Angular2 – Validate and submit form from outside

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You can link the button to the form using the form attribute on the button:

<form (ngSubmit)="save()" id="ngForm" #documentEditForm="ngForm"> 
  ... 
</form>

<button form="ngForm">
  SAVE
</button>

You can still check its validity like this:

<button form="ngForm" [disabled]="!documentEditForm.form.valid">
  SAVE
</button>

The form needs to have an ID id="example-form" and the submit button a matching ID in the form="example-form"

See here for more details: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#attr-form

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