[ASP.net/jQuery] CheckBox仿視窗程式的綠色填滿樣式

2011-08-19

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ASP.net MVC
2011-08-21

因為論壇上有人發表請問TreeView是否能做到判斷底下子節點是否全選?

讓我想到Web的CheckBox要做到像視窗程式相同的樣式，預設應該不可能

所以便尋找解決方案

找來找去，該綠色填滿樣式的CheckBox還真難找

後來還是借用Dynatree的方案

Dynatree主要藉由以下圖片和CSS的搭配來實現客制化的CheckBox


 * Common icon definitions
 */
span.dynatree-checkbox,/*checkbox*/
span.dynatree-radio /*radio*/
{
	width: 16px;
	height: 16px;
	display: -moz-inline-box; /* @ FF 1+2 */
	display: inline-block; /* Required to make a span sizeable */
	vertical-align: top;
	background-repeat: no-repeat;
	background-position: left;
	background-image: url("icons.gif");
	background-position: 0 0;
}

/*******************************************************************************
 * Checkbox icon
 */
span.dynatree-checkbox
{/*預設樣式*/
 
	background-position: 0px -32px;
}
span.dynatree-checkbox:hover
{/*預設滑鼠移過*/
	background-position: -16px -32px;
}

.dynatree-partsel span.dynatree-checkbox
{/*綠色方塊*/
	background-position: -64px -32px;
}
.dynatree-partsel span.dynatree-checkbox:hover
{/*綠色方塊滑鼠移過*/
	background-position: -80px -32px;
}

.dynatree-selected span.dynatree-checkbox
{/*勾選狀態*/
	background-position: -32px -32px;
}
.dynatree-selected span.dynatree-checkbox:hover
{/*勾選狀態滑鼠移過*/
	background-position: -48px -32px;
}

/*******************************************************************************
 * Radiobutton icon
 * This is a customization, that may be activated by overriding the 'checkbox'
 * class name as 'dynatree-radio' in the tree options.
 */
span.dynatree-radio
{
	margin-left: 3px;
	background-position: 0px -48px;
}
span.dynatree-radio:hover
{
	background-position: -16px -48px;
}

.dynatree-partsel span.dynatree-radio
{
	background-position: -64px -48px;
}
.dynatree-partsel span.dynatree-radio:hover
{
	background-position: -80px -48px;
}

.dynatree-selected span.dynatree-radio
{
	background-position: -32px -48px;
}
.dynatree-selected span.dynatree-radio:hover
{
	background-position: -48px -48px;
}

依照CSS的規則所以畫面大概長這樣(WebForm)

由於CheckBox是圖片，並不是真正的控制項，所以必須再準備一個HiddenField來儲存每次jQuery勾選、勾消的狀態



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
      <script src="../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
      <link href="../Content/ui.dynatree.css" rel="stylesheet" type="text/css" />
        <script type="text/javascript">

            $(document).ready(init);

            function init() {


                $("#spanContainer").click(
             function () {
                 if ($(this).hasClass("dynatree-partsel")) {

                     $(this).removeClass("dynatree-partsel");
                     $("#<%= first.ClientID %>").val("");
                 } else {
                     $(this).addClass("dynatree-partsel");
                     $("#<%= first.ClientID %>").val("綠色填滿樣式打勾");
                 }
             });


                $("#spanContainer2").click(
             function () {
                 if ($(this).hasClass("dynatree-selected")) {
                     $(this).removeClass("dynatree-selected");
                     $("#<%= second.ClientID %>").val("");
                 } else {
                     $(this).addClass("dynatree-selected");
                     $("#<%= second.ClientID %>").val("一般樣式打勾");
                 }
             });

            }

      
    
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <asp:Literal id="li_Result" runat="server" />
    <br />

    <span id="spanContainer"  >
      <span id="span_id" class="dynatree-checkbox"></span>綠色填滿樣式<asp:HiddenField ID="first" runat="server"  Value="" />
    </span>
    <br />
    

    <span id="spanContainer2" >
      <span id="span_id2" class="dynatree-checkbox"></span>一般樣式<asp:HiddenField runat="server" ID="second" Value="" />
    </span>
    <br />


