substring'ing a databound label to cap character limit? : The Official Microsoft ASP.NET Forums

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substring'ing a databound label to cap character limit?

Aug 07, 2007 07:56 PM|LINK

I have some code generated by VS2005 express, it works:

<asp:Label ID="bodyLabel" runat="server" Text='<%# Eval("news_body") %>'></asp:Label><br />

I wanted to chop the news_body data so that I could limit the maximum size of the text (with the intention to add a 'click for more' link where text IS too long)

I tried :

Eval(news_body).substring(1,150)

and also:

Eval(news_body).toString.substring(1,150)

But neither works. I'm struggling to grasp whats going on here.

Moved by limno on Aug 07, 2007 08:03 PM

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Re: substring'ing a databound label to cap character limit?

Aug 07, 2007 08:03 PM|LINK

Try Convert.ToString(Eval("news_body")).Substring(1,150)

Edited by Connect on Aug 07, 2007 08:05 PM

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limno

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Re: substring'ing a databound label to cap character limit?

Aug 07, 2007 08:04 PM|LINK

<asp:TemplateField HeaderText="news_body" SortExpression="news_body">

<asp:Label ID="Label1" runat="server" Text='<%# Eval("news_body").ToString().Substring(0,Math.Min(150,Eval("news_body").Length)) %>'></asp:Label>

</ItemTemplate>

</asp:TemplateField>

Limno

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Re: substring'ing a databound label to cap character limit?

Oct 15, 2007 08:25 AM|LINK

<asp:TemplateField HeaderText="news_body"  SortExpression="news_body">

<ItemTemplate>

<asp:Label ID="Label1" runat="server" Text='<%# Eval("news_body").ToString().Substring(0,Math.Min(150,Eval("news_body").Length)) %>'></asp:Label>

</ItemTemplate>

</asp:TemplateField>

I tried the above but i get the following error...:

Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0117: 'object' does not contain a definition for 'Length'

Source Error:

Line 13:      
Line 14: 
Line 15: news_body").ToString().Substring(0,Math.Min(150,Eval("news_body").Length)) %>'>
Line 16: 
Line 17:

Any Ideas..?

Thanks!

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Re: substring'ing a databound label to cap character limit?

Jun 08, 2008 03:05 PM|LINK

The message says it all. Object does not have any property called Length. Convert it to a string first :

Min(150,Eval("news_body").ToString().Length)

vonbondies
ompilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0117: 'object' does not contain a definition for 'Length'

Source Error:

Line 13: Line 14: Line 15: news_body").ToString().Substring(0,Math.Min(150,Eval("news_body").Length)) %>'> Line 16: Line 17:

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Re: substring'ing a databound label to cap character limit?

Jun 10, 2008 07:02 AM|LINK

got an error

Input string was not in a correct format.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.FormatException: Input string was not in a correct format.

Source Error:

Line 26:           </tr>
Line 27: 		 <tr>
Line 28: 		    <td  align="left" valign="top" class="fortune_text"><asp:Literal ID="ltr" Text ='<%# DataBinder.Eval(Container.DataItem, "firstname") + " " + DataBinder.Eval(Container.DataItem, "lastname").ToString().Substring(0,Math.Min(20,DataBinder.Eval(Container.DataItem, "firstname") + " " + DataBinder.Eval(Container.DataItem, "lastname").ToString().Length)) %>' runat="server"></asp:Literal>
Line 29: <br /><%#Eval("country")%>
Line 30:                 </td><td> </td>

Source File: E:\globalteleportal\portallibrary\portalsite\controls\newuserctrl.ascx Line: 28

Stack Trace:

[FormatException: Input string was not in a correct format.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat) +216
   Microsoft.VisualBasic.CompilerServices.Conversions.ToDouble(String Value, NumberFormatInfo NumberFormat) +83

