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;
            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;