ez-flash

An easy flash message middleware for Express.js 4.x

Table of Content

• Usage
• How it works
• Test
• Special thanks

Usage

Install

$ npm install ez-flash

Use

see example folder for a complete example with express.js

Setup

example/index.js

var express = require('express');
var bodyParser = require('body-parser');
var session = require('express-session');
var flash = require('ez-flash');
var app = express();
 
app.use(bodyParser.urlencoded({ extended: false }));
app.use(session({ secret: 'my secret', resave: false, saveUninitialized: true }));
app.use(flash.middleware);

Basic Usage

flash a message

example/index.js

app.post('/singleMsg', function (req, res) {
  flash.flash('message', req.body.message);
  res.redirect('/');
});

re-flash after more than one redirect

example/index.js

app.get('/', function (req, res) {
  flash.reFlashAll();
  res.redirect('/singleMsg');
});

show the flash message

example/view/includes/flash.pug

each content, type in flash
    h2 flash message: #{content}

Combining Bootstrap Alert

flash multiple messages

example/index.js

app.post('/multipleMsg', function (req, res) {
  var msgTypes = ['success', 'info', 'warning', 'danger'];
  for (var i = 0; i < msgTypes.length; ++i) {
    if (req.body[msgTypes[i]]) {
      flash.flash(msgTypes[i], req.body[msgTypes[i]]);
    }
  }
  res.redirect('/multipleMsg');
})

render

example/flash.pug

each content, type in flash
    if type === 'success' || type === 'info' || type === 'warning' || type === 'danger'
        div(class="alert alert-" + type)= content

How it works

flash(type, message)

Init session.flash if needed, then save the flash message to it.

middleware()

Move the flash message from locals to session so we can access the flash message in the view with flash object.

reFlashAll(cleanUp = false)

Copy the flash message from locals to session, making the flash message available for the next response. The message in locals will be deleted (not shown this time) if cleaUp = true.

Tests

$ tsc
$ tsc test/test.ts
$ npm test

Special thanks

Laravel flash data for the desired function and syntax.

tsmean for how to write the package.

express/flash for how to write the test code.