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Polyfill for the HTML dialog element

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Quick Overview

Dialog-polyfill is a lightweight JavaScript library that provides a polyfill for the HTML <dialog> element. It enables the use of native-like dialog functionality in browsers that don't support the <dialog> element, ensuring consistent behavior across different platforms and browsers.

Pros

  • Easy to implement and integrate into existing projects
  • Provides a consistent dialog experience across various browsers
  • Lightweight and has minimal dependencies
  • Follows the native <dialog> element API closely

Cons

  • May become unnecessary as browser support for <dialog> improves
  • Limited styling options compared to custom dialog implementations
  • Potential performance impact on older browsers
  • Requires JavaScript to function, which may not be ideal for all use cases

Code Examples

  1. Basic usage of dialog-polyfill:
// Register the dialog element
var dialog = document.querySelector('dialog');
dialogPolyfill.registerDialog(dialog);

// Open the dialog
dialog.showModal();

// Close the dialog
dialog.close();
  1. Using dialog-polyfill with a form:
<dialog id="favDialog">
  <form method="dialog">
    <p><label>Favorite animal:
      <select>
        <option value="default">Choose…</option>
        <option>Brine shrimp</option>
        <option>Red panda</option>
        <option>Spider monkey</option>
      </select>
    </label></p>
    <menu>
      <button value="cancel">Cancel</button>
      <button id="confirmBtn" value="default">Confirm</button>
    </menu>
  </form>
</dialog>

<script>
  var dialog = document.getElementById('favDialog');
  dialogPolyfill.registerDialog(dialog);
  document.querySelector('button').onclick = function() {
    dialog.showModal();
  };
</script>
  1. Styling a polyfilled dialog:
dialog {
  padding: 0;
  border: 0;
  border-radius: 0.6rem;
  box-shadow: 0 0 1em black;
}

dialog::backdrop {
  background-color: rgba(0, 0, 0, 0.4);
}

Getting Started

  1. Include the dialog-polyfill script and CSS in your HTML file:
<link rel="stylesheet" href="https://unpkg.com/dialog-polyfill@0.5.6/dist/dialog-polyfill.css">
<script src="https://unpkg.com/dialog-polyfill@0.5.6/dist/dialog-polyfill.js"></script>
  1. Create a dialog element in your HTML:
<dialog id="myDialog">
  <h2>Dialog Title</h2>
  <p>Dialog content goes here.</p>
  <button id="closeDialog">Close</button>
</dialog>
  1. Register the dialog and add functionality in your JavaScript:
var dialog = document.getElementById('myDialog');
dialogPolyfill.registerDialog(dialog);

document.getElementById('openDialog').addEventListener('click', function() {
  dialog.showModal();
});

document.getElementById('closeDialog').addEventListener('click', function() {
  dialog.close();
});

Competitor Comparisons

floating-ui logo

floating-ui

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A JavaScript library to position floating elements and create interactions for them.

Pros of floating-ui

  • More comprehensive positioning library for various UI elements, not limited to dialogs
  • Actively maintained with frequent updates and a larger community
  • Supports complex positioning scenarios like flip, shift, and arrow placement

Cons of floating-ui

  • Steeper learning curve due to more extensive API and options
  • May be overkill for simple dialog positioning needs
  • Requires more setup and configuration compared to a simple polyfill

Code Comparison

dialog-polyfill:

var dialog = document.querySelector('dialog');
dialogPolyfill.registerDialog(dialog);
dialog.showModal();

floating-ui:

import {computePosition, flip, shift, offset} from '@floating-ui/dom';

computePosition(button, tooltip, {
  placement: 'top',
  middleware: [offset(6), flip(), shift({padding: 5})]
}).then(({x, y}) => {
  Object.assign(tooltip.style, {
    left: `${x}px`,
    top: `${y}px`,
  });
});

Summary

floating-ui offers a more powerful and flexible solution for positioning UI elements, including but not limited to dialogs. It provides advanced features and ongoing development but requires more setup and learning. dialog-polyfill, on the other hand, is a simpler solution specifically for dialog elements, with easier implementation but limited functionality beyond basic dialog support.

KittyGiraudel logo

a11y-dialog

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A very lightweight and flexible accessible modal dialog script.

