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JavaScript Plugin API, providing custom panels and column menu items
Thanks, Cameron Yick. #2052 Co-authored-by: Simon Willison <[email protected]>
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// Custom events for use with the native CustomEvent API | ||
const DATASETTE_EVENTS = { | ||
INIT: "datasette_init", // returns datasette manager instance in evt.detail | ||
}; | ||
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// Datasette "core" -> Methods/APIs that are foundational | ||
// Plugins will have greater stability if they use the functional hooks- but if they do decide to hook into | ||
// literal DOM selectors, they'll have an easier time using these addresses. | ||
const DOM_SELECTORS = { | ||
/** Should have one match */ | ||
jsonExportLink: ".export-links a[href*=json]", | ||
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/** Event listeners that go outside of the main table, e.g. existing scroll listener */ | ||
tableWrapper: ".table-wrapper", | ||
table: "table.rows-and-columns", | ||
aboveTablePanel: ".above-table-panel", | ||
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// These could have multiple matches | ||
/** Used for selecting table headers. Use makeColumnActions if you want to add menu items. */ | ||
tableHeaders: `table.rows-and-columns th`, | ||
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/** Used to add "where" clauses to query using direct manipulation */ | ||
filterRows: ".filter-row", | ||
/** Used to show top available enum values for a column ("facets") */ | ||
facetResults: ".facet-results [data-column]", | ||
}; | ||
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/** | ||
* Monolith class for interacting with Datasette JS API | ||
* Imported with DEFER, runs after main document parsed | ||
* For now, manually synced with datasette/version.py | ||
*/ | ||
const datasetteManager = { | ||
VERSION: window.datasetteVersion, | ||
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// TODO: Should order of registration matter more? | ||
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// Should plugins be allowed to clobber others or is it last-in takes priority? | ||
// Does pluginMetadata need to be serializable, or can we let it be stateful / have functions? | ||
plugins: new Map(), | ||
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registerPlugin: (name, pluginMetadata) => { | ||
if (datasetteManager.plugins.has(name)) { | ||
console.warn(`Warning -> plugin ${name} was redefined`); | ||
} | ||
datasetteManager.plugins.set(name, pluginMetadata); | ||
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// If the plugin participates in the panel... update the panel. | ||
if (pluginMetadata.makeAboveTablePanelConfigs) { | ||
datasetteManager.renderAboveTablePanel(); | ||
} | ||
}, | ||
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/** | ||
* New DOM elements are created on each click, so the data is not stale. | ||
* | ||
* Items | ||
* - must provide label (text) | ||
* - might provide href (string) or an onclick ((evt) => void) | ||
* | ||
* columnMeta is metadata stored on the column header (TH) as a DOMStringMap | ||
* - column: string | ||
* - columnNotNull: boolean | ||
* - columnType: sqlite datatype enum (text, number, etc) | ||
* - isPk: boolean | ||
*/ | ||
makeColumnActions: (columnMeta) => { | ||
let columnActions = []; | ||
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// Accept function that returns list of columnActions with keys | ||
// Required: label (text) | ||
// Optional: onClick or href | ||
datasetteManager.plugins.forEach((plugin) => { | ||
if (plugin.makeColumnActions) { | ||
// Plugins can provide multiple columnActions if they want | ||
// If multiple try to create entry with same label, the last one deletes the others | ||
columnActions.push(...plugin.makeColumnActions(columnMeta)); | ||
} | ||
}); | ||
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// TODO: Validate columnAction configs and give informative error message if missing keys. | ||
return columnActions; | ||
}, | ||
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/** | ||
* In MVP, each plugin can only have 1 instance. | ||
* In future, panels could be repeated. We omit that for now since so many plugins depend on | ||
* shared URL state, so having multiple instances of plugin at same time is problematic. | ||
* Currently, we never destroy any panels, we just hide them. | ||
* | ||
* TODO: nicer panel css, show panel selection state. | ||
* TODO: does this hook need to take any arguments? | ||
*/ | ||
renderAboveTablePanel: () => { | ||
const aboveTablePanel = document.querySelector( | ||
DOM_SELECTORS.aboveTablePanel | ||
); | ||
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if (!aboveTablePanel) { | ||
console.warn( | ||
"This page does not have a table, the renderAboveTablePanel cannot be used." | ||
); | ||
return; | ||
} | ||
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let aboveTablePanelWrapper = aboveTablePanel.querySelector(".panels"); | ||
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// First render: create wrappers. Otherwise, reuse previous. | ||
if (!aboveTablePanelWrapper) { | ||
aboveTablePanelWrapper = document.createElement("div"); | ||
aboveTablePanelWrapper.classList.add("tab-contents"); | ||
