LibVerify

HMOS library designed for rapid and customizable form validation.

Usage

You can use LibVerify with any Component that extends the original [TextField].

With XML

You just have to wrap your TextField with an InputValidator view. Example for an email and a custom regex :

<com.applib.libverify.InputValidator
    ohos:width="wrap_content"
    ohos:height="wrap_content"
    app:required="true"
    app:validator="isEmail"
    app:requiredMessage="Email required">

    <TextField
        ohos:width="match_parent"
        ohos:height="match_content"
        ohos:inputType="textEmailAddress"
        ohos:hint="Email"/>

</com.applib.libverify.InputValidator>
            
<com.applib.libverify.InputValidator
    ohos:width="match_content"
    ohos:height="match_content"
    app:regex="^[0-9]{4}$"
    app:errorMessage="4 digits only">

    <TextField
        ohos:width="match_content"
        ohos:height="match_content"
        ohos:hint="Regex 4 digits (custom error msg)"/>

</com.applib.libverify.InputValidator>            

Note: Be sure to add xmlns:app="http://schemas.huawei.com/hap/res-auto" next to xmlns:ohos for custom attributes to work.

InputValidator can be set to recognize email, phone, IP address, URL or number using validator attribute.
If you don't specify an errorMessage or a requiredMessage, predefined messages will be shown if the field is not valid.

Then validate your form :

// Initiate using context and a ComponentContainer that holds the InputValidators
// This example assumes a DirectionalLayout that contains the InputValidators

DirectionalLayout mComponentContainer = 
	(DirectionalLayout) findComponentById(ResourceTable.Id_form);

Form form = new Form.Builder(this, mComponentContainer)
    .showErrors(true)
    .build();

// validate the form
if(form.isValid()) {
    // the form is valid
}
else {
    // the form is not valid
}        

With Java

You can create programmatically InputValidator without passing by XML (see all Builder methods) :

// create the validator with the Builder
// emailTextField is the TextField to validate 
// 'this' represents a Context
InputValidator emailValidator = new InputValidator.Builder(this)
    .on(emailTextField)
    .required(true)
    .validatorType(InputValidator.IS_EMAIL)
    .build();
                
// create the form and add the validator
Form form = new Form.Builder(this)
    .addInputValidator(emailValidator)
    .build();
    
// validate the form
if(form.isValid()) {
    // the form is valid
}
else {
    // the form is not valid
}

You can create programmatically without using the Builders, but it is safer and quicker to use Builders.

Attributes

InputValidator

All the attributes that can be used with InputValidator . They can be used in XML or in Java with setters :

Attribute	Type	Description
app:required	boolean	Whether the field is required or not
app:validator	enum	Use a validator type predefined by FormValidator. You can use isEmail, isPhoneNumber, isNumeric, isUrl or isIP
app:minLength	int	The minimum length of the field
app:maxLength	int	The maximum length of the field
app:minValue	int	The minimum value of the field (must be numeric)
app:maxValue	int	The maximum value of the field (must be numeric)
app:regex	string	Use a regex to validate a field
app:identicalAs	reference id	The id of an TextField to which the field must be equal
app:errorMessage	string	The message to display if the field is not valid
app:requiredMessage	string	The message to display if the field is empty but was required. It implies that the field is required

Form

All the attributes that can be used with Form. They can be used in XML or in Java with setters :

Attribute	Type	Default	Description
app:showErrors	boolean	true	Whether the errors must be shown on each TextField or not

Advanced Usage

Use a custom validator

You can use a custom validator for an InputValidator :

// the InputValidator was present in the XML layout
InputValidator mInputValidator = (InputValidator) findComponentById(ResourceTable.Id_input_validator);
// your custom validator must extends AbstractValidator class
mInputValidator.setCustomValidator(new AbstractValidator() {
    @Override
    public boolean isValid(String value) {
        return value.equals("ok man");
    }
              
    @Override
    public String getErrorMessage() {
        return "This field must be equals to 'ok man'";
    }
});


// or create your InputValidator with the Builder
InputValidator inputValidator = new InputValidator.Builder(this)
    .on(aTextField)
    .customValidator(new AbstractValidator() {
        @Override
        public boolean isValid(String value) {
            return value.equals("ok man");
        }
                  
        @Override
        public String getErrorMessage() {
            return "This field must be equals to 'ok man'";
        }
    });
    .build();

Use the Form component in XML

If you want, you can use a Form component directly in XML. This view extends DirectionalLayout. It must wrap all the fields you want to check.

