Mercurial > addons > firefox-addons > feed-preview

annotate content_scripts/feed-readers.js @ 54:ede87e1004f9

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Fix issues with feed detection Query the feed probe content script for available feeds from the background script instead of making the content script message the background script. This solves a race condition between the message from the content script sending any feeds associated with the current document and the tab's status "complete" event signaling that a new document has been loaded and hiding the page action. Sometimes that event would be triggered after the message from the content script and thus hide the page action again. In addition, navigating back to a previously visited page might not cause a reload which means that the content script would not send a message if there were feeds associated with the current document.
author Guido Berhoerster <guido+feed-preview@berhoerster.name>
date Thu, 26 Sep 2019 23:11:18 +0200
parents ff5e5e3eba32
children
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1 /*
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2 * Copyright (C) 2018 Guido Berhoerster <guido+feed-preview@berhoerster.name>
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3 *
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4 * This Source Code Form is subject to the terms of the Mozilla Public
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5 * License, v. 2.0. If a copy of the MPL was not distributed with this
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6 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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7 */
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8
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9 'use strict';
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11 function updateFeedReaders(feedReaders) {
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12 let feedReaderSelectionElement = document.forms['feed-subscription']
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13 .elements['feed-reader-selection'];
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14 for (let optionElement of
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15 feedReaderSelectionElement.querySelectorAll('option')) {
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16 optionElement.remove();
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17 }
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19 for (let feedReader of feedReaders) {
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20 let optionElement = document.createElement('option');
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21 optionElement.value = feedReader.urlTemplate;
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22 optionElement.textContent = feedReader.title;
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23 feedReaderSelectionElement.append(optionElement);
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24 }
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26 document.forms['feed-subscription'].elements['main'].disabled =
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27 feedReaders.length === 0;
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28 }
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30 document.addEventListener('submit', ev => {
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31 if (ev.target.id !== 'feed-subscription') {
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32 return;
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33 }
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35 ev.preventDefault();
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36 let subscribeUrl = ev.target.elements['feed-reader-selection'].value
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37 .replace('%s', encodeURIComponent(document.documentURI));
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38 console.log(`subscribing to feed using ${subscribeUrl}`);
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39 window.location.href = subscribeUrl;
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40 });
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41
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42 function onStorageChanged(changes, areaName) {
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43 if (areaName !== 'sync' || changes.feedReaders === 'undefined') {
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44 return;
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45 }
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46
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47 // stored feed readers have been changed or deleted
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48 let feedReaders = typeof changes.feedReaders.newValue !== 'undefined' ?
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49 changes.feedReaders.newValue : [];
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50 console.log('feedReaders changed to', feedReaders);
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51 updateFeedReaders(feedReaders);
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52 }
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54 (async () => {
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55 // initialize subscription form
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56 let {feedReaders = []} = await browser.storage.sync.get('feedReaders');
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57 updateFeedReaders(feedReaders);
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58
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59 browser.storage.onChanged.addListener(onStorageChanged);
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60 })();