In this guide, we will discuss Alert plugin in Bootstrap. Alert messages are mostly used to display information such as warning or confirmation messages to the end users. Using alert message plugin you can add dismiss functionality to all alert messages.
If you want to include this plugin functionality individually, then you will need the alert.js. Else, as mentioned in the chapter Bootstrap Plugins Overview, you can include the bootstrap.js or the minified bootstrap.min.js.
Usage
You can enable dismissal of an alert in the following two ways −
- Via data attributes − To dismiss via Data API just add data-dismiss = “alert” to your close button to automatically give an alert close functionality.
<a class = "close" data-dismiss = "alert" href = "#" aria-hidden = "true"> × </a>
- Via JavaScript − To dismiss via JavaScript use the following syntax −
$(".alert").alert()
Example
The following example demonstrates the use of alert plugin via data attributes.
div class = "alert alert-success">
<a href = "#" class = "close" data-dismiss = "alert">
×
</a>
<strong>Warning!</strong> There was a problem with your network connection.
</div>
Options
There are no options here.
Methods
The following are some useful methods for alert plugin −
| Method | Description | Example |
|---|---|---|
| .alert() | This method wraps all alerts with close functionality. | $(‘#identifier’).alert(); |
| Close Method .alert(‘close’) | To enable all alerts to be closed, add this method. | $(‘#identifier’).alert(‘close’); |
To enable alerts to animate out when closed, make sure they have the .fade and .in class already applied to them.
Example
The following example demonstrates the use of .alert() method −
<h3>Alert messages to demonstrate alert() method </h3>
<div id = "myAlert" class = "alert alert-success">
<a href = "#" class = "close" data-dismiss = "alert">×</a>
<strong>Success!</strong> the result is successful.
</div>
<div id = "myAlert" class = "alert alert-warning">
<a href = "#" class = "close" data-dismiss = "alert">×</a>
<strong>Warning!</strong> There was a problem with your network connection.
</div>
<script type = "text/javascript">
$(function(){
$(".close").click(function(){
$("#myAlert").alert();
});
});
</script>
The following example demonstrates the use of .alert(‘close’) method −
<h3>Alert messages to demonstrate alert('close') method </h3>
<div id = "myAlert" class = "alert alert-success">
<a href = "#" class = "close" data-dismiss = "alert">×</a>
<strong>Success!</strong> the result is successful.
</div>
<div id = "myAlert" class = "alert alert-warning">
<a href = "#" class = "close" data-dismiss = "alert">×</a>
<strong>Warning!</strong> There was a problem with your network connection.
</div>
<script type = "text/javascript">
$(function(){
$(".close").click(function(){
$("#myAlert").alert('close');
});
});
</script>
Try this code using the Try it editor. You can see that the close functionality is applied to all the alert messages i.e. close any alert message, rest of the alert messages also gets closed.
Events
Following table lists the events to work with alert plugin. This event may be used to hook into the alert function.
| Event | Description | Example |
|---|---|---|
| close.bs.alert | This event fires immediately when the close instance method is called. | $(‘#myalert’).bind(‘close.bs.alert’, function () { // do something }) |
| closed.bs.alert | This event is fired when the alert has been closed (will wait for CSS transitions to complete). | $(‘#myalert’).bind(‘closed.bs.alert’, function () { // do something }) |
Example
The following example demonstrates the alert plugin events −
<div id = "myAlert" class = "alert alert-success">
<a href = "#" class = "close" data-dismiss = "alert">×</a>
<strong>Success!</strong> the result is successful.
</div>
<script type = "text/javascript">
$(function(){
$("#myAlert").bind('closed.bs.alert', function () {
alert("Alert message box is closed.");
});
});
</script>
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