progressive-web-apps

I am trying to cache firebase database information for offline usage. In my ProgressiveWebApp, I am using javascript and jquery. Is there a way to mirror database without using polymer Thank you 来源： https://stackoverflow.com/questions/40954993/cache-firebase-database-for-offline-usage-with-javascript

I have attached install event to service worker as below. But Install event fired before register event is completed. See code snippets and console logs below. My concern is how install event is fired before register event is completed? if ('serviceWorker' in navigator) { navigator.serviceWorker.register('./service-worker.js',{scope : '/'}).then(function(registration) { // Registration was successful console.log('ServiceWorker registration successful with scope: ', registration.scope); }).catch(function(err) { // registration failed :( console.log('ServiceWorker registration failed: ', err); }

I am using TabBar in my application where I need to get Input in first tab and show output based on some calculation on other tab. I am able to get input in first tab but when I click on second tab, my state is lost. I am not sure if I have to make it a Stateful widget at root level. I am relatively new in Mobile App. Can someone help me out here? EDIT: Now I am able to achieve what I said above, but when I am trying to access the list of items from first tab, it throws null exception in second tab? I solved the above problem using AutomaticKeepAliveClientMixin as described in the answer below

Is it possible to host multiple PWAs under same endpoint. Say, I have three different PWAs Under root and then root should host these 3 PWAs in such a way that when I switch to any other apps via link or menu it shouldn't open in different window. Currently, it is getting opened in different window as web app whenever, I am clicking on different app. Thanks, Rahul You may refer with this thread . It stated that you can accomplish this with scoped apps. Update your manifest files to include a scope parameter with a value of the path that "app" should be served under. "scope": "/r/aizumap/", and

I have a manifest.json according to the MDN spec and while it works correctly when browsing the website from a mobile device (add to homescreen popup shows up, theme color and icons load...etc) Chrome Dev Tools is unable to parse it. The same problem persists on Lighthouse (chrome extension). Has anyone seen a similar issue? I would think that the JSON is invalid however copy-pasting into Web App Validator it is marked correct, but when inputting the URL it giving a parse error: File isn't valid JSON: SyntaxError: Unexpected token in JSON at position 0 It is probably a BOM character issue in