One element I have in my Reactive Form is the formControl:
<input class="input" formControlName="email" [placeholder]="">
I'm curious if it's possible to dynamically set the placeholder text using code?
For example:
this.formGroup.get('email').placeholder = 'Some value';The property known as placeholder belongs to the HTML element itself, not the formGroup. By binding it directly using a component property like you are currently doing ([placeholder]="someValue"), Angular's change detection will automatically keep it up to date.
Alternatively, you can access the element itself using @ViewChild and update its placeholder value using plain JavaScript:
<input #myInput />
// ...
@ViewChild('myInput') myInput: ElementRef;
// ...
myInput.nativeElement.placeholder = 'New Thing';
If you find yourself consistently needing this functionality for placeholders, consider creating a custom Directive to handle it in a more organized manner.
If you want to create a custom placeholder for your component, you can define a function like this:
getCustomPlaceholder(key: string): string
This function will dynamically generate the placeholder text based on the input key.
In your component template, you can then use this function like so:
<input class="input" formControlName="email" [placeholder]="getCustomPlaceholder('email')">
Another option is to extend the FormControl class by creating a custom class:
export class CustomFormControl extends FormControl {
_customPlaceholder: string
constructor(...config) {
super(config)
}
set customPlaceholder(key:string){
this._customPlaceholder = key
}
get customPlaceholder() {
return this._customPlaceholder
}
}
You can then add your custom form control to the FormGroup and access the custom placeholder using
form.controls['email'].customPlaceholderImplementing a ternary operator in [specific context] is also possible. For instance,
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