How to achieve waterfall flow effect in JS

I will take the time to write another article today, about the effect of waterfall flow. Anyone who has worked on iOS knows that waterfall flow is also a very popular layout method in iOS, so I won’t introduce it here. Let’s take a look at how to use JS to achieve the waterfall flow effect.

I just entered the code directly, and the comments inside are very clear. If you don’t understand, you can ask me.

html：

CSS：

a, address, b, big, blockquote, body, center, cite, code, dd, del, p, dl, dt, em, fieldset, font, form, h1, h2, h3, h4, h5, h6, html, i, iframe, img, ins, label, legend, li, ol, p, pre, small, span, strong, u, ul, var{
    padding: 0;
    margin: 0;
}

#main {
    position: relative;
}

#main .box {
    padding: 15px 0 0 15px;
    float: left;
}

#main .box .pit {
    padding: 5px;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 0 0 2px gray;
    width: 165px;
}

#main .box .pit img {
    width: 165px;
}

JS：

/**
 * Created by huminghao on 2017/7/5.
 */
function $(id) {
    return typeof id === 'string' ? document.getElementById(id) : id;
}

// 当页面加载完毕
window.onload = function () {
    // 实现瀑布流
    waterFlow('main', 'box');

    // 监听页面的滚动
    window.onscroll = function () {
        // 判断是否具备加载图片的条件
        if (checkWillLoadImg()) {
            // 造数据
            var dataImg = {'data' : [{'src' : '0.jpg'}, {'src' : '1.jpg'},{'src' : '2.jpg'},{'src' : '3.jpg'},{'src' : '4.jpg'},{'src' : '5.jpg'},{'src' : '6.jpg'},{'src' : '7.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'},{'src' : '0.jpg'}]}

            for (var i = 0; i < dataImg.data; i ++) {
                // 创建最外层的盒子
                var newBox = document.createElement('p');
                newBox.className = 'box';
                $('main').appendChild(newBox);

                // 创建里面的盒子
                var newPic = document.createElement('p');
                newPic.className = 'pic';
                newBox.appendChild(newPic);

                // 创建图片
                var newImg = document.createElement('img');
                newImg.src = 'images/' + dataImg.data[i].src;
                newPic.appendChild(newImg);
            }
        }
    }

}


// 实现瀑布流
function waterFlow(parent, box) {
    // 让所有盒子的父标签居中
    // 1.拿到所有的盒子
    var allBoxs = $(parent).getElementsByClassName(box);

    // 2.拿到其中一个盒子的宽度
    var boxWidth = allBoxs[0].offsetWidth;

    // 3.求出页面的宽度
    var screenWidth = document.body.clientWidth;

    // 4.求出列数
    var clos = Math.floor(screenWidth / boxWidth);

    // 5.让父标签居中
    $(parent).style.cssText = 'width: ' + clos * boxWidth + 'px; margin: 0 auto';


    // 定位
    // 定义一个高度数组
    var heightArray = [];

    // 遍历
    for (var i = 0; i < allBoxs.length; i ++) {
        // 求出所有盒子的高度
        var boxHeight = allBoxs[i].offsetHeight;

        if (i

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