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script.js
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script.js
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import { platform } from '../../core/platform.js';
import { script } from '../script.js';
import { ScriptType } from '../script/script-type.js';
import { ScriptTypes } from '../script/script-types.js';
import { registerScript } from '../script/script.js';
import { ResourceLoader } from './loader.js';
import { ResourceHandler } from './handler.js';
import { ScriptAttributes } from '../script/script-attributes.js';
const toLowerCamelCase = str => str[0].toLowerCase() + str.substring(1);
/**
* Resource handler for loading JavaScript files dynamically. Two types of JavaScript files can be
* loaded, PlayCanvas scripts which contain calls to {@link createScript}, or regular JavaScript
* files, such as third-party libraries.
*
* @category Script
*/
class ScriptHandler extends ResourceHandler {
/**
* Create a new ScriptHandler instance.
*
* @param {import('../app-base.js').AppBase} app - The running {@link AppBase}.
* @ignore
*/
constructor(app) {
super(app, 'script');
this._scripts = { };
this._cache = { };
}
clearCache() {
for (const key in this._cache) {
const element = this._cache[key];
const parent = element.parentNode;
if (parent)
parent.removeChild(element);
}
this._cache = {};
}
load(url, callback) {
// Scripts don't support bundling since we concatenate them. Below is for consistency.
if (typeof url === 'string') {
url = {
load: url,
original: url
};
}
const self = this;
script.app = this._app;
const onScriptLoad = (url.load, (err, url, extra) => {
if (!err) {
const obj = { };
for (let i = 0; i < ScriptTypes._types.length; i++)
obj[ScriptTypes._types[i].name] = ScriptTypes._types[i];
ScriptTypes._types.length = 0;
callback(null, obj, extra);
// no cache for scripts
delete self._loader._cache[ResourceLoader.makeKey(url, 'script')];
} else {
callback(err);
}
});
// check if we're loading a module or a classic script
const [basePath, search] = url.load.split('?');
const isEsmScript = basePath.endsWith('.mjs');
if (isEsmScript) {
// The browser will hold its own cache of the script, so we need to bust it
let path = url.load;
if (path.startsWith(this._app.assets.prefix)) {
path = path.replace(this._app.assets.prefix, '');
}
const hash = this._app.assets.getByUrl(path).file.hash;
const searchParams = new URLSearchParams(search);
searchParams.set('hash', hash);
const urlWithHash = `${basePath}?${searchParams.toString()}`;
this._loadModule(urlWithHash, onScriptLoad);
} else {
this._loadScript(url.load, onScriptLoad);
}
}
open(url, data) {
return data;
}
patch(asset, assets) { }
_loadScript(url, callback) {
const head = document.head;
const element = document.createElement('script');
this._cache[url] = element;
// use async=false to force scripts to execute in order
element.async = false;
element.addEventListener('error', function (e) {
callback(`Script: ${e.target.src} failed to load`);
}, false);
let done = false;
element.onload = element.onreadystatechange = function () {
if (!done && (!this.readyState || (this.readyState === 'loaded' || this.readyState === 'complete'))) {
done = true; // prevent double event firing
callback(null, url, element);
}
};
// set the src attribute after the onload callback is set, to avoid an instant loading failing to fire the callback
element.src = url;
head.appendChild(element);
}
_loadModule(url, callback) {
// if we're in the browser, we need to use the full URL
const baseUrl = platform.browser ? window.location.origin + window.location.pathname : import.meta.url;
const importUrl = new URL(url, baseUrl);
// @ts-ignore
import(importUrl.toString()).then((module) => {
for (const key in module) {
const scriptClass = module[key];
const extendsScriptType = scriptClass.prototype instanceof ScriptType;
if (extendsScriptType) {
// Check if attributes is defined directly on the class and not inherited
if (scriptClass.hasOwnProperty('attributes')) {
const attributes = new ScriptAttributes(scriptClass);
for (const key in scriptClass.attributes) {
attributes.add(key, scriptClass.attributes[key]);
}
scriptClass.attributes = attributes;
}
registerScript(scriptClass, toLowerCamelCase(scriptClass.name));
}
}
callback(null, url, null);
}).catch((err) => {
callback(err);
});
}
}
export { ScriptHandler };