57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
export default () => {
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//*** Determine whether or not the PWA has been installed. ***//
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// Step 1: Check local storage
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let pwaInstalled = localStorage.getItem("pwaInstalled") === "yes";
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// Step 2: Check if the display-mode is standalone. (Only permitted for PWAs.)
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if (
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!pwaInstalled &&
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window.matchMedia("(display-mode: standalone)").matches
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) {
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localStorage.setItem("pwaInstalled", "yes");
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pwaInstalled = true;
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}
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// Step 3: Check if the navigator is in standalone mode. (Again, only permitted for PWAs.)
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if (!pwaInstalled && window.navigator.standalone === true) {
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localStorage.setItem("pwaInstalled", "yes");
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pwaInstalled = true;
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}
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//*** If the PWA has not been installed, show the install PWA prompt.. ***//
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let deferredPrompt = null;
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window.addEventListener("beforeinstallprompt", event => {
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deferredPrompt = event;
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// Show the install button if the prompt appeared.
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if (!pwaInstalled) {
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document.querySelector("#installPWA").style.display = "inline-flex";
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}
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});
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// When the app is installed, remove install prompts.
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window.addEventListener("appinstalled", event => {
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localStorage.setItem("pwaInstalled", "yes");
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pwaInstalled = true;
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document.getElementById("installPWA").style.display = "none";
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});
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// When the app is uninstalled, add the prompts back
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return async () => {
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if (deferredPrompt) {
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deferredPrompt.prompt();
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let outcome = await deferredPrompt.userChoice;
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if (outcome === "accepted") {
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console.log("Postwoman was installed successfully.");
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} else {
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console.log(
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"Postwoman could not be installed. (Installation rejected by user.)"
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);
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}
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deferredPrompt = null;
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}
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};
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};
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