关于把jquery瀑布流应用和数据库对接的问题-问答-阿里云开发者社区-阿里云

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关于把jquery瀑布流应用和数据库对接的问题

吴孟桥 2016-05-31 01:20:53 2079
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">

  <title>jQuery Wookmark Plug-in Example</title>
  <meta name="description" content="An very basic example of how to use the Wookmark jQuery plug-in.">
  <meta name="author" content="Christoph Ono, Sebastian Helzle">

  <meta name="viewport" content="width=device-width,initial-scale=1">

  <!-- CSS Reset -->
  <link rel="stylesheet" href="../css/reset.css">

  <!-- Global CSS for the page and tiles -->
  <link rel="stylesheet" href="../css/main.css">

</head>

<body>

  <div id="container">
    <header>
      <h1>jQuery Wookmark Plug-in Example</h1>
      <p>Scroll down to see the infinite scroll effect.</p>
    </header>
    <div id="main" role="main">

      <ul id="tiles">
        <!-- These are our grid blocks -->
        <li><img src="../sample-images/image_1.jpg" width="200" height="283"><p>1</p></li>
        <li><img src="../sample-images/image_2.jpg" width="200" height="300"><p>2</p></li>
        <li><img src="../sample-images/image_3.jpg" width="200" height="252"><p>3</p></li>
        <li><img src="../sample-images/image_4.jpg" width="200" height="158"><p>4</p></li>
        <li><img src="../sample-images/image_5.jpg" width="200" height="300"><p>5</p></li>
        <li><img src="../sample-images/image_6.jpg" width="200" height="297"><p>6</p></li>
        <li><img src="../sample-images/image_7.jpg" width="200" height="200"><p>7</p></li>
        <li><img src="../sample-images/image_8.jpg" width="200" height="200"><p>8</p></li>
        <li><img src="../sample-images/image_9.jpg" width="200" height="398"><p>9</p></li>
        <li><img src="../sample-images/image_10.jpg" width="200" height="267"><p>10</p></li>
        <li><img src="../sample-images/image_1.jpg" width="200" height="283"><p>11</p></li>
        <li><img src="../sample-images/image_2.jpg" width="200" height="300"><p>12</p></li>
        <li><img src="../sample-images/image_3.jpg" width="200" height="252"><p>13</p></li>
        <li><img src="../sample-images/image_4.jpg" width="200" height="158"><p>14</p></li>
        <li><img src="../sample-images/image_5.jpg" width="200" height="300"><p>15</p></li>
        <li><img src="../sample-images/image_6.jpg" width="200" height="297"><p>16</p></li>
        <li><img src="../sample-images/image_7.jpg" width="200" height="200"><p>17</p></li>
        <li><img src="../sample-images/image_8.jpg" width="200" height="200"><p>18</p></li>
        <li><img src="../sample-images/image_9.jpg" width="200" height="398"><p>19</p></li>
        <li><img src="../sample-images/image_10.jpg" width="200" height="267"><p>20</p></li>
        <li><img src="../sample-images/image_1.jpg" width="200" height="283"><p>21</p></li>
        <li><img src="../sample-images/image_2.jpg" width="200" height="300"><p>22</p></li>
        <li><img src="../sample-images/image_3.jpg" width="200" height="252"><p>23</p></li>
        <li><img src="../sample-images/image_4.jpg" width="200" height="158"><p>24</p></li>
        <li><img src="../sample-images/image_5.jpg" width="200" height="300"><p>25</p></li>
        <li><img src="../sample-images/image_6.jpg" width="200" height="297"><p>26</p></li>
        <li><img src="../sample-images/image_7.jpg" width="200" height="200"><p>27</p></li>
        <li><img src="../sample-images/image_8.jpg" width="200" height="200"><p>28</p></li>
        <li><img src="../sample-images/image_9.jpg" width="200" height="398"><p>29</p></li>
        <li><img src="../sample-images/image_10.jpg" width="200" height="267"><p>30</p></li>

        <!-- End of grid blocks -->
      </ul>

    </div>
    <footer>

    </footer>
  </div>

  <!-- include jQuery -->
  <script src="../libs/jquery.min.js"></script>

  <!-- Include the imagesLoaded plug-in -->
  <script src="../libs/jquery.imagesloaded.js"></script>

  <!-- Include the plug-in -->
  <script src="../jquery.wookmark.js"></script>

  <!-- Once the page is loaded, initalize the plug-in. -->
  <script type="text/javascript">
    (function ($){
      var $tiles = $('#tiles'),
          $handler = $('li', $tiles),
          $main = $('#main'),
          $window = $(window),
          $document = $(document),
          options = {
            autoResize: true, // This will auto-update the layout when the browser window is resized.
            container: $main, // Optional, used for some extra CSS styling
            offset: 20, // Optional, the distance between grid items 图片与图片之间的间距
            itemWidth: 210 // Optional, the width of a grid item 太小的话图片与图片会叠加
          };