    <asp:Button Text="送出" ID="btn_Go" runat="server" onclick="btn_Go_Click"  />

    </form>
</body>
</html>

Code-Behind：


using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace CheckBoxDemo.WebForm
{
    public partial class CheckBoxWebForm : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btn_Go_Click(object sender, EventArgs e)
        {
            li_Result.Text = first.Value + "<hr />" + second.Value + "<hr />";
            
        }
    }
}

執行結果：

全部都打勾

按送出

不過這樣的程式有Bug，因為若再”只”點選「一般樣式」

按「送出」，

因為ViewState被記住的關係，「綠色填滿樣式」的CheckBox仍然還是被判為打勾

所以再改寫script



            $(document).ready(init);

            function init() {
                /*加以下兩段*/
                $("#first").val("");
                $("#second").val("");

                $("#spanContainer").click(
             function () {
                 if ($(this).hasClass("dynatree-partsel")) {

                     $(this).removeClass("dynatree-partsel");
                     $("#<%= first.ClientID %>").val("");
                 } else {
                     $(this).addClass("dynatree-partsel");
                     $("#<%= first.ClientID %>").val("綠色填滿樣式打勾");
                 }
             });


                $("#spanContainer2").click(
             function () {
                 if ($(this).hasClass("dynatree-selected")) {
                     $(this).removeClass("dynatree-selected");
                     $("#<%= second.ClientID %>").val("");
                 } else {
                     $(this).addClass("dynatree-selected");
                     $("#<%= second.ClientID %>").val("一般樣式打勾");
                 }
             });

            }

      
    
    </script>

這樣執行就正常了(不能夠在Page_Load事件去清除hidden的Value，那會導致每次Postback後讀取出來的hidden的Value都是空字串)

接著再看MVC 2的畫面配置



<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    Demo
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <script src='<%= Url.Content("~/Scripts/jquery-1.4.1.min.js") %>' type="text/javascript"></script>
    <link href='<%= Url.Content("~/Content/ui.dynatree.css") %>' rel="stylesheet" type="text/css" />
    <script type="text/javascript">

        $(document).ready(init);

        function init() {
             $("#first").val(""); /*一樣要加上此兩行，在畫面讀取完畢時清除hidden的Value*/
             $("#second").val("");/*不然使用者按上一頁，再送出頁面，仍會送出上一次的結果*/

            $("#spanContainer").click(
             function () {
                 if ($(this).hasClass("dynatree-partsel")) {

                     $(this).removeClass("dynatree-partsel");
                     $("#first").val("");
                 } else {
                     $(this).addClass("dynatree-partsel");
                     $("#first").val("綠色填滿樣式打勾");
                 }
             });


            $("#spanContainer2").click(
             function () {
                 if ($(this).hasClass("dynatree-selected")) {
                     $(this).removeClass("dynatree-selected");
                     $("#second").val("");
                 } else {
                     $(this).addClass("dynatree-selected");
                     $("#second").val("一般樣式打勾");
                 }
             });

        }

      
    
    </script>
    <% using (Html.BeginForm("Result", "Home", FormMethod.Post))
       { %>
    <span id="spanContainer"><span id="span_id" class="dynatree-checkbox"></span>綠色填滿樣式
    </span>
    <%: Html.Hidden("first") %>
    <br />
    <br />
    <span id="spanContainer2"><span id="span_id2" class="dynatree-checkbox"></span>一般樣式
    </span>
    <%: Html.Hidden("second") %>
    <br />
    
    <input type="submit" value="提交" />
    <%} %>
</asp:Content>

HomeController.cs


using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace CheckBoxDemo.Controllers
{
    [HandleError]
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            ViewData["Message"] = "歡迎使用 ASP.NET MVC!";

            return View();
        }


        [HttpPost]
        public ActionResult Result(FormCollection form)
        {
            ViewData["first"] = form["first"];
            ViewData["second"] = form["second"];

            return View();
        }
    }
}

Result.aspx View



<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
	Result
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <h2>Result</h2>
    剛才打勾的結果：<br /><hr />
    <%: ViewData["first"]%>
    <br />
    <%: ViewData["second"]%>
</asp:Content>

執行結果：