ViewState, div tags

Question

Hi,

I have several Div tags on a page which are dynamic, i.e. depending on certain criteria they are either visible to the user or not. I want to add them to the page's view state so that upon postback they are not hidden again, how do I do this?

Answer 1

ViewState["divAVisible"] = true;
ViewState["divBVisible"] = false;

Then within Page_Load:

if (ViewState.ContainsKey("divAVisible"))
    divA.Visible = ViewState["divAvisible"]
...

The divA is defined as Panel

Alternatively, you can put something like:

<div id="divA" runat="server">...</div>

in your aspx and then it will become an instance of HtmlControl generated by VS.

Answer 2

From what I understand from the question it would seem you want to mark the DIVs as server controls. So declaring your divs with runat="server".

<div id="testpanel" runat="server"></div>

Or alternatively you could use an asp:panel. Then when you hit Page_Load of your page you can test for the postback and change the visibility accordingly.

 protected void Page_Load(object sender, EventArgs e)
 {
    if (Page.IsPostBack)
    {
        testpanel.Visible = true;
    }
 }

But then again, if you don't want it as a server control this solution wouldn't work.

Answer 3

I would just use ASP.NET panels instead of divs if you are going the viewstate route. They render as div's so they would be exactly what you want.