RequiredField Validation controls then execute TextChanged

Murali Kris

Hi Folks,

I have a webForm.aspx, it have textboxes, textbox is assosiated with fieldRequired validate control(RegularExpressionValidator,ReqiredFiledValidator) for general validations.

but here i also required TextBox_TextChanged event for other validation so issue

textbox_TextChanged event is executing before fieldRequiredvalidate controls(RegularExpressionValidator,ReqiredFiledValidator)

how to validate first fieldRequiredvalidate controls if everything fine then allow to execute textBox_Textchanged even.

i just googled and find blow link

https://forums.asp.net/t/1178403.aspx?How+to+stop+Textchanged+event+when+validator+is+fired+

my code.cs

protected void TextBox1_TextChanged(object sender, EventArgs e)

{

if(!System.Text.RegularExpressions.Regex.IsMatch(TextBox1.Text,RegularExpressionValidator1))

{

Label2.Text = "from textChanged.";

}

error is: Can`t convert argument2 etc...

Note: TextBox is validating with two Required control(regularExpression,fieldRequired)

=> IsMatch(TextBox1.Text,Regular_Expression))

how to pass Regular_Expression..? or use regular_expression with RequiredFields Controls

please check above link for more details

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Priyanka Jain7y ago
Accepted answer
You can try below code for matching RegEx

For example,
var emailRegex = @"^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$";
now while checking you can try
// using below namespace
using System.Text.RegularExpressions;


Regex.IsMatch(Textbox1.Text, emailRegex);
So your textchanged event will go like,
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
if(!System.Text.RegularExpressions.Regex.IsMatch(TextBox1.Text,emailRegex))
{
Label2.Text = "from textChanged.";
}
}
Murali Kris7y ago
Issue is fixed with the Help of TextBox Property Set it to true.
It first validating OOB controls, if every thing is fine as per Validation controls then textBoxChanged event is firing.

Once again thank you.
Murali Kris7y ago
Hi Priyanka,

Seems like good but,
you know i used in form OOB(out of the box) control Validators(RequiredFiledvalidator,RegularExpression),
i would like to call these controls rather than variable(emailRegex) since alredy set with control property called ValidationExpression=@"^\w{3,255}$" also with @"^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$"
No error but now issue is that OOB regular expression is not working properly means just visibiling and hidding immediatly, which means still textBox_textChanged event is firring the movemt when cursor/Tab goes to next textbox.

what is issue..? how to stop/wait untill OOB control validation complets

Is there any possible ways other than this.

From .ASPX File
ControlToValidate="TextBox1"
ErrorMessage="Should not empty&Should not Speacial Characters."
ForeColor="Red"
ValidationExpression="^\w{3,255}$">

from .cs file
var emailRegex = @"^\w{3,255}$";//@"^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$";
if (Regex.IsMatch(TextBox1.Text, emailRegex))
{
Label2.Text = "from textChanged should not execute untill validation complets.";
}
kindly help me