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Using Data Attributes (Recommended for Simplicity)
Using JavaScript
Home Web Front-end Bootstrap Tutorial How to open a Bootstrap modal with a button click?

How to open a Bootstrap modal with a button click?

Nov 17, 2025 am 12:56 AM
modal

To open a Bootstrap modal box by clicking a button, you need to set the HTML structure of the modal box and use the data attribute or JavaScript to trigger it. 1. Use data attributes: add data-bs-toggle="modal" and data-bs-target="#modalId" on the button (Bootstrap 4 uses data-toggle and data-target); 2. Use JavaScript: get the modal instance through bootstrap.Modal.getOrCreateInstance() and call the .show() method. Make sure the Bootstrap JavaScript files are included.

How to open a Bootstrap modal with a button click?

To open a Bootstrap modal with a button click, you need to set up the modal HTML structure and use Bootstrap's data attributes or JavaScript to trigger it when a button is clicked. This works in Bootstrap 4 and 5.

This method requires no custom JavaScript. Just configure your button and modal correctly.

Add these key attributes to your button:

  • data-bs-toggle="modal" : Tells Bootstrap the element will toggle a modal
  • data-bs-target="#yourModalId" : Points to the modal's ID using a CSS selector
Note: In Bootstrap 4, use data-toggle and data-target instead of data-bs-* .

Example:

 <!-- Button -->
<button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#exampleModal">
  Open Modal
</button>
<p><!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Modal Title</h5>
<button type="button" class="btn-close" data-bs-dismiss="modal"></button>
</div>
<div class="modal-body">
<p>Modal content goes here.</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save</button>
</div>
</div>
</div>
</div>

Using JavaScript

If you prefer programmatic control, use JavaScript to show the modal.

First, get the modal instance using bootstrap.Modal.getOrCreateInstance() , then call .show() .

Example:

 const modalElement = document.getElementById(&#39;exampleModal&#39;);
const modal = bootstrap.Modal.getOrCreateInstance(modalElement);
<p>// Show the modal when button is clicked
document.getElementById(&#39;openModalBtn&#39;).addEventListener(&#39;click&#39;, () => {
modal.show();
});

Make sure Bootstrap's JavaScript is loaded in your project for either method to work.

Basically just link the button to the modal using data attributes or script — both ways are reliable.

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