I have a page with several dropdownlists, several text boxes and
several buttons which perform calculations. I need to validate one
dropdownlist (not the whole page) with the click of one button. I have
a separate submit button which should validate the other fields.
This page on MSDN does what I want - almost!
http://msdn.microsoft.com/library/de...ationTopic.asp
I added a dropdownlist, customvalidator and another asp:button, but the
validation control does not work when I click on the button. (it works
when I change the value in the dropdown)
Can anyone help please?
Many thanks.
----------------------WEB FORM-----------------------------
<html>
<head>
<script LANGUAGE="javascript">
function isItemSelected(source, arguments){
alert(source,arguments)
if (arguments.Value < 1)
{
arguments.IsValid = false;
}
else
{
arguments.IsValid = true;
}
}
-->
</script>
</head>
<body>
<form RUNAT="server" ID="Form1">
<h3> Button CausesValidation Example </h3>
<table BORDER="1" CELLPADDING="10">
<tr>
<td>
<b>Enter city to query.</b> <br>
<asp:textbox ID="CityTextBox"
RUNAT="server"/>
<asp:requiredfieldvalidator ID="CityReqValidator"
CONTROLTOVALIDATE="CityTextBox"
ERRORMESSAGE="<br>Please enter a city."
DISPLAY="Dynamic"
ENABLECLIENTSCRIPT="False"
RUNAT="server"/>
</td>
<td VALIGN="bottom">
<asp:button ID="CityQueryButton"
TEXT="Submit"
CAUSESVALIDATION="False"
ONCLICK="SubmitButton_Click"
RUNAT="server"/>
</td>
</tr>
<tr>
<td>
<b>Enter state to query.</b> <br>
<asp:textbox ID="StateTextBox"
RUNAT="server"/>
<asp:requiredfieldvalidator ID="StateReqValidator"
CONTROLTOVALIDATE="StateTextBox"
ERRORMESSAGE="<br>Please enter a state."
DISPLAY="Dynamic"
ENABLECLIENTSCRIPT="False"
RUNAT="server"/>
</td>
<td VALIGN="bottom">
<asp:button ID="StateQueryButton"
TEXT="Submit"
CAUSESVALIDATION="False"
ONCLICK="SubmitButton_Click"
RUNAT="server"/>
</td>
</tr>
<tr>
<td><asp:DropDownList id="DropDownList1" runat="server">
<asp:listitem VALUE ="0">Select</asp:listitem>
<asp:listitem VALUE ="1">UK</asp:listitem>
<asp:listitem VALUE ="2">USA</asp:listitem></asp:DropDownList>
<asp:CustomValidator id="CustomValidator1"
runat="server"
ErrorMessage="*"
controltovalidate="DropDownList1"
DISPLAY="Dynamic"
clientvalidationfunction="isItemSelected">
</asp:CustomValidator>
</td>
<td valign="bottom">
<asp:Button id="DropDownButton"
runat="server"
Text="Button"
ONCLICK="DropDownButton_Click"
CAUSESVALIDATION="False"></asp:Button>
</td></tr>
</table>
<br><br>
<asp:label ID="Message"
RUNAT="Server"/>
</form>
</body>
</html>
----------------------CODE BEHIND------------------------------
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
'Put user code to initialize the page here
End Sub
Sub SubmitButton_Click(ByVal sender As Object, ByVal e As
EventArgs)
' Determine which button was clicked.
Select Case (CType(sender, Button)).ID
Case "CityQueryButton"
' Validate only the controls used for the city query.
CityReqValidator.Validate()
' Take the appropriate action if the controls pass
validation.
If CityReqValidator.IsValid Then
Message.Text = "You have chosen to run a query for
the following city: " & _
CityTextBox.Text
End If
Case "StateQueryButton"
' Validate only the controls used for the state query.
StateReqValidator.Validate()
' Take the appropriate action if the controls pass
validation.
If StateReqValidator.IsValid Then
Message.Text = "You have chosen to run a query for
the following state: " & _
StateTextBox.Text
End If
Case "DropDownButton"
CustomValidator1.Validate()
' Take the appropriate action if the controls pass
validation.
If CustomValidator1.IsValid Then
Message.Text = "IsValid"
Else
Message.Text = "InValid"
End If
Case Else
' If the button clicked isn't recognized, erase the
message on the page.
Message.Text = ""
End Select
End Sub
