Waterfall flow layout video material sharing

Waterfall flow, also known as waterfall flow layout. It is a popular website page layout. It is visually represented by a jagged multi-column layout. As the page scroll bar scrolls down, this layout will continuously load data blocks and append them to the current tail. The first website to adopt this layout was Pinterest, which gradually became popular in China. Most domestic fresh websites are basically of this style.

Waterfall flow layout is a popular layout method for websites. This case will give an in-depth explanation of the three major ways to implement waterfall flow layout: JavaScript, jQurey and CSS3. You will learn how to use JavaScript methods to position and sort images, two different ways to continuously load images, and multiple methods in CSS3. How to implement waterfall flow layout in column layout.

Video playback address: http://www.php.cn/course/301.html

Difficulties in learning:

$( window ).on( "load", function(){
 waterfall('main','box');
 //模拟数据json
 var dataJson = {'data': [{'src':'30.jpg'},{'src':'31.jpg'},{'src':'32.jpg'},{'src':'33.jpg'},{'src':'34.jpg'},{'src':'35.jpg'},{'src':'36.jpg'},{'src':'37.jpg'},{'src':'38.jpg'},{'src':'39.jpg'},{'src':'40.jpg'},{'src':'41.jpg'},{'src':'42.jpg'},{'src':'43.jpg'},{'src':'44.jpg'},{'src':'45.jpg'}]};
 window.onscroll=function(){
 var isPosting = false;
 if(checkscrollside('main','box') && !isPosting){
  isPosting = true;
  $.each(dataJson.data,function(index,dom){
  var $box = $(&#39;<div class="box"></div>&#39;);
  $box.html(&#39;<div class="pic"><img  src="/static/imghw/default1.png"  data-src="./images/&#39;+$(dom).attr(&#39;src&#39;)+&#39;"  class="lazy"   alt="Waterfall flow layout video material sharing" ></div>&#39;);
  $(&#39;#main&#39;).append($box);
  waterfall(&#39;main&#39;,&#39;box&#39;);
  isPosting = false;
  });
 }
 }
});
/*
 parend 父级id
 clsName 元素class
 */
function waterfall(parent,clsName){
 var $parent = $(&#39;#&#39;+parent);//父元素
 var $boxs = $parent.find(&#39;.&#39;+clsName);//所有box元素
 var iPinW = $boxs.eq( 0 ).width()+15;// 一个块框box的宽
 var cols = Math.floor( $( window ).width() / iPinW );//列数
 $parent.width(iPinW * cols).css({&#39;margin&#39;: &#39;0 auto&#39;});
 var pinHArr=[];//用于存储 每列中的所有块框相加的高度。
 $boxs.each( function( index, dom){
 if( index < cols ){
  pinHArr[ index ] = $(dom).height(); //所有列的高度
 }else{
  var minH = Math.min.apply( null, pinHArr );//数组pinHArr中的最小值minH
  var minHIndex = $.inArray( minH, pinHArr );
  $(dom).css({
  &#39;position&#39;: &#39;absolute&#39;,
  &#39;top&#39;: minH + 15,
  &#39;left&#39;: $boxs.eq( minHIndex ).position().left
  });
  //添加元素后修改pinHArr
  pinHArr[ minHIndex ] += $(dom).height() + 15;//更新添加了块框后的列高
 }
 });
}
//检验是否满足加载数据条件，即触发添加块框函数waterfall()的高度：最后一个块框的距离网页顶部+自身高的一半(实现未滚到底就开始加载)
function checkscrollside(parent,clsName){
 //最后一个块框
 var $lastBox = $(&#39;#&#39;+parent).find(&#39;.&#39;+clsName).last(),
 lastBoxH = $lastBox.offset().top + $lastBox.height()/ 2,
 scrollTop = $(window).scrollTop(),
 documentH = $(document).height();
 return lastBoxH < scrollTop + documentH ? true : false;
}

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