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255 lines
11 KiB
Markdown
255 lines
11 KiB
Markdown
# JavaScript Public Events
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There are a range of available events emitted as part of a public & [supported](#support) API for accessing or extending JavaScript libraries and components used in the system.
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These are emitted via standard DOM events so can be consumed using standard DOM APIs like so:
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```javascript
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window.addEventListener('event-name', event => {
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const eventData = event.detail;
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});
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```
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Such events are typically emitted from a DOM element relevant to event, which then bubbles up.
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For most use-cases you can probably just listen on the `window` as shown above.
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## Support
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This event system, and the events emitted, are considered semi-supported.
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Breaking changes of the event API, event names, or event properties, are possible but will be documented in update notes.
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The detail provided within the events, and the libraries made accessible, are not considered supported nor stable, and changes to these won't be clearly documented changelogs.
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## Event Naming Scheme
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Events are typically named in the following format:
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```text
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<context>::<action/lifecycle>
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# Examples:
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editor-tinymce::setup
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library-cm6::configure-theme
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```
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If the event is generic in use but specific to a library, the `<context>` will start with `library-` followed by the library name. Otherwise `<context>` may reflect the UI context/component.
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The `<action/lifecycle>` reflects the lifecycle stage of the context, or a specific action to perform if the event is specific to a certain use-case.
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## Event Listing
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### `editor-markdown-cm6::pre-init`
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This event is called before the markdown input editor CodeMirror instance is created or loaded.
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#### Event Data
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- `editorViewConfig` - An [EditorViewConfig](https://codemirror.net/docs/ref/#view.EditorViewConfig) object that will eventially be passed when creating the CodeMirror EditorView instance.
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##### Example
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```javascript
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// Always load the editor with specific pre-defined content if empty
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window.addEventListener('editor-markdown-cm6::pre-init', event => {
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const config = event.detail.editorViewConfig;
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config.doc = config.doc || "Start this page with a nice story";
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});
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```
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### `editor-markdown::setup`
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This event is called when the markdown editor loads, post configuration but before the editor is ready to use.
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#### Event Data
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- `markdownIt` - A references to the [MarkdownIt](https://markdown-it.github.io/markdown-it/#MarkdownIt) instance used to render markdown to HTML (Just for the preview).
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- `displayEl` - The IFrame Element that wraps the HTML preview display.
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- `cmEditorView` - The CodeMirror [EditorView](https://codemirror.net/docs/ref/#view.EditorView) instance used for the markdown input editor.
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##### Example
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```javascript
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// Set all text in the display to be red by default.
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window.addEventListener('editor-markdown::setup', event => {
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const display = event.detail.displayEl;
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display.contentDocument.body.style.color = 'red';
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});
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```
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### `editor-drawio::configure`
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This event is called as the embedded diagrams.net drawing editor loads, to allow configuration of the diagrams.net interface.
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See [this diagrams.net page](https://www.diagrams.net/doc/faq/configure-diagram-editor) for details on the available options for the configure event.
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If using a custom diagrams.net instance, via the `DRAWIO` option, you will need to ensure your DRAWIO option URL has the `configure=1` query parameter.
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#### Event Data
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- `config` - The configuration object that will be passed to diagrams.net.
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- This will likely be empty by default, but modify this object in-place as needed with your desired options.
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##### Example
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```javascript
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// Set only the "general" and "android" libraries to show by default
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window.addEventListener('editor-drawio::configure', event => {
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const config = event.detail.config;
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config.enabledLibraries = ["general", "android"];
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});
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```
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### `editor-tinymce::pre-init`
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This event is called before the TinyMCE editor, used as the BookStack WYSIWYG page editor, is initialised.
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#### Event Data
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- `config` - Object containing the configuration that's going to be passed to [tinymce.init](https://www.tiny.cloud/docs/api/tinymce/root_tinymce/#init).
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##### Example
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```javascript
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// Removed "bold" from the editor toolbar
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window.addEventListener('editor-tinymce::pre-init', event => {
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const tinyConfig = event.detail.config;
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tinyConfig.toolbar = tinyConfig.toolbar.replace('bold ', '');
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});
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```
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### `editor-tinymce::setup`
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This event is called during the `setup` lifecycle stage of the TinyMCE editor used as the BookStack WYSIWYG editor. This is after configuration, but before the editor is fully loaded and ready to use.
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##### Event Data
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- `editor` - The [tinymce.Editor](https://www.tiny.cloud/docs/api/tinymce/tinymce.editor/) instance used for the WYSIWYG editor.
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##### Example
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```javascript
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// Replaces the editor content with redacted message 3 seconds after load.
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window.addEventListener('editor-tinymce::setup', event => {
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const editor = event.detail.editor;
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setTimeout(() => {
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editor.setContent('REDACTED!');
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}, 3000);
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});
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```
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### `library-cm6::configure-theme`
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This event is called whenever a CodeMirror instance is loaded, as a method to configure the theme used by CodeMirror. This applies to all CodeMirror instances including in-page code blocks, editors using in BookStack settings, and the Page markdown editor.
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#### Event Data
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- `darkModeActive` - A boolean to indicate if the current view/page is being loaded with dark mode active.
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- `registerViewTheme(builder)` - A method that can be called to register a new view (CodeMirror UI) theme.
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- `builder` - A function that will return an object that will be passed into the CodeMirror [EditorView.theme()](https://codemirror.net/docs/ref/#view.EditorView^theme) function as a StyleSpec.
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- `registerHighlightStyle(builder)` - A method that can be called to register a new HighlightStyle (code highlighting) theme.
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- `builder` - A function, that receives a reference to [Tag.tags](https://lezer.codemirror.net/docs/ref/#highlight.tags) and returns an array of [TagStyle](https://codemirror.net/docs/ref/#language.TagStyle) objects.
