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import vegaEmbed from "https://esm.sh/vega-embed@6?deps=vega@5&deps=vega-lite@5.20.1";
import lodashDebounce from "https://esm.sh/lodash-es@4.17.21/debounce";
// Note: For offline support, the import lines above are removed and the remaining script
// is bundled using vl-convert's javascript_bundle function. See the documentation of
// the javascript_bundle function for details on the available imports and their names.
// If an additional import is required in the future, it will need to be added to vl-convert
// in order to preserve offline support.
async function render({ model, el }) {
let finalize;
function showError(error){
el.innerHTML = (
'<div style="color:red;">'
+ '<p>JavaScript Error: ' + error.message + '</p>'
+ "<p>This usually means there's a typo in your chart specification. "
+ "See the javascript console for the full traceback.</p>"
+ '</div>'
);
}
const reembed = async () => {
if (finalize != null) {
finalize();
}
model.set("local_tz", Intl.DateTimeFormat().resolvedOptions().timeZone);
let spec = structuredClone(model.get("spec"));
if (spec == null) {
// Remove any existing chart and return
while (el.firstChild) {
el.removeChild(el.lastChild);
}
model.save_changes();
return;
}
let embedOptions = structuredClone(model.get("embed_options")) ?? undefined;
let api;
try {
api = await vegaEmbed(el, spec, embedOptions);
} catch (error) {
showError(error)
return;
}
finalize = api.finalize;
// Debounce config
const wait = model.get("debounce_wait") ?? 10;
const debounceOpts = {leading: false, trailing: true};
if (model.get("max_wait") ?? true) {
debounceOpts["maxWait"] = wait;
}
const initialSelections = {};
for (const selectionName of Object.keys(model.get("_vl_selections"))) {
const storeName = `${selectionName}_store`;
const selectionHandler = (_, value) => {
const newSelections = cleanJson(model.get("_vl_selections") ?? {});
const store = cleanJson(api.view.data(storeName) ?? []);
newSelections[selectionName] = {value, store};
model.set("_vl_selections", newSelections);
model.save_changes();
};
api.view.addSignalListener(selectionName, lodashDebounce(selectionHandler, wait, debounceOpts));
initialSelections[selectionName] = {
value: cleanJson(api.view.signal(selectionName) ?? {}),
store: cleanJson(api.view.data(storeName) ?? [])
}
}
model.set("_vl_selections", initialSelections);
const initialParams = {};
for (const paramName of Object.keys(model.get("_params"))) {
const paramHandler = (_, value) => {
const newParams = JSON.parse(JSON.stringify(model.get("_params"))) || {};
newParams[paramName] = value;
model.set("_params", newParams);
model.save_changes();
};
api.view.addSignalListener(paramName, lodashDebounce(paramHandler, wait, debounceOpts));
initialParams[paramName] = api.view.signal(paramName) ?? null
}
model.set("_params", initialParams);
model.save_changes();
// Param change callback
model.on('change:_params', async (new_params) => {
for (const [param, value] of Object.entries(new_params.changed._params)) {
api.view.signal(param, value);
}
await api.view.runAsync();
});
// Add signal/data listeners
for (const watch of model.get("_js_watch_plan") ?? []) {
if (watch.namespace === "data") {
const dataHandler = (_, value) => {
model.set("_js_to_py_updates", [{
namespace: "data",
name: watch.name,
scope: watch.scope,
value: cleanJson(value)
}]);
model.save_changes();
};
addDataListener(api.view, watch.name, watch.scope, lodashDebounce(dataHandler, wait, debounceOpts))
} else if (watch.namespace === "signal") {
const signalHandler = (_, value) => {
model.set("_js_to_py_updates", [{
namespace: "signal",
name: watch.name,
scope: watch.scope,
value: cleanJson(value)
}]);
model.save_changes();
};
addSignalListener(api.view, watch.name, watch.scope, lodashDebounce(signalHandler, wait, debounceOpts))
}
}
// Add signal/data updaters
model.on('change:_py_to_js_updates', async (updates) => {
for (const update of updates.changed._py_to_js_updates ?? []) {
if (update.namespace === "signal") {
setSignalValue(api.view, update.name, update.scope, update.value);
} else if (update.namespace === "data") {
setDataValue(api.view, update.name, update.scope, update.value);
}
}
await api.view.runAsync();
});
}
model.on('change:spec', reembed);
model.on('change:embed_options', reembed);
model.on('change:debounce_wait', reembed);
model.on('change:max_wait', reembed);
await reembed();
}
function cleanJson(data) {
return JSON.parse(JSON.stringify(data))
}
function getNestedRuntime(view, scope) {
var runtime = view._runtime;
for (const index of scope) {
runtime = runtime.subcontext[index];
}
return runtime
}
function lookupSignalOp(view, name, scope) {
let parent_runtime = getNestedRuntime(view, scope);
return parent_runtime.signals[name] ?? null;
}
function dataRef(view, name, scope) {
let parent_runtime = getNestedRuntime(view, scope);
return parent_runtime.data[name];
}
export function setSignalValue(view, name, scope, value) {
let signal_op = lookupSignalOp(view, name, scope);
view.update(signal_op, value);
}
export function setDataValue(view, name, scope, value) {
let dataset = dataRef(view, name, scope);
let changeset = view.changeset().remove(() => true).insert(value)
dataset.modified = true;
view.pulse(dataset.input, changeset);
}
export function addSignalListener(view, name, scope, handler) {
let signal_op = lookupSignalOp(view, name, scope);
return addOperatorListener(
view,
name,
signal_op,
handler,
);
}
export function addDataListener(view, name, scope, handler) {
let dataset = dataRef(view, name, scope).values;
return addOperatorListener(
view,
name,
dataset,
handler,
);
}
// Private helpers from Vega for dealing with nested signals/data
function findOperatorHandler(op, handler) {
const h = (op._targets || [])
.filter(op => op._update && op._update.handler === handler);
return h.length ? h[0] : null;
}
function addOperatorListener(view, name, op, handler) {
let h = findOperatorHandler(op, handler);
if (!h) {
h = trap(view, () => handler(name, op.value));
h.handler = handler;
view.on(op, null, h);
}
return view;
}
function trap(view, fn) {
return !fn ? null : function() {
try {
fn.apply(this, arguments);
} catch (error) {
view.error(error);
}
};
}
export default { render }
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