dialog-el | Vaadin

An a11y equipped dialog element written for the modern browser with Web Components

[ This description is mirrored from README.md at github.com/jshcrowthe/dialog-el on 2019-05-10 ]

Build Status Published on webcomponents.org


This repo is a Custom Element for creating accessible dialogs/modals It is heavily inspired by Polymer's paper-dialog and the A11y Dialog fork from Edenspiekermann.


There are no non-native dependencies in this Web Component. If your browser supports the following two things you are good. If not you will need to make sure you load the Polyfills first




<dialog-el id='dialog'>
  <h1>A header</h1>
  <p>Dialog Content</p>

<dialog-el id='modal' modal>
  <h1>A modal</h1>
  <p>Modal Content</p>


var dialogEl = document.createElement('dialog-el');


  • dialog.show

    This is the means of displaying the dialog/modal. Simply select the element and call this method to display the dialog/modal.


    var dialog = document.querySelector('dialog-el');

    This function returns a Promise that you can use to perform operations after the dialog/modal has displayed.

    NOTE: The show function, if called on an already open dialog, will throw an error

    dialog.show can also take an optional DOM Element as an argument. If passed the dialog will attempt to intelligently position itself relative to the passed element.


    var dialog = document.querySelector('dialog-el');
    var button = document.querySelector('#myMagicButton');

    Positioning will be handled based on the existence of a valid arrowPosition value. If the value does not exist the dialog will position itself where there is the most available screen real estate. If the value does exist, the dialog will be positioned such that the arrow points at the center of the passed element.


    • If your dialog-el is positioned inside of a container with overflow: hidden this can cause the dialog to not be visible on the screen.

    • Your dialog must have a fixed height & width to ensure correct positioning, consider doing something like the following:

        .sizeMe {
          width: 500px;
          height: 300px;
        <div class='sizeMe'>
  • dialog.close

    This is the means of closing an open dialog/modal. Simply select the element and call this method to close it.


    var dialog = document.querySelector('dialog-el');

    This function returns a Promise that you can use to perform operations after the dialog/modal has closed.

    NOTE: The close function, if called on an already closed dialog, will throw an error


  • modal

    If set the dialog will render as a fixed position modal instead of an absolute positioned dialog.

  • arrowDirection

    Based on the value of this property (left, right, top, bottom), it will render an arrow on that side of the dialog. For example, a value of left adds an arrow to the left side of the dialog.


    <dialog-el arrow-direction='left'>
      <h1>A header</h1>
      <p>Dialog Content</p>
    var dialog = document.createElement('dialog-el');
    dialog.arrowDirection = 'left';

    NOTE: This does not work with the modal property


  • dialog-opened

    Fired whenever the dialog is opened.

  • dialog-closed

    Fired whenever the dialog is closed.

CSS Custom Properties

Use these to override default styles

Property Name Description Default Value
--dialog-el-padding Used as the padding for the dialog 15px
--dialog-el-background Used for the background property of the dialog #FFFFFF

These defaults effectively wrap your provided local DOM in a 15px white border. Override them to change the appearance.


Link to this version
ImportedReleased 09 March 2017MIT License
Framework Support
Polymer 1.0+
Browser Independent
Install with
bower install --save jshcrowthe/dialog-el"#1.2.0"
Run the above Bower command in your project folder. If you have any issues installing, please contact the author.
Release notes - Version 1.2.0


  • webcomponentsjs#webcomponents/webcomponentsjs#^0.7.22
  • promise-polyfill#taylorhakes/promise-polyfill#^6.0.1