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##### Example
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The below shows registering a custom "Solarized dark" editor and syntax theme:
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<details>
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<summary>Show Example</summary>
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```javascript
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// Theme data taken from:
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// https://github.com/craftzdog/cm6-themes/blob/main/packages/solarized-dark/src/index.ts
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// (MIT License) - Copyright (C) 2022 by Takuya Matsuyama and others
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const base00 = '#002b36',
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base01 = '#073642',
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base02 = '#586e75',
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base03 = '#657b83',
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base04 = '#839496',
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base05 = '#93a1a1',
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base06 = '#eee8d5',
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base07 = '#fdf6e3',
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base_red = '#dc322f',
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base_orange = '#cb4b16',
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base_yellow = '#b58900',
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base_green = '#859900',
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base_cyan = '#2aa198',
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base_blue = '#268bd2',
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base_violet = '#6c71c4',
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base_magenta = '#d33682'
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const invalid = '#d30102',
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stone = base04,
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darkBackground = '#00252f',
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highlightBackground = '#173541',
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background = base00,
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tooltipBackground = base01,
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selection = '#173541',
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cursor = base04
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function viewThemeBuilder() {
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return {
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'&':{color:base05,backgroundColor:background},
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'.cm-content':{caretColor:cursor},
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'.cm-cursor, .cm-dropCursor':{borderLeftColor:cursor},
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'&.cm-focused .cm-selectionBackground, .cm-selectionBackground, .cm-content ::selection':{backgroundColor:selection},
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'.cm-panels':{backgroundColor:darkBackground,color:base03},
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'.cm-panels.cm-panels-top':{borderBottom:'2px solid black'},
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'.cm-panels.cm-panels-bottom':{borderTop:'2px solid black'},
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'.cm-searchMatch':{backgroundColor:'#72a1ff59',outline:'1px solid #457dff'},
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'.cm-searchMatch.cm-searchMatch-selected':{backgroundColor:'#6199ff2f'},
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'.cm-activeLine':{backgroundColor:highlightBackground},
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'.cm-selectionMatch':{backgroundColor:'#aafe661a'},
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'&.cm-focused .cm-matchingBracket, &.cm-focused .cm-nonmatchingBracket':{outline:`1px solid ${base06}`},
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'.cm-gutters':{backgroundColor:darkBackground,color:stone,border:'none'},
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'.cm-activeLineGutter':{backgroundColor:highlightBackground},
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'.cm-foldPlaceholder':{backgroundColor:'transparent',border:'none',color:'#ddd'},
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'.cm-tooltip':{border:'none',backgroundColor:tooltipBackground},
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'.cm-tooltip .cm-tooltip-arrow:before':{borderTopColor:'transparent',borderBottomColor:'transparent'},
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'.cm-tooltip .cm-tooltip-arrow:after':{borderTopColor:tooltipBackground,borderBottomColor:tooltipBackground},
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'.cm-tooltip-autocomplete':{
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'& > ul > li[aria-selected]':{backgroundColor:highlightBackground,color:base03}
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}
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};
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}
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function highlightStyleBuilder(t) {
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return [{tag:t.keyword,color:base_green},
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{tag:[t.name,t.deleted,t.character,t.propertyName,t.macroName],color:base_cyan},
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{tag:[t.variableName],color:base05},
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{tag:[t.function(t.variableName)],color:base_blue},
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{tag:[t.labelName],color:base_magenta},
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{tag:[t.color,t.constant(t.name),t.standard(t.name)],color:base_yellow},
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{tag:[t.definition(t.name),t.separator],color:base_cyan},
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{tag:[t.brace],color:base_magenta},
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{tag:[t.annotation],color:invalid},
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{tag:[t.number,t.changed,t.annotation,t.modifier,t.self,t.namespace],color:base_magenta},
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{tag:[t.typeName,t.className],color:base_orange},
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{tag:[t.operator,t.operatorKeyword],color:base_violet},
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{tag:[t.tagName],color:base_blue},
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{tag:[t.squareBracket],color:base_red},
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{tag:[t.angleBracket],color:base02},
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{tag:[t.attributeName],color:base05},
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{tag:[t.regexp],color:invalid},
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{tag:[t.quote],color:base_green},
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{tag:[t.string],color:base_yellow},
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{tag:t.link,color:base_cyan,textDecoration:'underline',textUnderlinePosition:'under'},
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{tag:[t.url,t.escape,t.special(t.string)],color:base_yellow},
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{tag:[t.meta],color:base_red},
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{tag:[t.comment],color:base02,fontStyle:'italic'},
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{tag:t.strong,fontWeight:'bold',color:base06},
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{tag:t.emphasis,fontStyle:'italic',color:base_green},
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{tag:t.strikethrough,textDecoration:'line-through'},
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{tag:t.heading,fontWeight:'bold',color:base_yellow},
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{tag:t.heading1,fontWeight:'bold',color:base07},
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{tag:[t.heading2,t.heading3,t.heading4],fontWeight:'bold',color:base06},
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{tag:[t.heading5,t.heading6],color:base06},
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{tag:[t.atom,t.bool,t.special(t.variableName)],color:base_magenta},
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{tag:[t.processingInstruction,t.inserted,t.contentSeparator],color:base_red},
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{tag:[t.contentSeparator],color:base_yellow},
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{tag:t.invalid,color:base02,borderBottom:`1px dotted ${base_red}`}];
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}
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window.addEventListener('library-cm6::configure-theme', event => {
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const detail = event.detail;
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detail.registerViewTheme(viewThemeBuilder);
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detail.registerHighlightStyle(highlightStyleBuilder);
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});
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```
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</details> |