I have successfully created a form using control forms.
idAnnuaire: new FormControl('',[Validators.minLength(6),Validators.maxLength(6)]),
However, I am facing an issue where when the field is left empty,
{{form.controls.idAnnuaire.valid }}true instead of false (expected behavior).
I prefer not to set the control form as required because users should be able to submit the form even if they haven't filled in the idAnnuaire input, as long as other fields are completed.
To address this issue, there are several possible solutions available. However, in the context of this particular situation, I believe creating a custom validator would be the most effective choice. An example implementation could look something like the following:
// Implementation of Custom Validator
// This section is typically uncommented in the full application
// import { FormControl } from '@angular/forms';
// Placeholder values for demonstration - actual input should come from form
const validInput = { value: '123123' };
const invalidLowValue = { value: '123' };
const invalidHighValue = { value: '123123123123' };
const invalidNoValue = { value: '' };
// The following function needs to be exported without 'export' keyword for snippet compatibility
function validateOptionalFieldWithLength(input){
return validateField(input, { validField: true });
}
// This section is typically uncommented in the full application
// function validateField(input: FormControl, error: { [errorKey: string]: boolean }) {
function validateField(input, error) {
let isValidField = true;
let fieldValue = input.value;
if (fieldValue && fieldValue.length === 6 ) {
return null;
}
return error;
}
console.log('Expecting valid result (null): ' + validateOptionalFieldWithLength(validInput));
console.log('Expecting validation error: ' + validateOptionalFieldWithLength(invalidLowValue));
console.log('Expecting validation error: ' + validateOptionalFieldWithLength(invalidHighValue));
console.log('Expecting validation error: ' + validateOptionalFieldWithLength(invalidNoValue));// Your Component
// Import your custom validator
idAnnuaire: new FormControl('',
Validators.compose([
validateOptionalFieldWithLength
])
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