Documentation

A structure holding a list of options. Typically you can use a convenience function like mkOptionList or optionsPairs instead of creating this directly.

A newtype wrapper around a Text whose ToMarkup instance converts newlines to HTML <br> tags.

(When text is entered into a <textarea>, newline characters are used to separate lines. If this text is then placed verbatim into HTML, the lines won't be separated, thus the need for replacing with <br> tags). If you don't need this functionality, simply use unTextarea to access the raw text.

Creates a input with type="number" and step=1.

Creates a input with type="number" and step=any.

Creates an input with type="date", validating the input using the parseDate function.

Add the time package and import the Data.Time.Calendar module to use this function.

An alias for timeFieldTypeTime.

Creates an input with type="time". Browsers not supporting this type will fallback to a text field, and Yesod will parse the time as described in timeFieldTypeText.

Add the time package and import the Data.Time.LocalTime module to use this function.

Since 1.4.2

Creates an input with type="text", parsing the time from an [H]H:MM[:SS] format, with an optional AM or PM (if not given, AM is assumed for compatibility with the 24 hour clock system).

This function exists for backwards compatibility with the old implementation of timeField, which used to use type="text". Consider using timeField or timeFieldTypeTime for improved UX and validation from the browser.

Add the time package and import the Data.Time.LocalTime module to use this function.

Since 1.4.2

Creates a <textarea> tag whose input is sanitized to prevent XSS attacks and is validated for having balanced tags.

Creates a <textarea> tag whose returned value is wrapped in a Textarea; see Textarea for details.

Creates an input with type="hidden"; you can use this to store information in a form that users shouldn't see (for example, Yesod stores CSRF tokens in a hidden field).

Creates a input with type="text".

Creates an input with type="password".

Parses a Day from a String.

Creates an input with type="email". Yesod will validate the email's correctness according to RFC5322 and canonicalize it by removing comments and whitespace (see Text.Email.Validate).

Creates an input with type="email" with the multiple attribute; browsers might implement this as taking a comma separated list of emails. Each email address is validated as described in emailField.

Since 1.3.7

Creates an input with type="search". For browsers without autofocus support, a JS fallback is used if AutoFocus is true.

Creates an input with type="url", validating the URL according to RFC3986.

Creates a <select> tag for selecting one option. Example usage:

areq (selectFieldList [("Value 1" :: Text, "value1"),("Value 2", "value2")]) "Which value?" Nothing

Creates a <select> tag for selecting one option. Example usage:

areq (selectField $ optionsPairs [(MsgValue1, "value1"),(MsgValue2, "value2")]) "Which value?" Nothing

Creates a <select> tag for selecting multiple options.

Creates a <select> tag for selecting multiple options.

Creates an input with type="radio" for selecting one option.

Creates an input with type="checkbox" for selecting multiple options.

Creates an input with type="checkbox" for selecting multiple options.

Creates an input with type="radio" for selecting one option.

Creates a group of radio buttons to answer the question given in the message. Radio buttons are used to allow differentiating between an empty response (Nothing) and a no response (Just False). Consider using the simpler checkBoxField if you don't need to make this distinction.

If this field is optional, the first radio button is labeled "<None>", the second "Yes" and the third "No".

If this field is required, the first radio button is labeled "Yes" and the second "No".

(Exact label titles will depend on localization).

Creates an input with type="checkbox". While the default boolField implements a radio button so you can differentiate between an empty response (Nothing) and a no response (Just False), this simpler checkbox field returns an empty response as Just False.

Note that this makes the field always optional.

Creates an OptionList, using a Map to implement the olReadExternal function.

Creates an OptionList from a list of (display-value, internal value) pairs.

Creates an OptionList from an Enum, using its Show instance for the user-facing value.

Selects a list of Entitys with the given Filter and SelectOpts. The (a -> msg) function is then used to derive the display value for an OptionList. Example usage:

Country
   name Text
   deriving Eq -- Must derive Eq

data CountryForm = CountryForm
  { country :: Entity Country
  }

countryNameForm :: AForm Handler CountryForm
countryNameForm = CountryForm
        <$> areq (selectField countries) "Which country do you live in?" Nothing
        where
          countries = optionsPersist [] [Asc CountryName] countryName

An alternative to optionsPersist which returns just the Key instead of the entire Entity.

Since 1.3.2

Creates an input with type="file".