Javascript JS检测图像元素src更改并加载
我正在建立一个带有图片库的投资组合网站。通过更改image元素的src和alt来加载活动的gallery图像,而不是加载新的image元素并删除旧的image元素 我已经让一切工作,除了加载图标时,活动图像的变化。我曾尝试使用Javascript在单击缩略图时显示图标,然后在加载时隐藏它,但这不起作用 有谁能建议如何最好地检测图像src何时已更改,以及新图像src何时已完全加载?如果有帮助的话,我已经在下面复制了我的完整JS。加载器图标的功能位于最底部 我使用的是基本的JavaScript,所以如果可能的话,我希望远离任何jQuery解决方案。谢谢Javascript JS检测图像元素src更改并加载,javascript,Javascript,我正在建立一个带有图片库的投资组合网站。通过更改image元素的src和alt来加载活动的gallery图像,而不是加载新的image元素并删除旧的image元素 我已经让一切工作,除了加载图标时,活动图像的变化。我曾尝试使用Javascript在单击缩略图时显示图标,然后在加载时隐藏它,但这不起作用 有谁能建议如何最好地检测图像src何时已更改,以及新图像src何时已完全加载?如果有帮助的话,我已经在下面复制了我的完整JS。加载器图标的功能位于最底部 我使用的是基本的JavaScript,所以
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');
};
};
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\uuuu image');
var指数=0;
//循环浏览图像以查找图像索引
var indexLoop=函数(){
对于(var i=0;iimageNodes.length-1){
imageIndex=0;
}else if(n<0){
imageIndex=imageNodes.length-1;
}否则{
imageIndex=n;
}
imageData(imageNodes[imageIndex]);
返回图像索引;
};
var imageNext=函数(){
changeImage(图像索引+1);
};
var imagePrevious=函数(){
changeImage(图像索引-1);
};
//加载图像微调器
var imageLoader=函数(图像){
galleryLoader.classList.add('gallery_uuViewer-icon--loader on');
image.onload=函数(){
galleryLoader.classList.remove('gallery_uuViewer-icon--loader on');
};
};
找到了答案。我没有检查活动映像是否已加载,而是检查节点是否已加载。如果它对任何人都有用,那么加载函数应该是这样的
var imageLoader = function(image) {
galleryLoader.classList.add('gallery__viewer-icon--loader-on');
galleryViewerImage.onload = function() {
galleryLoader.classList.remove('gallery__viewer-icon--loader-on');
};
};