Dynamically enable asp button based on datasource value

Question

SOLVED: See my solution below!

using aspx with C# code behind.

I have the following code in a button in a item template in a gridview:

Enabled='<%# IIF(Eval("wrqst_need_ind") == "Y","TRUE","FALSE") %>'

I am getting the following error:

The name 'IIF' does not exist in the current context

What am I doing wrong? I get the same error if I use "IF" rather than "IIF"

The full item template code is as follows:

<ItemTemplate>
                <asp:Button  ID="wrqst_need_ind_btn" runat="server" Text = "Create WR" 
                    onClientClick="javascript:popUp('popup_createWR.aspx')"  
                    Enabled='<%# IIF(Eval("wrqst_need_ind") == "Y","TRUE","FALSE") %>'
                    CommandArgument='<%# Eval("dvc_nm") + "|" + Eval("data_orgtn_yr") %>'/>
</ItemTemplate>

If I take the line out it works fine.

Seems to me like this should work...

EDIT: I am now using this:

Enabled='<%#Eval("wrqst_need_ind") == "Y" ? "TRUE" : "FALSE" %>'

And geting this error:

The server tag is not well formed.

Thanks so much for your help!

Update:

I tried this:

Enabled='<%# Eval("wrqst_need_ind") == "Y" ? Convert.ToBoolean(1) : Convert.ToBoolean(0) %>' and it ran!

But, every button was disabled. So I tried:

Enabled='<%# Eval("wrqst_need_ind") == "Y" ? Convert.ToBoolean(1) : Convert.ToBoolean(1) %>'

and then every button was disabled. It seems that every time it is returning false... why?

SOLVED: See my solution below!

ChessWhiz · Accepted Answer · 2010-06-28T15:49:01.600

7

In C#, that ternary syntax is:

Eval("wrqst_need_ind") == "Y" ? "TRUE" : "FALSE"

If you happen to be using VB.NET (it looks like you are not), use the If function.

If(Eval("wrqst_need_ind") == "Y", "TRUE", "FALSE")

EDIT: It turns out that == here will not compare the string contents, but the string objects. So, instead, you must use .Equals("Y"). So, community-generated final answer is:

Enabled='<%# Eval("wrqst_need_ind").Equals("Y") %>'

edited Jun 28 '10 at 15:49

answered Jun 25 '10 at 16:05

ChessWhiz

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I'm getting an error converting string to bool... I'm trying a few different variations but i can't seem to get it... – kralco626 Jun 25 '10 at 16:19
my code is: Enabled='<%#Eval("wrqst_need_ind") == "Y" ? "TRUE" : "FALSE" %>' – kralco626 Jun 25 '10 at 16:19
I think you need a space before the "Eval" keyword. Also, I'm not sure if it's case-sensitive, but it should be "true" and "false". – ChessWhiz Jun 25 '10 at 16:26
stil getting the name error using the following code: Enabled='<%# Eval("wrqst_need_ind") == "Y" ? "true" : "false" %>' There is a space between the # and Eval and I made the true and flase lower case? Any other suggestions??? Thanks! – kralco626 Jun 28 '10 at 14:02
check off this as the answer because ChessWhiz should get the credit. However there is a minor technicality. You must use .Equals, not ==. I posted that change in my answer. – kralco626 Jun 28 '10 at 16:21

score 2 · Answer 2 · answered Jun 28 '10 at 14:23

2

This is the code that worked!

Enabled='<%# Eval("wrqst_need_ind").ToString().Equals("Y".ToString()) ? Convert.ToBoolean(1) : Convert.ToBoolean(0) %>'

answered Jun 28 '10 at 14:23

kralco626

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Although as Chris noted this also works: Enabled='<%# Eval("wrqst_need_ind").Equals("Y") %>' Notice that you MUST have the .Equals or it will return false every time. (unless of course the objects are actually the same... but they are not) – kralco626 Jun 28 '10 at 14:32
I feel sad that you accepted your own answer, when it was really my answer that gave the solution to the original 'IIF' question. :) – ChessWhiz Jun 28 '10 at 15:46
wtf... i accepted your answer too... idk why it's not showing it... I was trying to give you credit and let other people know the answer that worked for me... – kralco626 Jun 28 '10 at 16:18
oh lol, guess you can't choose more than one answer as "the answer"... thats kinda silly, what if two people combined to give you the right answer? Well anyways, i checked your answer as the answer instead of mine... Thanks so much for your help :) – kralco626 Jun 28 '10 at 16:19
well i commented on your answer about the .Equals thing so others would see it. That so stupid, I should be able to mark two answers as the answer and have them both apear at the top so people can see the right answerS first... – kralco626 Jun 28 '10 at 16:23

score 1 · Answer 3 · answered Jun 28 '10 at 14:23

1

I'm not sure about all the "Convert.ToBoolean(1)" stuff you've got going on. If you want true and false just write true and false (without quotes or it will be treated as a string).

eg. Enabled='<%#Eval("wrqst_need_ind") == "Y" ? true:false %>'

Of course as I type that it occurs to me that you don't need to use this kind of operator. the condition returns true or false anyway so the above simplifies to:

Enabled='<%#Eval("wrqst_need_ind") == "Y" %>'

answered Jun 28 '10 at 14:23

Chris

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ya not using true or false at all might have worked. However I tried not using quotes and I got some other error. I don't remeber what the error was I tried the other day. However, because the comparison is between two strings .Equals must be used or the expression will always return false. – kralco626 Jun 28 '10 at 14:26

score 0 · Answer 4 · answered Jan 14 '15 at 16:50

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In case it will help anyone else...

This style did not work for me:

(Eval("status").ToString()).Equals("Done")

but this style did work:

(Eval("status").ToString()).Contains("Done")

answered Jan 14 '15 at 16:50

Warren Stevens

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score 0 · Answer 5 · answered Jun 25 '10 at 16:04

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I'm pretty sure the correct keywork is "if" in lowercase.

answered Jun 25 '10 at 16:04

ALOToverflow

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He's using VB, not C# :) `IIF` = "If and only if" – Nick Craver Jun 25 '10 at 16:05
i'm not using vb. i'm using C#. Or at least that was my intention. – kralco626 Jun 25 '10 at 16:22

Dynamically enable asp button based on datasource value

5 Answers5