Link

The Link feature brings support for link editing to the rich-text editor. It allows for inserting hyperlinks into the edited content and offers the UI to create and edit them.

Thanks to the autolink plugin, typed or pasted URLs and e-mail addresses will be automatically turned into working links as you type.

# Demo

Use the Link toolbar button or press Ctrl/Cmd+K to create a new link. Clicking on a link will activate the contextual toolbar, from which you can edit existing links or unlink them with a click.

# Typing around links

CKEditor 5 allows for typing both at inner and outer boundaries of links to make the editing easier for the users.

To type inside a link, move the caret to its (start or end) boundary. As long as the link remains highlighted (by default: blue), typing and applying formatting will be done within its boundaries:

To type before or after a link, move the caret to its boundary, then press the Arrow key (→ or ←) once. The link is no longer highlighted and whatever text you type or formatting you apply will not be enclosed by the link:

# Custom link attributes (decorators)

By default, all links created in the editor have the href="..." attribute in the editor data. If you want your links to have additional link attributes, link decorators provide an easy way to configure and manage them.

There are two types of link decorators you can use:

• Automatic – They match links against pre–defined rules and manage their attributes based on the results.
• Manual – They allow users to control link attributes individually using the editor UI.

# Demo

In the editor below, all external links get the target="_blank" and rel="noopener noreferrer" attributes (automatic decorator). Click a link and edit it to see that it is possible to control the download attribute of specific links using the switch button in the editing balloon (manual decorator). Take a look at the editor data below (updated live) to see the additional link attributes.

The following code was used to run the editor. Learn more about the configuration of the feature.

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        toolbar: {
            items: [
                // ...
                'link'
            ],
        },
        link: {
            // Automatically add target="_blank" and rel="noopener noreferrer" to all external links.
            addTargetToExternalLinks: true,

            // Let the users control the "download" attribute of each link.
            decorators: [
                {
                    mode: 'manual',
                    label: 'Downloadable',
                    attributes: {
                        download: 'download'
                    }
                }
            ]
        }
    } )
    .then( ... )
    .catch( ... );

# Configuration

Decorators are configured through definitions provided in the config.link.decorators configuration option.

Each decorator definition must have its own unique name. In case of manual decorators, that name also represents the decorator in the document model.

# Adding target and rel attributes to external links

A very common use case for (automatic) link decorators is adding target="_blank" and rel="noopener noreferrer" attributes to all external links in the document. A dedicated config.link.addTargetToExternalLinks configuration has been created for that purpose. When this option is set to true, all links starting with http://, https:// or // are “decorated” with target and rel attributes.

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        // ...
        link: {
            addTargetToExternalLinks: true
        }
    } )
    .then( ... )
    .catch( ... );

Internally, this configuration corresponds to an automatic decorator with the following definition:

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        // ...
        link: {
            decorators: {
                addTargetToExternalLinks: {
                    mode: 'automatic',
                    callback: url => /^(https?:)?\/\//.test( url ),
                    attributes: {
                        target: '_blank',
                        rel: 'noopener noreferrer'
                    }
                }
            }
        }
    } )
    .then( ... )
    .catch( ... );

If you want to leave the decision whether a link should open in a new tab to the users, do not use the config.link.addTargetToExternalLinks configuration but define a new manual decorator with the following definition instead:

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        // ...
        link: {
            decorators: {
                openInNewTab: {
                    mode: 'manual',
                    label: 'Open in a new tab',
                    attributes: {
                        target: '_blank',
                        rel: 'noopener noreferrer'
                    }
                }
            }
        }
    } )
    .then( ... )
    .catch( ... );

# Adding default link protocol to external links

A default link protocol can be useful when the user forgets to type the full URL address to an external source or website. Sometimes copying the text, like for example ckeditor.com, and converting it to a link may cause some issues. As a result, the created link will direct you to yourdomain.com/ckeditor.com because of the missing protocol. This makes the link relative to the site where it appears.

