Guard against null element in isInViewport

philwebb · philwebb · commit c409a940c6bb · 2021-03-10T16:03:30.000-08:00
Closes gh-17
diff --git a/src/main/js/site/toc.js b/src/main/js/site/toc.js
@@ -224,6 +224,9 @@
   }
 
   function isInViewport(element) {
+    if(!element) {
+      return false;
+    }
     const rect = element.getBoundingClientRect();
     return (
       rect.top >= 0 &&

Original file line number	Diff line number	Diff line change
`@@ -224,6 +224,9 @@`
`224`	`224`	`}`
`225`	`225`
`226`	`226`	`function isInViewport(element) {`
	`227`	`+ if(!element) {`
	`228`	`+ return false;`
	`229`	`+ }`
`227`	`230`	`const rect = element.getBoundingClientRect();`
`228`	`231`	`return (`
`229`	`232`	`rect.top >= 0 &&`