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Jun 24, 2016 am 11:25 AM

文件夹treeview的效果

这样的treeview在实际项目中使用的场景较多。

既然用的多，那就DIY一遍，虽没有面面俱到，但也要将其基本实现完成一遍。

1.先准备图标素材

file.gif，文件图标

folder.gif，文件夹打开中的图标

folder-closed.gif，文件夹关闭着的图标

treeview-default.gif，折叠图标

treeview-default-line.gif，折叠线图标，实际分辨率是16*1776

treeview是基于ul li以及他们的嵌套，将文件夹树用列表搭出

html代码

<!DOCTYPE><html>    <head>        <meta http-equiv="content-type" content="text/html; charset=utf-8"/>        <title>treeview</title>        <style type="text/css">        </style>    </head>    <body>            <h4 id="treeview">treeview</h4>    <ul id="browser" class="treeview">        <li>            <div class='foldarea foldarea-collapsable'></div>            <span class="folder folder-opened">文件夹1</span>            <ul>                <li class="last"><span class="file">文件1-1</span></li>            </ul>        </li>        <li>            <div class='foldarea foldarea-collapsable'></div>            <span class="folder folder-opened">文件夹2</span>            <ul>                <li>                    <div class='foldarea foldarea-collapsable'></div>                    <span class="folder folder-opened">文件夹2.1</span>                    <ul id="">                        <li><span class="file">文件2.1-1</span></li>                        <li class="last"><span class="file">文件2.1-2</span></li>                    </ul>                </li>                <li class="last"><span class="file">文件2-1</span></li>            </ul>        </li>        <li>            <div class='foldarea foldarea-collapsable'></div>            <span class="folder folder-opened">文件夹3</span>            <ul>                <li class="last"><span class="file">文件3-1</span></li>            </ul>        </li>        <li class="last"><span class="file">文件0-1</span></li>    </ul>    <script src="lib/jquery.js" type="text/javascript"></script>    <script type="text/javascript">        </script></body></html>

在代码中使用css的类名将各个元素的角色定义好，已备后续的css定义。

一个列表的样式出来后，为了将列表的样式改成文件夹树的样式，先得把列表ul样式清空，包括嵌套的ul，将他们的padding和margin都设成0px已备后续按照自己的要求定义。

            .treeview, .treeview ul{                list-style: none;                padding: 0px;                margin: 0px;            }

将列表的背景色设成白色，设置顶外边距保持与上面的元素一点距离。

为li设上自定义的内边距达到自定义缩进的目的。

            .treeview ul{                background-color: white;                margin-top: 4px;            }            .treeview li{                margin:0px;                padding:3px 0px 3px 16px;            }

列表模式是展开状态。

在文件夹span前，加上加号或减号图标，使用div作为图标显示元素，默认采用可折叠样式foldarea-collapsable，显示减号图标。

        <li>            <div class='foldarea foldarea-collapsable'></div>            <span class="folder folder-opened">文件夹1</span>            <ul>                <li class="last"><span class="file">文件1-1</span></li>            </ul>        </li>

将该div设成左浮动，这样就可以变成可设定宽度的内联元素，和文件夹span处于一行。

            .treeview .foldarea{                height: 16px;                width: 16px;                float: left;                margin-left: -16px;            }

定义可折叠样式和可展开样式。

可折叠样式表示，当前列表处于展开中，显示减号图标。

可展开样式表示，当前列表处于折叠中，显示加号图标。

            .treeview  .foldarea-expandable{                background: url(images/treeview-default.gif) -80px -3px no-repeat;            }            .treeview .foldarea-collapsable{                background: url(images/treeview-default.gif) -64px -25px no-repeat;            }

为文件夹文字前加上文件夹图标，默认采用文件夹已打开样式folder-opened，显示文件夹已打开图标。

        <li>            <div class='foldarea foldarea-collapsable'></div>            <span class="folder folder-opened">文件夹1</span>            <ul>                <li class="last"><span class="file">文件1-1</span></li>            </ul>        </li>

