[英]Image Loading detecting using Javascript
我的網站上有很多圖片(分為 5 個類別),因此加載速度很慢。
I set every image with Attribute "data-src" containing its real source, and I update its source attribute with this "data-src" attribute for every image in this categroy (inside a for loop), whenever the relevant category is chosen (點擊)。
HTML:
<img loading="lzay" class="post_image" data-src="https://i.ibb.co/FswR5KB/Pics-Art-06-22-07-48-49.jpg" src="https://i.ibb.co/FswR5KB/Pics-Art-06-22-07-48-49.jpg">
JAVASCRIPT:
for(i = 0; i< selection.length; i++){
let data_src = selection[i].children[2].getAttribute("data-src");;
selection[i].children[2].src = data_src;
}
我如何判斷一個類別的所有圖像何時加載到站點? (一些代碼在 for 循環完成后繼續運行,但並非所有圖像都已加載,我希望代碼的 rest 只有在它們加載到頁面后才會觸發)。
試試這個。 我沒有太多時間想出它,但它可能會奏效。 抱歉,如果沒有。
index.html
<img id="img1" src="https://i.ibb.co/FswR5KB/Pics-Art-06-22-07-48-49.jpg"/>
<img id="img2" src="https://i.ibb.co/FswR5KB/Pics-Art-06-22-07-48-49.jpg"/>
<img id="img3" src="https://i.ibb.co/FswR5KB/Pics-Art-06-22-07-48-49.jpg"/>
<script type="text/javascript" src="script.js"></script>
腳本.js
const img1 = document.getElementById("img1");
const img2 = document.getElementById("img2");
const img3 = document.getElementById("img3");
const imgArray = [
img1,
img2,
img3
]
let imgsLoaded = 0;
for (let i = 0; i < imgArray.length; i++) {
imgArray[i].onload = function () {
imgsLoaded++;
}
if (imgsLoaded >= imgArray.length) {
// all images are loaded
}
}
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