[英]JS detect image element src change and loaded
我正在建立帶有圖片庫的作品集網站。 通過更改圖像元素的src和alt來加載活動的畫廊圖像,而不是加載新的圖像元素並刪除舊的圖像元素。
除了活動圖像更改時的加載圖標外,我一切正常。 我嘗試使用Javascript在單擊縮略圖時顯示圖標,然后將其隱藏在onLoad上,但這不起作用。
任何人都可以建議如何最好地檢測圖像src何時更改並且新圖像src已完全加載嗎? 如果有幫助,我已在下面復制了完整的JS。 加載程序圖標的功能在最底部。
我正在使用基本的JavaScript,因此理想情況下,如果可能的話,希望遠離任何jQuery解決方案。 謝謝!
var galleryCloseIcon = document.getElementById('galleryClose');
var galleryLoader = document.getElementById('galleryLoader');
var galleryNext = document.getElementById('galleryNext');
var galleryPrevious = document.getElementById('galleryPrevious');
var galleryViewer = document.getElementById('galleryViewer');
var galleryViewerBg = document.getElementById('galleryViewerBg');
var galleryViewerExpand = document.getElementById('galleryViewerExpand');
var galleryViewerImage = document.getElementById('galleryViewerImage');
var imageNodes = document.querySelectorAll('.gallery__image');
var imageIndex = 0;
//Loop through images to find image index
var indexLoop = function() {
for (var i = 0; i < imageNodes.length; i++) {
var thumbimage = imageNodes[i].src.split("-thm")[0] + ".jpg";
if (thumbimage === galleryViewerImage.src) {
imageIndex = i;
}
}
};
// Open Gallery
var galleryOpen = function() {
// Open gallery viewer
galleryViewer.classList.add('gallery__viewer--open');
indexLoop();
};
// Open gallery fullscreen on desktop
var galleryOpenDesk = function() {
galleryViewer.classList.add('gallery__viewer--open-desk');
};
// Close gallery
var galleryClose = function() {
galleryViewer.classList.remove('gallery__viewer--open');
galleryViewer.classList.remove('gallery__viewer--open-desk');
};
// Get image data
var imageData = function(item) {
imageLoader(item);
galleryViewerImage.alt = item.alt;
// Get image src by removing -thm suffix from thumbnails
var galleryViewerLarge = item.src.split("-thm")[0] + ".jpg";
galleryViewerImage.src = galleryViewerLarge;
};
// Functions for image event listeners
var imageClick = function() {
var $this = this;
imageData($this);
galleryOpen();
};
// Add event listeners to images
for (var i = imageIndex; i < imageNodes.length; i++) {
imageNodes[i].addEventListener("click", imageClick);
}
// Next / previous buttons
var changeImage = function(n) {
if (n > imageNodes.length -1) {
imageIndex = 0;
} else if (n < 0) {
imageIndex = imageNodes.length -1;
} else {
imageIndex = n;
}
imageData(imageNodes[imageIndex]);
return imageIndex;
};
var imageNext = function() {
changeImage(imageIndex + 1);
};
var imagePrevious = function() {
changeImage(imageIndex -1);
};
// Loading image spinner
var imageLoader = function(image) {
galleryLoader.classList.add('gallery__viewer-icon--loader-on');
image.onload = function() {
galleryLoader.classList.remove('gallery__viewer-icon--loader-on');
};
};
弄清楚了。 我沒有檢查活動映像是否已加載,而是在檢查節點是否已加載。 如果任何人都可以使用它,則加載程序功能應該就是這個;
var imageLoader = function(image) {
galleryLoader.classList.add('gallery__viewer-icon--loader-on');
galleryViewerImage.onload = function() {
galleryLoader.classList.remove('gallery__viewer-icon--loader-on');
};
};
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