将数据从一个组件传递到另一个组件 [英] Pass data from one component to another in angular

问题描述

我正在开发一个包含搜索功能的应用程序.

I am working on a application which contains a search functionality.

现在我有2个组件正在应用中 1.导航栏 2. SearchGridList

Right now I have 2 components in application 1. Navbar 2. SearchGridList

导航栏组件包含一个文本框，您可以在其中输入搜索查询并按Enter键，该组件将进行api调用并获取数据. 当数据返回时，我想将此数据填充到SearchGridList组件的数组中.

Navbar component contains a text box, in which you type in a search query and hit enter and this component will make a api call and get the data. When the data comes back, I want to populate this data in an array in SearchGridList component.

我很难理解在Angular中如何在组件内传递数据，有人可以看看我的代码并为我提供指导.

I am having a tough time understanding passing data within components in Angular, can someone please take a look at my code and guide me.

navbar.component.ts

import { Component, OnInit, Input, Output } from '@angular/core';
import {DataService} from '../../services/data.service';
import {SearchResults} from '../class/search.class';
import {SearchGridListComponent} from '../search-grid-list/search-grid-list.component';
import { EventEmitter } from '@angular/core';

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

  searchQuery : String;
  //searchResultList : Array<any> = [];

  constructor(private dataService :  DataService) { }

  doSearch () : any
  {
    this.dataService.doSQLSearch(this.searchQuery)
    .then ((data:any)=>{
      for (var i =0; i<data.Results.length;i++){
        let searchObj = new SearchResults(data.Results[i]);
        //I want to push data into array from SearchGrid like this 
        resultGridList.push(searchObj);

      }
    });
   }

  ngOnInit() {
  }
}

navbar.component.html

<mat-toolbar class="main-header">
  <a href="/">
  <img src="../../../assets/vms-header-logo.png" id= "header-logo">
  </a>
    <form class="search-box">
      <mat-form-field  class="search-box-full-width">
        <input id ="search-textbox" matInput placeholder="Enter a Barcode, DSID or any search term" name="Search" [(ngModel)]="searchQuery" (keyup.enter)="doSearch()" autocomplete="off">
      </mat-form-field>
    </form>
</mat-toolbar>

search-grid.component.ts

import { Component, OnInit, Input } from '@angular/core';
import {NavbarComponent} from '../navbar/navbar.component';

@Component({
  selector: 'app-search-grid-list',
  templateUrl: './search-grid-list.component.html',
  styleUrls: ['./search-grid-list.component.css'],
})
export class SearchGridListComponent implements OnInit {
  resultGridList : Array <any> = [];
  constructor() { }

  ngOnInit() {
  }

}

推荐答案

您需要在@Output事件之后添加到导航栏:

You need to add to navbar following @Output event:

export class NavbarComponent implements OnInit {
   ...
   @Output() public found = new EventEmitter<any>();
   ...
   doSearch () : any
   {
    this.dataService.doSQLSearch(this.searchQuery) .then ((data:any)=>{
      for (var i =0; i<data.Results.length;i++){
        let searchObj = new SearchResults(data.Results[i]);

        this.found.emit(searchObj);  // !!!! here emit event
                                     // however emitting events in loop looks strange... better is to emit one evet

      }
    });
   }
   ...
}

在网格组件中确定使用@Input作为resultGridList参数

Ok in your grid component use @Input as resultGridList parameter

export class SearchGridListComponent implements OnInit {

  @Input() public resultGridList : Array <any> = [];
  ...
}

好，现在在您的App组件中，可以通过以下方式将这两者结合在一起

Ok and now in your App component join this two in following way

应用模板html:

<app-navbar (found)="handleResults($event)"></app-navbar>

<app-search-grid-list [resultGridList]="data"></app-search-grid-list>

在App ts文件中:

And in App ts file:

data = [];
...

handleResults(searchObj) {
  this.data = searchObj
}

这篇关于将数据从一个组件传递到另一个组件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！