Mithril.js Tutorial Part 2

Coupon.js

window.Coupon = {}

Coupon.controller = function (attrs) {
  var ctrl = this
  ctrl.code = ""

  ctrl.submit = function (e) {
    e.preventDefault()
    ctrl.error = null

    validateCoupon(ctrl.code)
      .then(function(discount) {
        alert('Coupon applied!')
        ctrl.code = ""
        attrs.onSuccess(discount)
      })
      .then(null, function(err) {
        ctrl.error = err
      })
  }
}

Coupon.view = function (ctrl) {
  return m('form', { onsubmit: ctrl.submit }, [

    ctrl.error ? [
      m('.error', "Invalid coupon.")
    ] : null,

    m('label', "Enter coupon (if you have one):"),
    m('input[type=text]', {
      value: ctrl.code,
      onchange: function(e) {
        ctrl.code = e.currentTarget.value
      }
    }),
    m('button[type=submit]', "Validate coupon")
  ])
}

function validateCoupon (code) {
  var isValid = (code === 'happy')
  var discount = 0.20
  // Mock AJAX promise
  var deferred = m.deferred()
  if (isValid) { deferred.resolve(discount) }
  else         { deferred.reject('invalid_code') }
  return deferred.promise
}

Entry.js

  window.Entry = {}

  var store = []
  var idCounter = 1

  Entry.all = function () {
    return store
  }

  Entry.create = function (attrs) {
    attrs.id = (idCounter += 1)
    store.push(attrs)
    return attrs
  }

  Entry.vm = function () {
    return {
      enteredAt: null,
      volunteers: [ Entry.volunteerVM() ]
    }
  }

  Entry.volunteerVM = function () {
    return {
      name: '[Your name]',
      email: '[Your email]'
    }
  }

EntryForm.js

window.EntryForm = {}

EntryForm.controller = function () {
  var ctrl = this
  ctrl.entry = Entry.vm()
  ctrl.discount = 0

  ctrl.submit = function () {
    Entry.create( ctrl.entry )
    m.route('/')
  }
}

EntryForm.view = function (ctrl) {
  return m('.entry-form', [
    m('h1', "Entry Form"),
    m('h3', "Please enter each volunteer's contact information:"),

    m.component(Volunteers, { volunteers: ctrl.entry.volunteers }),

    m.component(Total, { /*2*/
      count: ctrl.entry.volunteers.length,
      discount: ctrl.discount
    }),

    m.component(Coupon, {
      onSuccess: function(newDiscount) {
        ctrl.discount = newDiscount
      }
    }),

    m('button', { onclick: ctrl.submit }, 'Submit')
  ])
}

EntryList.js

window.EntryList = {}

EntryList.view = function () {
  return m('.entry-list', [
    m('h1', "All Entries"),
    m('a[href=/entries/new]', { config: m.route }, "Add New Entry"),
    Entry.all().map( entryView )
  ])
}

function entryView (entry) {
  var date = new Date(entry.enteredAt)

  return m('.entry', [
    m('label', "Entered at: ", date.toString()),
    m('ul', entry.volunteers.map(volunteerView) )
  ])
}

function volunteerView (volunteer) {
  return m('li.volunteer', [
    m('label', volunteer.name),
    m('label', "(" + volunteer.email + ")")
  ])
}

index.html

<div id="app"></div>

<script>
  // Seed some data
  Entry.create({
    "enteredAt": 1443018758199,
    "volunteers": [
      { name: "Alice", email: "alice@example.com" },
      { name: "Bob", email: "bob@example.com" }
    ]
  })

  Entry.create({
    "enteredAt": 1443019047227,
    "volunteers": [
      { name: "Carl", email: "carl@example.com" },
      { name: "Dan", email: "dan@example.com" },
      { name: "Erl", email: "erl@example.com" },
    ]
  })

  // Put the component on the page
  m.route(document.getElementById('app'), '/', {
    '/': EntryList,
    '/entries/new': EntryForm
  })
</script>

Total.js

window.Total = {}

/* Model-level logic */
Total.pricePerCount = 10
Total.calcPrice = function (discount, count) {
  var total = count * Total.pricePerCount
  return roundCents(total - total * discount)
}
Total.calcDiscount = function (discount, count) {
  var total = count * Total.pricePerCount
  return roundCents(total * discount)
}

/* View */
Total.view = function (ctrl, attrs) {
  return m('.total', [
    m('label', "Total: "),
    discountView(ctrl, attrs),
    m('b', "$" + Total.calcPrice(attrs.discount, attrs.count))
  ])
}

/* Helpers */
function discountView (ctrl, attrs) {
  if (attrs.discount > 0) {
    var discountedAmount =
      Total.calcDiscount(attrs.discount, attrs.count)
    return m('span', "(Coupon discount: -$" + discountedAmount + ")")
  }
}
function roundCents (num) {
  return Math.round(num * 100) / 100
}

Volunteers.js

window.Volunteers = {}

Volunteers.controller = function (attrs) {
  var ctrl = this

  ctrl.add = function () {
    attrs.volunteers.push( Entry.volunteerVM() )
  }
  ctrl.remove = function (idx) {
    attrs.volunteers.splice(idx, 1)
  }
}

Volunteers.view = function (ctrl, attrs) {
  return m('.volunteers', [

    attrs.volunteers.map(function(volunteer, idx) {
      return m('fieldset', [
        m('legend', "Volunteer #" + (idx+1)),

        m('label', "Name:"),
        m('input[type=text]', {
          value: volunteer.name,
          onchange: function(e) {
            volunteer.name = e.currentTarget.value
          }
        }),
        m('br'),

        m('label', "Email:"),
        m('input[type=text]', {
          value: volunteer.email,
          onchange: function(e) {
            volunteer.email = e.currentTarget.value
          }
        }),
        removeAnchor(ctrl, attrs, idx)
      ])
    }),

    m('button', { onclick: ctrl.add }, 'Add another volunteer'),
  ])
}

function removeAnchor (ctrl, attrs, idx) {
  if (attrs.volunteers.length >= 2) {
    return m('button', { onclick: ctrl.remove.papp(idx) }, 'remove')
  }
}