Alert Box

[Balwan]

I have to check a textbox text and if it is null while clicking the button then i have to show a message on alert box.:confused: Balwan Singh

[kirthikirthi]

Write a javascript function And call the function on button click function script() Dim s As String "alert('')" RegisterStartupScript("", s) end function If textbox = "" then Do stuff else script() endif asdfasdfasdfasdfasdfasdfasdfasdfasdfasdf -- modified at 5:32 Monday 1st May, 2006

[R Prabha Devi]

Hi, On click of the button call a javascript method in code behind, Below is .aspx.cs page code: For eg : Let server control button id be 'btnSave'

btnSave.Attributes.Add("OnClick","javascript:return ValidateTextBox();");

.aspx page code :

function ValidateTextBox()
{
//for eg:let the textbox id be 'txtName'

 //First check whether the textbox exists 
 if(document.getElementById("txtName")!=null)
  {
    if(isEmptyCheck("txtName")==true)
{
	alert("Text box value is empty,please enter value");
	return false;
}
  }

}

//function to check whether text box value is empty or not

function isEmptyCheck(X)
{
if((document.forms[0].elements[X].value=="") || (document.forms[0].elements[X].value.substring(0,1) == ' '))
{
return true;
}
return false;
}//end of function

Hope this helps you...:)

[CWIZO]

Use the RequierdFieldValidator control ;) -------------------------------------------------------- My portfolio & development blog Q:What does the derived class in C# tell to it's parent? A:All your base are belong to us!