angular - 如何删除表应用程序 Angular 2 中的任何行？

Question

我不会用这种方法删除我表中的任何行:

  deleteRowAdressForm(){
    this.rowDataMainForm.splice(1, 1);
}

  rowDataMainForm = [{
    name: '',
    email: '',
    tel: '',
    adress: '',
    delete: '',
}];

此方法删除行中的第一个元素，我不会删除表中的任何行

更新并使用 ChangeDetectorRef 后，但这还不起作用

完整代码:

import {Component, OnInit, Input, ChangeDetectorRef} from '@angular/core';


@Component({
    selector: 'tabletree',
    templateUrl:'app/tabletree.component.html',
})
export class TableTreeComponent{

constructor(private changeDetectorRef: ChangeDetectorRef){

}


rowDataMainForm = [{
    name: '',
    email: '',
    tel: '',
    adress: '',
    delete: '',
}];

rowDataAdressForm = [{
    country: '',
    city: '',
    zipcode: '',
    street: '',
    delete: '',
}];

rowDataHomeForm = [{
    home: '',
    campus: '',
    province: '',
    area: '',
    delete: '',
}];

addRowMainForm(mainFormIndex){
    this.rowDataMainForm.push({
        name: '',
        email: '',
        tel: '',
        adress: '',
        delete: '',
    })
}

addRowAdressForm(){
    this.rowDataAdressForm.push({
        country: '',
        city: '',
        zipcode: '',
        street: '',
        delete: '',
    })
}

addRowHomeCampusProvinceAreaForm(){
    this.rowDataHomeForm.push({
        home: '',
        campus: '',
        province: '',
        area: '',
        delete: '',
    })
}

deleteRowAdressForm(addressFormIndex: number){
    this.rowDataMainForm.splice(addressFormIndex, 1);
    this.changeDetectorRef.detectChanges();
}

deleteRowStreetCityZipcodeForm(delRowStCZFormIndex: number){
    this.rowDataAdressForm.splice(delRowStCZFormIndex, 1);
    this.changeDetectorRef.detectChanges();
}

deleteRowHomeForm(homeFormIndex: number){
    this.rowDataHomeForm.splice(homeFormIndex, 1);
    this.changeDetectorRef.detectChanges();
}

}

和这个 html

<div class="panel panel-default">
    <div class="panel-heading text-center">
        <h4 class="panel-title">
            Подразделение
        </h4>
    </div>
<table class="table table-bordered">
<tr>
    <th>name</th>
    <th>email</th>
    <th>tel</th>
    <th>adress</th>
    <th>delete</th>
</tr>
<tr *ngFor="let row of rowDataMainForm; let mainFormIndex = index">
    <td><input type="text" class="form-control"></td>
    <td><input type="text" class="form-control"></td>
    <td><input type="text" class="form-control"></td>
    <td>
        <div class="panel panel-default smaller">    
        <table class="table table-condensed table-bordered">
            <thead>
            <tr>
                <th>country</th>
                <th>city</th>
                <th>zipcode</th>
                <th>street</th>
                <th></th>
            </tr>
            </thead>
            <tr *ngFor="let newrow of rowDataAdressForm; let addressFormIndex = index">
                <td></td>
                <td></td>
                <td></td>
                <td>
                    <div class="panel panel-default smaller">
                        <table class="table table-condensed table-bordered">
                            <thead>
                                <tr>
                                    <th>home</th>
                                    <th>campus</th>
                                    <th>province</th>
                                    <th>area</th>
                                    <th></th>
                                </tr>
                            </thead>
                            <tr *ngFor="let suchnewrow of rowDataHomeForm; let homeFormIndex = index">
                                <td></td>
                                <td></td>
                                <td></td>
                                <td></td>
                                <td>
                                    <button (click)="deleteRowHomeForm(homeFormIndex)" type="button" class="btn btn-default" style="padding: 2px">Delete</button>
                                </td>
                            </tr>
                        </table>
                        <div class="panel-footer">
                            <div class="container-build">
                                <button (click)='addRowHomeCampusProvinceAreaForm()' type="button" class="btn btn-default" style="padding: 2px">Add row</button>
                            </div>
                        </div>
                    </div>
                </td>
                <td>
                    <button (click)='deleteRowStreetCityZipcodeForm(delRowStCZFormIndex)' type="button" class="btn btn-default" style="padding: 2px">Delete</button>
                </td>
            </tr>
        </table>
        <div class="panel-footer">
            <div class="container-build">
                <button (click)='addRowAdressForm()' type="button" class="btn btn-default" style="padding: 2px">Add row</button>
            </div>
        </div>
        </div>
    </td>
    <td>
        <button (click)='deleteRowAdressForm(addressFormIndex)' type="button" class="btn btn-default">Delete</button>
    </td>
</tr>
</table>
<div class="panel-footer">
    <div class="container-build">
        <button (click)='addRowMainForm(mainFormIndex)' type="button" class="btn btn-default">Add row</button>
    </div>
</div>
</div>

