dropdownlist not retaing value

[rotsey]

HI,

I have a dropdownlist on a page that is not retaining its value on postback. i have other controls on the page that are.

I have some javascript in the page but cannot see that I am doing any thing to it.

Anyone have any ideas??
rotsey

 

[ca8msm]

Is it being bound on PostBack?

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[rotsey]

yes it is. Looking at the source on postback there are values in it.

 

[ca8msm]

Well if it's being bound on PostBack then it will not retain the value that the user selected (as it is being bound again the first item will be selected).

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[rotsey]

well it works on another dropdownlist on the same page.

I am creating a large table with lots of rows and cells so I am using code to load a table control. so to get it to build my table on postback I have to call the load function each time like this.

   Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

     BuildTable()
     If not IsPostback Then
        'do what ever
     End if

   End Sub

It is in BuildTable that the dropdownlists get created and filled. On local machine they retain values on postback.

It is only now I have uploaded to the web host that I have a problem with this combo.

rotsey

 

[ca8msm]

Well if the DropDownList gets called in BuildTable then it will get bound everytime the page is loaded (including postbacks) which means it will get reset each time.

I would suggest seperating the DropDownList bind into another function and only calling it when it is not a postback.

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[rotsey]

what you say makes sense but why does it work on other controls and the same control works on my local server??

 

[ca8msm]

I really don't know. Binding a control on every load should mean that the viewstate from the previous page is overwritten.

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[rotsey]

hmmmm.

btw ca8msm I get a javascript debug message box when I load pages am on this site. I have IE 6.0.


Do you get that??

 

[ca8msm]

No I don't - I have FireFox and IE6.

What are the javascript errors?

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[rotsey]

It seems just this page

Line 17
Error Expected ';'


Anyhow thanks for the dropdownlist fix. Works well now.

 

[ca8msm]

No probs.

I can't replicate the error here. If it keeps occuring you can log it with management using the Contact Us link in the top right hand corner of the page.

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