[InvalidCastException: Conversion from string "alok " to type 'Double' is not valid.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ToDouble(String Value, NumberFormatInfo NumberFormat) +234
   Microsoft.VisualBasic.CompilerServices.Operators.AddObject(Object Left, Object Right) +2824
   ASP.controls_newuserctrl_ascx.__DataBinding__control6(Object sender, EventArgs e) in E:\globalteleportal\portallibrary\portalsite\controls\newuserctrl.ascx:28
   System.Web.UI.Control.OnDataBinding(EventArgs e) +80
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +198
   System.Web.UI.Control.DataBind() +12
   System.Web.UI.Control.DataBindChildren() +214
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +208
   System.Web.UI.Control.DataBind() +12
   System.Web.UI.WebControls.DataList.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem) +130
   System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource) +620
   System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) +57
   System.Web.UI.WebControls.BaseDataList.DataBind() +62
   controls_newuserctrl.bindlst() in E:\globalteleportal\portallibrary\portalsite\controls\newuserctrl.ascx.vb:18
   controls_newuserctrl.binddata() in E:\globalteleportal\portallibrary\portalsite\controls\newuserctrl.ascx.vb:14
   controls_newuserctrl.Page_Load(Object sender, EventArgs e) in E:\globalteleportal\portallibrary\portalsite\controls\newuserctrl.ascx.vb:7
   System.Web.UI.Control.OnLoad(EventArgs e) +80
   System.Web.UI.Control.LoadRecursive() +49
   System.Web.UI.Control.LoadRecursive() +132
   System.Web.UI.Control.LoadRecursive() +132
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3748

Regards
Parul Jain

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mimbert

Member

4 Points

2 Posts

Re: substring'ing a databound label to cap character limit?

Jun 10, 2008 12:19 PM|LINK

Math.Min(20,DataBinder.Eval(Container.DataItem, "firstname") + " " + DataBinder.Eval(Container.DataItem, "lastname").ToString().Length)
 
I believe the Length properties here applies only to  the second DataBinder.Eval. In that case you are trying to add a string to an integer.
You would have to do Math.Min(20,DataBinder.Eval(Container.DataItem, "firstname") .ToString().Length + DataBinder.Eval(Container.DataItem, "lastname").ToString().Length)

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srinivas.jak...

Member

39 Points

4 Posts

Re: substring'ing a databound label to cap character limit?

Jan 30, 2009 06:43 PM|LINK

<asp:TemplateField HeaderText="news_body" SortExpression="news_body">

<asp:Label ID="Label1" runat="server" Text='<%# Truncate(Eval("news_body").ToString(),150) %>'></asp:Label>

</ItemTemplate>

</asp:TemplateField>

Code Behind :

string Truncate(string input, int characterLimit) {
  string output = input;

  // Check if the string is longer than the allowed amount
  // otherwise do nothing
  if (output.Length > characterLimit && characterLimit > 0) {

    // cut the string down to the maximum number of characters
    output = output.Substring(0,characterLimit);

    // Check if the character right after the truncate point was a space
    // if not, we are in the middle of a word and need to remove the rest of it
    if (input.Substring(output.Length,1) != " ") {
      int LastSpace = output.LastIndexOf(" ");

      // if we found a space then, cut back to that space
      if (LastSpace != -1) {
        output = output.Substring(0,LastSpace);  
      }
    }
    // Finally, add the "..."
    output += "...";    
  }
  return output;
}

for More Information gothrow following link

Control the Length

srinivas

Edited by srinivas.jakku on Jan 30, 2009 06:48 PM

substring'ing a databound label to cap character limit? RSS

7 replies

biggerbyfar

substring'ing a databound label to cap character limit?

Connect

Re: substring'ing a databound label to cap character limit?

limno

Re: substring'ing a databound label to cap character limit?

vonbondies

Re: substring'ing a databound label to cap character limit?

mimbert

Re: substring'ing a databound label to cap character limit?

vonbondies

parulitengg

Re: substring'ing a databound label to cap character limit?

Input string was not in a correct format.

mimbert

Re: substring'ing a databound label to cap character limit?

srinivas.jak...

Re: substring'ing a databound label to cap character limit?

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