Currently dealing with a brownfield site that triggers asp.net clientside validation, however, it consistently initiates a postback regardless of the outcome. Anyone have any suggestions on how to prevent this behavior in the event of failed validation?
Appreciate your insights.
Podge
If you want to implement client-side validation, one option is to use the Custom Validator control from w3schools or MSDN. You can see an example of how it's used below:
<asp:CustomValidator id="CustomValidator1" runat="server"
ErrorMessage="Number not divisible by 2!"
ControlToValidate="txtCustomData"
OnServerValidate="ServerValidate"
ClientValidationFunction="CheckEven" /><br>
Input:
<asp:TextBox id="txtCustomData" runat="server" />
<script language="javascript">
<!--
function CheckEven(source, args) {
var val = parseInt(args.Value, 10);
if (isNaN(val)) {
args.IsValid = false;
}
else {
args.IsValid = ((val % 2) == 0);
}
}
// -->
</script>
I encountered a similar issue but was able to resolve it by enabling the CausesValidation property.
Just as an illustration: ensure that the textbox is validated, if it's empty, the postback is not triggered, otherwise the postback is called.
Button click event:
<asp:TextBox id="vInput" runat="server" />
<asp:button id="submitButton" runat="server OnClick="submitButton_Click" OnClientClick=" return validateForm();"/>
<script type="text/javascript">
function validateForm() {
var inputText = $("#vInput").val();
if (inputText === "") {
alert("Error: Textbox is empty");
return false;
} else {
alert("No error - proceeding with postback");
return true;
} }
</script>
One situation I encountered involved several CustomValidators with a missing ClientValidationFunction.
To address this issue, it's important to check for any JavaScript errors that may be contributing to the problem.
When it comes to Client Validation, the key is to call a JavaScript function for validation:
If you want to trigger client-side validation on a button click, the correct way to do so is as follows:
<asp:Button runat="server" id ="btnSubmit" onClientClick="return ValidateForm();" >
The Validate Form method should return either true or false.
For example:
function ValidateForm()
{
/// Perform validation logic here
if (validated)
{
return true;
}
else{
return false;
}
}
}
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