Error handling in vbscript, Visual Basic Programming

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While a run-time error takes place, the properties of the Err object are filled with information which uniquely identifies the error & information which can be used to handle it. In order to generate a run-time error in your code, employ the VBScript Err Object Raise Method. The Err object's properties are reset at zero or zero-length strings ("") after an On Error Resume Next statement. The VBScript Err Object Clear technique can be utilized to explicitly reset Err object. The Err object is an intrinsic object along global scope - there is no requirement to generate an instance of it in your code.

Assume the following example that displays some of the possible errors which can be raised explicitly to generate run time errors.

<HTML>

<HEAD>

<TITLE>IGNOU</TITLE>

<SCRIPT LANGUAGE="VBScript">

<!--

Sub cmdSubmit_OnClick

On Error resume Next

'Check to make out if the user entered anything.

If (Len(document.form1.txtAge.value)  = 0)

Then MsgBox "before submitting you have to enter your age." Exit Sub

End If

'Check to make out if the user entered a number.

If (Not(IsNumeric(document.form1.txtAge.value ))) Then

MsgBox "You have to enter number for enter your age." Exit Sub

End If

'Check to make out if the age entered is valid.

If (document.form1.txtAge.value  <= 0) Or  (document.form1.txtAge.value  > 100)

Then

MsgBox "The age you entered is not applicable." Exit Sub

End If

' Data looks okay so submit it.

MsgBox "Thanks for entering age." document.form1.submit

End Sub

Sub cmdtype_OnClick

On Error Resume Next for i = 1 to 35

Err.clear

Err.Raise i

MsgBox Err.description & " - Error number - " &i

Next

End Sub

-->

</SCRIPT>

</HEAD>

<BODY  bgColor="#ffffcc" Text="#000099" >

<H1>Error Handling and validations</H1>

<B><P> This instance demonstrates validation techniques and Error handling in

VBScript. </P><?B>

<B>Please enter the age among 1 and 100. Or else, an error message would be flashed on clicking the submit button.</B>

<FORM NAME="form1">

<TABLE>

<TR>

<TD>Enter your age :</TD>

<TD><INPUT TYPE="Text" NAME="txtAge" SIZE="2"></TD>

</TR>

<TR>

<TD><INPUT TYPE="Button" NAME="cmdSubmit" VALUE="Submit"></TD>

<TD></TD>

<TD><INPUT TYPE="Button" NAME="cmdtype" VALUE="      Type Of Errors "></TD>

<TD></TD>

</TR>

</TABLE>

</FORM>

</BODY>

</HTML>

2485_Error Handling in VBScript.png

Figure: Error Handling in VBScript


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