Basic Vanilla JavaScript Alert Modal Window

Category: Javascript , Modal & Popup | July 19, 2023
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Last Update:July 19, 2023


Basic Vanilla JavaScript Alert Modal Window


An extremely lightweight JavaScript library for creating modal-style alert popups with ease.

See Also: Minimal Alert & Confirm Modal JS JavaScript – Prompt.js

How to use it:

1. Import the stylesheet modal.css and script alert.js into the document.

<link rel="stylesheet" href="./modal.css">
<script src="./alert.js"></script>

2. Create the HTML for the alert modal.

<div class="modal" id="modal-alert">
  <div class="modal-overlay" tabindex="-1">
    <div class="modal-container">
      <div class="modal-header">
        <h2 class="modal-title" id="modal-alert-title">
      <div class="modal-text">
        <p id="modal-alert-content">
          Something went wrong.
      <div class="modal-buttons">
        <button class="modal-button" id="modal-button-primary" onclick="document.getElementById('modal-alert').style.display = 'none';">Close</button>

3. Display an alert modal with the show_alert method. Available parameters:

  • title: Alert title
  • message: Alert message
  • btnHide: Whether to show the close button
  • btnLabel: Label text for the close button
// show_alert(title, message, btnHide = false, btnLabel = "Close")
show_alert('No close button', 'No way to close alert, refresh tab.', true)

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