如何使用按钮添加更多输入字段 – Angular 2动态表单

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

我需要在现有字段中添加更多字段.我做了一些有用的东西,但它很笨重,当它击中它时它重置了形状.代码如下：

在dynamic-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);
}

在question.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,order,description,type
    });
}

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

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: ['',description: ['',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HTML：

< div formArrayName =“linktodrive”>< / div>

要创建和删除表单的动态字段,请使用以下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“ADD”链接

<div><a (click)="addLink()"></a></div>

原文链接：https://www.f2er.com/angularjs/140875.html

如何使用按钮添加更多输入字段 – Angular 2动态表单

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