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