Angular4 form response function example analysis

This article mainly introduces the form response function of Angular4 programming, and analyzes the specific implementation steps and related operating techniques of the Angular4 form response function in the form of examples. Friends in need can refer to it. I hope it can help everyone.

Responsive form

1. The responsive form needs to inject the responsive form module into the appmodule file

import { FormsModule, ReactiveFormsModule } from '@angular/forms'；
<!--
  这里引用模块的时候要注意，具体是哪个module文件使用了表单，
  因为在某些情况下表单是被appmodule下的某个子module文件使用，
  那么就要在该子module文件中引入响应式表单模块。
-->
@NgModule(
  {imports: [FormsModule, ReactiveFormsModule……]
  ……}

2. Reference

in the form.component.ts component. The first way:

import { Component } from '@angular/core';
import { FormGroup, FormControl, FormBuilder} from '@angular/forms';
@Component({
 templateUrl: 'forms.component.html'
})
export class FormsComponent {
 formModel: FormGroup;
 constructor(fb: FormBuilder) {
  this.formModel= fb.group({
   formControl1: [''],
   formControl2: [''],
   ……
  });
 }
 onSubmit () {
  console.log(this.formModel.value);
 }
}

Second way:

import { Component } from '@angular/core';
import { FormGroup, FormControl} from '@angular/forms';
@Component({
 templateUrl: 'forms.component.html'
})
export class FormsComponent {
 formModel: FormGroup; /*这里定义表单变量名，HTML文件中绑定时使用*/
 constructor() {
  this.formModel= new FormGroup({
    formControl1: new FormControl(),
    formControl2: new FormControl(),
    ……
  });
 }
 onSubmit () {
  console.log(this.formModel.value);
 }
}

3. Corresponding HTML file

<form action="" method="post" [formGroup]=&#39;formModel&#39;> <!-- 通过指令绑定ts文件中命名的变量名 --!>
  <p class="form-group row">
   <p class="col-md-6">
    <p class="row">
     <label>formControl1</label>
     <input type="text" formControlName=&#39;formControl1&#39;>
    </p>
   </p>
   <p class="col-md-6">
    <p class="row">
     <label>formControl2</label>
    <input type="text" formControlName=&#39;formControl2&#39;>
    </p>
   </p>
  </p>
</form>

##At this point, a simple responsive form is completed.

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Detailed explanation of the input properties and output properties of Angular4

Project preparation and environment building operations in Angular4

About Angular4.0 data binding matters

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