Open JounQin opened 2 years ago
FormControl
FormGroup
Validator
control.setErrors()
示例代码:
export const domainValidator = (group: FormGroup) => { const prefixCtrl = group.get('prefix') const prefix: string = prefixCtrl.value const suffix: string = group.get('suffix').value const isPrefixValid = prefix.length + (suffix.length - +suffix.startsWith('*')) <= 20 prefixCtrl.setErrors(isPrefixValid ? null : { maxlength: true }) } export class TestComponent { form = this.fb.group( { prefix: '', suffix: '' }, { validators: domainValidator }, ) }
FormControl
如果需要与其他FormControl
联动检查时,应该在向上一级的FormGroup
中设置相关Validator
并在其中调用control.setErrors()
来设置校验结果,这样可以保证多个FormControl
变动时只需要进行一次校验。示例代码: