ASP.NET TextBox Control Dilema

johne · April 18th, 2005, 10:56 PM

Hi everyone.

I am currently working on a ASP/VB.NET app and I am having an issue with ASP.NET forms and the submission of them. I am currently using a TextControl in an ASPX page and when I try and populate this field with a value, the value appears HOWEVER if a user changes this value in the Text input type and re-submits the form the OLDER default value is sent to the SERVER. In standard HTML/ASP setting a value property of an text input box still did not prevent users from over-riding it on submission of a form.

Example Code:

''''TextControl in my ASPX page

<asp:TextBox ID="txtName" Runat="server" width="200px" />

''''From within an ASPX.VB page I set the control's Text attribute

txtName.Text = "John"

When the ASPX page loads the default value is pre-loaded as "John". Exactly what I want HOWEVER the issue I am having is when someone changes this value and re-submits the FORM the value is not getting passed in its changed form. Every submission passes a txtName.Text value of "John"!

Any help or ideas would be greatly appreciated.

Regards,

J

Santhi · April 18th, 2005, 11:33 PM

It is because you are setting the textbox value as John in Page_Load.Remove that line and set the initial value in the <asp:textbox> tag itself.

johne · April 19th, 2005, 12:02 AM

Quote:

quote:Originally posted by Santhi
It is because you are setting the textbox value as John in Page_Load.Remove that line and set the initial value in the <asp:textbox> tag itself.

Hmmm no I am thinking.

Being a former ASP programer moving to ASP.Net has been a challenge.
Considering the page I am loading is totally dynamic how do I set the value within the textbox itself.
<asp:TextBox ID="txtName" Runat="server" width="200px">John</asp:TextBox> sounds simply however my next question is how do I pass in string "John", I tried passing it by a Label Control i.e. forcing a server populated Label control in between the TextBox control. This results in an error.

You mention to: set the initial value in the <asp:textbox> tag itself.

Can you show me a code snippet? Presently I have managed to solve my problem using JavaScript and the Javascript onLoad event, but my preference would be to get this working MINUS the Javascript.

Thanks again.

Santhi · April 19th, 2005, 12:38 AM

Hi find below my code snippet
<asp:TextBox ID="txtName" Runat="server" Text="John" width="200px"></asp:TextBox>

planoie · April 19th, 2005, 08:13 AM

j,

The problem is where you are setting the default value. Chances are pretty good that the assignment is happening every time the page runs. This is what's causing the default to override the user value. The user values are processed after the page is built but before the Load event. So basically anyplace in the page where you'd make that assignment will override the user modified value.

You have a couple options:
1. Use what Santhi has described: set the default in the markup. This way, the user value will get accepted when the page posts back.

2. Wrap your default assignment in:
If Not IsPostback Then ...
This will result in only setting your default value on the initial page hit and not subsequent postbacks.

-Peter