stream_fluent_validation

Description:

stream fluent validation

Stream Fluent Validation #
Stream Fluent Validation is a validation library for Flutter developer . It supports text validation for String, EditText, TextView, AutoCompleteTextView, TextInputLayout, and Spinner. It comes with lots of built-in rules for validation such as email, special character validations and so on.
Quick Stream Fluent Validation #
For example, you can validate any Form like this:
final LoginValidation loginValidation = LoginValidation();

class LoginValidation extends AbstractValidator<LoginValidation> {
StreamValidator<String> email = StreamValidator<String>();
StreamValidator<String> password = StreamValidator<String>();

LoginValidation() {
ruleFor((e) => (e as LoginValidation).email)
.isNotEmpty()
.withMessage("email should not be empty")
.emailAddress()
.withMessage("email should be valid !!.");

ruleFor((e) => (e as LoginValidation).password).between(3, 4) .withMessage("password should contain from 3 to 4 digit !!.");
}
}

// Later on
StreamBuilder(
stream:loginValidation.email.stream,
builder: (context, snap) {
return TextField(
keyboardType: TextInputType.emailAddress,
onChanged: loginValidation.email.valueChange,
decoration: InputDecoration(
labelText: "Email address",
hintText: "[email protected]",
errorText: snap.hasError ? "${snap.error}" : null),
);
},
)

StreamBuilder(
stream: loginValidation.password.stream,
builder: (context, snap) {
return TextField(
keyboardType: TextInputType.number,
onChanged:loginValidation.password.valueChange,
obscureText: true,
decoration: InputDecoration(
labelText: "Password",
hintText: "******",
errorText: snap.hasError ? "${snap.error}" : null),
);
},
);
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Multiple Validation Checks wiht message #
Stream Fluent Validation also supports multiple validation checks like this:

class LoginValidation extends AbstractValidator<LoginValidation> {
StreamValidator<String> email = StreamValidator<String>();

LoginValidation() {
ruleFor((e) => (e as LoginValidation).email)
.isNotEmpty()
.withMessage("email should not be empty")
.emailAddress()
.withMessage("email should be valid !!.");

}
}


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Create Your Own Custom Validation Checks #
You can also add your own custom by extending use must validator rule.
ruleFor((e) => (e as LoginValidation).userName).must((Object value) {
return value.toString().isNotEmpty &&
value.toString().contains(".") &&
value.toString().length >= 3;
}).withMessage("user name is not correct");
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Built in Validators #

notEmpty - (checks the object is a String and not empty)
empty - (checks the object is a String and is empty)
notEqual - (checks if an current stream is not equal to another)
equal - (checks if an current stream is equal to another)
notEqualToConstValue - (checks if an value is not equal to another)
equalToConstValue - (checks if an value is equal to another)
length - (checks the object is a String and is between two other numbers)

Extra Built In Validators #
These are not included in the default C# version.

isValidEmailAddress - (checks the object is a String and is a valid email address)

Contributing #
Feel free to do a pull request with any ideas and I will check each one.
¬ Rad