Class to manage dynamic forms with coffeescript

form.coffee

class Form
    ###
    Class to manage dynamic forms with javascript

    > var form = Form('/destiny/path/', {'username':'fmartingr'})
    > form.addField('password', 'aw8cnwn8t7x9my898wyf9mw67n')
    > form.submit()
    ###

    constructor: (action, params={}, method='post') ->
        @form = document.createElement 'form'

        @form.setAttribute 'method', method
        @form.setAttribute 'action', action

        for key in params
            if params.hasOwnProperty key
                @addField key, params[key]

    addField: (key, value) ->
        field = document.createElement 'input'
        field.setAttribute 'type', 'hidden'
        field.setAttribute 'name', key
        field.setAttribute 'value', value

        @form.appendChild field

    submit: ->
        document.body.appendChild @form  # Not sure if neccesary
        @form.submit()