Flexslider延迟加载-仅在真正需要时加载图像 [英] Flexslider lazyloading - only load an image when it's truly needed

问题描述

这实际上仅是对Flexslider延迟加载此处的回答使用下面粘贴的代码.我想更改它，以便仅在真正需要时才加载图像.

This is really only following on from an answer to Flexslider lazyloading here I am using that code which I Have pasted below. I would like to alter it so that images only loaded when truly needed.

我在之前和之后尝试了其他Flexslider属性，但是它们在第一张幻灯片上产生了延迟吗?请为我提供一些帮助.

I tried the other Flexslider properties, before: and after: but they created a delay on the first slide? Please can I get some help with this.

$('#slider').flexslider({
start: function (slider) {
   // lazy load
   $(slider).find("img.lazy").each(function () {
      var src = $(this).attr("data-src");
      $(this).attr("src", src).removeAttr("data-src");
   });
 }
});

推荐答案

最后我得到了一些帮助，这里的代码更少:)

I got some help in the end, here we have less code :)

jQuery:

$(window).load(function() {
 $('#sld-auto-930').flexslider({
  // put your settings properties here
  after: function (slider) {       
  //instead of going over every single slide, we will just load the next immediate slide
  var slides = slider.slides,
      index = slider.animatingTo,
      $slide = $(slides[index]),
      $img = $slide.find('img[data-src]');
      if($img){
      $img.attr("src", $img.attr('data-src')).removeAttr("data-src");
     }
}
});

HTML:

if($i > 0) {
    echo '<img class="lazy'.$i.'"src="" data-src="'.$src.'" alt="'.$alt.'">';
 }else {
    echo '<img class="first'.$i.'"src="'.$src.'"  alt="'.$alt.'">';                         }       
$i++;

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