html alert box example - Brave Search

How to change the style of alert box?

stackoverflow.com › questions › 7853130 › how-to-change-the-style-of-alert-box

The alert box is a system object, and not subject to CSS. To do this style of thing you would need to create an HTML element and mimic the alert() functionality. The jQuery UI Dialogue does a lot of the work for you, working basically as I have described: Link.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>jQuery UI Dialog - Default functionality</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
  <script>
  $( function() {
    $( "#dialog" ).dialog();
  } );
  </script>
</head>
<body>
 
<div id="dialog" title="Basic dialog">
  <p>This is the default dialog which is useful for displaying information. The dialog window can be moved, resized and closed with the 'x' icon.</p>
</div>
 
 
</body>
</html>

Answer from PCasagrande on Stack Overflow

w3schools.com › howto › howto_js_alert.asp

How To Create an Alert Message Box

Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.

w3schools.com › jsref › met_win_alert.asp

Window alert() Method

More examples below. The alert() method displays an alert box with a message and an OK button.

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geeksforgeeks.org › html › html-dom-window-alert-method

HTML DOM Window alert() Method - GeeksforGeeks

In this example the alert() is used to display a message box when the button is double-clicked. The message informs users about GeeksforGeeks. It's a simple way to show notifications or information.

Published July 11, 2025

developer.mozilla.org › en-US › docs › Web › API › Window › alert

Window: alert() method - Web APIs | MDN

window.alert() instructs the browser to display a dialog with an optional message, and to wait until the user dismisses the dialog.

stackoverflow.com › questions › 7853130 › how-to-change-the-style-of-alert-box

javascript - How to change the style of alert box?

The alert box is a system object, and not subject to CSS. To do this style of thing you would need to create an HTML element and mimic the alert() functionality. The jQuery UI Dialogue does a lot of the work for you, working basically as I have described: Link.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>jQuery UI Dialog - Default functionality</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
  <script>
  $( function() {
    $( "#dialog" ).dialog();
  } );
  </script>
</head>
<body>
 
<div id="dialog" title="Basic dialog">
  <p>This is the default dialog which is useful for displaying information. The dialog window can be moved, resized and closed with the 'x' icon.</p>
</div>
 
 
</body>
</html>

I use SweetAlert, It's Awesome, You will get lots of customization option as well as all callbacks

swal("Here's a message!", "It's pretty, isn't it?");

w3schools.com › js › js_popup.asp

JavaScript Popup Boxes

The window.alert() method can be written without the window prefix. ... A confirm box is often used if you want the user to verify or accept something. When a confirm box pops up, the user will have to click either "OK" or "Cancel" to proceed.

quackit.com › javascript › javascript_alert_box.cfm

JavaScript Alert Box

This example, on the other hand, loads automatically as the page is loading. By placing the code by itself (i.e. not within a link/button), this will automatically trigger the alert box as soon as the page is loading. The alert will popup as the browser renders the code. Therefore, if you place the code within the <head> tags, your alert box will popup before the HTML ...

onecompiler.com › html › 3xfmfsrwk

html alert box - HTML - OneCompiler

The editor shows sample boilerplate code when you choose language as HTML.

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University of Washington

washington.edu › accesscomputing › webd2 › student › unit5 › module2 › lesson1.html

Lesson 1: Using JavaScript to Show an Alert

As mentioned in Beyond HTML, a variable in a programming or scripting language is a symbolic name that represents a value. In our earlier PHP example, we used the variable $thisPage to control certain features in the showTop() function. In PHP, variable names must start with a $, but that isn't the case in JavaScript. Take a look at the following example, which uses a variable named myText to customize the text that's displayed in the alert box...

projects.accesscomputing.uw.edu › webd2 › student › unit5 › module2 › lesson1.html

Lesson 5.2.1: Using JavaScript to Show an Alert

As mentioned in Beyond HTML, a variable in a programming or scripting language is a symbolic name that represents a value. In our earlier PHP example, we used the variable $thisPage to control certain features in the showTop() function. In PHP, variable names must start with a $, but that isn't the case in JavaScript. Take a look at the following example, which uses a variable named myText to customize the text that's displayed in the alert box...

