回答編集履歴
3
追記日時修正
test
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@@ -72,7 +72,7 @@
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-
**(2015/12/02
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**(2015/12/02 07:59追記)**
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ひょっとして実行順も保証したいという意味だったでしょうか。
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2
実行順を保証するコードを追記
test
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@@ -71,3 +71,95 @@
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```
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**(2015/12/02 17:59追記)**
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ひょっとして実行順も保証したいという意味だったでしょうか。
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78
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実行順を保証するコードを追記しました。
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```JavaScript
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'use strict';
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(function () {
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function handleLoad (event) {
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var img = event.target,
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imgList = this.imgList,
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srcList = this.srcList;
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img.removeEventListener('load', this, false);
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imgList[srcList.indexOf(img.getAttribute('src'))] = img;
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if (Object.keys(imgList).length === srcList.length) {
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this.complete(imgList);
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}
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}
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function next (imgList) {
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for (var i = 0, l = imgList.length, img; i < l; ++i) {
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img = imgList[i];
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console.log(img, img.width, img.height);
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}
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}
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function main () {
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var srcList = ['sample1.jpg', 'sample2.jpg', 'sample3.jpg'],
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listener = {
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handleEvent: handleLoad,
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srcList: srcList,
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imgList: [],
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complete: next
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};
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for (var i = 0, l = srcList.length, img; i < l; ++i) {
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img = new Image;
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img.addEventListener('load', listener, false);
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img.src = srcList[i];
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}
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}
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main();
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}());
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```
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1
`load` イベントのサンプルを追記
test
CHANGED
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@@ -2,6 +2,72 @@
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2
2
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3
3
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が、`addEventListener` で `load` を監視したほうが素直ですし、負荷も小さいと思います。
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-
- [HTML Standard](https://html.spec.whatwg.org/multipage/embedded-content.html#the-img-element)
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- [4.8.4 The img element - HTML Standard](https://html.spec.whatwg.org/multipage/embedded-content.html#the-img-element)
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- [HTMLImageElement - Web API インターフェイス | MDN](https://developer.mozilla.org/ja/docs/Web/API/HTMLImageElement)
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**(2015/12/01 19:56追記)**
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`load` イベントのサンプルを追記しました。
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```JavaScript
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'use strict';
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(function () {
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function handleLoad (event) {
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var img = event.target;
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img.removeEventListener('load', this, false);
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this.complete(img);
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}
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function next (img) {
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console.log(img.width, img.height);
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}
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function main () {
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var srcList = ['sample1.jpg', 'sample2.jpg', 'sample3.jpg'],
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listener = {handleEvent: handleLoad, complete: next};
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for (var i = 0, l = srcList.length, img; i < l; ++i) {
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img = new Image;
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img.addEventListener('load', listener, false);
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img.src = srcList[i];
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}
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}
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main();
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}());
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```
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