开发asp.net自定义控件(asp.net学习笔记五)

/// <summary><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

        /// 方法GenerateGetPosScript用于生成一段Javascript代码，其作用是为菜单定位

        /// </summary>

        /// <returns></returns>

        private string GenerateGetPosScript()

        {

            string getPosScript;

            getPosScript = "<script language=/"JavaScript/">/n";

            getPosScript = getPosScript + "function getPos(el,sProp) {/n";

            getPosScript = getPosScript + "/tvar iPos = 0/n";

            getPosScript = getPosScript + "/tel = el.offsetParent;/n";

            getPosScript = getPosScript + "/twhile (el!=null) {/n";

            getPosScript = getPosScript + "/t/tiPos+=el[/"offset/" + sProp]/n";

            getPosScript = getPosScript + "/t/tel = el.offsetParent/n}/n/treturn iPos;}/n";

            getPosScript = getPosScript + "</script>/n";

            return(getPosScript);

 

        }

        /// <summary>

        /// 方法TraverseMenuTree用于解析XML文件并生成HTML代码

        /// </summary>

        /// <param name="node">欲开始解析的节点</param>

        /// <returns></returns>

        private string TraverseMenuTree(System.Xml.XmlNode node)

        {

            string s = "";

            string rightCode;

            string[] Rule = RuleString.Split(',');

            if(node!=null&&node.HasChildNodes)

            {

                s = s + "<table border=/"0/" cellpadding=/"0/" cellspacing="+cellspacing.ToString()+"  width=/"100%/" class=/"a/">";

                s = s + "<tr align="+mainMenuAlign+" valign=/"middle/" class=/"mainmenu/">";

                for(int current=0; current<node.ChildNodes.Count; current++)

                {

                    string MenuLabelString = node.ChildNodes.Item(current).Attributes["Label"].Value;

                    s = s + "<td height="+mainMenuHeight.ToString()+" ><a href=/"#;/" onMouseOver=/"expandMenu(null,'menu"+current+"',getPos(this,'Left'),getPos(this,'Top')+this.offsetHeight);/" class=/"a/">/n/t/t"+MenuLabelString+"</a></td>/n";

                    s = s + "<div id=/"menu"+current+"/" class=/"menu/" onMouseOut=/"hideMe();/">";

                    if(node.ChildNodes.Item(current).FirstChild!=null&&node.ChildNodes.Item(current).FirstChild.HasChildNodes)

                    {

                        for(int i=0;i<node.ChildNodes.Item(current).FirstChild.ChildNodes.Count;i++)

                        {

                            string ItemLabelString = node.ChildNodes.Item(current).FirstChild.ChildNodes.Item(i).Attributes["Label"].Value;

                            string ItemURLString="";

                            if(node.ChildNodes.Item(current).FirstChild.ChildNodes.Item(i).Attributes["URL"] != null)

                            {

                                ItemURLString = node.ChildNodes.Item(current).FirstChild.ChildNodes.Item(i).Attributes["URL"].Value;

                            }

                            if(node.ChildNodes.Item(current).FirstChild.ChildNodes.Item(i).Attributes["RightCode"] != null)

                            {

                                rightCode = node.ChildNodes.Item(current).FirstChild.ChildNodes.Item(i).Attributes["RightCode"].Value;

                            }

                            else

                            {

                                rightCode = "";

                            }

                            foreach(string rule in Rule)

                            {

                                if(rule==rightCode || ruleString=="admin")

                                {

                                    s = s + "/n/t/t<a href=/"#;/" onMouseOver=/"expandMenu('menu"+current+"');/"  onclick=/"window.location='"+ItemURLString+"'/">";

                                    s = s + "/n/t/t"+ItemLabelString+"</a><br>";

                                }

                            }

                        }

                        s = s + "</div>";

                    }

                }

                s = s + "</tr>";

            }

            s = s + "</tr></table>/n/n";

            s = s + "<p class=/"a/"></p>/n";

            return s;

        }

重写方法：

/// <summary>

        /// 重写OnInit方法，初始化条件

        /// </summary>

        /// <param name="e"></param>

        protected override void OnInit(System.EventArgs e)

        {

            base.OnInit(e);

            return;

        }

        /// <summary>

        /// 将此控件呈现给指定的输出参数。

        /// </summary>

        /// <param name="output"> 要写出到的 HTML 编写器 </param>

        protected override void Render(HtmlTextWriter output)

        {

            output.Write(GenerateScript());

            output.Write(GenerateHtml());

            output.Write(GenerateGetPosScript());

        }

 

XML格式如下：

<?xml version="1.0" encoding="UTF-8"?>

<MenuData ImagesBaseURL="Menuimages/">

  <MenuGroup>

    <MenuItem Label="文件">

      <MenuGroup ExpandOffsetY="1" ExpandOffsetX="-1">

        <MenuItem Label="新建" URL="i_New.htm" RightCode="vd_ba"/>

        <MenuItem Label="保存" RightCode="vd_ba"/>

      </MenuGroup>

    </MenuItem>

  </MenuGroup>

</MenuData>

 

如前所述，这个Menu支持权限设置，只要设置它的RuleString属性即可。