Strategy for refreshing a Polymer application

Our application is a Polymer 2 single-page app that incorporates custom build steps to create versioned resource files using gulp-rev-all. Everything is functioning properly, but we are now looking to implement a secure way of refreshing the application. Currently, we are storing the latest git commit in a file served alongside the application, periodically checking for updates and notifying users of a new version available, prompting them to refresh the app by clicking a button.

The issue arises due to our use of a service worker with pre-cache as part of the default Polymer build setup. This presents a challenge because when we execute location.reload(), it retrieves content (such as index.html) from the service worker rather than the server.

Therefore, the question at hand is: How can we ensure that the service worker is invalidated, forcing a new refresh of both service-worker.js and index.html?

javascriptpolymerservice-workerpolymer-2.x

Answer №1

Below is the comprehensive code that explains how to manage a service worker:

if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register('sw.js').then(function(reg) {
    // updatefound is fired if sw.js changes.
    reg.onupdatefound = function() {
    // The updatefound event implies that reg.installing is set; see
    // https://w3c.github.io/ServiceWorker/#service-worker-registration-updatefound-event
    var installingWorker = reg.installing;
    installingWorker.onstatechange = function() {
    switch (installingWorker.state) {
        case 'installed':
            if (navigator.serviceWorker.controller) {
            // At this point, the old content will have been purged and the fresh content will
            // have been added to the cache.
            // It's the perfect time to display a "New content is available; please refresh."
            // message in the page's interface.
            console.log('New or updated content is available.');
            // Need to hard refresh when new content is available
            location.reload(true);
            } else {
                // At this point, everything has been precached.
                // It's the perfect time to display a "Content is cached for offline use." message.
                console.log('Content is now available offline!');
                }
            break;
        case 'redundant':
            console.error('The installing service worker became redundant.');
            break;
        }
    };
    };

    }).catch(function(e) {
       console.error('Error during service worker registration:', e);
        });
     }

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

How can you select all elements within a class except for the following element?

Here is my jQuery code snippet: $(function(){ $(".details").hide(); $("li").mouseenter(function(){ $(this).css("color","blue"); }); $("li").mouseleave(function(){ $(this).css("color","black"); }); $("li").click(func ...

javascriptjquery

Facing issues connecting index.js to the database in React and unable to resolve the problem

After creating a frontend for users to submit movie reviews to a database, I am now attempting to connect a MySQL database that I set up to the index.js file. My goal is to have the database populated with the first entry. I am working on achieving this by ...

javascriptmysqlnode.jsreactjsdatabase

Guide on transferring data from a component to App.vue in Vue 3, even with a router-view in the mix

I have the following layout: src components Footer.vue views Page.vue App.vue I want to access the 'message' vari ...

javascriptvue.jsvuejs3

Switching the language based on user preference in a React Native application

I am currently developing an app with React Native and I need the capability to change the language of the app dynamically. I have referred to a sample project at https://github.com/appfoundry/react-native-multi-language-sample as a guide. Following this, ...

javascriptreactjsreact-nativereact-reduxreact-native-ios

Passing form data to a different route using express

I need to send the data from this form, located on the index.ejs page, to another page "/rentingForm" for rendering at the "rentingForm" page. Here is the snippet of code from my app.js file: app.use(bodyParser.urlencoded({ extended: true })); app.use( bo ...

javascriptnode.jsformsexpressejs

Execute a JavaScript function when an element loaded via Ajax in a Spring MVC framework triggers the onChange event

I currently have a dropdown list with two values and I am looking to enable or disable four components based on the user's selection. If the user picks the first value, the components should be enabled, otherwise they should be disabled. On the main ...

javascriptajaxjspspring-mvconchange

Managing the sequence of module loading in NodeJS

Consider this scenario: There are 3 files (modules) involved: app.js (async () => { await connectoDB(); let newRec = new userModel({ ...someprops }); await newRec.save(); })(); The app.ts serves as the entry point of the project. database ...

