问题描述

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

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

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.

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() {
  }

}

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

      }
    });
   }
   ...
}

Ok in your grid component use @Input as resultGridList parameter

export class SearchGridListComponent implements OnInit {

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

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

App template html:

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

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

And in App ts file:

data = [];
...

handleResults(searchObj) {
  this.data = searchObj
}

这篇关于以角度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编程学习网！