我覺得還意味着筆者鉤住whileScrolling
事件是這樣的:
(function($){
$(window).load(function(){
$("#content_1").mCustomScrollbar({
scrollButtons:{
enable:true
},
callbacks:{
whileScrolling:function(){ WhileScrolling(); }
}
});
function WhileScrolling(){
$("img.lazy").lazyload();
}
});
})(jQuery);
在HTML容器是這樣的:
<div id="content_1" class="content">
<p>Lorem ipsum dolor sit amet. Aliquam erat volutpat. Maecenas non tortor nulla, non malesuada velit.</p>
<p>
<img class="lazy img-responsive" data-original="/img/bmw_m1_hood.jpg" width="765" height="574" alt="BMW M1 Hood"><br/>
<img class="lazy img-responsive" data-original="/img/bmw_m1_side.jpg" width="765" height="574" alt="BMW M1 Side"><br/>
<img class="lazy img-responsive" data-original="/img/viper_1.jpg" width="765" height="574" alt="Viper 1"><br/>
<img class="lazy img-responsive" data-original="/img/viper_corner.jpg" width="765" height="574" alt="Viper Corner"><br/>
<img class="lazy img-responsive" data-original="/img/bmw_m3_gt.jpg" width="765" height="574" alt="BMW M3 GT"><br/>
<img class="lazy img-responsive" data-original="/img/corvette_pitstop.jpg" width="765" height="574" alt="Corvette Pitstop"><br/>
</p>
<p>Aliquam erat volutpat. Maecenas non tortor nulla, non malesuada velit. Nullam felis tellus, tristique nec egestas in, luctus sed diam. Suspendisse potenti. </p>
<p>Consectetur adipiscing elit. Nulla consectetur libero consectetur quam consequat nec tincidunt massa feugiat. Donec egestas mi turpis. Fusce adipiscing dui eu metus gravida vel facilisis ligula iaculis. Cras a rhoncus massa. Donec sed purus eget nunc placerat consequat.</p>
<p>Cras venenatis condimentum nibh a mollis. Duis id sapien nibh. Vivamus porttitor, felis quis blandit tincidunt, erat magna scelerisque urna, a faucibus erat nisl eget nisl. Aliquam consequat turpis id velit egestas a posuere orci semper. Mauris suscipit erat quis urna adipiscing ultricies. In hac habitasse platea dictumst. Nulla scelerisque lorem quis dui sagittis egestas.</p>
<p>Etiam sed massa felis, aliquam pellentesque est.</p>
<p>the end.</p>
</div>
爲了減少滾動期間的lazyload()
號碼,我們可以使用例如mcs.top
屬性爲滾動內容的頂部位置(像素):
function WhileScrolling()
{
// Debug:
// console.log('top: ' + mcs.top);
// Run lazyload in 10 pixel steps (adjust to your needs)
if(0 == mcs.top % 10)
{
// Run lazyload on the "div#conent_1" box:
$("#content_1 img.lazy").lazyload();
// Debug:
//console.log('lazyload - mcs.top: ' + mcs.top);
}
}
,我們限制layzload選擇,所以我們沒有發現在整個DOM樹的所有圖像。
我注意到,在的Internet Explorer 11,在mcs.top
可以是浮動的數字,但它在鉻 alwyas整個整數。
所以我們可以樓它與Math.floor()
。
爲了進一步降低lazyload來電,我們可以附加比較mcs.top
到它的前值:
var mcsTopPrev = 0;
var mcsTop = 0;
function WhileScrolling()
{
// Fix the Chrome vs Internet Explorer difference
mcsTop = Math.floor(mcs.top);
// Current vs previous
if( mcsTop != mcsTopPrev)
{
// Run lazyload in 10px scrolling steps (adjust to your needs)
if(0 == mcsTop % 10)
{
$("#cphContent_lReferences img.lazy").lazyload();
}
}
mcsTopPrev = mcsTop;
}
它的作品,但它被稱爲很多次,它也修改已加載的圖像。 – 2014-03-22 17:58:17
也許我們可以調用'lazyload()'函數一次'n'調用'WhileScrolling()',使用計數器? – birgire 2014-03-22 18:10:12
可能有一個函數可以防止lazyload刷新已經加載的圖像。我現在正在Google上搜索。 – 2014-03-22 18:17:55