PWA cheat sheet

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February 4, 2021

7:02 pm

144 Comments on PWA cheat sheet

Javascript

index.html

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta name="theme-color" content="#009578">
        <title>PWA</title>
        <link rel="stylesheet" href="src/master.css">
        <link rel="manifest" href="manifest.json">
        <link rel="apple-touch-icon" href="images/logo_2.jpg">
    </head>
    <body>
        <h3>Progressive Web App</h3>
        <script src="src/index.js"></script>
        <h4>Addition</h4>

    <label for="num1">Enter 1st Number:</label><br>
    <input type="text" id="num1" name="num1"><br>
    <br>

    <label for="num2">Enter 2nd Number:</label><br>
    <input type="text" id="num2" name="num2"><br><br>

    <button type="button" name="button" onclick="addition()">Add</button>

    <div>
        <h4>Result: <span id="res"> </span></h4>
    </div>

    <script>
        function addition() {
            var x = parseInt(document.getElementById("num1").value);
            var y = parseInt(document.getElementById("num2").value);

            var z = x + y;

            document.getElementById("res").innerHTML = z;
        }
    </script>

    </body>
</html>

manifest.json

{
    "name": "PWA demo",
    "short_name": "PWA",
    "start_url": ".",
    "background_color": "#6dcdb1",
    "theme_color": "#009578",
    "display": "standalone",
    "icons": [
        {
            "src": "images/logo_2.jpg",
            "sizes": "512x512",
            "type": "image/jpg"
        },
        {
            "src": "images/logo_1.png",
            "sizes": "512x512",
            "type": "image/png"
        }
    ]
}

sw.js

self.addEventListener("install", e => {
    // console.log("Install decode!");
    e.waitUntil(
        caches.open("static").then(cache => {
            return cache.addAll(["./", "./src/master.css", "./images/logo_2.jpg"]);
        })
    );
});


self.addEventListener("fetch", e => {
    // console.log(`Intercepting fetch request for: ${e.request.url}`);
    e.respondWith(
        caches.match(e.request).then(response => {
            return response || fetch(e.request);
        })
    );
});

src/index.js

if ("serviceWorker" in navigator) {
    navigator.serviceWorker.register("sw.js").then(registration => {
        console.log("SW Registered!");
        console.log(registration);
    }).catch(error => {
        console.log("SW Registration failed!");
        console.log(error);
    })
}

src/master.css

body {
    background: #eeeeee;
}

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