Pros of a11y-dialog

  • Lightweight and focused on accessibility, with built-in ARIA support
  • Customizable styling and behavior through CSS and JavaScript
  • Supports multiple instances and nested dialogs

Cons of a11y-dialog

  • Requires more setup and configuration compared to dialog-polyfill
  • May need additional work to achieve full browser compatibility

Code Comparison

a11y-dialog:

import A11yDialog from 'a11y-dialog'

const dialog = new A11yDialog(document.getElementById('my-dialog'))
dialog.show()
dialog.hide()

dialog-polyfill:

import dialogPolyfill from 'dialog-polyfill'

const dialog = document.querySelector('dialog')
dialogPolyfill.registerDialog(dialog)
dialog.showModal()
dialog.close()

Key Differences

  • a11y-dialog focuses on accessibility and customization, while dialog-polyfill aims to provide native <dialog> element support
  • a11y-dialog requires more initial setup but offers greater flexibility in styling and behavior
  • dialog-polyfill integrates more seamlessly with existing HTML structures using the <dialog> element

Use Cases

  • Choose a11y-dialog for projects prioritizing accessibility and custom dialog implementations
  • Opt for dialog-polyfill when working with existing <dialog> elements or aiming for a more native-like experience

Both libraries serve different purposes and can be valuable depending on project requirements and browser support needs.

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drop

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Pros of Drop

  • More versatile positioning options for dropdowns and tooltips
  • Supports custom animations and transitions
  • Actively maintained with regular updates

Cons of Drop

  • Larger file size and potentially more complex to implement
  • May require additional configuration for accessibility features
  • Less focused on dialog functionality compared to dialog-polyfill

Code Comparison

dialog-polyfill:

var dialog = document.querySelector('dialog');
dialogPolyfill.registerDialog(dialog);
dialog.showModal();

Drop:

new Drop({
  target: document.querySelector('#target'),
  content: 'Dropdown content',
  position: 'bottom left',
  openOn: 'click'
});

Summary

dialog-polyfill is specifically designed to provide dialog functionality for browsers that don't support the <dialog> element natively. It's lightweight and focused on this single purpose.

Drop, on the other hand, is a more comprehensive library for creating various types of dropdowns, tooltips, and popovers. It offers more flexibility in terms of positioning and customization but may be overkill if you only need basic dialog functionality.

Choose dialog-polyfill for simple dialog implementations, especially if browser compatibility is a concern. Opt for Drop if you need more advanced positioning and styling options for various types of overlays and dropdowns.

atomiks logo

tippyjs

11,981

Tooltip, popover, dropdown, and menu library

Pros of Tippy.js

  • More feature-rich, offering advanced tooltip and popover functionality
  • Highly customizable with extensive styling options and animations
  • Active development and regular updates

Cons of Tippy.js

  • Larger file size and potentially higher performance overhead
  • Steeper learning curve due to more complex API and configuration options

Code Comparison

dialog-polyfill:

var dialog = document.querySelector('dialog');
dialogPolyfill.registerDialog(dialog);
dialog.showModal();

Tippy.js:

tippy('#myButton', {
  content: 'Hello, Tippy!',
  placement: 'top',
  animation: 'scale'
});

Key Differences

  • Purpose: dialog-polyfill focuses on providing a polyfill for the HTML <dialog> element, while Tippy.js is a comprehensive tooltip and popover library.
  • Scope: dialog-polyfill has a narrow focus on dialog functionality, whereas Tippy.js offers a wide range of features for various UI elements.
  • Implementation: dialog-polyfill enhances native browser capabilities, while Tippy.js provides a standalone solution for tooltips and popovers.

Use Cases

  • dialog-polyfill: Ideal for projects requiring cross-browser support for native dialog elements.
  • Tippy.js: Best suited for applications needing advanced tooltip and popover functionality with extensive customization options.
floating-ui logo

floating-ui

29,850

A JavaScript library to position floating elements and create interactions for them.

