javascript - Angular：TypeScript 表中的搜索栏

Question

我已经完成了一个简单的 CRUD 应用程序，现在我必须添加一个搜索栏来过滤我的表格并向我显示与我数字相同的字母的行。

我不知道在我的组件中该做什么，我看到管道和过滤器的不同之处，但我无法将它们适应我的项目。

我想知道是否有一种方法可以在我的 component.ts 中实现而无需创建新方法。

组件.HTML

<div class="container">
  <ul class="table-wrapper">
    <div class="table-title">
      <div class="row">
        <div class="col-sm-4">
          <button *ngIf="metadata && metadata.addMD" (click)="addFunc(metadata)">{{metadata.addMD.label}}</button>
          <div class="show-entries">
            <span>Show</span>
            <label>
              <select [(ngModel)]="pageSize">
                <option *ngFor="let maxPerPage of rowsOnPageSet"
                        (click)="maxElements(maxPerPage)">{{maxPerPage}}</option>
              </select>
            </label>
            <span>users</span>
          </div>
        </div>

        <div class="col-sm-4">
          <h2 class="text-center">Users <b>Details</b></h2>
        </div>

        <div class="col-sm-4">
          <div class="search-box">
            <div class="input-group">
              <span class="input-group-addon"><i class="material-icons">&#xE8B6;</i></span>
--> //HERE I HAVE TO ADD THE FUNCTION OR SOMETHING ELSE
             <input type="text" class="form-control" [(ngModel)]="searchVal"
                 (ngModelChange)='checkSearchVal()'  placeholder="Search&hellip;">
            </div>
          </div>
        </div>
      </div>
    </div>

    <table class="table table-bordered">
      <thead>
      <tr>
        <th *ngFor="let col of columns" (click)="sortTable(col)">{{col}}
          <i *ngIf="col === columnSorted && !direction" class="material-icons">keyboard_arrow_up</i>
          <i *ngIf="col === columnSorted && direction" class="material-icons">keyboard_arrow_down</i>
        </th>
        <th>Actions</th>
      </tr>
      </thead>
      <tbody>
      <tr *ngFor="let user of users | paginate: {itemsPerPage: pageSize,
                                               currentPage: page,
                                               totalItems: users.length}">
        <td *ngFor="let col of columns">{{user[col]}}</td>
        <td>
          <button [ngClass]="getClassCondition(act.actionType)" *ngFor="let act of actions"
                  (click)="actionFunc(act, user)">{{act.label}}</button>

        </td>

      </tr>
      </tbody>
    </table>

    <div align="center">
      <!--<div class="hint-text">Showing <b>{{totUsersPerPage}}</b> out of <b>{{users.length}}</b> entries</div>-->
      <ul align="center">
        <pagination-controls (pageChange)="pageChanged($event)"></pagination-controls>
      </ul>
    </div>

  </ul>
</div>

COMPONENT.TS，在这里我必须创建适用于我的应用程序的正确方法。

    export class DynamicTableComponent implements OnInit {

  constructor(private userService: UserService,
              private resourcesService: ResourcesService,
              private router: Router) {
  }

  @Input()
  users = [];
  @Input()
  columns: string[];
  @Input()
  actions = [];
  @Input()
  metadata: any;
  @Input()
  class;

  direction = false;
  columnSorted = '';
  public rowsOnPageSet = ['5', '10', '15', '20', '25'];
  page = 1;
  private pageSize = 5;
  searchVal = '';

  /*totalPages = Math.trunc(this.users.length / this.pageSize);
  totUsersPerPage = this.pageSize;*/

  ngOnInit() {
  }

  actionFunc(action, element: any) {
    if (action.actionType === 'DELETE') {
        /*...*/
      }
    }
    if (action.actionType === 'GO_TO') {
        /*...*/
    }
  }

  addFunc(metadata) {
    if (metadata.addMD.actionType === 'ADD_TO') {
       /*...*/
    }
  }

  maxElements(maxPerPage) {
    this.rowsOnPageSet = maxPerPage;
  }

  sortTable(param) {
    /*...*/
  }

  getClassCondition(act) {
    return act === 'DELETE' ? this.class = 'btn btn-danger' : 'btn btn-primary';
  }

  pageChanged($event: number) {
     /*...*/
  }

checkSearchVal() {
    this.users.slice();
    const filteredUsers: User[] = [];
    if (this.searchVal && this.searchVal !== '') {
      for (const selectedUser of this.users) {
        if (selectedUser.firstName.toLowerCase().search(this.searchVal.toLowerCase()) !== -1 ||
          selectedUser.lastName.toLowerCase().search(this.searchVal.toLowerCase()) !== -1) {
          filteredUsers.push(selectedUser);
        }
      }
      this.users = filteredUsers.slice();
    }
  }

