Can someone guide me on how to restrict input to only accept alphabet characters in Angular? I am working with reactive forms and currently using a pattern validation which only gets triggered when the form is submitted. However, I need the input field to instantly ignore any numbers or special characters entered. For instance, if the user presses the number "1" on the keyboard, it should not be displayed at all. Is there a way to achieve this instant restriction?
If you're looking to implement input masking in your project, consider using a library like https://www.npmjs.com/package/ngx-mask. Alternatively, you can create your own solution by following this example:
this.form.controls["Input Field Name"].valueChanges.subscribe((value: string) => {
this.form.controls["Input Field Name"].setValue(value.replace(/[^A-Za-z]/, ""), { emitEvent: false });
});
If your goal is to validate input, it's important to consider a user-friendly approach. Simply enforcing input without clear feedback can be frustrating for users who may not understand what they did wrong. A better validation strategy includes providing errors with explanations to help users correct their input. (if you have other reasons for requesting this, feel free to disregard my comment)
For input validation, you can use the following pattern:
<input matInput type="text" [formControl]="your-control-name" pattern="[ a-zA-Z]*">
To handle validation errors related to the pattern, you can include the following code: <mat-error *ngIf="formHandlersList[i].hasError('pattern')"> Only alphabetic characters are allowed
The complete HTML block would look something like this -
<mat-form-field appearance="standard" [style.width.px]="120">
<input matInput type="text" [formControl]="your-control-name" pattern="[ a-zA-Z]*">
<mat-error *ngIf="<your-form-control-object>.hasError('pattern')">
Only alphabetic characters are allowed
</mat-error>
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