Request asp:label in code behind

[raghu3]

I have the following sitituation:
aspx: form with

<asp:Label id="txtMoveTo" Font-Name="Arial"
Font-Size="8pt" runat="server"
EnableViewState="True" Text=" " />

The value is set via javascript based on other selections on the form.

Now I need to request this value in code-behind.

str1=Request.Form["txtMoveTo"].Trim();

Get the following error:
System.NullReferenceException: Object reference not set to an instance of an object

If I remove the trim, str1 is null ...
Pls advise

 

[jbenson001]

How about str1 = txtMoveTo.Text;

 

[raghu3]

Does not work: shows the old value

 

[raghu3]

Did the old fashioned way:
Used a hidden variable that is set via javascript and Request this variable as labels are not posted back.
-R

 

[jbenson001]

cool.. glad you got it working

 

[raghu3]

No it does not work:
I set 2 different variables via the JS:

display the vaules in JS alert box:

1. when set: come up fine.

2. On click of Button: value of 1 button gets lost. Value is set on a seperate event: change of a text field.

I am so confused about the sequence.

Any advise ??

-raghu

 

[vbkris]

raghu:
first thing, Request.Form will work ONLY for controls that are rendered as <input type... and <select> controls.

so how are label values preserved in DotNet? it uses the VIEWSTATE hidden field. the values in this can be changed ONLY server side.

therefore u have to use only hidden fields.

now to ur problem:
>> click of Button: value of 1 button gets lost. Value is set on a seperate event: change of a text field.

i dont understand much, could u be a bit more clear?


Known is handfull, Unknown is worldfull

 

[ca8msm]

Yes, as vbkris said you'll need someway of telling the server what the value is.

If you want to inform the user and the server, I'd suggest setting the value of the label and the value of a hidden input field via javascript.


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