Masatoshi Nishiguchi
Software Engineer

Rails 5 - flash message using iziToast

rails rails iziToast

This is my note on how to set up iziToast in rails 5.2 app.

system used

get started

install iziToast

yarn add izitoast --save

configure webpacker for iziToast

// app/javascript/packs/application.js

import iziToast from 'izitoast/dist/js/iziToast';

// expose to window
window.iziToast = iziToast;
// app/javascript/packs/stylesheet.scss

@import "~izitoast/dist/css/iziToast";

define flash_tag view helper

# app/helpers/application_helper.rb

module ApplicationHelper
  def flash_tag
    messages = []

    flash.each do |type, message|
      next if message.blank?

      level = case type
              when "notice" then "success"
              when "alert"  then "error"
              when "info"   then "info"
              when "warn"   then "warn"
              else
                "info"
              end

      js = %[iziToast.#{level}({ title: '#{level.capitalize}:', message: "#{message}" });]
      messages << javascript_tag(js)
    end

    messages.join("/n").html_safe
  end
end

call flash_tag in layouts/application

/ app/views/layouts/application.slim

doctype html
html
  head
    title My App
    = csrf_meta_tags
    = csp_meta_tag
    = stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload'
    = javascript_include_tag 'application', 'data-turbolinks-track': 'reload'
    = javascript_pack_tag 'application'
    = stylesheet_pack_tag 'stylesheet'
    = render "layouts/tracking_script"
  body
    = render "layouts/header"
    main[style="min-height:80vh"]
      = flash_tag
      = yield
    = render "layouts/footer"