我正在尝试使用自定义验证来验证表单。出于某种原因,我必须构建一个可以更改电子邮件或设置新密码的表单。出于这个原因,我不能使用 Validators.required,因为密码字段只有在被触摸时才会变成必需的。
我的问题是,当输入验证解决后,表单仍然无效。
我做了一个 plnkr 来演示我的问题:
http://plnkr.co/edit/obF4gC5RHkXOOlCEsIuH?p=preview
ngOnInit(): void {
this.emailField = new FormControl('mail@mail.com', Validators.email);
this.pw1 = new FormControl('', [this.passwordAreEqualValidator, Validators.minLength(2)]);
this.pw2 = new FormControl('', this.passwordAreEqualValidator);
this.pwOld = new FormControl('', this.notEmptyIfNewIsTouchedValidator);
this.form = this.formBuilder.group({
pw1: this.pw1,
pw2: this.pw2,
emailField: this.emailField,
pwOld: this.pwOld
});
}
notEmptyIfNewIsTouchedValidator(control: FormControl) : ValidationErrors | null {
if (control.dirty) {
if (control.value === '') {
return {
oldPasswordEmpty: true
}
}
const parent = control.parent,
pw1 = parent.get('pw1'),
pw2 = parent.get('pw2');
// this will trigger nothing in template, this part is only
// to mark form invalid if password was entered. passwordNew1
// cannot be false by default as this is okay when you only
// want to change your e-mail adress.
if (pw1.value.length === 0) {
pw1.setErrors({noPassword: true});
} else {
if (pw1.hasError('noPassword')) {
let pw1Errors = pw1.errors;
delete pw1Errors.noPassword;
pw1.setErrors(pw1Errors);
}
}
console.log('pw1 errors: ', pw1.errors);
console.log('pw2 errors: ', pw2.errors);
console.log('old errors: ', control.errors);
}
return null;
}
passwordAreEqualValidator(control: FormControl): ValidationErrors | null {
if (control.dirty) {
const
parent = control.parent,
pwOld = parent.get('pwOld'),
pw1 = parent.get('pw1'),
pw2 = parent.get('pw2');
if (pwOld.value === '') {
pwOld.setErrors({oldPasswordEmpty: true})
}
if (pw1.value !== pw2.value) {
return {
notEqual: true
};
} else {
let pw1Errors = pw1.errors;
if (pw1.hasError('notEqual')) {
delete pw1Errors.notEqual;
pw1.setErrors(pw1Errors);
}
if (pw1.hasError('noPassword')) {
delete pw1Errors.noPassword;
pw1.setErrors(pw1Errors);
}
pw2.setErrors(null);
console.log('pw1 errors: ', pw1.errors);
console.log('pw2 errors: ', pw2.errors);
console.log('old errors: ', pwOld.errors);
}
}
return null;
}
重现步骤:
- 输入密码(出现错误旧密码为空)
- 重复密码(错误密码不相等,直到两个密码匹配为止)
- 一旦您的重复密码匹配,为旧密码添加一个值(错误的旧密码被删除)
- 所有验证错误都已删除,但表单仍然无效。
为什么我的表单无效?
P.S:一旦我再次编辑我的 pw1,我的表单就有效了,尽管错误的结果没有改变。
最佳答案
您在两个字段上都设置了验证器.....发生的情况是当您输入 pw2 时 pw1 不会重新生效,因此 pw1 仍然无效,直到您返回并再次输入它。
在您的组件中,在 ngOnInit 的末尾,您可以添加以下内容....
this.pw1.valueChanges().subscribe(() => this.pw2.updateValueAndValidity());
this.pw2.valueChanges().subscribe(() => this.pw1.updateValueAndValidity());
关于 Angular 4 : Form invalid despite no errors in fields (using custom validation),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47672909/