Pros of floating-ui

  • More comprehensive positioning library for various UI elements, not limited to dialogs
  • Actively maintained with frequent updates and a larger community
  • Supports complex positioning scenarios like flip, shift, and arrow placement

Cons of floating-ui

  • Steeper learning curve due to more extensive API and options
  • May be overkill for simple dialog positioning needs
  • Requires more setup and configuration compared to a simple polyfill

Code Comparison

dialog-polyfill:

var dialog = document.querySelector('dialog');
dialogPolyfill.registerDialog(dialog);
dialog.showModal();

floating-ui:

import {computePosition, flip, shift, offset} from '@floating-ui/dom';

computePosition(button, tooltip, {
  placement: 'top',
  middleware: [offset(6), flip(), shift({padding: 5})]
}).then(({x, y}) => {
  Object.assign(tooltip.style, {
    left: `${x}px`,
    top: `${y}px`,
  });
});

Summary

floating-ui offers a more powerful and flexible solution for positioning UI elements, including but not limited to dialogs. It provides advanced features and ongoing development but requires more setup and learning. dialog-polyfill, on the other hand, is a simpler solution specifically for dialog elements, with easier implementation but limited functionality beyond basic dialog support.

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README

dialog-polyfill.js is a polyfill for <dialog> and <form method="dialog">. Check out some demos!

<dialog> is an element for a popup box in a web page, including a modal option which will make the rest of the page inert during use. This could be useful to block a user's interaction until they give you a response, or to confirm an action. See the HTML spec.

Usage

Installation

You may optionally install via NPM -

$ npm install dialog-polyfill

There are several ways that to include the dialog polyfill:

  • include dist/dialog-polyfill.js script directly in your HTML, which exposes a global dialogPolyfill function.
  • import (es modules)
  • require (commonjs/node)
// direct import (script module, deno)
import dialogPolyfill from './node_modules/dialog-polyfill/dist/dialog-polyfill.esm.js';

// *OR*

// modern es modules with rollup/webpack bundlers, and node via esm module
import dialogPolyfill from 'dialog-polyfill'

// *OR*

// traditional commonjs/node and browserify bundler
const dialogPolyfill = require('dialog-polyfill')

Supports

This polyfill works on modern versions of all major browsers. It also supports IE9 and above. It can work when used inside Shadow DOM, but it's not recommended.

Steps

  1. Include the CSS in the <head> of your document, and the JS anywhere before referencing dialogPolyfill.
  2. Create your dialog elements within the document. See limitations for more details.
  3. Register the elements using dialogPolyfill.registerDialog(), passing it one node at a time. This polyfill won't replace native support.
  4. Use your <dialog> elements!

Script Global Example

<head>
  <link rel="stylesheet" type="text/css" href="dist/dialog-polyfill.css" />
</head>
<body>
  <dialog>
    I'm a dialog!
    <form method="dialog">
      <input type="submit" value="Close" />
    </form>
  </dialog>
  <script src="dist/dialog-polyfill.js"></script>
  <script>
    var dialog = document.querySelector('dialog');
    dialogPolyfill.registerDialog(dialog);
    // Now dialog always acts like a native <dialog>.
    dialog.showModal();
  </script>
</body>

::backdrop

In native <dialog>, the backdrop is a pseudo-element. When using the polyfill, the backdrop will be an adjacent element:

dialog::backdrop { /* native */
  background-color: green;
}
dialog + .backdrop { /* polyfill */
  background-color: green;
}

Limitations

In the polyfill, modal dialogs have limitations-

  • They should not be contained by parents that create a stacking context, see below
  • The browser's chrome may not always be accessible via the tab key
  • Changes to the CSS top/bottom values while open aren't retained

Stacking Context

The major limitation of the polyfill is that dialogs should not have parents that create a stacking context. The easiest way to solve this is to move your <dialog> element to be a child of <body>.

If this isn't possible you may still be able to use the dialog. However, you may want to resolve it for two major reasons-

  1. The polyfill can't guarantee that the dialog will be the top-most element of your page
  2. The dialog may be positioned incorrectly as they are positioned as part of the page layout where they are opened (defined by spec), and not at a fixed position in the user's browser.

To position a dialog in the center (regardless of user scroll position or stacking context), you can specify the following CSS-

dialog {
  position: fixed;
  top: 50%;
  transform: translate(0, -50%);
}

This is also provided as a helper CSS class in the polyfill CSS, .fixed. You can apply by using HTML like <dialog class="fixed">.

Extensions

Focus

The WAI-ARIA doc suggests returning focus to the previously focused element after a modal dialog is closed. However, this is not part of the dialog spec itself. See this snippet to add this, even to the native dialog.

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