Can you tell me please what is wrong with this code??? About to getting crazy!!!
<asp:LinkButton ID="LinkButton1" OnClick="DivAc('griddiv')" Font-Size="Smaller" runat="server" CommandName='<%# Eval("harf").ToString().ToUpper()%>'><%# Eval("harf").ToString().ToUpper() %></asp:LinkButton>
Error: Too many characters in character literal... :(
Is DivAc('griddiv') a javascript function?
Then you have to use OnClientClick instead of OnClick.
OnClick is reserved for .NET functions. With OnClientClick you generates the OnClick-attribute in HTML.
This is probably a bit confusing.
So this is what you have to do:
<asp:LinkButton ID="LinkButton1" OnClientClick="DivAc('griddiv')" Font-Size="Smaller" runat="server" CommandName='<%# Eval("harf").ToString().ToUpper()%>'><%# Eval("harf").ToString().ToUpper() %></asp:LinkButton>
The immediate issue is that you placed a string (griddiv) in character quotes (a single quote, in C#, is for a single character only). You would need to write something like OnClick="DivAc(\"griddiv\")"
BUT
OnClick is a server-side event handler that takes the name of a public or protected function that takes (object,EventArgs) and returns void. So this won't compile anyway.
Where is DivAc? In JavaScript? If so, you want OnClientClick, in which case you can leave the single and double quotes as they are.
I think that your error is here:
CommandName='<%# Eval("harf").ToString().ToUpper()%>'><%# Eval("harf").ToString().ToUpper() %></asp:LinkButton>
I think that its should be:
CommandName='<%# Eval("harf").ToString().ToUpper()%'></asp:LinkButton>
Related
I've been trying to validate a multiline textbox. And of course it doesn't work.
<asp:TextBox ID="t_noteTextBox" runat="server" Width="700" Text='<%# Bind("t_note") %>' TextMode="MultiLine" Rows="3" MaxLength="700" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ErrorMessage="Special Characters not allowed." ForeColor="Red"
ControlToValidate="t_noteTextBox" ValidationExpression="(?m)([a-z]|[A-Z]|[0-9]|[ ]|[-]|[_]|[.]|[,]|[\r]|[\n])*" Display="Dynamic"></asp:RegularExpressionValidator>
<asp:RegularExpressionValidator runat="server" ID="valInput" ControlToValidate="t_noteTextBox" ValidationExpression="^[\s\S]{0,740}$"
ErrorMessage="Please enter a maximum of 740 characters" Display="Dynamic" ForeColor="Red"></asp:RegularExpressionValidator>
The expression works fine as long as I don't add a carriage return. As soon as I go to a new line i get an error.
I even looked up and found the ?m multiline option.
however that doesn't work either.
Testing the regex in Expresso works well.
(?m)([a-z]|[A-Z]|[0-9]|[ ]|[-]|[_]|[.]|[,]|[\r]|[\n])*
But as soon as I put it on the website it doesn't.
Any ideas?
Multiline mode alters the behavior of the anchors (^ or $), which you aren't using.
Singleline mode causes the dot metacharacter to match everything including linefeeds, but you aren't using the dot that way. Like most metacharacters, the dot loses its special meaning inside a character class, so [.] just matches a literal ..
I suspect your problem is that you're allowing the validation to be done on the client side. That is, you haven't set EnableClientScript to "false". Client-side validation uses JavaScript instead of .NET, and the JavaScript regex flavor doesn't support inline modifiers like (?m) and (?s). But that shouldn't matter to you, since you aren't using the dot as a metacharacter.
This should be all you need:
ValidationExpression="[a-zA-Z0-9_.,\s-]*"
You can simplify this quite a bit.
(?m)([\w., -])*
The multiline flag (?m) only allows the anchors ^ and $ to match before and after linebreaks, as opposed to start and end of string normally, so it's not doing what you want here.
If you use \s instead of matching a space, it will match the newline as well.
([\w.,\s-])*
I am new in W3c validations, I am trying to fix this error but it's not happening. The error is following:
character "&" is the first character of a delimiter but occurred as data.
I am using DataList Control to bind data and here is the line where the w3c validation error occurs.
<asp:Label ID="lblDescription"
runat="server"
Text='<%#Eval("Decr") %>'>
</asp:Label>
In database, the Decr is stored and this(&) special character is also given in the description field. w3c is not validating this line.
& is a special charater for concat, you need to escape it: make them all & not &.
Here is the solution I came up with:
<asp:Label ID="lblDescription" runat="server" Text='<%# Server.HtmlEncode( (string) Eval("Decr")) %>'></asp:Label>
I am trying to place a * next to the name based on a condition.
My code :
<asp:Label ID="lblOne" runat="server" Text= '<%# Eval("name") + ((Eval("StatusId").Equals(0) && Eval("assignfilename") == null) ? " *" : "") %>' > </asp:Label>
Thanks
BB
I'm not really familiar with in-line codes and your code seems to be a bit complicated.
But I also need to concatenate an Eval("record") and a text. So to answer the question on how to concatenate, ampersand worked for me.
'<%# Eval("name") & " *" %>'
hope this helps anyone.
