我设法弄清楚了如何在我的网站上延迟加载图像,通过<img>
标记将图像调用到HTML中。我在GitHub上使用了此软件包来完成此任务。但是我很难用CSS完成相同的事情background:
。
-有关此问题的一些信息:
我昨晚创建了一个图像菜单栏,该菜单栏根据浏览器屏幕(提供的链接)更改图像大小/位置。该图像菜单栏中的所有图像都通过background:
CSS(而不是通过<img>
标签)调用。
-现在我的问题是:
我如何在已经开始background:
的这个项目的CSS中延迟加载图像。在我的网站上,按照上面的Github链接中的说明进行操作后,我将更<img src="">
改为<img data-src=""
(在HTML中),并且图像将在屏幕上可见时加载。
-这样做的原因:
这纯粹是为了加快网站速度,并避免一次加载所有图像。确保此操作不会浪费加载时间的任何其他提示,或者解决此问题的任何其他可能方式,将不胜感激。
-注意:我已经使用过,background:
而不是background-image:
用于该项目。
如果您错过了我项目的链接: https : //jsfiddle.net/Shololom/wbgn210y/
在Github项目中,您提供了:
何时使用:您的图像被设置为CSS背景图像,而不是实际的img,但是您仍然想懒加载它们。
<div class="lazy" data-src="../img/44721746JJ_15_a.jpg"></div>
var myLazyLoad = new LazyLoad({
elements_selector: ".lazy"
});
而已。每当由elements_selector选择的元素不是img或iframe时,LazyLoad会将在data-src属性中找到的图像放在该元素的背景图像中。
// Get products
var product1 = document.getElementById('product1');
var product2 = document.getElementById('product2');
var product3 = document.getElementById('product3');
var product4 = document.getElementById('product4');
var product5 = document.getElementById('product5');
// Create Lazy loader
var myLazyLoad = new LazyLoad({
elements_selector: ".lazy"
});
// Load images in a responsive way
function loadImgs() {
console.log('Loading images ...');
var src1;
var src2;
var src3;
var src4;
var src5;
if(window.matchMedia("only screen and (max-width:700px)").matches) {
/* The viewport is lesser than 700 pixels wide */
src1 = product1.getAttribute('data-src-small');
src2 = product2.getAttribute('data-src-small');
src3 = product3.getAttribute('data-src-small');
src4 = product4.getAttribute('data-src-small');
src5 = product5.getAttribute('data-src-small');
} else {
src1 = product1.getAttribute('data-src-large');
src2 = product2.getAttribute('data-src-large');
src3 = product3.getAttribute('data-src-large');
src4 = product4.getAttribute('data-src-large');
src5 = product5.getAttribute('data-src-large');
}
// Set the data-src for lazy loader
product1.setAttribute('data-src', src1);
product2.setAttribute('data-src', src2);
product3.setAttribute('data-src', src3);
product4.setAttribute('data-src', src4);
product5.setAttribute('data-src', src5);
// Tell lazy loader that the data should be re-processed
product1.removeAttribute('data-was-processed');
product2.removeAttribute('data-was-processed');
product3.removeAttribute('data-was-processed');
product4.removeAttribute('data-was-processed');
product5.removeAttribute('data-was-processed');
// Tell lazy loader to update
myLazyLoad.update();
}
// Load images first time
loadImgs();
// Reload images when window is resized
var lastWindowSize = window.innerWidth;
window.onresize = function(event) {
var currentWindowSize = window.innerWidth;
if((lastWindowSize <= 700 && currentWindowSize > 700) || (lastWindowSize > 700 && currentWindowSize <= 700)) {
loadImgs();
}
lastWindowSize = currentWindowSize;
};
.top-header-settings {
font-family: inherit;
font-size: 18px;
font-weight: 400;
text-transform: uppercase;
letter-spacing: .1em;
margin: 0 0 45px;
padding: 45px 0 0;
color: #524949;
border-top: 1px solid #ddd;
}
.top-menu-wrap {
margin: 0 auto;
position: relative;
;
background-color: #343434;
}
.top-menu-inner {
max-width: 1200px;
height: 260px;
/*/background-color:#343434;/*/
margin: 0 auto;
}
.top-menu-innerr {
max-width: 1161px;
height: 200px;
margin: 0 auto;
padding-top: 20px;
}
.top-menu-button {
width: 220px;
height: 220px;
display: inline-block;
margin: 5px;
text-align: center;
font-size: 16px;
opacity: .6;
transition: 0.3s;
}
.top-menu-button:hover {
opacity: 1
}
@font-face {
font-family: 'roboto';
src: url(https://fonts.googleapis.com/css?family=Roboto);
}
.top-menu-text {
width: 125px;
height: 30px;
/*/background-color:red;/*/
margin: 150px auto;
text-align: center;
color: white;
font-family: 'roboto';
font-size: 20px;
background: #343434;
-khtml-opacity: .50;
-moz-opacity: .50;
-ms-filter: ”alpha(opacity=50)”;
filter: alpha(opacity=50);
filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0.5);
opacity: .60;
border-style: solid;
border-width: 1px;
line-height: 25px;
}
.coming-soon-top {
width: 75px;
height: 20px;
font-size: 10px;
text-align: center;
color: white;
position: absolute;
font-family: 'roboto';
background: #c78f8f;
}
@media only screen and (max-width:1200px) {
.top-menu-wrap {
margin: 0 auto;
position: relative;
background-color: #343434;
}
.top-menu-inner {
max-width: 1200px;
min-height: 340px;
/*/ background-color:#343434;/*/
margin: 0 auto;
}
.top-menu-innerr {
max-width: 80%;
min-height: 200px;
width: 80vw;
margin: 0 auto;
/*/background:red;/*/
}
.top-menu-button {
width: 80vw;
height: 80vw;
max-width: 1080px;
max-height: 1080px;
background-repeat: no-repeat;
background-size: contain;
background-position: center;
float: left;
margin: 1px auto;
text-align: center;
font-size: 16px;
margin: 4px 2px;
opacity: 1;
transition: 0.3s;
color: white;
}
.top-menu-button:hover {
opacity: .6
}
#product2 {
/*background: url("http://via.placeholder.com/1080x1080");*/
/*/background:#c77f7f;/*/
width: 80vw;
height: 80vw;
max-width: 1080px;
max-height: 1080px;
background-repeat: no-repeat;
background-size: contain;
background-position: center;
}
#product1 {
/*background: url("http://via.placeholder.com/1080x1080");*/
/*/background:#c77f7f;/*/
width: 80vw;
height: 80vw;
max-width: 1080px;
max-height: 1080px;
background-repeat: no-repeat;
background-size: contain;
background-position: center;
}
#product3 {
/*background: url("http://via.placeholder.com/1080x1080");*/
/*/background:#c77f7f;/*/
width: 80vw;
height: 80vw;
max-width: 1080px;
max-height: 1080px;
background-repeat: no-repeat;
background-size: contain;
background-position: center;
}
#product4 {
/*background: url("http://via.placeholder.com/1080x1080");*/
/*/background:#c77f7f;/*/
width: 80vw;
height: 80vw;
max-width: 1080px;
max-height: 1080px;
background-repeat: no-repeat;
background-size: contain;
background-position: center;
}
#product5 {
/*background: url("http://via.placeholder.com/1080x1080");*/
/*/background:#c77f7f;/*/
width: 80vw;
height: 80vw;
max-width: 1080px;
max-height: 1080px;
background-repeat: no-repeat;
background-size: contain;
background-position: center;
}
.top-menu-text {
/*/width:125px;/*/
/*/height:30px;/*/
width: 30vw;
height: 10vw;
/*/background-color:red;/*/
margin: 150px auto;
text-align: center;
color: white;
font-size: 5.9vw;
line-height: 9vw;
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/vanilla-lazyload/8.7.1/lazyload.min.js"></script>
<div class="top-menu-warp">
<div class="top-menu-inner">
<div class="top-menu-innerr">
<a href="#">
<div id="product1" class="top-menu-button lazy"
data-src-small="http://via.placeholder.com/220x220"
data-src-large="http://via.placeholder.com/1080x1080">
<div class="coming-soon-top">
Most Popular
</div>
<div class="top-menu-text">
Text
</div>
</div>
</a>
<a href="#">
<div id="product2" class="top-menu-button lazy"
data-src-small="http://via.placeholder.com/220x220"
data-src-large="http://via.placeholder.com/1080x1080">
<div class="top-menu-text">
Text
</div>
</div>
</a>
<a href="#">
<div id="product3" class="top-menu-button lazy"
data-src-small="http://via.placeholder.com/220x220"
data-src-large="http://via.placeholder.com/1080x1080">
<div class="top-menu-text">
Text
</div>
</div>
</a>
<a href="#">
<div id="product4" class="top-menu-button lazy"
data-src-small="http://via.placeholder.com/220x220"
data-src-large="http://via.placeholder.com/1080x1080">
<div class="top-menu-text">
Text
</div>
</div>
</a>
<a href="#">
<div id="product5" class="top-menu-button lazy"
data-src-small="http://via.placeholder.com/220x220"
data-src-large="http://via.placeholder.com/1080x1080">
<div class="coming-soon-top">
Coming soon
</div>
<div class="top-menu-text">
Text
</div>
</div>
</a>
</div>
</div>
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