来自 API 的 Angular Material 自动完成 [英] Angular Material autocomplete From API

问题描述

我尝试从 api 使用自动完成，但它不起作用.它只有在没有 api 的情况下才能工作.

这是我的组件 TS:在里面，有一个带有来自 api (onGetTaxList) 的数据的回调方法

import { Component, OnInit } from '@angular/core';从'../../../../core/services/users.service'导入{用户服务}；从'@angular/forms'导入{FormControl}；从 'rxjs' 导入 { Observable };import { map, startWith } from 'rxjs/operators';@成分({选择器:'app-create-process-modal'，templateUrl: './create-process-modal.component.html',styleUrls: ['./create-process-modal.component.sass']})导出类 CreateProcessComponent 实现 OnInit {myControl = new FormControl();选项 = [{名称:'一个'}，{名称:'两个'}，{名称:'树'}，];FilteredOptions: Observable;构造函数(私有服务:UsersService){}ngOnInit() {this.service.createNewProcess((data) => this.onGetTaxList(data));this.filteredOptions = this.myControl.valueChanges.管道(从...开始('')，地图(值=> this._filter(值)));}onGetTaxList(数据){控制台日志(数据)；}私人_过滤器(值:字符串){const filterValue = value.toLowerCase();返回 this.options.filter(option => option.name.toLowerCase().includes(filterValue));}}

组件html:

<h2 style="text-align: right">新流程</h2><mat-form-field style="text-align: right"><input type="text" placeholder="开始打字..." matInput [formControl]="myControl" [matAutocomplete]="auto"><mat-autocomplete #auto="matAutocomplete"><mat-option *ngFor="let option of filteredOptions | async" [value]="option.name">{{option.name}}</mat-option></mat-autocomplete></mat-form-field>

在这种状态下它与对象一起工作

options = [{名称:'一个'}，{名称:'两个'}，{名称:'树'}，];

现在我希望它从数据 api 中工作:

0: {companyName: "ziro", cid: "524023240", Partners: Array(4)}1: {companyName: "plus", cid: "524023240", 合作伙伴: Array(2)}

我需要自动完成过滤公司名称.谢谢.

解决方案

组件:

 构造函数(私有服务:服务){this.filteredOptions = this.myControl.valueChanges.管道(从...开始('')，去抖动时间(400)，distinctUntilChanged(),switchMap(val => {返回 this.filter(val || '')}));}//过滤并返回值filter(val: string): Observable{//调用发出 http 请求的服务返回 this.service.getData().管道(地图(响应 => 响应.过滤器(选项 => {返回 option.name.toLowerCase().indexOf(val.toLowerCase()) === 0})))}}

服务:

opts = [];获取数据(){返回 this.opts.length ?(this.opts) :this.http.get('https://jsonplaceholder.typicode.com/users').pipe(tap(data => this.opts = data))}

要查看完整演示，请查看此链接 Stackblitz

I try to use auto complete from api but it not work. its work only without api.

this is my Component TS: inside there, There is a callback method with the data from the api (onGetTaxList)

import { Component, OnInit } from '@angular/core';
import { UsersService } from '../../../../core/services/users.service';
import { FormControl } from '@angular/forms';
import { Observable } from 'rxjs';
import { map, startWith } from 'rxjs/operators';

@Component({
  selector: 'app-create-process-modal',
  templateUrl: './create-process-modal.component.html',
  styleUrls: ['./create-process-modal.component.sass']
})
export class CreateProcessComponent implements OnInit {
  myControl = new FormControl();
  options = [
    { name: 'One' },
    { name: 'Two' },
    { name: 'Tree' },
  ];
  filteredOptions: Observable<any>;


  constructor(private service: UsersService) { }

  ngOnInit() {
    this.service.createNewProcess((data) => this.onGetTaxList(data));
    this.filteredOptions = this.myControl.valueChanges
      .pipe(
        startWith(''),
        map(value => this._filter(value))
      );
  }

  onGetTaxList(data) {
    console.log(data);
  }
  private _filter(value: string) {
    const filterValue = value.toLowerCase();

    return this.options.filter(option => option.name.toLowerCase().includes(filterValue));
  }
}

Component html:

<div class="formContainer">
    <h2 style="text-align: right">New Process</h2>
    <mat-form-field style="text-align: right">
        <input type="text" placeholder="Start Typing..." matInput [formControl]="myControl" [matAutocomplete]="auto">
        <mat-autocomplete #auto="matAutocomplete">
                <mat-option *ngFor="let option of filteredOptions | async" [value]="option.name">
                  {{option.name}}
                </mat-option>
              </mat-autocomplete>
    </mat-form-field>

</div>

In this state its work with the object

options = [
        { name: 'One' },
        { name: 'Two' },
        { name: 'Tree' },
      ];

and now i want its work from the data api:

0: {companyName: "ziro", cid: "524023240", partners: Array(4)}
1: {companyName: "plus", cid: "524023240", partners: Array(2)}

and i need the auto complete filter the companyName. Thanks.

解决方案

Component:

  constructor(private service: Service) { 
  this.filteredOptions = this.myControl.valueChanges
        .pipe(
          startWith(''),
          debounceTime(400),
          distinctUntilChanged(),
          switchMap(val => {
            return this.filter(val || '')
          })       
        );
  }

  // filter and return the values
 filter(val: string): Observable<any[]> {
    // call the service which makes the http-request
    return this.service.getData()
     .pipe(
       map(response => response.filter(option => { 
         return option.name.toLowerCase().indexOf(val.toLowerCase()) === 0
       }))
     )
   }  
}

Service:

opts = [];

getData() {
  return this.opts.length ?
    of(this.opts) :
    this.http.get<any>('https://jsonplaceholder.typicode.com/users').pipe(tap(data => this.opts = data))
}

For check full demo check this link Stackblitz

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