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Native JavaScript implements waterfall flow layout_javascript skills

WBOY
Release: 2016-05-16 15:23:17
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The example in this article explains the detailed code for implementing waterfall flow layout in native JavaScript and shares it with you for your reference. The specific content is as follows

Rendering:

Specific code:

window.onload=function(){

  waterfall('main','pin');

  var dataInt={'data':[{'src':'1.jpg'},{'src':'2.jpg'},{'src':'3.jpg'},{'src':'4.jpg'}]};
  
  window.onscroll=function(){
    if(checkscrollside()){
      var oParent = document.getElementById('main');// 父级对象
      for(var i=0;i<dataInt.data.length;i++){
        var oPin=document.createElement('div'); //添加 元素节点
        oPin.className='pin';          //添加 类名 name属性
        oParent.appendChild(oPin);       //添加 子节点
        var oBox=document.createElement('div');
        oBox.className='box';
        oPin.appendChild(oBox);
        var oImg=document.createElement('img');
        oImg.src='./images/'+dataInt.data[i].src;
        oBox.appendChild(oImg);
      }
      waterfall('main','pin');
    };
  }
}


/*
  parend 父级id
  pin 元素class
*/
function waterfall(parent,pin){
  var oParent=document.getElementById(parent);// 父级对象
  var aPin=getClassObj(oParent,pin);// 获取存储块框pin的数组aPin
  var iPinW=aPin[0].offsetWidth;// 一个块框pin的宽
  var num=Math.floor(document.documentElement.clientWidth/iPinW);//每行中能容纳的pin个数【窗口宽度除以一个块框宽度】
  oParent.style.cssText='width:'+iPinW*num+'px;margin:0 auto;';//设置父级居中样式:定宽+自动水平外边距

  var pinHArr=[];//用于存储 每列中的所有块框相加的高度。
  for(var i=0;i<aPin.length;i++){//遍历数组aPin的每个块框元素
    var pinH=aPin[i].offsetHeight;
    if(i<num){
      pinHArr[i]=pinH; //第一行中的num个块框pin 先添加进数组pinHArr
    }else{
      var minH=Math.min.apply(null,pinHArr);//数组pinHArr中的最小值minH
      var minHIndex=getminHIndex(pinHArr,minH);
      aPin[i].style.position='absolute';//设置绝对位移
      aPin[i].style.top=minH+'px';
      aPin[i].style.left=aPin[minHIndex].offsetLeft+'px';
      //数组 最小高元素的高 + 添加上的aPin[i]块框高
      pinHArr[minHIndex]+=aPin[i].offsetHeight;//更新添加了块框后的列高
    }
  }
}

/*
  通过父级和子元素的class类 获取该同类子元素的数组
*/
function getClassObj(parent,className){
  var obj=parent.getElementsByTagName('*');//获取 父级的所有子集
  var pinS=[];//创建一个数组 用于收集子元素
  for (var i=0;i<obj.length;i++) {//遍历子元素、判断类别、压入数组
    if (obj[i].className==className){
      pinS.push(obj[i]);
    }
  };
  return pinS;
}

/*
  获取 pin高度 最小值的索引index
*/
function getminHIndex(arr,minH){
  for(var i in arr){
    if(arr[i]==minH){
      return i;
    }
  }
}

/*
  判断加载图片的条件
*/
function checkscrollside(){
  var oParent=document.getElementById('main');
  var aPin=getClassObj(oParent,'pin');
  var lastPinH=aPin[aPin.length-1].offsetTop+Math.floor(aPin[aPin.length-1].offsetHeight/2);//创建【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)
  var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;//注意解决兼容性
  var documentH=document.documentElement.clientHeight;//页面高度
  return (lastPinH<scrollTop+documentH)&#63;true:false;//到达指定高度后 返回true,触发waterfall()函数
}
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The above is the entire content of this article. I hope it will be helpful to everyone in realizing waterfall flow layout.

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