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https://github.com/mdn/webextensions-examples.git
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82217a05bc
* Replace var with let in examples store-collected-images/webextension-plain/deps/uuidv4.js * Reverted third–party code
75 lines
2.0 KiB
JavaScript
75 lines
2.0 KiB
JavaScript
/*
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DELAY is set to 6 seconds in this example. Such a short period is chosen to make
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the extension's behavior more obvious, but this is not recommended in real life.
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Note that in Chrome, alarms cannot be set for less than a minute. In Chrome:
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* if you install this extension "unpacked", you'll see a warning
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in the console, but the alarm will still go off after 6 seconds
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* if you package the extension and install it, then the alarm will go off after
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a minute.
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*/
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let DELAY = 0.1;
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let CATGIFS = "https://giphy.com/explore/cat";
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/*
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Restart alarm for the currently active tab, whenever background.js is run.
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*/
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let gettingActiveTab = browser.tabs.query({active: true, currentWindow: true});
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gettingActiveTab.then((tabs) => {
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restartAlarm(tabs[0].id);
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});
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/*
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Restart alarm for the currently active tab, whenever the user navigates.
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*/
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browser.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
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if (!changeInfo.url) {
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return;
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}
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let gettingActiveTab = browser.tabs.query({active: true, currentWindow: true});
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gettingActiveTab.then((tabs) => {
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if (tabId == tabs[0].id) {
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restartAlarm(tabId);
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}
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});
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});
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/*
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Restart alarm for the currently active tab, whenever a new tab becomes active.
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*/
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browser.tabs.onActivated.addListener((activeInfo) => {
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restartAlarm(activeInfo.tabId);
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});
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/*
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restartAlarm: clear all alarms,
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then set a new alarm for the given tab.
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*/
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function restartAlarm(tabId) {
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browser.pageAction.hide(tabId);
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browser.alarms.clearAll();
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let gettingTab = browser.tabs.get(tabId);
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gettingTab.then((tab) => {
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if (tab.url != CATGIFS) {
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browser.alarms.create("", {delayInMinutes: DELAY});
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}
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});
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}
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/*
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On alarm, show the page action.
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*/
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browser.alarms.onAlarm.addListener((alarm) => {
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let gettingActiveTab = browser.tabs.query({active: true, currentWindow: true});
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gettingActiveTab.then((tabs) => {
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browser.pageAction.show(tabs[0].id);
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});
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});
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/*
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On page action click, navigate the corresponding tab to the cat gifs.
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*/
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browser.pageAction.onClicked.addListener(() => {
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browser.tabs.update({url: CATGIFS});
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});
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