如何动态绑定复选框 Angular 2 的值

Question

大家好：我有一个组件。组件视图有一个表：

<div class="container">
<h2>Recipients List</h2>
<br>
<table class="table table-striped">
    <thead>
        <tr>
            <th>Id</th>
            <th>Name</th>
            <th>Phone</th>
            <th>Status</th>
            <th>Select</th>
        </tr>
    </thead>
    <tbody>
        <tr *ngFor="#rp of arrAll">   
            <td>{{rp.id}}</td>             
            <td>{{rp.name}}</td>
            <td>{{rp.phone}}</td>                
            <td>{{rp.isActivated?'Active':'Inactive'}}</td>             
            <td>
                <input #{{rp.id}}  type="checkbox" (change)="checkbox(value)">
            </td>
        </tr>          
    </tbody>
</table>
<button class="btn btn-success" (click)="newRecipient()">New Recipient</button>
<button class="btn btn-danger pull-right" (click) ="deleteRecipients()">Delete Recipients</button>

下面是使用 *ngFor 生成的表视图图像的链接。

业务逻辑是"单击删除按钮时，必须删除所有选中的收件人"。我想将一个参数传递给我的删除函数（我认为它应该是一个包含检查的收件人 ID 的数组）

这是我的组件代码：

import {Component} from 'angular2/core';
import {CORE_DIRECTIVES} from 'angular2/common';
import { Router, RouteParams } from 'angular2/router';
import {RecipientsService}    from'../../services/recipients/recipients.service';
import {Recipient} from '../../models/recipient/recipient';
@Component({
selector: 'recipient-list-view',
templateUrl: './app/components/recipient-list-view/recipient-list-view.html',
styleUrls: ["./app/components/recipient-list-view/style.css"]
})
export class RecipientListViewComponent {
arrAll: Recipient[];
constructor(private recipientsService: RecipientsService, params:    RouteParams, private router: Router) {
    this.arrAll = recipientsService.getAll();        
}
newRecipient() {
    this.router.navigate(['../NewRecipient']);
}
deleteRecipients() {  //need to know which recipients are checked
    console.log("delete");
}

}

我想知道如何实现这一目标。

干杯

Answer 1

向收件人添加属性selected。在复选框更改上，将其设置为 true。

用户单击"删除所有收件人"后，只需筛选列表中选择的收件人即可。

像这样：

<div class="container">
    <h2>Recipients List</h2>
    <br>
    <table class="table table-striped">
        <thead>
            <tr>
                <th>Id</th>
                <th>Name</th>
                <th>Phone</th>
                <th>Status</th>
                <th>Select</th>
            </tr>
        </thead>
        <tbody>
            <tr *ngFor="#rp of arrAll">   
                <td>{{rp.id}}</td>             
                <td>{{rp.name}}</td>
                <td>{{rp.phone}}</td>                
                <td>{{rp.isActivated?'Active':'Inactive'}}</td>             
                <td>
                    <input #{{rp.id}}  [(ngModel)]="rp.selected" type="checkbox" (change)="checkbox(rp)">
                </td>
            </tr>          
        </tbody>
    </table>
    <button class="btn btn-success" (click)="newRecipient()">New Recipient</button>
    <button class="btn btn-danger pull-right" (click) ="deleteRecipients()">Delete Recipients</button>
</div>

和组件：

export class RecipientListViewComponent {
     arrAll: Recipient[];
     constructor(private recipientsService: RecipientsService, params: RouteParams, private router: Router) {
        this.arrAll = recipientsService.getAll();        
    }
    newRecipient() {
        this.router.navigate(['../NewRecipient']);
    }
    deleteRecipients() {  //need to know which recipients are checked
        let selected = this.arrAll.filter((x) => x.selected)
        console.log(selected);
    }
    checkbox(recipient) {
        recipient.selected = (recipient.selected) ? false : true;
    }
}

Answer 2

如果可以向"收件人"模型再添加一个属性，则跟踪所选记录非常容易。

在收件人模型中添加了"选定"属性，并将复选框双向绑定到选定属性。

<input #{{rp.id}}  type="checkbox" [(ngModel)]="rp.selected">

现在在组件中添加一个方法来获取所有选定的记录

private getSelected() {
    return this.arrAll.filter((item) => item.selected);
}

然后获取所选记录

deleteRecipients() {  
    console.log(this.getSelected());
}

Answer 3

在控制器中添加一个函数，该函数将在选中复选框时触发（ng-单击复选框）。根据复选框的值，您将知道它是被选中还是未选中。为已检查的收件人列表维护另一个模型。如果选中，则将收件人追加到列表中，如果未选中，则删除。调用删除时，只删除该模型中的？