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Flash Messages

5:29 with Alena Holligan and Brian Retterer

As a little bonus, let’s add some nice messages in the session flashes to give feedback to the user.

Styles for New Function display_success()

Name of bag: success

Name of class: alert-success

$messages = $session->getFlashBag()->get('success');
$response = '<div class="alert alert-success alert-dismissable">';
Success and Failure Flash Messages
  • Adding Book
  • Editing Book
  • Logging In
  • Logging Out
  • Registration
Display Flash Messages on Pages
  • add.php
  • books.php
  • edit.php
  • index.php
  • login.php

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    Up until now when there's been an error, 0:00
    we just redirect the user back to a form or page that they were just on. 0:03
    But we do not provide any information. 0:07
    I think we should fix this and show some sort of message. 0:10
    When a message is only visible for 0:15
    a single request, this is called a flash message. 0:17
    The Symfony HttpFoundation package that we've been using 0:21
    gives us a nice set of features to do this. 0:25
    We'll be using Sessions for this, and attaching a message to its flashBag, 0:28
    the storage area for all these messages. 0:32
    The messages that are stored here are automatically deleted 0:36
    when you retrieve them to display on the site. 0:40
    The first thing we need to do 0:43
    is open our Bootstrap file and 0:48
    begin a session for our application. 0:53
    This will create a new session object and start it. 1:11
    This is essentially the same thing as doing session_start. 1:15
    That gives us a lot more features to work with. 1:19
    To show how this works, let's take a look at our login system. 1:22
    Open the do login procedure and let's add some items to our session. 1:26
    If a user's email is not found, we should let them know that the username was not 1:32
    found when we send them back to the login page. 1:37
    We need to add a line to this check for the empty username. 1:40
    From the session object in the Bootstrap file, we get the FlashBag and 1:48
    can add to it. 1:53
    The first item is the key we want to use, in this case, error. 2:00
    And the second is the message, Username was not found. 2:06
    Internally, it will create an error array 2:17
    with all the messages that belong to that key. 2:20
    To display the message, we need to check for anything in the error FlashBag. 2:24
    I think this calls for a nice helper function. 2:29
    We'll call this display_errors. 2:38
    And first we'll need to get the global session variable. 2:46
    After that, 2:56
    we check to see 3:01
    if the FlashBag 3:06
    has an error. 3:11
    If not, we can return. 3:16
    If so, 3:21
    we need to get 3:24
    the errors. 3:29
    Now we can create an alert with all the error messages. 3:38
    Let's loop over 4:14
    our messages. 4:21
    And finally, return the response. 4:38
    Now we need to display errors on our login page. 4:45
    Let's take a look at this in the browser. 4:59
    If any errors exist, they will now show here. 5:09
    We can expand this to show success messages and other kinds of messages. 5:13
    Why don't you give it a shot and add the function to display success and 5:18
    add these messages where you find appropriate? 5:22
    Check the notes associated with this video for style examples. 5:25

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