Customize label text in grid view template field - asp.net

I want to show "N/A" text in grid view label if value is not available in database and if it is available, then the value should be displayed instead of "N/A".
How can I customize my label?
This is the code that I have written to get the value.
<asp:Label ID="lblCineRunFrom" runat="server" Text='<%# Eval("CineRunFrom") %>'></asp:Label>


This works:
<asp:Label id="dada" runat="server" Text='<%# string.Format("{0}",string.IsNullOrEmpty(Eval("CineRunFrom").ToString())?"N/A":Eval("CineRunFrom")) %>' ></asp:Label>


You may use this: Text='<%# Eval("CineRunFrom")?? "N/A" %>'


Add a new function in code behind & call it from HTML code, check sample code below.
Code
Private Function GetDisplayText(ByVal CineRunFrom As String) As String
'Do whatever you want here and return text to dispaly as required
End Function
HTML
<asp:Label ID="lblCineRunFrom" runat="server" Text='<%# GetDisplayText(Eval("CineRunFrom")) %>'></asp:Label>

Related

Use of Resources in Eval syntax

I'm wondering how I can use the Resources within the below Label - I'm not entirely sure.
The original line with a replacement "Yes" or "No":
<asp:Label runat="server" ID="someId" Text='<%# (Boolean.Parse(Eval("BooleanValue").ToString())) ? "Yes" : "No" %>'></asp:Label>
What I believed I could do with the resources:
<asp:Label runat="server" ID="someId" Text='<%# (Boolean.Parse(Eval("BooleanValue").ToString())) ? '<%$ Resources:language, Yes%>' : '<%$ Resources:language, No%>' %>'></asp:Label>
Any help would be appreciated, Thanks.

Okay, I got around this by declaring the variables in the code behind
protected string yes;
protected string no;
Then updating them once my page had loaded based on the culture the user set.
yes = language.ResourceManager.GetString("Yes",CultureInfo.CurrentCulture);
no = language.ResourceManager.GetString("No", CultureInfo.CurrentCulture);
Then using those in the statement
<asp:Label runat="server" ID="someId" Text='<%# (bool)Eval("BooleanValue") == false ? no.ToString() : yes.ToString() %>'></asp:Label>

Reduce or curtailment a displayed cells text in Gridview without wrapping text

I have executed a database query that returns a long field data, in my case I need to curtailment one of this fields as the sample below.
How can I display a shortcuted content with add dots like(...)

try below query
select (CASE WHEN LEN(Name)>20 THEN SUBSTRING(NAme,0,20) + '...' ELSE Name END) AS Name from Table1

Something like this?
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("URL").ToString().Length > 20? (Eval("URL") as string).Substring(0,10) + " ..." : Eval("URL") %>' ToolTip='<%# Eval("URL") %> '> </asp:Label>
</ItemTemplate>
Adjust the length as you wish.

How do I conditionally display text in an ASP TemplateView?

I have a few fields that look like this in a website that uses ASP and VB (the data is displayed in a gridview):
<asp:TemplateField HeaderText ="Comp" SortExpression="NAM_CMPT" ItemStyle-Width="50%" ItemStyle-Wrap ="false" ItemStyle-HorizontalAlign ="left">
<ItemTemplate>
<asp:Label ID ="Label_Comp" runat="server"
Text='<%# Eval("CDE_CMPT") + " - " + Eval("NAM_CMPT")%>' />
</ItemTemplate>
</asp:TemplateField>
And what I'm trying to do is display nothing in the field if the data is empty, and display the string you see in the Text property if there is data. Currently it displays the hyphen used in the Text string when there is no data. I tried several methods of formatting the Eval that I found online but was unable to find a working solution. I also tried using the
EmptyDataText
property however this seemed to have no effect.
I am new to ASP so that could be user error. Any help is greatly appreciated.

You can also use eval for visible and check for data
<asp:TemplateField HeaderText ="Comp" SortExpression="NAM_CMPT" ItemStyle-Width="50%" ItemStyle-Wrap ="false" ItemStyle-HorizontalAlign ="left">
<ItemTemplate>
<asp:Label ID ="Label_Comp" runat="server" visible='<%# If(String.IsNullOrEmpty(Eval("CDE_CMPT")), false, true)'
Text='<%# Eval("CDE_CMPT") + " - " + Eval("NAM_CMPT")%>' />
</ItemTemplate>
</asp:TemplateField>
I haven't used VB.net is a while, so the syntax might be off.

Conditional output in GridView row

I databing array of User objects to GridView control. Last column contains "action" anchors (edit, remove):
<asp:TemplateField HeaderText="Actions">
<ItemTemplate>
Remove
Edit
</ItemTemplate>
</asp:TemplateField>
However I would like not to output first anchor to Remove action if currently binded User object has the same id as use logged in (available with this.SessionUser.Id).Something like this:
<asp:TemplateField HeaderText="Actions">
<ItemTemplate>
Remove
if (this.SessionUser.Id <> Eval("user_id") { Edit }
</ItemTemplate>
</asp:TemplateField>
How can I do it?
Thanks!

