For Angular 7, see answer below. I spent a lot of time to figure out how to do it, so I hope this can help someone. Preconditions I’m assuming that you have an Angular project (version 2 or 4) generated with Angular CLI 1.0 or higher. It is not mandatory to generate the project with … Read more
For my case i was importing PouchDB like this: importScripts(“//cdn.jsdelivr.net/pouchdb/5.3.1/pouchdb.min.js”); The url should start with proper http/https. So changing to this solved the problem: importScripts(“https://cdn.jsdelivr.net/pouchdb/5.3.1/pouchdb.min.js”);
async functions are just syntactic sugar around Promises and they are wrappers for callbacks. // v await is just syntactic sugar // v Promises are just wrappers // v functions taking callbacks are actually the source for the asynchronous behavior await new Promise(resolve => setTimeout(resolve)); Now a callback could be called back immediately by the … Read more
Web Workers. They’re a W3C standard (well, a working draft at the moment) for exactly this, and require no plugins: This specification defines an API that allows Web application authors to spawn background workers running scripts in parallel to their main page. The specification also discusses spreading workers across multiple cores, for true concurrency (this … Read more
You can configure Webpack to pack your worker js file into a separate bundle. In webpack.config.js: { entry: { bundle: ‘./app/main.js’, worker: ‘./app/my-worker-file.js’ }, output: { filename: ‘[name].js’ } … } This way you get two bundles: bundle.js with your main application and worker.js with the worker entrypoint. Then, inside your main bundle, you can … Read more
This uses 100% on my 2500K: var code = “while(true){}”; var URL = window.webkitURL || window.URL; var bb = new Blob([code], {type : ‘text/javascript’}); code = URL.createObjectURL(bb); new Worker(code); new Worker(code); new Worker(code); new Worker(code); http://jsfiddle.net/MTJ27/81/
The best is probably to generate a simple worker-script dynamically, which will internally call importScripts(), which is not limited by this cross-origin restriction. To understand why you can’t use a cross-domain script as a Worker init-script, see this answer. Basically, the Worker context will have its own origin set to the one of that script. … Read more
Short answer: This behavior is implementation-defined, and the specification allows behavior to vary from browser to browser (or vary situationally within one browser), except for some guarantees about event queues. Long answer: Closing or navigating away from a page causes the browser to discard the page’s document: User agents may discard top-level browsing contexts at … Read more
Turns out this method works fine, there was merely a bug in my worker: var result = greeter(“john”); should be var result = greet(“john”); which makes sense – I’m passing the greeter variable to the worker, but there’s no reason for it to know the variable name of the object I’m passing.
The close() method is visible inside the worker’s scope. The terminate() method is a part of the worker object’s interface and can be called “from the outside”. If you create a worker in your main script and want to stop it from that script you should call the terminate() on the worker object. If you … Read more