提交带有角度的表单到 Json 文件

Question

我想提交我的表单并有一种方法可以用我新创建的用户更新我的表。

我从今天早上就卡住了。

我已经有一个删除方法但错过了创建方法

这是我的 html

<div class="manage-content">

  <div class="title">

    <mat-icon class="user-icon">how_to_reg</mat-icon>

    <h3>Create a user</h3>

  </div>

      <form [formGroup]="form" (ngSubmit)="onSubmit()">

        Value : {{form.value | json}}

        <div class="form">

        <div class="leftSide">

        <mat-form-field class="full-width-input" appearance="outline">

          <input id="firstName" matInput placeholder="First name" formControlName="f_name" #f_name>

          <mat-error *ngIf="isFieldInvalid('f_name')">

            The first name you've entered is malformed.

          </mat-error>

        </mat-form-field>

        <mat-form-field class="full-width-input" appearance="outline">

          <input id="middleName" matInput placeholder="Middle name" formControlName="m_name" #m_name>

          <mat-error *ngIf="isFieldInvalid('m_name')">

            The middle name you've entered is malformed.

          </mat-error>

        </mat-form-field>

        <mat-form-field class="full-width-input" appearance="outline">

          <input id="lastName" matInput placeholder="Last name" formControlName="l_name" #l_name>

          <mat-error *ngIf="isFieldInvalid('l_name')">

            The last name you've entered is malformed.

          </mat-error>

        </mat-form-field>

        <mat-form-field class="full-width-input" appearance="outline">

          <input id="email" matInput placeholder="Email" formControlName="email" #email>

          <mat-error *ngIf="isFieldInvalid('email')">

            The email you've entered is malformed.

          </mat-error>

非常感谢你的帮助