It can be useful for these reasons :

• You don't have to instantiate a Form object before validate the form
• It will be easier to identify a form in your XML layout
• You can use two different and independent forms in the same XML layout

XML

<!-- form1 -->
<com.applib.libverify.Form
	ohos:id="$+id:form1"
	ohos:orientation="vertical"
	ohos:width="match_parent"
	ohos:height="match_content"
	ohos:padding="16fp">

	<!-- email -->
	<com.applib.libverify.InputValidator
		ohos:width="match_content"
		ohos:height="match_content">

		<TextField
			ohos:width="match_parent"
			ohos:height="match_content"
			ohos:text_size="20fp"
			ohos:hint="Email"/>

	</com.applib.libverify.InputValidator>

	<!-- password -->
	<com.applib.libverify.InputValidator
		ohos:width="match_content"
		ohos:height="match_content"
		app:required="true"
		app:minLength="6">

		<TextField
			ohos:width="match_parent"
			ohos:height="match_content"
			ohos:text_input_type="pattern_password"
			ohos:text_size="20fp"
			ohos:hint="Password (6 char. min) *" />

	</com.applib.libverify.InputValidator>

	<!-- submit form -->
	<Button
		ohos:id="$+id:validate_form1"
		ohos:width="match_content"
		ohos:height="match_content"
		ohos:text_size="20fp"
		ohos:text="Validate form1"/>

</com.applib.libverify.Form>
<!-- /form1 -->

<!-- form2 -->
<com.applib.libverify.Form
	ohos:id="$+id:form2"
	ohos:orientation="vertical"
	ohos:width="match_parent"
	ohos:height="match_content"
	ohos:below="$+id:form1"
	ohos:padding="16fp">

	<!-- phone number -->
	<com.applib.libverify.InputValidator
		ohos:id="$+id:tiv1"
		ohos:width="match_content"
		ohos:height="match_content"
		app:required="true">

		<TextField
			ohos:width="match_parent"
			ohos:height="match_content"
			ohos:text_input_type="pattern_number"
			ohos:text_size="20fp"
			ohos:hint="Phone number *"/>

	</com.applib.libverify.InputValidator>

	<!-- age -->
	<com.applib.libverify.InputValidator
		ohos:width="match_content"
		ohos:height="match_content"
		app:minValue="12">

		<TextField
			ohos:width="match_parent"
			ohos:height="match_content"
			ohos:text_input_type="pattern_number"
			ohos:text_size="20fp"
			ohos:hint="Age (12 min)" />

	</com.applib.libverify.InputValidator>

	<!-- submit form -->
	<Button
		ohos:id="$+id:validate_form2"
		ohos:width="match_content"
		ohos:height="match_content"
		ohos:text_size="20fp"
		ohos:text="Validate form2"/>

</com.applib.libverify.Form>
<!-- /form2 -->

Validate the forms

// get the forms
// you don't have to instantiate them because they already know the fields they have to validate
Form form1 = (Form) findComponentById(ResourceTable.Id_form1);
Form form2 = (Form) findComponentById(ResourceTable.Id_form2);

// validate form1
if(form1.isValid()) {
    // form1 is valid
}

// validate form2
if(form2.isValid()) {
    // form2 is valid
}

Builders method

It is recommended to use the builders to create Form and InputValidator views programmatically in order to prevent some errors. All the attributes for the two views are supported by the builders.

InputValidator builder

InputValidator inputValidator = new InputValidator.Builder(this)
    // methods
    .build();

Method	Return value	Description
InputValidator.Builder(Context context)	InputValidator.Builder	The constructor of the builder
on(TextField textField)	InputValidator.Builder	The TextField to validate
required(boolean required)	InputValidator.Builder	Whether the field is required or not
validatorType(int type)	InputValidator.Builder	Use a validator type predefined by FormValidator. You can use InputValidator.IS_EMAIL, InputValidator.IS_PHONE_NUMBER, InputValidator.IS_NUMERIC, InputValidator.IS_URL or InputValidator.IS_IP
customValidator(AbstractValidator validator)	InputValidator.Builder	Use a custom validator
minLength(int length)	InputValidator.Builder	The minimum length of the field
maxLength(int length)	InputValidator.Builder	The maximum length of the field
minValue(int value)	InputValidator.Builder	The minimum value of the field (must be numeric)
maxValue(int value)	InputValidator.Builder	The maximum value of the field (must be numeric)
regex(String regex)	InputValidator.Builder	Use a regex to validate a field
identicalAs(int id)	InputValidator.Builder	The id of an TextField to which the field must be equal
identicalAs(TextField textField	InputValidator.Builder	An other TextField to which the field must be equal
errorMessage(String message)	InputValidator.Builder	The message to display if the field is not valid
requiredMessage(String message)	InputValidator.Builder	The message to display if the field is empty but was required
build()	InputValidator	Create the InputValidator object

Form builder

Form form = new Form.Builder(this)
    // methods
    .build();

Method	Return value	Description
Form.Builder**(Context context, Component rootView)	Form.Builder	Constructor of the builder
addInputValidator(InputValidator validator)	Form.Builder	Add an InputValidator
showErrors(boolean show)	Form.Builder	Whether the errors must be shown on each TextField or not
build()	Form	Create the Form object

Sample

A sample app with some use cases of the library is available on this link

Credits

• AndroidVerify