先设置文件夹文字缩进，让其向右缩进自定义的距离，为图标显示留下空间。

            .treeview .folder{                padding: 1px 0px 1px 16px;            }

定义文件夹已打开和已关闭样式，用来设置对应的图标。

            .treeview .folder-opened{                background: url(images/folder.gif) 0 0 no-repeat;            }            .treeview .folder-closed{                background: url(images/folder-closed.gif) 0 0 no-repeat;            }

定义文件样式，为文件文字前加上文件图标。

        <li>            <div class='foldarea foldarea-collapsable'></div>            <span class="folder folder-opened">文件夹1</span>            <ul>                <li class="last"><span class="file">文件1-1</span></li>            </ul>        </li>

将文件文字缩进，为图标露出显示空间，设置文件背景图标。

            .treeview .file{                background: url(images/file.gif) 0 0 no-repeat;                padding: 0px 0px 1px 16px;            }

为所有的li列表项设置折叠线背景

折叠线背景图的上部有个直角的小分叉。

            .treeview li {                background: url(images/treeview-default-line.gif) 0 0 no-repeat;            }

设置完折叠线后，每一个最后的列表项都会拖一个尾巴，为了去掉这个尾巴，折叠线背景图的最下部是一个直角的闭合样式。

并且将所有最后一个li列表项设置成last样式，表示这是最后一个列表项

        <li>            <div class='foldarea foldarea-collapsable'></div>            <span class="folder folder-opened">文件夹1</span>            <ul>                <li class="last"><span class="file">文件1-1</span></li>            </ul>        </li>                    
            文件夹2                                                
                    文件夹2.1                                            文件2.1-1
                        文件2.1-2
                    
                
                文件2-1
            
        
                    
            文件夹3                            文件3-1
            
        
        文件0-1

last样式的关键点就是把折叠线的可视部分通过background-position定位到下部的直角上，这样在效果上就把折叠线给关闭了。

            .treeview li.last {                background-position: 0 -1766px;            }

最后，我们要在鼠标移到文件夹上后改变文字色以及鼠标指针。

那么先定义hover样式。

            .hover{                cursor: pointer;                color: red;            }

找到所有的文件夹span，响应hover事件，动态的添加和删除鼠标进入样式，已达到动态效果。

并且响应文件夹span和加减号div的单击事件，在展开的时候单击就折叠其下的列表，在折叠的时候单击就展开，折叠和展开是通过控制display:none样式来实现。

然后就是根据折叠或展开的状态控制图标的显示。

       $(document).ready(function(){            var folders = $('.folder');            var foldareas = $('.foldarea');            //鼠标移入文件夹节点上，节点文字变色，鼠标指针改变            folders.hover(                    function(){                        $(this).addClass('hover');                    },                    function(){                        $(this).removeClass('hover');                    }            );            var doFold = function(){                var ul = $('ul',this.parentNode)[0];                var foldarea = $('.foldarea',this.parentNode)[0];                var folder = $('.folder',this.parentNode)[0];                if(!ul){                    return;                }                var ulDisplay =   $(ul).css('display');                if(ulDisplay==='none'){                    //展开列表                    $(ul).css('display','block');                    //显示展开时的文件夹图标                    $(folder).removeClass('folder-closed');                    $(folder).addClass('folder-opened');                    //展开时显示可折叠图标                    $(foldarea).removeClass('foldarea-expandable');                    $(foldarea).addClass('foldarea-collapsable');                }else{                    //通过隐藏来实现折叠列表                    $(ul).css('display','none');                    //显示折叠时的文件夹图标                    $(folder).removeClass('folder-opened');                    $(folder).addClass('folder-closed');                    //折叠时显示可展开图标                    $(foldarea).removeClass('foldarea-collapsable');                    $(foldarea).addClass('foldarea-expandable');                }            };            //将文件夹节点下的列表折叠或展开            folders.click(doFold);            foldareas.click(doFold);        });

至此，完成了treeview的基本实现。

如果需要完成整体功能，就要在此基础之上封装实现treeview的各个功能。

代码：戳

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