Keeping dropdown list state
I have a simple dropdown list which if selected, I have a selected index changes action to redirect the page back on itself with a request variable.
My problem is that once I have selected the value and the page has redirect and performed any relevant functions the dropdown list goes back to its defaul value, How do I keep the value selected. (is this view state that I have been hearing about?). Should be a simple one as I'm sure people do it all the time.
My problem is that once I have selected the value and the page has redirect and performed any relevant functions the dropdown list goes back to its defaul value, How do I keep the value selected. (is this view state that I have been hearing about?). Should be a simple one as I'm sure people do it all the time.
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
<asp:ListItem Selected="True" Value="0">£0</asp:ListItem>
<asp:ListItem Value="20">£20</asp:ListItem>
<asp:ListItem Value="40">£40</asp:ListItem>
<asp:ListItem Value="60">£60</asp:ListItem>
<asp:ListItem Value="80">£80</asp:ListItem>
<asp:ListItem Value="100">£100</asp:ListItem>
<asp:ListItem Value="120">£120</asp:ListItem>
<asp:ListItem Value="140">£140</asp:ListItem>
</asp:DropDownList>
===== on selected index changed ====
Response.Redirect(CurrentPage.SessionField = "?MinPrice=" + DropDownList1.SelectedValue )
It looks like you need to keep the state in the code behind page. There is a Page_Load method and you need to extract the value from that and then set the SelectedIndex field to that value. That would keep the state variable.
ASKER
I would like the dropdownlist to display the value that was selected . i.e £20 , the page goes of onto itself, takes the value from the request field to set the value and it shows £20 rather than reverting back to £0.
If you want to display the selected value, just add a Label on the page, say Label1. then in your DDL's SelectedIndexChanged event handler, add this line instead of redirecting to the page itsefl:
Label1.Text = DropDownList1.SelectedValu
Label1.Text = DropDownList1.SelectedValu
ASKER
Rrooter, have you nay pointers as how I do that.
I have tried to set dropdown selectedvalue in page load, but this does not appear to work. are there any examples I can look at
I have tried to set dropdown selectedvalue in page load, but this does not appear to work. are there any examples I can look at
Did you try my suggestion?
ASKER
Codingbeaver, I still need to have the page redirect as there are several variables I populate to resubmit the page. I woould just like the refreshed page to start with a new dropdown value. Thanks for the suggestion
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ASKER
That's great that works. do you know why that would work but when I use the Request Minprice for the URL redirect (www.site1.co.uk?MinPrice=£40 it does not work.
If you can answer great, if not I will still accept the above as the correct solution cheers
If you can answer great, if not I will still accept the above as the correct solution cheers
It is because SelectedValue is the value of the dropdownlist item's value, which does not have a currency symbol, according to your DDL's code. You can change your DDL's value to be the same as the text and should be able to get it work.
ASKER
Thanks
ASKER
Very helpfull thanks
What are you trying to accomplish?