w3schools.com › js › tryit.asp

W3Schools Tryit Editor - JavaScript Alert

The W3Schools online code editor allows you to edit code and view the result in your browser

www-db.deis.unibo.it › courses › TW › DOCS › w3schools › howto › howto_js_alert.asp.html

How To Create an Alert Message Box

Well organized and easy to understand Web bulding tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, and XML.

geeksforgeeks.org › javascript › how-to-design-a-custom-alert-box-using-javascript

How to Design a Custom Alert Box using JavaScript ? - GeeksforGeeks

July 23, 2025 - Then import the SweetAlert2 library by adding the appropriate <link> tag in the <head> section of your HTML file for CSS, and <script> tag before the closing <body> tag for JavaScript. When the button is clicked, then trigger the SweetAlert2 alert box by calling the Swal.fire() function with some desired options such as title, text, icon, and confirm button text. Example: The below example illustrates the implementation to design a custom alert box using SweetAlert2 library.

w3schools.com › bootstrap › bootstrap_alerts.asp

Bootstrap Alerts

To close the alert message, add a .alert-dismissible class to the alert container. Then add class="close" and data-dismiss="alert" to a link or a button element (when you click on this the alert box will disappear).

geeksforgeeks.org › html › how-to-show-javascript-alert-box-in-the-middle-of-the-screen

How to show JavaScript alert box in the middle of the screen? - GeeksforGeeks

July 23, 2025 - Example: The code below shows an alert box in the middle of the screen using CSS and JavaScript. ... <!DOCTYPE html> <html> <head> <title>Centered Alert Box</title> <style> body { display: flex; flex-direction: column; justify-content: center; ...

alertbox.js.org

AlertBox - A simple, beautiful, responsive, easy to use, customizable text for JavaScript's Alert Box.

alertbox.render({ alertIcon: 'warning', title: 'Thank You!', message: 'AlertBox Popup Message', btnTitle: 'Ok', border:true });

stackoverflow.com › questions › 41136691 › how-to-design-alert-box-in-html

How to design alert box in HTML - javascript

The javascript alert() is a system message box that will will block your page whilst it displays and will look different on different operating systems. What you are looking for is usually referred to as a dialog box or modal popup, these are constructed using html and javascript to look like the page behind is blocked or greyed out. If you are starting out, you could look at some examples like: https://www.w3schools.com/howto/howto_css_modals.asp These are build from scratch.

TutorialsTeacher

tutorialsteacher.com › javascript › display-popup-message-in-javascript

JavaScript Message Boxes: alert(), confirm(), prompt()

alert("This is an alert message box."); // display string message alert('This is a numer: ' + 100); // display result of a concatenation alert(100); // display number alert(Date()); // display current date ...

stackoverflow.com › questions › 57319443 › how-to-display-alert-box-in-using-htmljavascript-and-node

how to display alert box in using html+javascript and node - Stack Overflow

I think that the problem is that you are not telling nodeJS where your statics files are. For me, the simplest way is to set the server with Express

 $ npm install express

And then setting up the server and where your static directory is:

var express = require('express');
var app = express();

//setting middleware
app.use(express.static(__dirname + 'public')); //Serves resources from public folder


var server = app.listen(5000);

There are other ways to doit using Native NodeJS, here are some resources:

Nodejs.org - How to serve static files

Also, you can write the script directly in your html file:

<!DOCTYPE html>
<html>
    <head>
            <script>
                function showBox(){
                  alert("this is alert box");    
                 }   
             </script>
    </head>
    <body onload="showBox()">
        <h1>Heading</h1>
        <p>Paragraph</p>        
    </body>
</html>

Your server is only ever returning index.html, no matter what path is requested. So, your watch.js is never loaded. The contents of index.html are returned instead of watch.js.

Either handle the other paths in your server code, or use something like Express.static, which does this for you.

accessibility.psu.edu › scripts › alertboxes

Accessibility at Penn State | Alert Boxes

September 15, 2018 - The code for the button is a FORM element with the question embedded in a LABEL tag and a button with the an onClick event triggering the alert box.