The alerts are from all of these components you even don't remember as far as you truly get to really need them. They are put to use for giving prompt in time responses for the user interacting with the site hopefully directing his or hers attention to a specific direction or evoking certain actions.
The alerts are most frequently used together with forms to give the user a recommendation if a area has been completed improperly, which is the appropriate format expected or which is the status of the submission as soon as the submit button has been pressed.
As a lot of the elements in the Bootstrap framework the alerts also do have a nice predefined look and semantic classes that may possibly be used according to the particular case where the Bootstrap Alert has been presented on screen. Because it's an alert text message it is necessary to grab user's attention but after all leave him in the zone of comfort nevertheless it might even be an error text message. ( click this link)
This gets achieved due to the use of mild pastel color options each being intuitively attached to the semantic of the message content like green for Success, Light Blue for fundamental info, Pale yellow desiring for user's attention and Mild red specifying there is actually 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>
This might not be discovered at a glance but the font color also is actually following this color scheme as well-- just the color options are much much darker so get subconsciously takened as black nevertheless it's not exactly so.
Exact same goes not only for the alert text message itself but even for the links provided in it-- there are link classes taking off the outline and colouring the anchor elements in the appropriate color so they suit the overall alert text look.
<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 factor to mention-- the colors take their obvious meaning only for those who actually get to see 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.
Besides links and simple HTML tags like strong for example the alert elements in Bootstrap 4 can also have Headings and paragraphs for the situations when you desire to present a bit longer web content ( get more info).
<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 as well add an X icon to dismiss the alert and add a cool transition to it to one more time make sure the visual pleasure of the Bootstrap Alert Jquery 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. Don't let however their names to limit the manner you are actually using them-- all of these are simply some color schemes and the way they will be actually performed in your web site is completely up to you and completely depends on the special circumstance.
For example-- if the color design of your page makes use of the red as main color tone it maybe pretty most suitable to show the alert for successful form submission in red too using the predefined alert danger look in order to much better mix with the webpage and save time defining your own classes.
The predefined alert classes are just some consistent appearances and the responsibility for using them lays entirely on the designer's shoulders.
Or else with information features on a button located in the alert, as indicated just above
<button type="button" class="close" data-dismiss="alert" aria-label="Close"> <span aria-hidden="true">×</span> </button>
Bear in mind that shutting off an alert will remove it from the DOM.
Bootstrap's alert plugin reveals a few events for hooking inside alert features.