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Code Issues Releases Activity

Improve/fix querySelector usage

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Federico Brigante 2017-12-16 17:39:40 +08:00 committed by GitHub
parent ed675b91dd
commit fd25d28997
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1 changed files with 9 additions and 11 deletions
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20
content.js
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@ -5,23 +5,23 @@
var makeReadable = function() { var makeReadable = function() {
// Un-position:fixed the top nav bar // Un-position:fixed the top nav bar
var topNav = document.querySelector('.metabar.u-fixed'); var topNav = document.querySelector('.metabar.u-fixed');
if (topNav != null) { if (topNav) {
topNav.classList.remove('u-fixed'); topNav.classList.remove('u-fixed');
} }
// Remove the footer // Remove the footer
var getUpdatesBar = document.querySelector('.js-stickyFooter'); var getUpdatesBar = document.querySelector('.js-stickyFooter');
if (getUpdatesBar != null) { if (getUpdatesBar) {
getUpdatesBar.style.display = 'none'; getUpdatesBar.style.display = 'none';
} }
}; };
var hideDickbar = function() { var hideDickbar = function() {
var dickbar = document.querySelector('.js-postShareWidget'); var dickbar = document.querySelector('.js-postShareWidget');
if (dickbar != null) { if (dickbar) {
dickbar.style.display = 'none'; dickbar.style.display = 'none';
} }
var footerDickbar = document.querySelector('footer > .container:first-child'); var footerDickbar = document.querySelector('footer > .container:first-child');
if (footerDickbar != null) { if (footerDickbar) {
footerDickbar.style.display = 'none'; footerDickbar.style.display = 'none';
} }
}; };
@ -29,14 +29,14 @@ var hideDickbar = function() {
var disableLazyLoading = function() { var disableLazyLoading = function() {
// Get all <noscript> tags accompanying dynamically-loading <img>s // Get all <noscript> tags accompanying dynamically-loading <img>s
var hiddenMedia = document.querySelectorAll('noscript.js-progressiveMedia-inner'); var hiddenMedia = document.querySelectorAll('noscript.js-progressiveMedia-inner');
if (hiddenMedia == null) { if (hiddenMedia.length === 0) {
return; return;
} }
for (var i=0; i<hiddenMedia.length; i++) { for (var i=0; i<hiddenMedia.length; i++) {
// Create new <img> element from the one in <noscript> and add it in. // Create new <img> element from the one in <noscript> and add it in.
// This is certainly a roundabout way of doing things, but I didn't want to // This is certainly a roundabout way of doing things, but I didn't want to
// spend more time reverse-engineering Medium's lazy-loading code. // spend more time reverse-engineering Medium's lazy-loading code.
var img = document.createElement('img'); var img = new Image();
var srcMatch = hiddenMedia[i].textContent.match(/src="(https:\/\/[^"]+)"/); var srcMatch = hiddenMedia[i].textContent.match(/src="(https:\/\/[^"]+)"/);
if (srcMatch != null) { if (srcMatch != null) {
img.src = srcMatch[1]; img.src = srcMatch[1];
@ -48,7 +48,7 @@ var disableLazyLoading = function() {
var shrinkHeaderImages = function() { var shrinkHeaderImages = function() {
var ridiculousHeaderImage = document.querySelector('figure.graf--layoutFillWidth'); var ridiculousHeaderImage = document.querySelector('figure.graf--layoutFillWidth');
if (ridiculousHeaderImage != null) { if (ridiculousHeaderImage) {
ridiculousHeaderImage.style.maxWidth = '700px'; ridiculousHeaderImage.style.maxWidth = '700px';
ridiculousHeaderImage.style.margin = '0 auto'; ridiculousHeaderImage.style.margin = '0 auto';
} }
@ -64,9 +64,7 @@ var observer = new MutationObserver(function(mutations){
var config = {attributes: true}; var config = {attributes: true};
// Only run this on Medium sites. // Only run this on Medium sites.
// Ensure that by checking for <meta property="al:ios:app_name" content="Medium"> in the document <head /> if (document.querySelector('head meta[property="al:ios:app_name"][content="medium"]')) {
var metaCheck = document.head.querySelector('meta[property="al:ios:app_name"]');
if (metaCheck != null && metaCheck.content == "Medium") {
makeReadable(); makeReadable();
shrinkHeaderImages(); shrinkHeaderImages();
@ -79,5 +77,5 @@ if (metaCheck != null && metaCheck.content == "Medium") {
} }
}); });
observer.observe(document.querySelector('body'), config); observer.observe(document.body, config);
} }