如何使用按钮添加更多输入字段 - Angular 2 动态表单 [英] How to add more input fields using a button - Angular 2 dynamic forms

问题描述

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.代码如下:

在动态form.component.ts中:

add_textbox(){this.questions.push(this.questionService.create_textbox({key: "test", label: "Test"}));控制台日志(这个.问题)；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}){返回新的文本框问题({钥匙，标签，价值，命令，描述，类型});}

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?

解决方案

首先

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

然后

 addForm: FormGroup;//表单组实例构造函数(私有 formBuilder:FormBuilder){}ngOnInit() {//*** 这是用于添加发票详细信息的代码 ***this.addForm = this.formBuilder.group({发票编号:[''，Validators.required]，file_no: ['', Validators.required],描述:[''，Validators.required]，链接到驱动器:this.formBuilder.array([this.initLink(),])});}初始化链接(){返回 this.formBuilder.group({链接地址:[''，Validators.required]});}添加链接(){常量控制 = <表格阵列 >this.addForm.controls['linktodrive'];control.push(this.initLink());}removeLink(i: number) {常量控制 = <表格阵列 >this.addForm.controls['linktodrive'];control.removeAt(i);}

开始和结束您的 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><span>链接{{i + 1}}</span><span *ngIf="addForm.controls.linktodrive.controls.length > 1"><a (click)="removeLink(i)">REMOVE</a></span>
<!-- Angular 默认将数组索引指定为组名 0, 1, 2, ... --><div [formGroupName]="i"><input type="text" placeholder="输入链接" formControlName="linkAddress">

最后是添加"链接

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

So I used the guide here: https://angular.io/docs/ts/latest/cookbook/dynamic-form.html

I need to add more fields to an existing field. I've made something that works, but it's clunky and it resets the form when I hit it. Code below:

In dynamic-form.component.ts:

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

In 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,
        value,
        order,
        description,
        type
    });
}

My button is also in dynamic-form.component.html but I'd like it to be in dynamic-form-question.component.ts instead. Is this possible?

解决方案

first of all

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

then

 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);
    }

Begin and close your HTML with:

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

For creating and removing dynamic fields to your form use this 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>

And finally the "ADD" link

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

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