Bootstrap 4 Show Alerts

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In Bootstrap v4 how do I show alerts through JavaScript? My goal is to have the alert hidden when the page loads then when a AJAX call completes turn the alert on to display a message.

I see in the documentation how close the alert but no where how to display it: https://getbootstrap.com/docs/4.0/components/alerts/#methods

I have the following fiddle where I show the alert first (not what I want) then press a button to close it. A second button is there to turn it back on but no clue what to pass to it to make it work. I figure if I can make this sample work I can then figure out how to make it work with the alert not displayed on the page load

https://jsfiddle.net/jhf2e5h6/

<div class="row">
  <div class="col-sm-12">
     <div id="divInfo" class="alert alert-success show fade ">
        <div class="alert-heading"> :</div> <p></p>
     </div>
 </div>
</div>

<button id="close">Close</button>
<button id="show">Show</button>




<script type="text/javascript">
    $(function () {




        $('#close').on('click', function () {
            $('#divInfo').alert('close');
        });

        $('#Show').on('click', function () {
            $('#divInfo').alert('?????');
        });

        // 
    });


</script>

Method .alert destroys the DOM. So no possibility to go back. Have a look to documentation : https://getbootstrap.com/docs/4.0/components/alerts/#methods

You should try to use removeClass/addClass.

$('#close').on('click', function () {
    $('#divInfo').removeClass('show');
});

$('#show').on('click', function () {
    $('#divInfo').addClass('show');
});

And you have mistake on 'Show', you should try 'show'.

Alerts, Method .alert destroys the DOM. So no possibility to go back. Have a look to documentation  Bootstrap 4 Show Alerts. In Bootstrap v4 how do I show alerts through JavaScript? My goal is to have the alert hidden when the page loads then when a AJAX call completes turn the alert on to display a message. I have the following fiddle where I show the alert first (not what I want) then press a button to close it.

close removes it from the DOM so it can't be re-shown.

You can instead toggle the invisible class...

https://www.codeply.com/go/mbshAxZQMH

 $(function () {
    $('#close').on('click', function () {
        $('#divInfo').addClass('invisible');
    });

    $('#show').on('click', function () {
        $('#divInfo').removeClass('invisible');
    });
});

Bootstrap 4 Alerts, If your alert doesn't have a close button you can skip this class. Bootstrap 4 provides total 8 different types of alerts. The following example will show you the most  Alerts. Provide contextual feedback messages for typical user actions with the handful of available and flexible alert messages. Examples. Alerts are available for any length of text, as well as an optional dismiss button. For proper styling, use one of the eight required contextual classes (e.g., .alert-success).

I prefer to dynamically create alert content

<div id="alert"></div>

<script type="text/javscript">
function showAlert(obj){
    var html = '<div class="alert alert-' + obj.class + ' alert-dismissible" role="alert">'+
        '   <strong>' + obj.message + '</strong>'+
        '       <button class="close" type="button" data-dismiss="alert" aria-label="Close">'+
        '           <span aria-hidden="true">×</span>'+
        '       </button>'
        '   </div>';

    $('#alert').append(html);
}

 $('#Show').on('click', function () {
    showAlert({message: 'Hello word!', class:"danger"});
 });

Bootstrap 4 Show Alerts, Bootstrap 4 provides an easy way to create predefined alert messages. <div class="alert alert-warning alert-dismissible fade show">; <button  Bootstrap 4 provides total 8 different types of alerts. The following example will show you the most commonly used alerts, which are: success, error or danger, warning and info alerts.

Bootstrap 4 has .d-none, which does display: none. This comes in handy if your alert contains a dismiss button.

So add .d-none to your .alert element (e.g. on page load), and do the following:

// Show the alert
$('.alert').removeClass('d-none').addClass('show');

// Hide the alert
$('.alert').addClass('d-none').removeClass('show');

Bootstrap 4 Warning, Info, Success and Error Alerts, Bootstrap allows showing these alert messages on the website using predefined classes. The .alert class followed by contextual classes are used to display the  Bootstrap 4 Alert Height Bootstrap Alert height is defined by values of padding, hence changing the values will make the height low or high from its default value. All values are used in rem only and must be used as per latest changes in Bootstrap 4.

5 Ways to Use Bootstrap Alerts, Warning, Error, Success & Info , Learn how to add HTML content inside alert, showing dismiss button, inserting font awesome icons and adding icon images in the alert box. Close Alerts Via data-* Attributes. Add data-dismiss="alert" to a link or a button element to close the alert message.. To use Bootstrap 4 alert in your project, you need have the following downloaded or cdn link scripts.

Bootstrap 4, Bootstrap alerts give contextual feedback information for common user <div class="alert alert-warning alert-dismissible fade show"  Bootstrap 4 Alerts Tutorial Updated on May 1, 2019 Posted by Editorial Staff Bootstrap, Web Designing, Website Building No Comments Alert messages are very popular with JavaScript to provide interactive information to users. It is used for form validations and throwing messages on the browser.

Bootstrap 4 Alerts Tutorial » WebNots, Toasts are lightweight notifications designed to mimic the push notifications that Toast headers use display: flex , allowing easy alignment of content thanks to Bootstrap 4 + Material Design 2.0; 400+ eCommerce components; MDB PRO  Default Bootstrap Alerts. This is a primary alert message to show some detail. This is a secondary alert message to show some detail. This is a success message to show positive action. This is a information message to show more detail. This is a warning alert to indicate a warning before trying.

Comments
  • This doesn't really answer the question, since this will display the alert as soon as the page loads instead of waiting for the AJAX call to complete.
  • updated for show alert on button click, or when AJAX call to complete as was said