Add event listeners passive for fotorama lib improves lighthouse metrics

mrtuvn · mrtuvn · commit 67c2c71ab57c · 2020-11-27T22:26:29.000+07:00
diff --git a/lib/web/fotorama/fotorama.js b/lib/web/fotorama/fotorama.js
@@ -1137,7 +1137,7 @@ fotoramaVersion = '4.6.4';
 
     function addEvent(el, e, fn, bool) {
         if (!e) return;
-        el.addEventListener ? el.addEventListener(e, fn, !!bool) : el.attachEvent('on' + e, fn);
+        el.addEventListener ? el.addEventListener(e, fn, {passive: true}) : el.attachEvent('on' + e, fn);
     }
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -1137,7 +1137,7 @@ fotoramaVersion = '4.6.4';`
`1137`	`1137`
`1138`	`1138`	`function addEvent(el, e, fn, bool) {`
`1139`	`1139`	`if (!e) return;`
`1140`		`- el.addEventListener ? el.addEventListener(e, fn, !!bool) : el.attachEvent('on' + e, fn);`
	`1140`	`+ el.addEventListener ? el.addEventListener(e, fn, {passive: true}) : el.attachEvent('on' + e, fn);`
`1141`	`1141`	`}`
`1142`	`1142`
`1143`	`1143`	`/**`