Angular - Submit a form programmatically

问题:

Angular - Submit a form programmatically.

I have a form group on the HTML and I want the component to submit the form's action with an email field in a post method. Instead of using a normal submit button.

Below's testMethod gets called from another button. In this method, I want to post the testForm. It has to be posted old school way as it needs an action.

This is my HTML:

  <form
    [formGroup]="testGroup"
    [action]='actionLink'
    method='POST'
    #testForm>
     <input name='Email' type='hidden' [value]='currentUserEmail'>
  </form>

This is my Component TS file attempt:

  @ViewChild('testForm') testFormElement;

  public currentUserEmail: string = '';
  public testGroup = this.formBuilder.group({
    Email: ''
  });


  public testMethod(): void {

      // Below: This currently doesnt seem to do anything.
      this.testFormElement.ngSubmit.emit();
  }

回答1:

import { Component, ViewChild } from '@angular/core';

@Component({
    template: `
        <form #testForm>
            <input name='Email' type='hidden'>
        </form>
    `
})
class MyComponent {
    @ViewChild('testForm') testFormEl;

    testMethod() {
        this.testFormEl.nativeElement.submit()
    }
}

回答2:

You can use ngNoForm with your form to remove ngForm handling and to add plain javascript handler.

you can use your code as follows:

Html file.

  <form ngNoForm
    [formGroup]="testGroup"
    [action]='actionLink'
    method='POST'
    #testForm>
     <input name='Email' type='hidden' [value]='currentUserEmail'>
  </form>

Ts File.

  @ViewChild('testForm') testFormElement;

  public currentUserEmail: string = '';
  public testGroup = this.formBuilder.group({
    Email: ''
  });


  public testMethod(): void {
      this.testFormElement.nativeElement.submit();
  }

回答3:

Regarding "Angular - Submit a form programmatically" Here is code where a form submits itself. It works for me. Hope this helps.

Component HTML:
    .
    .
    .  
            <form #myForm ngNoForm name="myForm" [action]="pdfServletUrl"          target="_blank" method="POST">
                 <button type="submit" [hidden]="'true'"></button>
            </form>
    .
    .
    .
    Component TypeScript:           
    .
    .
    .
    @ViewChild('myForm') myForm : ElementRef;
    .
    .
    .
    ngAfterViewInit() {
     this.myForm.nativeElement.submit();
    }
    .
    .
    .

回答4:

I think you should get ngForm in your code. So, rewrite your code as follows:

<form
[formGroup]="testGroup"
[action]='actionLink'
method='POST'
#testForm="ngForm" (ngSubmit)="testForm.form.valid ? yourSaveMethod() :showValidatinErrors()">
 <input name='Email' type='hidden' [value]='currentUserEmail'>

and in your ts file:

`@ViewChild('testForm') testFormElement:ngForm;

public testMethod(): void {

  // Below: This works for me.
  this.testFormElement.ngSubmit.emit();
}
public yourSaveMethod(): void {

  // post your model here.

}