瀑布流（基于Django）

# 后端

from django.shortcuts import render, HttpResponse

from django.http import JsonResponse

from app01 import models

import json

from django.db.models import Q

def imgs(request):

    return render(request, 'img.html')

def get_imgs(request):

    nid = request.GET.get('nid')

    img_list = models.Img.objects.filter(Q(id__gt=nid)&Q(id__lt=(nid+7))).values('id', 'src', 'title') # 一次从数据库取7张图片

    img_list = list(img_list)

    ret = {

        'status': True,

        'data': img_list

    }

    return JsonResponse(ret)

# HTML

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <style>

        .w {

            width: 1000px;

            margin: 0 auto;

        }

        .item {

            width: 25%;

            float: left;

        }

        .item img {

            width: 100%;

        }

    </style>

</head>

<body>

<div>姑娘们</div>

<div class="w" id="container">

    <div class="item"></div>

    <div class="item"></div>

    <div class="item"></div>

    <div class="item"></div>

</div>

<script src="/static/jquery-1.12.4.js"></script>

<script>

    $(function () {

        var obj = new ScrollImg();

        obj.fetchImg();

        obj.scrollEvent();

    });

    function ScrollImg() {

        this.NID = 0;

        this.LASTPOSITION = 3;

        this.fetchImg = function () {

            var that = this;

            $.ajax({

                url: '/get_imgs.html',

                type: 'GET',

                data: {nid: that.NID},

                dataType: 'JSON',

                success: function (arg) {

                    var img_list = arg.data;

                    $.each(img_list, function (index, v) {

                        var eqv = (index + that.LASTPOSITION + 1) % 4;

                        //console.log(eqv);

                        var tag = document.createElement('img');

                        tag.src = '/' + v.src;

                        $('#container').children().eq(eqv).append(tag);

                        if (index + 1 == img_list.length) {

                            that.LASTPOSITION = eqv;

                            that.NID = v.id;

                        }

                    })

                }

            })

        };

        this.scrollEvent = function () {

            var that = this;

            $(window).scroll(function () {

                var scrollTop = $(window).scrollTop();

                var winHeight = $(window).height();

                var docHeight = $(document).height();

                if (scrollTop + winHeight == docHeight) {

                    that.fetchImg();

                }

            })

        }

    }

</script>

</body>

</html>

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瀑布流（基于Django）

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