field_validation: Field Validation for Fomantic UI
In fomantic.plus: Add Extra 'Fomantic UI' Components to 'shiny.semantic'

Description Usage Arguments Details Value References See Also Examples

A field validation assigns a series of rules that have been assigned to a particular input and checks, upon the form submission, whether or not the input meets all specified criteria.

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field_validation(id, ..., extra_params = NULL)

field_rule(rule, prompt = NULL, value = NULL)

`id`	HTML id of the field to be validated
`...`	A series of `field_rule`s that will be applied to the field
`extra_params`	A named list of extra parameters that can be added to the field validation. For example `optional = TRUE` means the field will only be checked if non-empty
`rule`	The type of rule to be applied. Valid rules are available in Details.
`prompt`	Text to be displayed in the UI if the validation fails. Leave `NULL` if want to use default text.
`value`	Certain fields require a value to check validation. Check Details if the `rule` requires a value.

If it fails, then the field will be highlighted and the failures will either be specified as a message below the field or a label. Once the failure(s) has been rectified, the highlighting will disappear.

The following rules are allowed:

empty: A field is not empty
checked: A checkbox field is checked
email: A field is a valid e-mail address
url: A field is a url
integer: A field is an integer value or matches an integer range*
decimal: A field must be a decimal number or matches a decimal range*
number: A field is any number or matches a number range*
regExp: Matches against a regular expression
creditCard: A field is a valid credit card**
contains, doesntContain: A field (doesn't) contain text (case insensitive)
containsExactly, doesntContainExactly: A field (doesn't) contain text (case sensitive)
is, not: A field is (not) a value (case insensitive)
isExactly, notExactly: A field is (not) a value (case sensitive)
minLength, exactLength, maxLength: A field is at least/exactly/at most a set length
match, different: A field should (not) match the value of another validation field. Use the field ID as the value
minCount, exactCount, maxCount: A multiple select field contains at least/exactly/at most a set number of selections

* For ranges, include the parameter value = "x..y" where x is the minimum value and y is the maximum value. Leave either side blank to not have a lower/upper limit

** Include comma separated string of card providers if required e.g. value = "visa,mastercard"

A structured list of the field_rules that can be recognised by form_validation.

https://fomantic-ui.com/behaviors/form.html

form_validation

# E-mail validations
field_validation("email", field_rule("email"))

# Password validation
field_validation(
  "password",
  field_rule("empty"),
  field_rule("minLength", value = 8),
  field_rule("regExp", "Must contain at least one special character", "\\W")
)