Angular：TypeScript 中的搜索栏 table

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 table 并显示与我数字相同的字母的行。

我不知道在我的组件中做什么，我看到管道和过滤器有不同的东西，但我无法使它们适应我的项目。

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

COMPONENT.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};
  }
}

user.ts

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

Answer 1

只需创建一个 PIPE.ts 文件来过滤 table:

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);
  }
 }

将 FilterPipe 添加到 app.module.ts 中的 declarations 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>

然后像这样向 table 的 TR 添加管道：

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

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

public searchString: string;

Answer 2

我看到你得到了答案...here 是另一种有价值的方法...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：移动了this.USERS = filteredUsers.slice()；在 IF

内

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

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