ASP.NET TextBox updated by Javascript not seen

Question

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 = '<%= 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?

Do you have any other code hat may be overwriting that value earlier in the page lifecycle? — Roman
– Roman, Commented Apr 26, 2011 at 15:40
If you're able to see the text in the field before you submit the postback, then I think something is probably wrong in your code behind. You're probably not checking IsPostBack Can you post that code as well? — jessegavin
– jessegavin, Commented Apr 26, 2011 at 15:41
@Chad, than he wouldn't be able to compile He sees it as empty, not as inexisting — Karel
– Karel, Commented Apr 26, 2011 at 15:42
Yeah i put that together when i reread and looked at the control name. — Chad
– Chad, Commented Apr 26, 2011 at 15:44
it would be a good idea to post your html, and server side script too. do you have runat="server" in the textbox declaration? when you try to access the textbox, is it found on the server? — rucsi
– rucsi, Commented Apr 26, 2011 at 15:46

gbs · Accepted Answer · 2011-04-26 15:42:02Z

3

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.

answered Apr 26, 2011 at 15:42

gbs

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1 Comment

Deverill Over a year ago

Brilliant gbs! It threw me off that I could see the value onscreen and never considered readonly. Thank you for solving a problem that's making me crazy this week... I'm sure there will be a new one next week. :)

Karel · Accepted Answer · 2011-04-26 15:41:09Z

1

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();
}

answered Apr 26, 2011 at 15:41

Karel

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1 Comment

jessegavin Over a year ago

I would be willing to bet that this is the problem. Hard to tell without seeing the code though.

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