const panelNav = document.createElement("div"); | ||
panelNav.classList.add("tab-controls"); | ||
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// Temporary: css for minimal amount of breathing room. | ||
panelNav.style.display = "flex"; | ||
panelNav.style.gap = "8px"; | ||
panelNav.style.marginTop = "4px"; | ||
panelNav.style.marginBottom = "20px"; | ||
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aboveTablePanel.appendChild(panelNav); | ||
aboveTablePanel.appendChild(aboveTablePanelWrapper); | ||
} | ||
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datasetteManager.plugins.forEach((plugin, pluginName) => { | ||
const { makeAboveTablePanelConfigs } = plugin; | ||
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if (makeAboveTablePanelConfigs) { | ||
const controls = aboveTablePanel.querySelector(".tab-controls"); | ||
const contents = aboveTablePanel.querySelector(".tab-contents"); | ||
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// Each plugin can make multiple panels | ||
const configs = makeAboveTablePanelConfigs(); | ||
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configs.forEach((config, i) => { | ||
const nodeContentId = `${pluginName}_${config.id}_panel-content`; | ||
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// quit if we've already registered this plugin | ||
// TODO: look into whether plugins should be allowed to ask | ||
// parent to re-render, or if they should manage that internally. | ||
if (document.getElementById(nodeContentId)) { | ||
return; | ||
} | ||
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// Add tab control button | ||
const pluginControl = document.createElement("button"); | ||
pluginControl.textContent = config.label; | ||
pluginControl.onclick = () => { | ||
contents.childNodes.forEach((node) => { | ||
if (node.id === nodeContentId) { | ||
node.style.display = "block"; | ||
} else { | ||
node.style.display = "none"; | ||
} | ||
}); | ||
}; | ||
controls.appendChild(pluginControl); | ||
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// Add plugin content area | ||
const pluginNode = document.createElement("div"); | ||
pluginNode.id = nodeContentId; | ||
config.render(pluginNode); | ||
pluginNode.style.display = "none"; // Default to hidden unless you're ifrst | ||
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contents.appendChild(pluginNode); | ||
}); | ||
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// Let first node be selected by default | ||
if (contents.childNodes.length) { | ||
contents.childNodes[0].style.display = "block"; | ||
} | ||
} | ||
}); | ||
}, | ||
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/** Selectors for document (DOM) elements. Store identifier instead of immediate references in case they haven't loaded when Manager starts. */ | ||
selectors: DOM_SELECTORS, | ||
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// Future API ideas | ||
// Fetch page's data in array, and cache so plugins could reuse it | ||
// Provide knowledge of what datasette JS or server-side via traditional console autocomplete | ||
// State helpers: URL params https://github.com/simonw/datasette/issues/1144 and localstorage | ||
// UI Hooks: command + k, tab manager hook | ||
// Should we notify plugins that have dependencies | ||
// when all dependencies were fulfilled? (leaflet, codemirror, etc) | ||
// https://github.com/simonw/datasette-leaflet -> this way | ||
// multiple plugins can all request the same copy of leaflet. | ||
}; | ||
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const initializeDatasette = () => { | ||
// Hide the global behind __ prefix. Ideally they should be listening for the | ||
// DATASETTE_EVENTS.INIT event to avoid the habit of reading from the window. | ||
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window.__DATASETTE__ = datasetteManager; | ||
console.debug("Datasette Manager Created!"); | ||
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const initDatasetteEvent = new CustomEvent(DATASETTE_EVENTS.INIT, { | ||
detail: datasetteManager, | ||
}); | ||
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document.dispatchEvent(initDatasetteEvent); | ||
}; | ||
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/** | ||
* Main function | ||
* Fires AFTER the document has been parsed | ||
*/ | ||
document.addEventListener("DOMContentLoaded", function () { | ||
initializeDatasette(); | ||
}); |
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from datasette import hookimpl | ||
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# Test command: | ||
# datasette fixtures.db \ --plugins-dir=demos/plugins/ | ||
# \ --static static:demos/plugins/static | ||
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# Create a set with view names that qualify for this JS, since plugins won't do anything on other pages | ||
# Same pattern as in Nteract data explorer | ||
# https://github.com/hydrosquall/datasette-nteract-data-explorer/blob/main/datasette_nteract_data_explorer/__init__.py#L77 | ||
PERMITTED_VIEWS = {"table", "query", "database"} | ||
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@hookimpl | ||
def extra_js_urls(view_name): | ||
print(view_name) | ||
if view_name in PERMITTED_VIEWS: | ||
return [ | ||
{ | ||
"url": f"/static/table-example-plugins.js", | ||
} | ||
] |
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