In this case, you can simple use a “reference variable” and ask about “reference variable”.emailform.invalid
<div>
<!--use a "reference variable" to can refered to the component-->
<hello #form></hello>
<div class="form-group">
<button class="btn btn-primary" [disabled]="form.emailForm?.invalid">Submit</button>
</div>
</div>
<!--just for "check" -->
{{form.emailForm?.value|json}}
See that “form” is the component. the component has a variable “emailForm”
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solved Disable/Enable submit button in parent component when forms are in child component