javascriptnode.jstypescriptmongoose

A ReactJS Error occurred: {error: 400, reason: "Failed match", message: "Failed match [400]", errorType: "Meteor.Error"}

I encountered an issue while attempting to send form data to the server when clicking on the Next Button in a Wizard Form. The error that occurs is related to an "Undefined User" warning displayed in the Console during Step 1 of the form submission: " { ...

javascriptreactjsmongodbmeteorredux

Trouble with jQuery dialog not triggering when Enter key is pressed

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script> <form action="" id="formID" name="formID" > <input type="text" id="filename" class="validate[required]"/> <script type="text/ja ...

javascriptjqueryhtml

How can I verify if a user is logged in using express.Router middleware?

Is there a way to incorporate the isLoggedIn function as a condition in a get request using router.route? const controller = require('./controller'); const Router = require('express').Router; const router = new Router(); function isLo ...

javascriptnode.jsexpressauthenticationroutes

highlight the selected option in the ng-repeat list of items

Looking for some assistance with a coding problem I'm having. I keep running into an error when trying to make a selected item in an ng-repeat list highlight. The CSS style is only applied on the second click, not the first. Additionally, I need to en ...

javascripthtmlcssangularjs

Guide to parsing JSONP information using Express

I am attempting to transfer data from phonegap to an express application. Below is the code I am using: Phonegap: $.ajax({ type: 'POST', url:"http://127.0.0.1:3000/test", data: {"test":"this works!"}, dataTyp ...

javascriptjsonnode.jscordovaexpress

Adding default values to a Vuejs data property

My goal is to populate the predefined data property that I have set. reportGroupData: [ { program_name: "", iteration_name: "", report_template_name: "", toggle: true, report_details: [], }, ] This po ...

javascriptarraysvue.js

Building an Ionic Angular application that converts milliseconds to DateTime values retrieved from local storage

I have a mobile app built using Ionic framework where I retrieve data from local storage. My goal is to convert the milliseconds into a readable date format. I have tried the code below but it's not giving me the desired output. Can you please point ...

javascripthtmlangularjsionic-framework

JSON function invocation is failing to load

This is my JavaScript script, When I call the function calculate(), the JSON method ConvertDataTabletoString() only gets called once, when I load the page. I want the method to be called every 5 seconds. I am calling a VB.NET function in .aspx. How can ...

javascriptasp.netjsongoogle-mapsgoogle-maps-api-3

What is the process for updating a placeholder text after the user makes a guess or enters

My latest project involves creating a fun guessing game where players have to identify the driver based on the teams they have driven for. The game displays the number of guesses allowed and keeps track of how many attempts the player has made so far. For ...

javascripthtmlplaceholder

"Is there a virtual keyboard available that supports multiple inputs and automatically switches to the next input when the maximum length

Looking to build a virtual keyboard with multiple inputs that automatically switch to the next input field after reaching the maximum length. Currently having an issue where I can only fill the first input and not the second one. Any assistance in resolvin ...

javascripthtmljqueryajax

Field for user input featuring a button to remove the entry

I am attempting to add a close icon to a bootstrap 3 input field, positioned on the top right of the input. Here is what I have tried so far: https://jsfiddle.net/8konLjur/ However, there are two issues with this approach: The placement of the × ...

javascriptjqueryhtmlcsstwitter-bootstrap

What are the recommended methods for injecting db and logger into routes in an Express application?

When working with Express and needing to pass single instance references like a logger or database to routes, I have come across three options. The first option is to attach it to the request object through a middleware: app.use(function(req,res,next){ re ...

javascriptnode.jsexpressdesign-patternsroutes

Showing the output variable from node.js on a canvas

Is it possible to display the output of my node.js program, which consists of a series of points (x,y), on canvas without a browser? I came across this module that could potentially help with displaying the points: (https://www.npmjs.com/package/canvas) ...

javascriptnode.jscanvas