}

数据结构：in.memory-data.service.ts

import { InMemoryDbService } from 'angular-in-memory-web-api';
import { User } from './user';
import { Injectable } from '@angular/core';

export const COLUMNS = ['id', 'firstName', 'lastName', 'age'];

@Injectable({
  providedIn: 'root',
})
export class InMemoryDataService implements InMemoryDbService {
  createDb() {
    const USERS = [
      {id: 1, firstName: 'NAME_1', lastName: 'SURNAME_1', age: 23},
      {id: 2, firstName: 'NAME_2', lastName: 'SURNAME_2', age: 23},
      {id: 3, firstName: 'NAME_3', lastName: 'SURNAME_3', age: 23},
      {id: 4, firstName: 'NAME_4', lastName: 'SURNAME_4', age: 24},
      {id: 5, firstName: 'NAME_5', lastName: 'SURNAME_5', age: 42},
      {id: 6, firstName: 'NAME_6', lastName: 'SURNAME_6', age: 41},
      {id: 7, firstName: 'NAME_7', lastName: 'SURNAME_7', age: 24},
      {id: 8, firstName: 'NAME_8', lastName: 'SURNAME_8', age: 25},
      {id: 9, firstName: 'NAME_9', lastName: 'SURNAME_9', age: 25},
      {id: 10, firstName: 'NAME_10', lastName: 'SURNAME_10', age: 25},
      {id: 11, firstName: 'NAME_11', lastName: 'SURNAME_11', age: 22},
      {id: 12, firstName: 'NAME_12', lastName: 'SURNAME_12', age: 22},
      {id: 13, firstName: 'NAME_13', lastName: 'SURNAME_13', age: 24},
    ];
    return {USERS};
  }
}

用户.ts

export class User {
  id: number;
  firstName: string;
  lastName: string;
  age: number;
}

score 5 · Accepted Answer

只需创建一个 PIPE.ts 文件来过滤表：

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ 
    name: 'filterAll'
})
export class FilterPipe implements PipeTransform {
  transform(value: any, searchText: any): any {
    if(!searchText) {
      return value;
    }
    return value.filter((data) => this.matchValue(data,searchText)); 
  }

  matchValue(data, value) {
    return Object.keys(data).map((key) => {
       return new RegExp(value, 'gi').test(data[key]);
    }).some(result => result);
  }
 }

在声明中将 FilterPipe添加到app.module.ts 并将其添加到您的component.html：

  <form id="searchForm">
    <div class="form-group">
        <div class="input-group" id="filterAll">
          <div class="input-group-addon"><i class="glyphicon glyphicon-search"></i></div>
          <input type="text" class="form-control" name="searchString" placeholder="Search..." [(ngModel)]="searchString">
        </div>
    </div>
</form>

然后你在你的表的 TR 中添加一个管道，如下所示：

 <tr *ngFor="let user of users | paginate: {itemsPerPage: pageSize,
                                           currentPage: page,
                                           totalItems: users.length} | filterAll: searchString">

抱歉，我忘记了 component.ts 文件：您需要将 searchString 变量设置为：

public searchString: string;

score 2 · Accepted Answer

我看到你得到了答案......这是另一种值得的方法......正如评论中所讨论的......

checkSearchVal() {
    this.USERS = masterUSERS.slice();
    let filteredUsers: User[] = [];
    if (this.searchVal && this.searchVal != '') {

    /* NORMAL FOR
      for(var i=0; i<this.USERS.length; i++ ){
        if(this.USERS[i].firstName.toLowerCase().search(this.searchVal.toLowerCase()) != -1 || this.USERS[i].lastName.toLowerCase().search(this.searchVal.toLowerCase()) != -1 ){
          filteredUsers.push(this.USERS[i])
        }
      }
    */
    /* FOR EACH
      this.USERS.forEach((selectedUser) => {
        if (selectedUser.firstName.toLowerCase().search(this.searchVal.toLowerCase()) != -1 ||
          selectedUser.lastName.toLowerCase().search(this.searchVal.toLowerCase()) != -1) {
          filteredUsers.push(selectedUser);
        }
      })
    */

    /*  FOR OF */
    for (let selectedUser of this.USERS) {
        if (selectedUser.firstName.toLowerCase().search(this.searchVal.toLowerCase()) != -1 ||
          selectedUser.lastName.toLowerCase().search(this.searchVal.toLowerCase()) != -1) {
          filteredUsers.push(selectedUser);
        }
    }

      this.USERS = filteredUsers.slice();
    }
  }

更新：移动 this.USERS = filteredUsers.slice(); 中频内

更新：2：与 forEach 和 For-Of 相同的代码（摆脱 TSLint 错误）

javascript - Angular：TypeScript 表中的搜索栏

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