tracman-server/static/js/contact.js

'use strict'
/* global $ */

let validEmail, validMessage

// Validate email addresses
function validateEmail (email) {
  const re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
  return re.test(email)
}

// Validate form
function validateForm (input) {
  // Check if email is valid
  if (input === 'email') {
    if (!validateEmail($('#email-input').val())) {
      validEmail = false
      $('#email-help').show()
      $('#submit-button').prop('disabled', true).prop('title', 'You need to enter a valid email address. ')
    } else {
      validEmail = true
      $('#email-help').hide()
      validateForm()
    }
  }

  // Ensure message has been entered
  if (input === 'message') {
    if ($('#message-input').val() === '') {
      validMessage = false
      $('#message-help').show()
      $('#submit-button').prop('disabled', true).prop('title', 'You need to enter a message. ')
    } else {
      validMessage = true
      $('#message-help').hide()
      validateForm()
    }

  // Recheck whole form
  } else {
    if (validEmail && validMessage) {
      $('#submit-button').prop('disabled', false).prop('title', 'Click here to send your message. ')
      return true
    } else {
      $('#submit-button').prop('disabled', true).prop('title', 'Edit the form before clicking send. ')
      return false
    }
  }
}

// Initial check
$(function () {
  if (validateEmail($('#email-input').val())) validEmail = true
  else validEmail = false

  if (!$('#message-input').val() === '')validMessage = true
  else validMessage = false

  // Use a one-second timout because reCaptcha re-enables the button by default
  setTimeout(validateForm, 1000)
})

// Submit form (reCaptcha callback)
window.onSubmit = function () {
  if (validateForm()) $('#contact-form').submit()
}

// Form change listener
$('#email-input').change(function () {
  validateForm('email')
})
$('#message-input').change(function () {
  validateForm('message')
})