Angular Download Service

'use strict'
angular.module modulePage
.factory 'Download',
    ()->
        el = document.createElement 'a'
        el.id = 'shodow-download-anchor'
        el.style.display = 'none'
        el.target = '_blank'
        el.download = ''
        document.body.appendChild el
        (url, filename)->
            el.href = url
            if filename
                el.download = filename
            el.click()