Web Forms :: Control Non-empty Value Validation?
Jul 19, 2010
I have textbox A, B, C and D. Textbox A is optional, yet B, C and D are not required unless A contains an entry (then they are mandatory). What validation control do I associate with B, C and D that checks for an entry (anything other than being empty) in A? I don't see CompareValidator being able to do this so I was going to use a CustomValidator to perform server side validation (and possibly look into Javascript for server side).
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Jan 19, 2011
I need to perform a validation to check whether a TextBox value is empty on Dropown list selected Index change using validation controls in asp.net
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Jan 13, 2011
I want the validation condition to be: on a pair of textboxes, to be valid as long as at least one of them isn't empty.
So I put a customvalidator on the 2nd textbox, hooked up to the following server code and client code:
<script type="text/javascript">
function ECPhoneOrEmailRequired(source, args) {
var ecPhone = document.getElementById("txtEmergencyPhone");
var ecEmail = document.getElementById("txtEmergencyEmail");
if (ecPhone.value.length < 1 && ecEmail.value.length < 1) {
args.IsValid = false;
}
else {
args.IsValid = true
}
}
</script>
Protected Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)
'args.IsValid
If (txtEmergencyPhone.Text = String.Empty And txtEmergencyEmail.Text = String.Empty) Then
args.IsValid = False
Else
args.IsValid = True
End If
End Sub
From what I can tell thru breakpoints, this code works fine as long as there's something in one of the two textboxes. When both textboxes are empty, the code is never called - and so both boxes empty ends up being allowed.
So what's the correct way to validate one-or-the-other-nonempty condition?
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Jan 6, 2010
i am using a search box for my application which returns a dataset. however when i click on the search button it returns an empty table result. how could i add validation so it doesnt accept empty strings or numbers.
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Aug 18, 2010
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If textbox is empty on clciking it fire validation as well as itz going to D.aspx.. still textbox is empty why it fairing and redirect to D.aspx still textbox empty...
ScriptManager.RegisterStartupScript(this, typeof(string), "OPEN_WINDOW", "window.open('D.aspx?Parameter=" + TextBox1.Text + "', null );", true);
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Mar 19, 2010
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If mQuestion.RequiredToAnswer = True Then
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mValidator.Display = ValidatorDisplay.Dynamic
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mTableCell.Controls.Add(mValidator)
End If
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Nov 1, 2010
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Is there any difference in using the following for checking for an empty control.
If txtBox1.text.tostring isnot string.empty then
vs.
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vs.
If txtBox1.tetxt.tostring <> "" then
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Mar 12, 2010
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Value cannot be null or empty.
Parameter name: elementID
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[code]....
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Mar 10, 2010
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ie.
Template A
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Aug 29, 2010
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protected void Page_Load(object sender, EventArgs e)
{
foreach (int assetclassVal in Enum.GetValues(typeof(AssetClass)))
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[Code]....
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Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim dv As DataList
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[code]...
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