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tweaks and tests for #2354

Hakim El Hattab 5 years ago
parent
6faab091bb
commit
d6f0f41f77
3 changed files with 123 additions and 26 deletions
Split View Show Diff Stats
  1. 1 1
      README.md
  2. 14 25
      js/reveal.js
  3. 108 0
      test/test-iframes.html

+ 1 - 1
README.md
View File 

@@ -316,7 +316,7 @@ Reveal.initialize({
 
 	// - false: No media will autoplay, regardless of individual setting
 
 	autoPlayMedia: null,
 
 
-  // Global override for preloading lazy-loaded iframes
 
+	// Global override for preloading lazy-loaded iframes
 
 	// - null: Iframes with data-src AND data-preload will be loaded when within
 
 	//   the viewDistance, iframes with only data-src will be loaded when visible
 
 	// - true: All iframes with data-src will be loaded when within the viewDistance

+ 14 - 25
js/reveal.js
View File 

@@ -180,6 +180,13 @@
 
 			// - false:  No media will autoplay, regardless of individual setting
 
 			autoPlayMedia: null,
 
 
+			// Global override for preloading lazy-loaded iframes
 
+			// - null:   Iframes with data-src AND data-preload will be loaded when within
 
+			//           the viewDistance, iframes with only data-src will be loaded when visible
 
+			// - true:   All iframes with data-src will be loaded when within the viewDistance
 
+			// - false:  All iframes with data-src will be loaded only when visible
 
+			preloadIframes: null,
 
+
 
 			// Controls automatic progression to the next slide
 
 			// - 0:      Auto-sliding only happens if the data-autoslide HTML attribute
 
 			//           is present on the current slide or fragment
 
@@ -3677,7 +3684,7 @@
 
 	 *
 
 	 * @param {HTMLElement} element
 
 	 */
 
-	function shouldPreload(element) {
 
+	function shouldPreload( element ) {
 
 
 		// Prefer an explicit global preload setting
 
 		var preload = config.preloadIframes;
 
@@ -3707,18 +3714,10 @@
 
 
 		// Media elements with data-src attributes
 
 		toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
 
-			var load = function( el ) {
 
-				el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
 
-				el.setAttribute( 'data-lazy-loaded', '' );
 
-				el.removeAttribute( 'data-src' );
 
-			};
 
-
 
-			if( element.tagName === 'IFRAME') {
 
-				if( shouldPreload(element) ) {
 
-					load(element);
 
-				}
 
-			} else {
 
-				load(element);
 
+			if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
 
+				element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
 
+				element.setAttribute( 'data-lazy-loaded', '' );
 
+				element.removeAttribute( 'data-src' );
 
 			}
 
 		} );
 
 
@@ -3838,18 +3837,8 @@
 
 
 		// Reset lazy-loaded media elements with src attributes
 
 		toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ) ).forEach( function( element ) {
 
-			var unload = function( el ) {
 
-				el.setAttribute( 'data-src', el.getAttribute( 'src' ) );
 
-				el.removeAttribute( 'src' );
 
-			};
 
-
 
-			if( element.tagName === 'IFRAME' ) {
 
-				if( shouldPreload(element) ) {
 
-					unload(element);
 
-				}
 
-			} else {
 
-				unload(element);
 
-			}
 
+			element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
 
+			element.removeAttribute( 'src' );
 
 		} );
 
 
 		// Reset lazy-loaded media elements with <source> children

+ 108 - 0
test/test-iframes.html
View File 

@@ -0,0 +1,108 @@
 
+<!doctype html>
 
+<html lang="en">
 
+
 
+	<head>
 
+		<meta charset="utf-8">
 
+
 
+		<title>reveal.js - Test Iframes</title>
 
+
 
+		<link rel="stylesheet" href="../css/reveal.css">
 
+		<link rel="stylesheet" href="qunit-2.5.0.css">
 
+	</head>
 
+
 
+	<body style="overflow: auto;">
 
+
 
+		<div id="qunit"></div>
 
+		<div id="qunit-fixture"></div>
 
+
 
+		<div class="reveal" style="display: none;">
 
+
 
+			<div class="slides">
 
+
 
+				<section>1</section>
 
+				<section>2</section>
 
+				<section>
 
+					<iframe class="default-iframe" data-src="#"></iframe>
 
+					<iframe class="preload-iframe" data-src="#" data-preload></iframe>
 
+				</section>
 
+
 
+			</div>
 
+
 
+		</div>
 
+
 
+		<script src="../js/reveal.js"></script>
 
+		<script src="qunit-2.5.0.js"></script>
 
+
 
+		<script>
 
+
 
+
 
+			Reveal.addEventListener( 'ready', function() {
 
+
 
+				var defaultIframe = document.querySelector( '.default-iframe' ),
 
+					preloadIframe = document.querySelector( '.preload-iframe' );
 
+
 
+				QUnit.module( 'Iframe' );
 
+
 
+				QUnit.test( 'Using default settings', function( assert ) {
 
+
 
+					Reveal.slide(1);
 
+					assert.strictEqual( defaultIframe.hasAttribute( 'src' ), false, 'not preloaded when within viewDistance' );
 
+
 
+					Reveal.slide(2);
 
+					assert.strictEqual( defaultIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
 
+
 
+					Reveal.slide(1);
 
+					assert.strictEqual( defaultIframe.hasAttribute( 'src' ), false, 'unloaded when slide becomes invisible' );
 
+
 
+				});
 
+
 
+				QUnit.test( 'Using data-preload', function( assert ) {
 
+
 
+					Reveal.slide(1);
 
+					assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
 
+
 
+					Reveal.slide(2);
 
+					assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'loaded when slide becoems visible' );
 
+
 
+					Reveal.slide(0);
 
+					assert.strictEqual( preloadIframe.hasAttribute( 'src' ), false, 'unloads outside of viewDistance' );
 
+
 
+				});
 
+
 
+				QUnit.test( 'Using preloadIframes: true', function( assert ) {
 
+
 
+					Reveal.configure({ preloadIframes: true });
 
+
 
+					Reveal.slide(1);
 
+					assert.strictEqual( defaultIframe.hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
 
+					assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
 
+
 
+					Reveal.slide(2);
 
+					assert.strictEqual( defaultIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
 
+					assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
 
+
 
+				});
 
+
 
+				QUnit.test( 'Using preloadIframes: false', function( assert ) {
 
+
 
+					Reveal.configure({ preloadIframes: false });
 
+
 
+					Reveal.slide(0);
 
+					assert.strictEqual( defaultIframe.hasAttribute( 'src' ), false, 'not preloaded within viewDistance' );
 
+					assert.strictEqual( preloadIframe.hasAttribute( 'src' ), false, 'not preloaded within viewDistance' );
 
+
 
+					Reveal.slide(2);
 
+					assert.strictEqual( defaultIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
 
+					assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
 
+
 
+				});
 
+
 
+			} );
 
+
 
+			Reveal.initialize({
 
+				viewDistance: 2
 
+			});
 
+		</script>
 
+
 
+	</body>
 
+</html>