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How to display an error when textbox web control has lost focus?

Posted on 2010-11-25
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Last Modified: 2012-05-10
I have a textbox & button on my web page. When the page is loaded, the textbox gets the focus. When I click the button and nothing is entered in the textbox, an error message is raised. I want to do the same when the textbox loses focus. How can it be done so that when the textbox loses focus, the error message is raised?

The error is raised using a requiredfield validator and the language used is C#.
*.aspx
------
<asp:TextBox ID="txtNo" runat="server" Columns="32" MaxLength="20"></asp:TextBox>

<asp:RequiredFieldValidator ID="reqFieldNo" ControlToValidate="txtNo" 
    Display="Static" runat="server" SetFocusOnError="True" 
    ErrorMessage="Assign a number to the project."><img src="images/png/error5.png" alt="Assign a number to the project" width="20" height="20" /></asp:RequiredFieldValidator>

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Question by:maartendierckxsens
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7 Comments
 
LVL 29

Expert Comment

by:Kumaraswamy R
ID: 34211439
set the                 TabIndex =0
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Accepted Solution

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Carl Tawn earned 50 total points
ID: 34211452
You should be able to force the validation by adding the following attribute to the textbox:

onblur="ValidatorOnChange(event);"
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Author Comment

by:maartendierckxsens
ID: 34212171
Is it possible to provide me with some examples?
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LVL 52

Assisted Solution

by:Carl Tawn
Carl Tawn earned 50 total points
ID: 34212182
<asp:TextBox ID="txtNo" runat="server" Columns="32" MaxLength="20" onblur="ValidatorOnChange(event);"  />

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Author Comment

by:maartendierckxsens
ID: 34212272
Can i use the protected void txtNo_LostFocus(object sender, EventArgs e)?
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LVL 52

Expert Comment

by:Carl Tawn
ID: 34212283
You could, but that would require an unecessary postback to the server.
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Author Comment

by:maartendierckxsens
ID: 34212571
ok, i used the onblur event and it worked great.


thanks a lot
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