      /**
       * Reinitializes the wookmark handler after all images have loaded
       */
      function applyLayout() {
        $tiles.imagesLoaded(function() {
          // Destroy the old handler
          if ($handler.wookmarkInstance) {
            $handler.wookmarkInstance.clear();
          }

          // Create a new layout handler.
          $handler = $('li', $tiles);
          $handler.wookmark(options);
        });
      }

      /**
       * When scrolled all the way to the bottom, add more tiles
       */
      function onScroll() {
        // Check if we're within 100 pixels of the bottom edge of the broser window.
        var winHeight = window.innerHeight ? window.innerHeight : $window.height(), // iphone fix
            closeToBottom = ($window.scrollTop() + winHeight > $document.height() - 100);

        if (closeToBottom) {
          // Get the first then items from the grid, clone them, and add them to the bottom of the grid
          var $items = $('li', $tiles),
              $firstTen = $items.slice(0, 10);
          $tiles.append($firstTen.clone());

          applyLayout();
        }
      };

      // Call the layout function for the first time
      applyLayout();

      // Capture scroll event.
      $window.bind('scroll.wookmark', onScroll);
    })(jQuery);
  </script>

</body>
</html>

1
我想要的瀑布流是从数据库里读取,但网页进来时不会显示全部图片,往下滑动时才会显示其他图片。而这种它一次就把所有图片读取,滑动到底部也只是重复一遍而已。

jquery瀑布流 数据库应用 应用的问题 jquery数据库
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  • 吴孟桥
    2019-07-17 19:21:06

    一般瀑布流插件有配置支持动态从数据库中读取数据的,你认真看下API。

    如果确认你的这个不支持动态读取,只能换一个瀑布流插件了,如这个:

