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const pageScriptInfoBySrc = new Map();
function registerPageScriptElement(src) {
if (!src) {
throw new Error('Must provide a non-empty value for the "src" attribute.');
}
let pageScriptInfo = pageScriptInfoBySrc.get(src);
if (pageScriptInfo) {
pageScriptInfo.referenceCount++;
} else {
pageScriptInfo = { referenceCount: 1, module: null };
pageScriptInfoBySrc.set(src, pageScriptInfo);
initializePageScriptModule(src, pageScriptInfo);
}
}
function unregisterPageScriptElement(src) {
if (!src) {
return;
}
const pageScriptInfo = pageScriptInfoBySrc.get(src);
if (!pageScriptInfo) {
return;
}
pageScriptInfo.referenceCount--;
}
async function initializePageScriptModule(src, pageScriptInfo) {
if (src.startsWith("./")) {
src = new URL(src.substr(2), document.baseURI).toString();
}
const module = await import(src);
if (pageScriptInfo.referenceCount <= 0) {
return;
}
pageScriptInfo.module = module;
module.onLoad?.();
module.onUpdate?.();
}
function onEnhancedLoad() {
for (const [src, { module, referenceCount }] of pageScriptInfoBySrc) {
if (referenceCount <= 0) {
module?.onDispose?.();
pageScriptInfoBySrc.delete(src);
}
}
for (const { module } of pageScriptInfoBySrc.values()) {
module?.onUpdate?.();
}
}
export function afterWebStarted(blazor) {
console.log("afterWebStarted");
customElements.define('page-script', class extends HTMLElement {
static observedAttributes = ['src'];
attributeChangedCallback(name, oldValue, newValue) {
if (name !== 'src') {
return;
}
this.src = newValue;
unregisterPageScriptElement(oldValue);
registerPageScriptElement(newValue);
}
disconnectedCallback() {
unregisterPageScriptElement(this.src);
}
});
blazor.addEventListener('enhancedload', onEnhancedLoad);
}
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