• 实现CheckBox的三种选中状态(全选、半选、不选)在GridView中模拟树形的功能


    度娘了很多帖子,只说三种状态要用图片替换来做,但没找到有用的例子,被逼自己写了一个

    三方控件肯定是很多的,如jstree,可以直接用

    由于公司的UDS限制,不能上传图片,只能文字说明了。

    就是要在gridview中实现如下效果:一级、二级因为三级没有全部选中而显示半选状态

    ▣一级
       ▣二级
          三级1
           三级2

     

     

     

     

    js↓

    $(function(){
            BindCheckNode();
            $("span[name^='lblCheck']").click(checkBoxClick);
         });
    
    function checkBoxClick()
         {
            var isChecked = $(this).attr("class") == "default" ? "checked"  : "default";
            $(this).attr("class",isChecked);
            //同步checkbox
            $(this).next().children().eq(0).attr("checked",isChecked!="default");  
            var trNode = $(this).parent().parent();
            
            childChange(trNode,isChecked);
            parentChange(trNode,isChecked); 
         }
    
    //数据绑定时,对选中状态的节点做变更,如果有一个子节点没有选中,则为半选中状态
           function BindCheckNode()
           {
               //判断选中状态的节点的子节点是否全部选中,
               $("span[name^='lblCheck']").each(function(){
                    if($(this).attr("class")=="checked")
                    {
                        var curNode = this.parentNode.parentNode;
                        if(!CheckAll(curNode))
                        {
                            $(this).attr("class","checkHalf");
                        } 
                    }
                });
           }    
              
           //选中状态判断
           function CheckAll(curNode) 
           {
             var level = parseInt($(curNode).attr("level"));
             var id = $(curNode).attr("id");
             var nextNode = $(curNode).next();
             while (nextNode != null && parseInt($(nextNode).attr("level")) > level) {
                //每个节点都要循环它的所有子节点,判断是否选择
                 var nextCheck=$(nextNode).children().eq(0).children("span").eq(1); 
                 if ($(nextCheck).attr("class") == "default") {
                     return false;   
                 }
                 nextNode = $(nextNode).next();
             }
             return true; 
         }
         
         //checkbox点击后影响子节点
         function childChange(curNode,className)
         {
            var level = parseInt($(curNode).attr("level"));
            var nextNode = $(curNode).next();
            
            //循环子节点
            while(nextNode!=null && parseInt($(nextNode).attr("level") ) > level)
            {
                var nextCheck=$(nextNode).children().eq(0).children("span:eq(1)"); 
                $(nextCheck).attr("class",className);
                $(nextCheck).next().children().eq(0).attr("checked",className!="default");   
                nextNode=$(nextNode).next();  
            } 
         }
         
         //checkbox点击后影响父节点
         function parentChange(curNode, className)
         {
            var pid = $(curNode).attr("pid");
            var parentNode = $("#"+pid);
            if(!$(parentNode).attr("pid"))
                return false;
            
            var parentSpanCheck=$(parentNode).children().eq(0).children("span").eq(1);
            var childList = $("tr[pid='"+pid+"']");
            var flag = false;
            var tempNode;
            $.each(childList, function(i,item){
                tempNode = $(item).children().eq(0).children("span").eq(1);
                if($(tempNode).attr("class") != className)
               {
                    flag = true; 
                    return;
               }
            });
            if(flag)
            {
                $(parentSpanCheck).attr("class", "checkHalf");
            } 
            else if(!flag && className == "checked")
            {
                 $(parentSpanCheck).attr("class", "checked");
            }
            else
            {
                 $(parentSpanCheck).attr("class", "default");
            }
            var parentSpanCheckClass=$(parentSpanCheck).attr("class");
            $(parentSpanCheck).next().children().eq(0).attr("checked",parentSpanCheckClass!="default");   
            if(pid != "0")
                changeParentState(parentNode, className);
         }
    View Code

    css↓  主要是背景图的移动,图片排列方式为 [全选][未选][半选]

     <style type="text/css">
            .checked {background-position-x: 0px;}
            .checkHalf{background-position-x: 23px;}
            .default{background-position-x: 46px;}
        </style>
    View Code

    C#前台 ↓  已将多余的东西删掉,gridview中只有一列,跟上面的table相似,lbl_Space用来增加缩进的,保留原始的checkbox,因为在保存的时候需要遍历整个gridview,不管是后台还是js中修改span的class属性,遍历gridview的时候是获取不到的

    <asp:GridView ID="dgResource" OnRowDataBound="dgResource_RowDataBound" DataKeyNames="ResourceID" runat="server" AutoGenerateColumns="False">
                            <Columns>
    
                                <asp:TemplateField>
                                    <HeaderStyle Wrap="False"></HeaderStyle>
                                    <ItemStyle Wrap="False"></ItemStyle>
                                    <ItemTemplate>
                                        <asp:Label runat="server" ID="lbl_Space" ForeColor="#f5fbff" Text='<%# GetSpaceNameFromLevel(DataBinder.Eval(Container, "DataItem.NameValues[Level]").ToString()) %>'>
                                        </asp:Label>
                                        <span id="lblCheck" name="lblCheck" runat="server" class="default" style=" 23px;
                                            height: 25px; background-image: url(../../Common/Images/Icons/checkboxButton.jpg);">
                                        </span>
                                       <div style="display:none;">
                                        <asp:CheckBox runat="server" ID="chk_Query"></asp:CheckBox>
                                       </div>  
                                        <asp:Label runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.ResourceName") %>'></asp:Label>
                                        <asp:HiddenField ID="hfdPID" runat="server" Value='<%# Eval("ParentResourceID") %>' />
                    <asp:HiddenField ID="hfdLevel" runat="server" Value='<%# Eval("NameValues[Level]") %>' />
                                    </ItemTemplate>
                                </asp:TemplateField>
                            </Columns>
                        </asp:GridView>
    View Code

    .net ↓

    protected void dgResource_RowDataBound(object sender, GridViewRowEventArgs e)
            {
                if (e.Row.RowType == DataControlRowType.DataRow)
                {
                    string id = ParamUtil.getstring(dgResource.DataKeys[e.Row.RowIndex]["ResourceID"]);
                    string pid = (e.Row.FindControl("hfdPID") as HiddenField).Value;
                    string level = (e.Row.FindControl("hfdLevel") as HiddenField).Value;
                    string application = (e.Row.FindControl("hfdApplication") as HiddenField).Value;
                    //增加节点的属性
                    e.Row.Attributes.Add("id", id);
                    e.Row.Attributes.Add("pid", pid);
                    e.Row.Attributes.Add("level", level);
            }
    }
    
    
    //点击保存时
    for (int i = 0; i < dgResource.Rows.Count; i++)
    {
        CheckBox chkQuery = (CheckBox)dgResource.Rows[i].FindControl("chk_Query");
        //根据chkQuery的Checked即可获取是否选中,注:半选也算选中
    }
    View Code
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  • 原文地址:https://www.cnblogs.com/AdamLee/p/4106161.html
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