asked on

asp.net client side validation by calling page method

Dear asp.net gurus:

I have a asp.net web page where I need user enter product serial number, and I need to validate the user's entry; if the serial number already exists in SQL server database, then asp.net validator will display error message like 'serial number has been used'. I do not want to do this check on the clientvalidation. I knew that can be done by creating a javascript calling a asp.net static page method and then return the isvalid value to validator. The isvalid value is exchange by using JSON serialization?

I just wonder if anybody can give me some example and source code to show me how to implement the way I want it to be.

Please do not just copy and paste some links to me, please give me some explananation and then I can know how to integrate with my project.

Thanks in advance.

Shawn

saritapatel

textbox validation at serverside
------------------------------------------------------------

using System.Text.RegularExpressions;

#region securitycodebysarita
int Invalidtext;
Regex rx = new Regex("[^a-zA-Z0-9:$@.!_/\\~,#&*()=+{}<>?| \\s]");

private void Txt_Validation(Control ControlContainer)
{
try
{
foreach (Control Ctl in ControlContainer.Controls)
{
if ((Ctl.Controls != null))
{
Txt_Validation(Ctl);
if (Ctl is System.Web.UI.WebControls.TextBox)
{
try
{
TextBox tx = new TextBox();
tx = (TextBox)Ctl;

if ((rx.IsMatch(tx.Text)))
{
Invalidtext = Invalidtext + 1;

string StrScript = "";
StrScript = "<script type='text/javascript'>alert('Invalid Input Character!'); </script>";
System.Web.UI.ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), "", StrScript, false);

return;
}
}
catch (Exception ex)
{

}
}
}
}
}
catch (Exception ex)
{
throw ex;
}
}

#endregion
******************put this code before any save or update.this will validate all your textbox ******************

Invalidtext = 0;
Txt_Validation(this);
if (Invalidtext > 0)
{
Invalidtext = 0;
return;
}

Note : Change new Regex("[^a-zA-Z0-9:$@.!_/\\~,#&*()=+{}<>?| \\s]"); as per your requirement.

OHHIITSSEAN

ASKER

Hello saritapate:

Thanks for your prompt response.

Like I said, I need to check if the serial number exists in the serial number registration table of SQL server, your workaround is not the implementation I want. I need a something like asp:customvalidator onclientvalidation calling a javascript whose function can call asp.net static page method, the page method can communication with SQL server, checking if the record already exists or not, then sending the ture/false value to javascript and then javascript can determine if isvalid is true or false and notify customvalidator.

Thanks for your time and support.

Sean

OHHIITSSEAN

ASKER

Hello ASP.Net gurus:

Anyone have ideas?

ASKER CERTIFIED SOLUTION

Member_2_4913559

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

SOLUTION

OHHIITSSEAN

membership