Angular2-删除后更新UI

Question

我有一个angular2应用程序，其后端是在java中。我有一份客户名单。当我单击以删除客户时，客户将被删除，但列表不会更新。如果我手动刷新页面，则列表会更新。我尝试在delete方法的订阅中路由到列表组件，但这不起作用。

列表customers.component.html

<tr [class.warning]="customer.isDefault == 1" *ngFor="let customer of customers | orderBy:['firstName'] | search:searchCustomer.value;let serial = index">
                <td>{{ serial+1 }}</td>
                <td>{{ customer?.firstName+' '+customer?.lastName}}</td>
                <td>{{ customer.email}}</td>
                <td>{{ customer.mobileNumber}}</td>
                <td>{{ customer.streetAddress}}</td>
                <td>{{ customer.priceList?.name}}</td>
                <td><a [routerLink]="['/loggedIn','customer','edit', customer.id ]"><i class="fa fa-edit fa-2x"></i></a></td>
                <td><a (click)="delete(customer)"><i class="fa fa-trash-o fa-2x"></i></a></td>
              </tr>

列表customers.component.ts

    ngOnInit()
    {
        this.refreshCustomersList();
    }

    delete(customer)
    {
        this.userService.delete(customer.id)
            .subscribe(
                success=>
                {
                    var index = this.customers.indexOf(customer, 0);
                    if (index > -1)
                    {
                        this.customers.splice(index, 1);
                    }
                }
            )

    }

    refreshCustomersList()
    {
        this._authHttp.get(
                this.appService.getApiUrl() + "api/customer/list"
            )
            .map(res=>res.json())
            .subscribe(
                successResponse=>
                {
                    this.customers = successResponse.data.customers;
                },
                () => console.log("Request Completed")
            )

    }
}

Answer 1

尝试在this.refreshCustomersList();函数中调用delete，如下所示：

    delete(customer)
{
    this.userService.delete(customer.id)
        .subscribe(
            success=>
            {
                var index = this.customers.indexOf(customer, 0);
                if (index > -1)
                {
                    this.customers.splice(index, 1);
                    this.refreshCustomersList();
                }
            }
        )

}

这将在客户被删除后更新customers阵列。

Answer 2

Splice将返回已删除的元素，而不是使用slice在删除后返回结果数组，如： -

this.customers = this.customers.slice(index);

Answer 3

我们可以按如下方式设置客户列表，而不是再次从API获取整个列表。它对我有用：

delete(customer)
{
    this.userService.delete(customer.id)
        .subscribe(
            success=>
            {
                var index = this.customers.indexOf(customer, 0);
                if (index > -1)
                {
                    this.customers = this.customers.splice(index, 1);
                }
            }
        )

}

Answer 4

在HTML中输入以下代码：

(click)="delete(customer.length-1-i)".
//
deleteFieldValue(index) {
this.customer.splice(index, 1);
this.revervefordispaly();
}

//for reverse:

revervefordispaly(){
this.reversedProductdata.reverse();
}

Answer 5

你可以像这样使用JavaScript数组过滤器。

    this.userService.delete(customer.id)
    .subscribe(
        success=>
        {

             let newCustomers = this.customers.filter(item => item.id !== customer.id);
             this.customers = newCustomers;
        }
    )