ASP.NET TextBox updated by Javascript not seen

This is going to be easy for someone who knows what they are doing.

I have a launch calendar button, a continue button, and a date textbox. The button launches a JavaScript calendar in a popup window. That calendar returns a date into the ReservationDate textbox field using:

window.opener.document.getElementById('ctl00_wpm_ShowProduct_ctl10_ReservationDate').value =开发者_运维百科 '<%= CurrentDate %>';

I know, it's not elegant but works. The problem is that even though on the browser I see the date in the field, when I hit the continue button and try to access it from my .NET script, the server side script sees it as empty.

How do I tell the server to use the text the browser has in that field that it is not seeing?

I know enough to know that it's a server side versus client side issue but how do I bridge that gap?

I think you have set your textbox as ReadOnly and that seems to be an issue. Set it readonly like this in code behind:

TextBox1.Attributes.Add("readonly", "readonly");

Check this.

If you initialize the value in the Page_Load, the value will get lost. I guess it must be something like that.

So you would write in your Page_Load:

if(!Page.IsPostBack)
{
Initialize();
}