After you enable the config.link.defaultProtocol configuration option, the link feature will be able to handle this issue for you. By default it does not fix the passed link value, but when you set config.link.defaultProtocol to, for example, http://, the plugin will add the given protocol to every link that may need it (like ckeditor.com, example.com, etc. where [protocol://]example.com is missing).

See a basic configuration example:

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        // ...
        link: {
            defaultProtocol: 'http://'
        }
    } )
    .then( ... )
    .catch( ... );

# Adding attributes to links based on pre–defined rules (automatic decorators)

Automatic link decorators match all links in the editor content against a function which decides whether the link should receive some set of attributes, considering the URL (href) of the link. These decorators work silently and are being applied during the data downcast only.

For instance, to create an automatic decorator that adds the download="file.pdf" attribute to all links ending with the ".pdf" extension, you should add the following definition to config.link.decorators:

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        // ...
        link: {
            decorators: {
                detectDownloadable: {
                    mode: 'automatic',
                    callback: url => url.endsWith( '.pdf' ),
                    attributes: {
                        download: 'file.pdf'
                    }
                }
            }
        }
    } )
    .then( ... )
    .catch( ... );

# Adding attributes to links using the UI (manual decorators)

Manual link decorators are represented in the link editing balloon as switch buttons that the users can use to control the presence of attributes of a particular link (check out the demo to learn more). Each manual decorator definition contains a human–readable label displayed next to the switch button in the link editing balloon. Make sure it is compact and precise for the convenience of the users.

To configure a “Downloadable” switch button in the link editing balloon that adds the download="file" attribute to the link when turned on, add the following definition to config.link.decorators:

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        // ...
        link: {
            decorators: {
                toggleDownloadable: {
                    mode: 'manual',
                    label: 'Downloadable',
                    attributes: {
                        download: 'file'
                    }
                },
                openInNewTab: {
                    mode: 'manual',
                    label: 'Open in a new tab',
                    defaultValue: true,			// This option will be selected by default.
                    attributes: {
                        target: '_blank',
                        rel: 'noopener noreferrer'
                    }
                }
            }
        }
    } )
    .then( ... )
    .catch( ... );

# Autolink feature

Automatic linking of URLs typed or pasted into the editor is enabled by default in the predefined builds. The AutoLink feature will automatically turn URLs or e-mail addresses into real, working links.

To use the autolink function simply press Space, Enter or Shift+Enter after a link.

# Installation

To add this feature to your editor, install the @ckeditor/ckeditor5-link package:

npm install --save @ckeditor/ckeditor5-link

Then add the Link and AutoLink plugins to your plugin list:

import Link from '@ckeditor/ckeditor5-link/src/link';
import AutoLink from '@ckeditor/ckeditor5-link/src/autolink';

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        plugins: [ Link, AutoLink, ... ],
        toolbar: [ 'link', ... ],
    } )
    .then( ... )
    .catch( ... );

# Common API

The Link plugin registers the UI button component ('link') and the following commands:

• The 'link' command implemented by LinkCommand.
• The 'unlink' command implemented by UnlinkCommand.

The commands can be executed using the editor.execute() method:

// Applies the link to the selected content.
// When the selection is collapsed, it creates new text wrapped in a link.
editor.execute( 'link', 'http://example.com' );

// If there are decorators configured, the command can set their state.
editor.execute( 'link', 'http://example.com', { linkIsExternal: true } );

// Removes the link from the selection (and all decorators if present).
editor.execute( 'unlink' );

The package provides a plugin for linking images. See the Linking images section in the feature guide.

Links are represented in the model using the linkHref attribute. Manual link decorators are represented in the model using text attributes corresponding to their names, as configured in config.link.decorators.

# Contribute

The source code of the feature is available on GitHub in https://github.com/ckeditor/ckeditor5/tree/master/packages/ckeditor5-link.