angular2.x 多选框事件

angular2.x - 4.x  的多选框事件

ng2 -- ng4 反正都是用es6 都统称为2.x吧。

下面贴代码

html界面

<div class="row">
    <div class="col-md-9">
        <table>
            <thead>
                <tr>
                    <th><input type="checkbox" (click)="selectAll($event)" [checked]="isSelectedAll()" />全选</th>
                </tr>
            </thead>
            <tbody>
                <tr *ngFor="let item of itemList">
                    <td>
                        <input type="checkbox" [checked]="isCheck(item)" (click)="clickItem($event,item)" />
                    </td>
                    <td>{{ item }}</td>
                </tr>
            </tbody>
        </table>
    </div>
</div>

ts代码:

import { Component, OnInit } from '@angular/core';
import { RankingService } from '../ranking/services/ranking.service';

@Component({
  selector: 'app-classify',
  templateUrl: './classify.component.html',
  styleUrls: ['./classify.component.css']
})
export class ClassifyComponent implements OnInit {
    public itemList: Array<any>;
    public selected: Array<any>;
    public allList: Array<any>;
    public idListAll: Array<any>;
    constructor() {
      this.itemList = [1, 2, 3, 4];
      this.allList = [1, 2, 3, 4];
      this.idListAll = [1, 2, 3, 4];
      this.selected = [];
    }
    ngOnInit() {}
      //   点击时执行
    clickItem(e, item) {
      const checkbox = e.target;
      const action = (checkbox.checked ? 'add' : 'remove');
      this.updateSelected(action, item);
    }
    // 用来判断input 的checked
    isCheck(item) {
      return this.selected.findIndex(value => value == item) >= 0;
    }
    //  执行增加、删除
    private updateSelected(action, item) {
          if (action == 'add' && this.selected.findIndex(value => value == item) == -1){
            console.log('执行添加');
            this.selected.push(item);
          }
          if (action == 'remove' && this.selected.findIndex(value => value == item) != -1){
            console.log('执行删除');
            this.selected.splice(this.selected.findIndex(value => value == item), 1);
          }
      console.log(this.selected);
    }
    // 全选点击事件
    selectAll(e) {
      const checkbox = e.target;
      const action = (checkbox.checked ? 'add' : 'remove');
      this.allList.forEach((elt, i, array) => {
        const entity = elt;
        this.updateSelected(action, entity);
      });
    }

    // 判断是否全选
    isSelectedAll() {
      return this.isContained(this.selected, this.idListAll);
    }
    // 判断b数组是否包含在a数组中
    private isContained(a, b) {
      if (!(a instanceof Array) || !(b instanceof Array)) return false;
      if (a.length < b.length) return false;
      const aStr = a.toString();
      for (let i = 0, len = b.length; i < len; i++) {
        if (aStr.indexOf(b[i]) == -1) {
          return false;
        }
      }
      return true;
    }
}

界面效果

 全选

添加

删除

 最近才刚刚开始接触ng2 ，每天进步一点点，总有一天我也会很6的。