Answer 1

您看不到任何更新，因为更改检测未在数组中的嵌套对象上运行。您有两个选择:

1. 每次您更改数组中的某些内容时，将其分配为新对象，因为更改检测仅查找引用更改。

2. 自己触发变更检测(这就是我将向您展示的内容，因为第一个选项不言自明)

---

导入ChangeDetectorRef:

import {ChangeDetectorRef} from '@angular/core';

将 ChangeDetectorRef 注入(inject)到您的组件中:

constructor(private changeDetectorRef: ChangeDetectorRef, /* other injections here */) { 
    // ...
}

在您的方法中使用它来检测变化:

deleteRowAdressForm(rowNumber: number){
    this.rowDataMainForm.splice(rowNumber, 1);
    this.changeDetectorRef.detectChanges();
}

---

您需要对模板进行的更改:

在您使用的每个 *ngFor 上，您需要像这样添加 index 变量:

*ngFor="let row of table; let rowIndex = index"

然后在您的 (click) 删除事件中，您可以像这样利用它:

(click)="deleteRow(rowIndex)"

我在这里使用用法编辑了你的模板，但不要忘记像我上面那样将参数添加到你的删除函数中!

<div class="panel panel-default">
    <div class="panel-heading text-center">
        <h4 class="panel-title">
            Подразделение
        </h4>
    </div>
<table class="table table-bordered">
<tr>
    <th>name</th>
    <th>email</th>
    <th>tel</th>
    <th>adress</th>
    <th>delete</th>
</tr>
<tr *ngFor="let row of rowDataMainForm; let mainFormIndex = index">
    <td><input type="text" class="form-control"></td>
    <td><input type="text" class="form-control"></td>
    <td><input type="text" class="form-control"></td>
    <td>
        <div class="panel panel-default smaller">    
        <table class="table table-condensed table-bordered">
            <thead>
            <tr>
                <th>country</th>
                <th>city</th>
                <th>zipcode</th>
                <th>street</th>
                <th></th>
            </tr>
            </thead>
            <tr *ngFor="let newrow of rowDataAdressForm; let addressFormIndex = index">
                <td></td>
                <td></td>
                <td></td>
                <td>
                    <div class="panel panel-default smaller">
                        <table class="table table-condensed table-bordered">
                            <thead>
                                <tr>
                                    <th>home</th>
                                    <th>campus</th>
                                    <th>province</th>
                                    <th>area</th>
                                    <th></th>
                                </tr>
                            </thead>
                            <tr *ngFor="let suchnewrow of rowDataHomeForm; let homeFormIndex = index">
                                <td></td>
                                <td></td>
                                <td></td>
                                <td></td>
                                <td>
                                    <button (click)="deleteRowHomeForm(homeFormIndex)" type="button" class="btn btn-default" style="padding: 2px">Delete</button>
                                </td>
                            </tr>
                        </table>
                        <div class="panel-footer">
                            <div class="container-build">
                                <button (click)='addRowHomeCampusProvinceAreaForm()' type="button" class="btn btn-default" style="padding: 2px">Add row</button>
                            </div>
                        </div>
                    </div>
                </td>
                <td>
                    <button (click)='deleteRowStreetCityZipcodeForm(/* ??? */)' type="button" class="btn btn-default" style="padding: 2px">Delete</button>
                </td>
            </tr>
        </table>
        <div class="panel-footer">
            <div class="container-build">
                <button (click)='addRowAdressForm()' type="button" class="btn btn-default" style="padding: 2px">Add row</button>
            </div>
        </div>
        </div>
    </td>
    <td>
        <button (click)='deleteRowAdressForm(addressFormIndex)' type="button" class="btn btn-default">Delete</button>
    </td>
</tr>
</table>
<div class="panel-footer">
    <div class="container-build">
        <button (click)='addRowMainForm(mainFormIndex)' type="button" class="btn btn-default">Add row</button>
    </div>
</div>
</div>