The alerts are created by all these components you even do not think of until you really get to require them. They are used for providing fast in time comment for the user working with the website hopefully pointing his or hers focus to a specific direction or evoking special actions.
The alerts are most frequently used along with forms to give the user a tip if a field has been filled in wrongly, which is the appropriate format expected or which is the status of the submission just after the submit button has been pressed.
As the majority of the elements in the Bootstrap framework the alerts also do have a nice predefined appearance and semantic classes which are used according the particular condition where the Bootstrap Alert has been displayed on display screen. Considering that it's an alert text message it's important to obtain user's focus but after all leave him in the zone of comfort nevertheless it might even be an error report. ( get more info)
This gets accomplished by the use of gentle toned color tones each being intuitively attached to the semantic of the message material just like green for Success, Light Blue for fundamental information, Pale yellow seeking for user's focus and Mild red mentioning there is in fact something wrong.
<div class="alert alert-success" role="alert"> <strong>Well done!</strong> You successfully read this important alert message. </div> <div class="alert alert-info" role="alert"> <strong>Heads up!</strong> This alert needs your attention, but it's not super important. </div> <div class="alert alert-warning" role="alert"> <strong>Warning!</strong> Better check yourself, you're not looking too good. </div> <div class="alert alert-danger" role="alert"> <strong>Oh snap!</strong> Change a few things up and try submitting again. </div>
It really may not be spotted at a look but the font colour also is in fact following this color scheme too-- just the color options are much much darker so get intuitively takened as black but the truth is it's not exactly so.
Same goes not only for the alert text message in itself but at the same time for the links included in it-- there are link classes taking off the outline and colouring the anchor elements in the proper colour so they suit the overall alert text appearance.
<div class="alert alert-success" role="alert"> <strong>Well done!</strong> You successfully read <a href="#" class="alert-link">this important alert message</a>. </div> <div class="alert alert-info" role="alert"> <strong>Heads up!</strong> This <a href="#" class="alert-link">alert needs your attention</a>, but it's not super important. </div> <div class="alert alert-warning" role="alert"> <strong>Warning!</strong> Better check yourself, you're <a href="#" class="alert-link">not looking too good</a>. </div> <div class="alert alert-danger" role="alert"> <strong>Oh snap!</strong> <a href="#" class="alert-link">Change a few things up</a> and try submitting again. </div>
A thing to mention-- the colors offer their obvious meaning just for those who really get to check out them. It's a good thing to either make sure the visible text itself carries the meaning of the alert well enough or to eventually add some additional descriptions to only be seen by the screen readers in order to grant the page's accessibility.
In addition to links and simple HTML tags like strong as an example the alert elements in Bootstrap 4 can also include Headings and paragraphs for the situations when you would like to showcase a bit longer content ( more helpful hints).
<div class="alert alert-success" role="alert"> <h4 class="alert-heading">Well done!</h4> <p>Aww yeah, you successfully read this important alert message. This example text is going to run a bit longer so that you can see how spacing within an alert works with this kind of content.</p> <p class="mb-0">Whenever you need to, be sure to use margin utilities to keep things nice and tidy.</p> </div>
You can additionally bring in an X icon to dismiss the alert and add in a cool transition to it to one more time assure the visual comfort of the Bootstrap Alert Popup visitors.
<div class="alert alert-warning alert-dismissible fade show" role="alert"> <button type="button" class="close" data-dismiss="alert" aria-label="Close"> <span aria-hidden="true">×</span> </button> <strong>Holy guacamole!</strong> You should check in on some of those fields below. </div>
Currently there are four types of contextual alert messages in Bootstrap 4 framework - they are called Success, Info, Warning and Danger. Do not let however their names to narrow down the way you're working with them-- all of these are just some color schemes and the method they will be actually performed in your site is completely up to you and fully depends on the individual case.
-- if the color scheme of your page utilizes the red as main color it might be quite appropriate to display the alert for successful form submission in red too using the predefined alert danger appearance in order to better blend with the page and save some time defining your own classes.
After all the predefined alert classes are just some consistent looks and the responsibility for working with them lays entirely on the designer's shoulders.
Or with data attributes on a button inside the alert, as illustrated in this article
<button type="button" class="close" data-dismiss="alert" aria-label="Close"> <span aria-hidden="true">×</span> </button>
Notice that shutting an alert will remove it from the DOM.
Bootstrap's alert plugin exposes a handful of events for hooking in alert capability.