Obtaining CSS styles in the code-behind of an ASP.NET application

Is it possible to retrieve CSS styles from a styles.css file in ASP.NET C# code behind, or is a workaround necessary? I haven't been able to find a solution online.

While utilizing themes in my web application, I also require server-side processing and access to color information from CSS files. These colors will be unique to each user, so a method of retrieving them is essential.

Answer №1

To retrieve the current styles, you can use the following method:

const element = document.querySelector("#yourElement");
const styles = window.getComputedStyle(element);
const backgroundColor = styles["background-color"];
document.getElementById("currentBackgroundColor").innerHTML = backgroundColor;

After getting the color value, you can send it back to the server. This can be done by sending a JSON payload using an XHR request or by setting it as a hidden input element in a form:

<input type="hidden" name="currentBackgroundColor" id="currentBackgroundColor" />

Answer №2

Code snippet for handling Button Click event in C#

    protected void Button1_Click(object sender, EventArgs e)
        {
            Panel1.CssClass = "RedBackground";
            Panel1.Style.Add("font-size", "200%");
/// getting value from Panel1 attributes
            string pvalue = Panel1.Attributes["class"] ;
 or 
         btn_4.Attributes.CssStyle["property"]
        }

Style override in HTML file

<style type="text/css>
    .RedBackground
    {
        background-color: Red;
    }


<asp:Panel ID="Panel1" runat="server">
Hello
</asp:Panel>

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