Web用户控件开发--星型评分控件

本文中分享一个实现简单，使用方便的星型评分控件。

一：贴几张测试图片先：

二、星型评分控件的实现：

RatingBar.ascx：

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="RatingBar.ascx.cs" Inherits="UserControls.Controls.RatingBar" %>

<style type="text/css">

        .rating {

            float:left;

        }

        .rating:not(:checked) > input {

            position:absolute;

            top:-9999px;

            clip:rect(0,0,0,0);

        }

        .rating:not(:checked) > label {

            float:right;

            width:1em;

            padding:0 .1em;

            overflow:hidden;

            white-space:nowrap;

            cursor:pointer;

            font-size:150%;

            line-height:1.2;

            color:#ddd;

            text-shadow:1px 1px #bbb, 2px 2px #666, .1em .1em .2em rgba(0,0,0,.5);

        }

        .rating:not(:checked) > label:before {

            content: '★ ';

        }

        .rating > input:checked ~ label {

            color: #f70;

            text-shadow:1px 1px #c60, 2px 2px #940, .1em .1em .2em rgba(0,0,0,.5);

        }

        .rating:not(:checked) > label:hover,

        .rating:not(:checked) > label:hover ~ label {

            color: gold;

            text-shadow:1px 1px goldenrod, 2px 2px #B57340, .1em .1em .2em rgba(0,0,0,.5);

        }

        .rating > input:checked + label:hover,

        .rating > input:checked + label:hover ~ label,

        .rating > input:checked ~ label:hover,

        .rating > input:checked ~ label:hover ~ label,

        .rating > label:hover ~ input:checked ~ label {

            color: #ea0;

            text-shadow:1px 1px goldenrod, 2px 2px #B57340, .1em .1em .2em rgba(0,0,0,.5);

        }

        .rating > label:active {

            position:relative;

            top:2px;

            left:2px;

        }

    </style>

<span class="rating">

    <input type="radio" id="star5" name="rating" value="5" runat="server" /><label for="<%=this.ClientID + "_star5"%>"

        title="5分">5 stars</label>

    <input type="radio" id="star4" name="rating" value="4" runat="server" /><label for="<%=this.ClientID + "_star4"%>"

        title="4分">4 stars</label>

    <input type="radio" id="star3" name="rating" value="3" runat="server" /><label for="<%=this.ClientID + "_star3"%>"

        title="3分">3 stars</label>

    <input type="radio" id="star2" name="rating" value="2" runat="server" /><label for="<%=this.ClientID + "_star2"%>"

        title="2分">2 stars</label>

    <input type="radio" id="star1" name="rating" value="1" runat="server" /><label for="<%=this.ClientID + "_star1"%>"

        title="1分">1 star</label>

</span>

RatingBar.ascx.cs:

using System;

namespace UserControls.Controls

{

    public partial class RatingBar : System.Web.UI.UserControl

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            SyncInterfaceByReadOnlyProperties();

        }

        public Grade Value

        {

            get

            {

                if (star5.Checked)

                {

                    return Grade.Five;

                }

                else if (star4.Checked)

                {

                    return Grade.Four;

                }

                else if (star3.Checked)

                {

                    return Grade.Three;

                }

                else if (star2.Checked)

                {

                    return Grade.Two;

                }

                else if (star1.Checked)

                {

                    return Grade.One;

                }

                else

                {

                    return Grade.Zero;

                }

            }

            set

            {

                star5.Checked = false;

                star4.Checked = false;

                star3.Checked = false;

                star2.Checked = false;

                star1.Checked = false;

                switch (value)

                {

                    case Grade.Five:

                        star5.Checked = true;

                        break;

                    case Grade.Four:

                        star4.Checked = true;

                        break;

                    case Grade.Three:

                        star3.Checked = true;

                        break;

                    case Grade.Two:

                        star2.Checked = true;

                        break;

                    case Grade.One:

                        star1.Checked = true;

                        break;

                    default:

                        break;

                }

            }

        }

        public bool ReadOnly

        {

            set

            {

                this.ViewState["ReadOnly"] = value;

                SyncInterfaceByReadOnlyProperties();

            }

            get

            {

                object obj = this.ViewState["ReadOnly"];

                if (obj == null)

                {

                    return false;

                }

                else

                {

                    return (bool)obj;

                }

            }

        }

        private void SyncInterfaceByReadOnlyProperties()

        {

            if (this.ReadOnly)

            {

                star1.Attributes.Add("disabled", "disabled");

                star2.Attributes.Add("disabled", "disabled");

                star3.Attributes.Add("disabled", "disabled");

                star4.Attributes.Add("disabled", "disabled");

                star5.Attributes.Add("disabled", "disabled");

            }

            else

            {

                star1.Attributes.Remove("disabled");

                star2.Attributes.Remove("disabled");

                star3.Attributes.Remove("disabled");

                star4.Attributes.Remove("disabled");

                star5.Attributes.Remove("disabled");

            }

        }

    }

    public enum Grade

    {

        Zero = 0,

        One = 1,

        Two = 2,

        Three = 3,

        Four = 4,

        Five = 5

    }

}

三、控件使用演示：

为RatingBar控件赋值：

RatingBar1.Value = Grade.Three;

打印RatingBar控件的值：

ClientScript.RegisterStartupScript(this.GetType(), null, string.Format("<script>alert('{0}');</script>", RatingBar1.Value));

RatingBar控件的ReadOnly属性（属性值取反）：

RatingBar1.ReadOnly = !RatingBar1.ReadOnly;