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<title>[50269] trunk/src/wp-content/themes/twentytwentyone/assets/js/dark-mode-toggler.js: Twenty Twenty-One: Prevent Dark Mode related JavaScript error.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/50269">50269</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/50269","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>desrosj</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2021-02-09 14:54:48 +0000 (Tue, 09 Feb 2021)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Twenty Twenty-One: Prevent Dark Mode related JavaScript error.
This prevents an `Uncaught TypeError` in the block editor when scrolling caused by the absence of a `#dark-mode-toggler` element.
Props ocean90, mukesh27, justinahinon.
Fixes <a href="https://core.trac.wordpress.org/ticket/52473">#52473</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpcontentthemestwentytwentyoneassetsjsdarkmodetogglerjs">trunk/src/wp-content/themes/twentytwentyone/assets/js/dark-mode-toggler.js</a></li>
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<h3>Diff</h3>
<a id="trunksrcwpcontentthemestwentytwentyoneassetsjsdarkmodetogglerjs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-content/themes/twentytwentyone/assets/js/dark-mode-toggler.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-content/themes/twentytwentyone/assets/js/dark-mode-toggler.js 2021-02-09 14:15:50 UTC (rev 50268)
+++ trunk/src/wp-content/themes/twentytwentyone/assets/js/dark-mode-toggler.js 2021-02-09 14:54:48 UTC (rev 50269)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -44,7 +44,9 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> function darkModeRepositionTogglerOnScroll() {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- var prevScroll = window.scrollY || document.documentElement.scrollTop,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ var toggler = document.getElementById( 'dark-mode-toggler' ),
+ prevScroll = window.scrollY || document.documentElement.scrollTop,
</ins><span class="cx" style="display: block; padding: 0 10px"> currentScroll,
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> checkScroll = function() {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -53,13 +55,16 @@
</span><span class="cx" style="display: block; padding: 0 10px"> currentScroll + ( window.innerHeight * 1.5 ) > document.body.clientHeight ||
</span><span class="cx" style="display: block; padding: 0 10px"> currentScroll < prevScroll
</span><span class="cx" style="display: block; padding: 0 10px"> ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- document.getElementById( 'dark-mode-toggler' ).classList.remove( 'hide' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ toggler.classList.remove( 'hide' );
</ins><span class="cx" style="display: block; padding: 0 10px"> } else if ( currentScroll > prevScroll && 250 < currentScroll ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- document.getElementById( 'dark-mode-toggler' ).classList.add( 'hide' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ toggler.classList.add( 'hide' );
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> prevScroll = currentScroll;
</span><span class="cx" style="display: block; padding: 0 10px"> };
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- window.addEventListener( 'scroll', checkScroll );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ if ( toggler ) {
+ window.addEventListener( 'scroll', checkScroll );
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> darkModeInitialLoad();
</span></span></pre>
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