChildFun() is called when there is data emitted from child-component. 
              @parms ='nameFromChild' : gets parameter from child using $event from app.component.html.
          */
          nameFromChildFun(nameFromChild){
                 this.nameFromChild.push(nameFromChild); //name pushes to property. and displaying in select tag using *ngFor. 
          }
   }
  

   import { Component, EventEmitter, Output } from '@angular/core';
  
   export class ChildComponent implements OnInit {
          @Output() nameFromChild = new EventEmitter();
          // nameFromChild is passed in app.component.html in <app-child (nameFromChild)="nameFromChildFun($event)
  
          sendNameToParent(name){
               this.nameFromChild.emit(name); // emitting value to parent.
          }
   }
  

  从'@angular/core'导入{Component，EventEmitter，Output}；
  导出类ChildComponent实现OnInit{
  @Output（）nameFromChild=neweventemitter（）；
  //nameFromChild在app.component.html中传递，有什么问题？我不知道如何下载数据以将表单填充到另一个组件：（我已经尝试处理这个问题好几个小时了。您可以使用
  @input
  和
  @output
  指令进行组件交互。您可以使用
  @input
  将数据发送到子组件，从子组件发送到父组件，您可以使用
  @output
  发送事件emmiter。或者，您也可以使用rxJS Subject..在您的情况下，yo你可以考虑你的两个组件HelOS并添加与这个方法的项目交互。@ Gurangddorda将与FixBasy一起工作吗？是的，首先你需要从FielBasic获取所有数据，然后将数据传递给组件属性，并且该数据再次被用作子组件的输入数据，<代码> < /代码>这是你的子组件。这样的数据..
  @input（'childData'）childPropData；
  然后您可以使用html格式的数据，如
  {{childPropData.fieldName}
  问题是，在执行代码后，没有任何内容显示在下拉列表中：（我现在不知道我做错了什么……你试过什么？你检查过stackblitz吗？是的，在实现代码后，组件中没有显示任何数据。