You can use a runat="server" control for this
<asp:TemplateField HeaderText="Actions">
<ItemTemplate>
Remove
<a href="Edit.aspx?id=<%# Eval("user_id") %>" runat="server"
visible='<%# this.SessionUser.Id <> Eval("user_id") %>'>Edit</a>
</ItemTemplate>
</asp:TemplateField>
All server controls, even HTML tags with runat="server" have this Visible property, which omits the control from the final HTML when it is false.

not supported :( you need to write another function passing it user_id and get the appripriate string from it like this:
//in cs file
protected string GetLink(object o)
{
if(!SessionUser.Id.Equals(o)) //or anyother way to compare equality
return string.Format("<a href=\"Edit.aspx?id={0}\">",0);
return "";
}
//in aspx file
<ItemTemplate>
Remove
<%# GetLink(Eval("user_id"))%>
</ItemTemplate>

you can use CSS:
<a style='visible:<%# this.SessionUser.Id <> Eval("user_id") %>' > ... </a>
make sure that this.SessionUser.Id is a public variable in your .cs file

Formatting DataBinder.Eval data

How can I format data coming from a DataBinder.Eval statement in an ASPX page?
For example, I want to display the published date of the news items in a particular format in the homepage. I'm using the ASP.NET 2.0 Repeater control to show the list of news items.
The code for this goes like this:
<asp:Repeater ID="Repeater1" runat="server" DataSourceID="ObjectDataSource1">
<HeaderTemplate><table cellpadding="0" cellspacing="0" width="255"></HeaderTemplate>
<ItemTemplate>
<tr><td >
<a href='/content/latestNews.aspx?id=<%#DataBinder.Eval(Container.DataItem, "id") %>'>
<asp:Label ID="lblNewsTitle" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "title") %>'></asp:Label>
</a>
</td></tr>
<tr><td>
<asp:Label ID="lblNewsDate" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "publishedDate"))%>'></asp:Label>
</td></tr>
</ItemTemplate>
<FooterTemplate></table></FooterTemplate></asp:Repeater>
Is there a way I could call a custom method with the DataBinder.Eval value as its parameter (something like below)?
<asp:Label ID="lblNewsDate" runat="server" Text='<%# GetDateInHomepageFormat(DataBinder.Eval(Container.DataItem, "publishedDate")) )%>'></asp:Label>
If yes, then where do I write the GetDateInHomepageFormat method? I tried out in the code behind page but got a run time error?
If this is not possible, is there a way to do inline formatting?

There is an optional overload for DataBinder.Eval to supply formatting:
<%# DataBinder.Eval(Container.DataItem, "expression"[, "format"]) %>
The format parameter is a String value, using the value placeholder replacement syntax (called composite formatting) like this:
<asp:Label id="lblNewsDate" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "publishedDate", "{0:dddd d MMMM}") %>'</label>

After some searching on the Internet I found that it is in fact very much possible to call a custom method passing the DataBinder.Eval value.
The custom method can be written in the code behind file, but has to be declared public or protected. In my question above, I had mentioned that I tried to write the custom method in the code behind but was getting a run time error. The reason for this was that I had declared the method to be private.
So, in summary the following is a good way to use DataBinder.Eval value to get your desired output:
default.aspx
<asp:Label ID="lblNewsDate" runat="server" Text='<%# GetDateInHomepageFormat(DataBinder.Eval(Container.DataItem, "publishedDate")) )%>'></asp:Label>
default.aspx.cs code:
public partial class _Default : System.Web.UI.Page
{
protected string GetDateInHomepageFormat(DateTime d)
{
string retValue = "";
// Do all processing required and return value
return retValue;
}
}
Hope this helps others as well.

Why not use the simpler syntax?
<asp:Label id="lblNewsDate" runat="server" Text='<%# Eval("publishedDate", "{0:dddd d MMMM}") %>'</label>
This is the template control "Eval" that takes in the expression and the string format:
protected internal string Eval(
string expression,
string format
)
http://msdn.microsoft.com/en-us/library/3d2sz789.aspx

You can use a function into a repeater like you said, but notice that the DataBinder.Eval returns an object and you have to cast it to a DateTime.
You also can format your field inline:
<%# ((DateTime)DataBinder.Eval(Container.DataItem,"publishedDate")).ToString("yyyy-MMM-dd") %>
If you use ASP.NET 2.0 or newer you can write this as below:
<%# ((DateTime)Eval("publishedDate")).ToString("yyyy-MMM-dd") %>
Another option is to bind the value to label at OnItemDataBound event.

This line solved my problem:
<%#DateTime.Parse(Eval("DDDate").ToString()).ToString("dd-MM-yyyy")%>

To format the date using the local date format use:
<%#((DateTime)Eval("ExpDate")).ToString("d")%>
How to Format an Eval Statement to Display a Date using Date Locale

Thanks to all. I had been stuck on standard format strings for some time. I also used a custom function in VB.
Mark Up:-
<asp:Label ID="Label3" runat="server" text='<%# Formatlabel(DataBinder.Eval(Container.DataItem, "psWages1D")) %>'/>
Code behind:-
Public Function fLabel(ByVal tval) As String
fLabel = tval.ToString("#,##0.00%;(#,##0.00%);Zero")
End Function

Text='<%# DateTime.Parse(Eval("LastLoginDate").ToString()).ToString("MM/dd/yyyy hh:mm tt") %>'
This works for the format as you want

<asp:Label ID="ServiceBeginDate" runat="server" Text='<%# (DataBinder.Eval(Container.DataItem, "ServiceBeginDate", "{0:yyyy}") == "0001") ? "" : DataBinder.Eval(Container.DataItem, "ServiceBeginDate", "{0:MM/dd/yyyy}") %>'>
</asp:Label>

You can use it this way in aspx page
<%# DataBinder.Eval(Container.DataItem, "DateColoumnName", "{0:dd-MMM-yyyy}") %>

Resources