Class representing a Validator.

Validators are used to validate input fields in a ShinyForm. Validators are to be used with the validatedInput function. A single input field can have several validators.

Details

Package shinyreformss defines a set of commonly used pre-defined Validators. These include:

ValidatorMinLength(minLength):

Will fail if string is shorter than minLength.

ValidatorMaxLength(maxLength):

Will fail if string is longer than maxLength.

ValidatorNonEmpty():

Will fail if string is empty.

Public fields

test

Function returning a boolean value which will be used to validate input.

failMessage

Error message to display when validation fails.

Methods

Public methods

• Validator$new()

• Validator$check()

• Validator$clone()

---

Method new()

Creates a Validator object.

Usage

Validator$new(test, failMessage)

Arguments

test

A function to test the input. Should take a single value as input and return a boolean.

failMessage

A fail message to be displayed.

---

Method check()

Performs a check on the input.

Usage

Validator$check(value)

Arguments

value

Input value to be tested.

Returns

TRUE if the check passes, FALSE if otherwise.

---

Method clone()

The objects of this class are cloneable with this method.

Usage

Validator$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

if(interactive()){
Validator(function(value) {
  ...
}, "Validation failed!")
}