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# Requires Input behavior
#
# When called on a form with input fields with the `required` attribute, the
# form's submit button will be disabled until all required fields have values.
#
#= require extensions/jquery
#
# ### Example Markup
#
# <form class="js-requires-input">
# <input type="text" required="required">
# <input type="submit" value="Submit">
# </form>
#
$.fn.requiresInput = ->
$form = $(this)
$button = $('button[type=submit], input[type=submit]', $form)
required = '[required=required]'
fieldSelector = "input#{required}, select#{required}, textarea#{required}"
requireInput = ->
# Collect the input values of *all* required fields
values = _.map $(fieldSelector, $form), (field) -> field.value
# Disable the button if any required fields are empty
if values.length && _.any(values, _.isEmpty)
$button.disable()
else
$button.enable()
# Set initial button state
requireInput()
$form.on 'change input', fieldSelector, requireInput
$ ->
$('form.js-requires-input').requiresInput()
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