用C#从数据库动态生成AdminLTE菜单的一种方法

当前的应用设计风格趋于Flat扁平化,很多基于BootStrap实现了很多UI非常漂亮的管理界面(Bootstrap admin template)。首先看一下主界面:

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查看左边导航的菜单html结构:

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通过观察,可以发现其中菜单树的特点,这里注意一下,菜单顶级的标题显示在span中,另外class也不同。那边如何从数据库动态生成符合此特征的treemenu结构呢?

1 数据库字段设计

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2 演示数据

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5 菜单类实现:

首先树结构的菜单,自然想到用递归来构建,代码如下:

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public  class AdminLTEHelper
    {
        /// <summary>
        /// 根据DataTable生成AdminLTE的多级菜单目录
        /// GetTreeJsonByTable(datatable, "id", "title", "pid", "0","menulevel");
        /// </summary>
        /// <param name="tabel">数据源
        /// <param name="idcol">ID列
        /// <param name="txtcol">Text列
        /// <param name="rela">关系字段(字典表中的树结构字段)
        /// <param name="pid">父ID值(0)
        /// <param name="colmenulevel">菜单显示层级列名
        public StringBuilder result = new StringBuilder();
        public StringBuilder sb = new StringBuilder();
     
        public void GetTreeJsonByTable(DataTable tabel, string idCol, string txtCol, string rela, object pId,string colmenulevel)
        {
 
            result.Append(sb.ToString());
            sb.Clear();
 
            if (tabel.Rows.Count > 0)
            {
                
                string filer = string.Format("{0}='{1}'", rela, pId);
                DataRow[] rows = tabel.Select(filer);
                if (rows.Length > 0)
                {
                    foreach (DataRow row in rows)
                    {
                        if (tabel.Select(string.Format("{0}='{1}'", rela, row[idCol])).Length > 0)
                        {
                            //第一层级,名称在<span>多级菜单</span>中 class为treeview
                            //colmenulevel为menulevel,为菜单的显示层级,可以在后台进行配置
                            //和树的层级可能不同
                            if (row[colmenulevel].ToString() == "1")
                            {
                                sb.Append("<li class=\"treeview\"><a href=\"#\"><i class=\"fa fa-folder\"><span>" + row[txtCol] + "</span><span class=\"pull-right-container\"> <i class=\"fa fa-angle-left pull-right\">");
 
                            }
                            else
                            {
                                
                               sb.Append("<li><a href=\"#\"><i class=\"fa fa-folder\">" + row[txtCol] + "<span class=\"pull-right-container\"> <i class=\"fa fa-angle-left pull-right\">");
                              
                            }
                            sb.Append("<ul class=\"treeview-menu\">");
                            GetTreeJsonByTable(tabel, idCol, txtCol, rela, row[idCol], colmenulevel);
                            sb.Append("");
                            sb.Append("</ul class=\"treeview-menu\"></i class=\"fa fa-angle-left pull-right\"></span class=\"pull-right-container\"></i class=\"fa fa-folder\"></a href=\"#\"></li>");
                            result.Append(sb.ToString());
                            sb.Clear();
                            
                        }
                        else
                        {
                            //isleaf=true
                            if (row[colmenulevel].ToString() == "1")
                            {
                                //顶级菜单,标题显示在span中,否则显示图标时,标题不能隐藏
                                sb.Append("<li class=\"treeview\"><a href=\"#\" moid=\"" + row[idcol] + "\",text=\"" + row[txtcol] + "\",isleaf=\"true\"" ",url=\"" + row["url"] + "\"><i class=\"fa fa-folder\"><span>" + row[txtCol] + "</span>");
 
                            }
                            else
                            {
                                sb.Append("<li><a href=\"#\" moid=\"" + row[idcol] + "\",text=\"" + row[txtcol] + "\",isleaf=\"true\"" ",url=\"" + row["url"] + "\"><i class=\"fa fa-folder\">" + row[txtCol] + "</i class=\"fa fa-folder\"></a href=\"#\" moid=\"" + row[idcol] + "\",text=\"" + row[txtcol] + "\",isleaf=\"true\"" ",url=\"" + row["url"] + "\"></li>");
                            }
 
                            //sb.Append("<li><a href=\"#\" moid=\"" + row[idcol] + "\",text=\"" + row[txtcol] + "\",isleaf=\"true\"" + ",url=\"" + row["url"] + "\"><i class=\"fa fa-folder\">" + row[txtCol] + "</i class=\"fa fa-folder\"></a href=\"#\" moid=\"" + row[idcol] + "\",text=\"" + row[txtcol] + "\",isleaf=\"true\"" + ",url=\"" + row["url"] + "\"></li>");
 
                            result.Append(sb.ToString());
                            sb.Clear();
                        }
                        result.Append(sb.ToString());
                        sb.Clear();
                       
                    }
                     
                }
               
                result.Append(sb.ToString());
                sb.Clear();
 
            }
 
        }
    }</i class=\"fa fa-folder\"></a href=\"#\" moid=\"" + row[idcol] + "\",text=\"" + row[txtcol] + "\",isleaf=\"true\"" ",url=\"" + row["url"] + "\"></li class=\"treeview\"></i class=\"fa fa-angle-left pull-right\"></span class=\"pull-right-container\"></i class=\"fa fa-folder\"></a href=\"#\"></li class=\"treeview\"></param name="colmenulevel"></param name="pid"></param name="rela"></param name="txtcol"></param name="idcol"></param name="tabel">

6 调用

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7 测试

验证生成的菜单结构是否正确,首先看看显示的层级结构和数据库是否一致,另外查看单击上级,是否可以展开,最后注意的是,在左边菜单收缩后,只显示图标,鼠标移动到图标上后,并能正确显示子菜单:

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posted on 2016-12-14 18:24  張暁磊  阅读(838)  评论(0编辑  收藏  举报