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Code Issues Releases Wiki Activity

Image lazy loading (#6809)

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* Extend image widget with lazy loading support

* docs: added from-version to docs update
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Saq Imtiaz 2022-07-21 16:30:56 +02:00 committed by GitHub
parent 39996c7a2f
commit 613b3df367
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2 changed files with 10 additions and 4 deletions
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4
core/modules/widgets/image.js
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@ -111,6 +111,9 @@ ImageWidget.prototype.render = function(parent,nextSibling) {
if(this.imageAlt) {
domNode.setAttribute("alt",this.imageAlt);
}
if(this.lazyLoading && tag === "img") {
domNode.setAttribute("loading",this.lazyLoading);
}
// Add classes when the image loads or fails
$tw.utils.addClass(domNode,"tc-image-loading");
domNode.addEventListener("load",function() {
@ -137,6 +140,7 @@ ImageWidget.prototype.execute = function() {
this.imageClass = this.getAttribute("class");
this.imageTooltip = this.getAttribute("tooltip");
this.imageAlt = this.getAttribute("alt");
this.lazyLoading = this.getAttribute("loading");
};
/*

10
editions/tw5.com/tiddlers/widgets/ImageWidget.tid
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@ -1,8 +1,9 @@
title: ImageWidget
created: 20140416160234142
modified: 20220101205921813
tags: Widgets
caption: image
created: 20140416160234142
modified: 20220721102303815
tags: Widgets
title: ImageWidget
type: text/vnd.tiddlywiki
! Introduction
@ -19,6 +20,7 @@ Any content of the `<$image>` widget is ignored.
|tooltip |The tooltip to be displayed over the image |
|alt |The alternative text to be associated with the image |
|class |CSS classes to be assigned to the `<img>` element |
|loading|<<.from-version "5.2.3">>Optional. Set to `lazy` to enable lazy loading of images loaded from an external URI |
The width and the height can be specified as pixel values (eg "23" or "23px") or percentages (eg "23%"). They are both optional; if not provided the browser will use CSS rules to size the image.