      (function ($) {
        var 
        //参数
       setting = {
           column_width: 240, //列宽
           column_className: 'waterfall_column', //列的类名
           column_space: 10, //列间距
           cell_selector: '.cell', //要排列的砖块的选择器,context为整个外部容器
           img_selector: 'img', //要加载的图片的选择器
           auto_imgHeight: true, //是否需要自动计算图片的高度
           fadein: true, //是否渐显载入
           fadein_speed: 600, //渐显速率,单位毫秒
           insert_type: 1, //单元格插入方式,1为插入最短那列,2为按序轮流插入
           getResource: function (index) { }  //获取动态资源函数,必须返回一个砖块元素集合,传入参数为加载的次数
       },
        //
       waterfall = $.waterfall = {}, //对外信息对象
       $waterfall = null; //容器
        waterfall.load_index = 0, //加载次数
       $.fn.extend({
           waterfall: function (opt) {
               opt = opt || {};
               setting = $.extend(setting, opt);
               $waterfall = waterfall.$waterfall = $(this);
               waterfall.$columns = creatColumn();
               render($(this).find(setting.cell_selector).detach(), false); //重排已存在元素时强制不渐显
               waterfall._scrollTimer2 = null;
               $(window).bind('scroll', function () {
                   clearTimeout(waterfall._scrollTimer2);
                   waterfall._scrollTimer2 = setTimeout(onScroll, 300);
               });
               waterfall._scrollTimer3 = null;
               $(window).bind('resize', function () {
                   clearTimeout(waterfall._scrollTimer3);
                   waterfall._scrollTimer3 = setTimeout(onResize, 300);
               });
           }
       });
        function creatColumn() {//创建列
            waterfall.column_num = calculateColumns(); //列数
            //循环创建列
            var html = '';
            for (var i = 0; i < waterfall.column_num; i++) {
                html += '<div class="' + setting.column_className + '" style="width:' + setting.column_width + 'px; display:inline-block; *display:inline;zoom:1; margin-left:' + setting.column_space / 2 + 'px;margin-right:' + setting.column_space / 2 + 'px; vertical-align:top; overflow:hidden"></div>';
            }
            $waterfall.prepend(html); //插入列
            return $('.' + setting.column_className, $waterfall); //列集合
        }
        function calculateColumns() {//计算需要的列数
            var num = Math.floor(($waterfall.innerWidth()) / (setting.column_width + setting.column_space));
            if (num < 1) { num = 1; } //保证至少有一列
            return num;
        }
        function render(elements, fadein) {//渲染元素
            if (!$(elements).length) return; //没有元素
            var $columns = waterfall.$columns;
            $(elements).each(function (i) {
                if (!setting.auto_imgHeight || setting.insert_type == 2) {//如果给出了图片高度,或者是按顺序插入,则不必等图片加载完就能计算列的高度了
                    if (setting.insert_type == 1) {
                        insert($(elements).eq(i), setting.fadein && fadein); //插入元素
                    } else if (setting.insert_type == 2) {
                        insert2($(elements).eq(i), i, setting.fadein && fadein); //插入元素  
                    }
                    return true; //continue
                }
                if ($(this)[0].nodeName.toLowerCase() == 'img' || $(this).find(setting.img_selector).length > 0) {//本身是图片或含有图片
                    var image = new Image;
                    var src = $(this)[0].nodeName.toLowerCase() == 'img' ? $(this).attr('src') : $(this).find(setting.img_selector).attr('src');
                    image.onload = function () {//图片加载后才能自动计算出尺寸
                        image.onreadystatechange = null;
                        if (setting.insert_type == 1) {
                            insert($(elements).eq(i), setting.fadein && fadein); //插入元素
                        } else if (setting.insert_type == 2) {
                            insert2($(elements).eq(i), i, setting.fadein && fadein); //插入元素  
                        }
                        image = null;
                    }
                    image.onreadystatechange = function () {//处理IE等浏览器的缓存问题:图片缓存后不会再触发onload事件
                        if (image.readyState == "complete") {
                            image.onload = null;
                            if (setting.insert_type == 1) {
                                insert($(elements).eq(i), setting.fadein && fadein); //插入元素
                            } else if (setting.insert_type == 2) {
                                insert2($(elements).eq(i), i, setting.fadein && fadein); //插入元素  
                            }
                            image = null;
                        }
                    }
                    image.src = src;
                } else {//不用考虑图片加载
                    if (setting.insert_type == 1) {
                        insert($(elements).eq(i), setting.fadein && fadein); //插入元素
                    } else if (setting.insert_type == 2) {
                        insert2($(elements).eq(i), i, setting.fadein && fadein); //插入元素  
                    }
                }
            });
        }
        function public_render(elems) {//ajax得到元素的渲染接口
            render(elems, true);
        }
        function insert($element, fadein) {//把元素插入最短列
            if (fadein) {//渐显
                $element.css('opacity', 0).appendTo(waterfall.$columns.eq(calculateLowest())).fadeTo(setting.fadein_speed, 1);
            } else {//不渐显
                $element.appendTo(waterfall.$columns.eq(calculateLowest()));
            }
        }
        function insert2($element, i, fadein) {//按序轮流插入元素
            if (fadein) {//渐显
                $element.css('opacity', 0).appendTo(waterfall.$columns.eq(i % waterfall.column_num)).fadeTo(setting.fadein_speed, 1);
            } else {//不渐显
                $element.appendTo(waterfall.$columns.eq(i % waterfall.column_num));
            }
        }
        function calculateLowest() {//计算最短的那列的索引
            var min = waterfall.$columns.eq(0).outerHeight(), min_key = 0;
            waterfall.$columns.each(function (i) {
                if ($(this).outerHeight() < min) {
                    min = $(this).outerHeight();
                    min_key = i;
                }
            });
            return min_key;
        }
        function getElements() {//获取资源
            $.waterfall.load_index++;
            return setting.getResource($.waterfall.load_index, public_render);
        }
        waterfall._scrollTimer = null; //延迟滚动加载计时器
        function onScroll() {//滚动加载
            clearTimeout(waterfall._scrollTimer);
            waterfall._scrollTimer = setTimeout(function () {
                var $lowest_column = waterfall.$columns.eq(calculateLowest()); //最短列
                var bottom = $lowest_column.offset().top + $lowest_column.outerHeight(); //最短列底部距离浏览器窗口顶部的距离
                var scrollTop = document.documentElement.scrollTop || document.body.scrollTop || 0; //滚动条距离
                var windowHeight = document.documentElement.clientHeight || document.body.clientHeight || 0; //窗口高度
                if (scrollTop >= bottom - windowHeight) {
                    render(getElements(), true);
                }
            }, 100);
        }
        function onResize() {//窗口缩放时重新排列
            if (calculateColumns() == waterfall.column_num) return; //列数未改变,不需要重排
            var $cells = waterfall.$waterfall.find(setting.cell_selector);
            waterfall.$columns.remove();
            waterfall.$columns = creatColumn();
            render($cells, false); //重排已有元素时强制不渐显
        }
    })(jQuery);

    配置getResource即可。。自己用ajax读出数据后调用render回调即可

        var totalpage = 1;//从数据库中读取总页数赋值给这个js变量,如<%=你的服务器端变量名%>
    
         function getResource(index, render) { if (index + 1 > totalpage || opt.loading) return false; opt.loading = true;  $.ajax({ url: '动态页地址', data: {  page: index + 1, pagesize: 8}, type: 'POST', complete: function (xhr) { opt.loading = false; $('#pLoading').hide(); render($(xhr.responseText)); } }); }
        var opt = { auto_imgHeight: true, insert_type: 1 };
        if (totalpage > 1) opt.getResource = getResource;
        $('#waterfall').waterfall(opt);
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