If you're pushing the limits of what you can easily handle with inline code, you could always write a function instead. Then you can do something like:
<asp:Label ID="lblOne" runat="server" Text= '<%# EmitSomeText(Eval("name"), Eval("StatusId"), Eval("assignfilename")) %>' />
This lets you break a complex expression up into however many lines it needs to be, which can be a little less awkward. You can use a function in your CodeBehind or any other class.
If you're binding to a class that you have access to, you could add a readonly property. Then you can do something like Eval("MyNewProperty").
I use that for exposing formatting that I need to re-use. For instance, Customer.CustomerFullName might return last name first seperated be a comma (intelligently handling situations where one or the other or both are missing) plus an optional title, since maybe my customers are medical folks and some of them have PhDs and MDs.
For simple one-off scenarios the code-behind function works okay.
You may also want to consider coding them as a property in the underlying object.
For example, if the text generated is going to be used in more than one instance, you'd need to code the function with Evals several times in different forms or controls.
I would create a property on the data object, e.g. NameWithStatusStar, then your label can be bound directly to the property with the code inside Eval("NameWithStatusStar")
This is more descriptive and reusable than a series of expressions, plus it's easier to change (e.g. add another field, change the formula etc.)
You can do it like this:
Text='<%#"CustomText "+Eval("Name")%>'
Text='<%#String.Concat(Eval("UserId"), Eval("Username")) %>'
This worked for me in my project. Found it here:
Concatenate text with Eval
Text='<%# string.Concat(Eval("FirstName"), " ", Eval("LastName"))%>'
This worked for me in my project. Found it here:
Concatenate text with Eval
What is the use of Eval() in ASP.NET?
While binding a databound control, you can evaluate a field of the row in your data source with eval() function.
For example you can add a column to your gridview like that :
<asp:BoundField DataField="YourFieldName" />
And alternatively, this is the way with eval :
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lbl" runat="server" Text='<%# Eval("YourFieldName") %>'>
</asp:Label>
</ItemTemplate>
</asp:TemplateField>
It seems a little bit complex, but it's flexible, because you can set any property of the control with the eval() function :
<asp:TemplateField>
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server"
NavigateUrl='<%# "ShowDetails.aspx?id="+Eval("Id") %>'
Text='<%# Eval("Text", "{0}") %>'></asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
Eval is used to bind to an UI item that is setup to be read-only (eg: a label or a read-only text box), i.e., Eval is used for one way binding - for reading from a database into a UI field.
It is generally used for late-bound data (not known from start) and usually bound to the smallest part of the data-bound control that contains a whole record. The Eval method takes the name of a data field and returns a string containing the value of that field from the current record in the data source. You can supply an optional second parameter to specify a format for the returned string. The string format parameter uses the syntax defined for the Format method of the String class.
IrishChieftain didn't really address the question, so here's my take:
eval() is supposed to be used for data that is not known at run time. Whether that be user input (dangerous) or other sources.
In asp.net, I need to add a validator to a textbox that forces the input to be numbers.
Is this built in?
I have already added a required field validator to the textbox.
You could use a Regex Validator to ensure the text is numeric
I think the regex would be
[0-9]*
e.g.
<asp:TextBox ID="tbxNumbers" runat="server" />
<asp:RegularExpressionValidator ID="revNumericValidator" runat="server"
ValidationExpression="^[0-9]*$" ControlToValidate="tbxNumbers" ErrorMessage="Must be Numeric" />
EDIT:
As the other two posters also pointed out you can also use \d to represent a Numeric Character
<asp:RegularExpressionValidator runat="server"
ControlToValidate="numbersOnlyTextBox"
ErrorMessage="Enter only numeric characters."
ValidationExpression="^\\d+$" />
Use a range validator.
<asp:TextBox ID="MyTextBox" MaxLength="4" Width="75"
Text="0" runat="server"></asp:TextBox>
<asp:RangeValidator ID="MyRangeValidator" Display="Static" Type="Integer"
MaximumValue="9999" MinimumValue="0" EnableClientScript="true"
ControlToValidate="MyTextBox" runat="server" SetFocusOnError="true"
ErrorMessage="Ooops"></asp:RangeValidator>
This permits you to use numbers with decimal places (by using Type="Double" or "Currency"), or other kinds of numbers that Windows recognizes.
Check MSDN for more info on the Range Validator Control.
I think there needs to be more clarification of the requirements here. What kind of numbers are we talking about? Positive integers? Any integer? A number with a decimal place? What about commas in the number (1,000)?
I recommend a RegularExpressionValidator to do your work, but these questions make a difference when it comes to which RegEx you use.
In order to provide a better user experience, another thing to add is an AjaxToolkit FilteredTextBox extender, with a FilterType of either "Custom, Numbers" or just "Numbers". The first choice is for when you want to be able to specify decimal points and negative numbers. In that case you must also specify the ValidChars attribute with something like "-.". This will stop a user from entering characters that are not going to make up a valid number such as -123.45 . Note that it does not stop the user from entering the '-' & '.' in incorrect places e.g. "2-..-3" can still be entered. You will need the validators mentioned in other answers to catch these cases.
<ajaxToolkit:FilteredTextBoxExtender ID="ftbe" runat="server"
TargetControlID="numbersOnlyTextBox"
FilterType="Custom, Numbers"
ValidChars="-." />
Or
<ajaxToolkit:FilteredTextBoxExtender ID="ftbe" runat="server"
TargetControlID="numbersOnlyTextBox"
FilterType="Numbers" />