Can you explain the functionality of dismissing a Bootstrap alert?

Question

Can you explain the functionality of dismissing a Bootstrap alert?

In this example, we can see how Bootstrap handles dismissible alerts:

<div class="alert alert-warning alert-dismissible" role="alert">
    <button type="button" class="close" data-dismiss="alert" aria-label="Close">
        <span aria-hidden="true">&times;</span></button>
    <strong>Warning!</strong> Better check yourself, you're not looking too good.
</div>

I am curious about the mechanism behind the JavaScript handler attached to the button that closes the corresponding div element. What happens if there are multiple div elements with the same classes and attributes - how does the framework identify the correct one to hide?

P.S. I wonder if the functionality will still be reliable if the role="alert" attribute is removed.

javascript css twitter-bootstrap-3

Answer 1

Answer №1

By placing the button inside the alert element, event listeners can easily pinpoint the element where an event took place and then navigate through its parent(s), siblings, and so on.

Here is a simplified example without using any framework:

$('.alert .myButton').click(function() {
  // "this" refers to the instance of myButton where the event occurred
  $(this).closest('div.alert').hide()
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="alert">
  Content 1 <button class="myButton">Hide Content 1</button>
</div>

<div class="alert">
  Content 2 <button class="myButton">Hide Content 2</button>
</div>

Answer 2

By placing the button inside the alert element, event listeners can easily pinpoint the element where an event took place and then navigate through its parent(s), siblings, and so on.

Here is a simplified example without using any framework:

$('.alert .myButton').click(function() {
  // "this" refers to the instance of myButton where the event occurred
  $(this).closest('div.alert').hide()
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="alert">
  Content 1 <button class="myButton">Hide Content 1</button>
</div>

<div class="alert">
  Content 2 <button class="myButton">Hide Content 2</button>
</div>

Can you explain the functionality of dismissing a Bootstrap alert?

Answer №1

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