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Using CSS and Changing them Dynamically ASP.NET & C#
This tutorial shows how to implement CSS StyleSheet usage with ASP.NET and how to change them dynamically. C# version.
This tutorial will show how easy it is to implement CSS stylesheets to an ASPX page, and also how to let the user dynamically change the look and feel of the website in an instant. In the example below, we use radio buttons to change between a light and a dark look to the website. This is done with two separate CSS files:
Two simple example CSS files are as follows.
Dark.css:
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body
{
color: #cc0033;
background-color: #996666; }
.reverse
{
background-color: White;
color: Maroon; } |
Light.css:
body
{
background-color: White;
color: Black; }
.reverse
{
background-color:Black;
color:White; } |
To attach the StyleSheet, we add the following code inside the <head> tags:
| <link href="dark.css" rel="stylesheet" type="text/css" id="stylesheet" /> |
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The ASPX code will look something like this.
Notice the radio buttons' OnCheckedChanged attributes.
<form id="form1" runat="server">
<div>
<asp:Label ID="CaptionLabel" runat="server" Style="font-size: 1.2em; font-family: Arial, 'Times New Roman', Verdana; background-color: #99ffff" Text="Label"></asp:Label> <asp:TextBox ID="NumberTextbox" runat="server" Style="background-color:Blue; color:Yellow;"></asp:TextBox> <asp:Label ID="ResultLabel" runat="server" Text="Label" CssClass="reverse"></asp:Label> <asp:RadioButton ID="radioLight" runat="server" AutoPostBack="True" GroupName="grpSelectStylesheet" OnCheckedChanged="SwitchStylesheets" Text="Light" /> <asp:RadioButton ID="radioDark" runat="server" AutoPostBack="True" Checked="True" GroupName="grpSelectStylesheet" OnCheckedChanged="SwitchStylesheets" Text="Dark" />
</form> |
The code simply switches the StyleSheets upon radiobutton click. The code-behind should look something like this:
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e) { } protected void SwitchStylesheets(object sender, EventArgs e) {
if (radioDark.Checked)
stylesheet.href="dark.css"; if (radioLight.Checked)
stylesheet.href="light.css"; } |
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