How to edit CSS style of a div using C# in .NET

Question

I\'m trying to grab a div\'s ID in the code behind (C#) and set some css on it. Can I grab it from the DOM or do I have to use some kind of control?

        
                      

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Answer 1

Make sure that your div is set to runat="server", then simply reference it in the code-behind and set the "class" attribute.

<div runat="server" id="formSpinner">
   ...content...
</div>

Code-behind

formSpinner.Attributes["class"] = "class-name";

Answer 2

Add runat to the element in the markup

<div id="formSpinner" runat="server">
    <img src="images/spinner.gif">
    <p>Saving...</p>
</div

Then you can get to the control's class attributes by using formSpinner.Attributes("class") It will only be a string, but you should be able to edit it.

Answer 3

To expand on Peri's post & why we may not want to use viewstate the following code:

style="<%= _myCSS %>"

Protected _myCSS As String = "display: none"
Is the approach to look at if you're using AJAX, it allows for manipulating the display via asp.net back end code rather than jquery/jscript.