8

所以我在这里使用了指南：https ://angular.io/docs/ts/latest/cookbook/dynamic-form.html

我需要向现有字段添加更多字段。我做了一些有用的东西，但它很笨重，当我点击它时它会重置表单。下面的代码：

在动态-form.component.ts 中：

add_textbox()
{
    this.questions.push(this.questionService.create_textbox({key: "test", label: "Test"}));
    console.log(this.questions);
    this.form = this.qcs.toFormGroup(this.questions);
}

有问题.service.ts

create_textbox({key, value, label = '', order = 1, type = "text", description = "", help = ""}: {key?: any, value?: any, label?: any, order?: any, type?: any, description?: any, help?: any})
{
    return new TextboxQuestion({
        key,
        label,
        value,
        order,
        description,
        type
    });
}

我的按钮也在里面，dynamic-form.component.html但我希望它在里面dynamic-form-question.component.ts。这可能吗？

4

3 回答 3

18

首先

import { FormGroup,FormArray,FormBuilder,Validators } from '@angular/forms';

然后

 addForm: FormGroup; // form group instance

constructor(private formBuilder: FormBuilder) {}
    ngOnInit() { 
        //    *** this is code for adding invoice details ***
         this.addForm = this.formBuilder.group({
            invoice_no: ['', Validators.required],
            file_no: ['', Validators.required],
            description: ['', Validators.required],
            linktodrive: this.formBuilder.array([
                this.initLink(),
            ])
        });
    }
    initLink() {
        return this.formBuilder.group({
            linkAddress: ['', Validators.required]
        });
    }
    addLink() {
        const control = < FormArray > this.addForm.controls['linktodrive'];
        control.push(this.initLink());
    }
    removeLink(i: number) {
        const control = < FormArray > this.addForm.controls['linktodrive'];
        control.removeAt(i);
    }

使用以下命令开始和关闭您的 HTML：

<div formArrayName="linktodrive"></div>

要在表单中创建和删除动态字段，请使用此 html：

<div *ngFor="let address of addForm.controls.linktodrive.controls; let i=index">
<div>
<span>Link {{i + 1}}</span>
<span *ngIf="addForm.controls.linktodrive.controls.length > 1"><a (click)="removeLink(i)">REMOVE</a></span>
</div>

<!-- Angular assigns array index as group name by default 0, 1, 2, ... -->
<div [formGroupName]="i">
<input type="text" placeholder="Enter Link" formControlName="linkAddress">
</div>
</div>

最后是“添加”链接

<div><a (click)="addLink()"></a></div>
于 2016-12-21T07:31:29.920 回答
2

我浏览了一篇非常有用的博客文章，效果很好。以反应形式动态添加行 angular 6。评论代码中的任何疑问

于 2019-04-26T12:34:38.133 回答
1

获胜的解决方案可能有点过时了。使用新的 ng'6 语法的代码或多或少看起来像这样：

控制器：

form = this.fb.group({
    title: ['New Project Name'],
    tasks: this.fb.group({
        title: ['Task title XX'],
        content: ['What is this about'],
        **subtasks: this.fb.array([this.initTask()]),**
        points: ['5'],
        hints: ['No hints']
    })
});
constructor(private fb: FormBuilder) {}

ngOnInit() {}

onSubmit() {
    console.log(this.form);
}

initTask() {
    return this.fb.group({
        subtask: ['', Validators.required]
    });
}

get tasksControl () {
    return this.form.get('tasks') as FormGroup;
}

get subtaskControl () {
    return this.tasksControl.get('subtasks') as FormArray;
}

addLink() {
    this.subtaskControl.push(this.initTask());
}
removeLink(i: number) {
    this.subtaskControl.removeAt(i);
}

并使用这样的html：

<div formArrayName="subtasks">
    <div *ngFor="let subtask of subtaskControl.controls; let i=index">
        <div [formGroupName]="i">
            <input type="text" placeholder="Enter Link" formControlName="subtask">
        </div>
        <div>
            <a class="btn btn-danger btn-sm" (click)="removeLink(i)">REMOVE</a>
            <a class="btn btn-success btn-sm" (click)="addLink()">Add</a>
        </div>
    </div>
</div>
于 2018-09-16T21:47:24.960 回答