Error Handling in Wizard HTML Files

When you create a wizard with a user interface, your project includes .htm files. Use these files to customize your project. See The HTML Files for more information.

Your project should include error handling. The following code provides you with an example of such code.

To handle errors in HTML

1. When you validate the fields, if you call a validation method in a DLL (which should set the error information), call ReportError with no parameters.

   function ValidateInput()
   {
      if (!window.external.ValidateFile(HEADER_FILE.value))
      {
         ReportError();
         HEADER_FILE.focus();
         return false;
      }
   }
   

2. When you validate fields, if you validate the field using only the HTML script, call SetErrorInfo first and then call ReportError with no parameters.

   function OnWhatever()
   {
      if (!ValidateInput())
         window.external.ReportErrror();
      ....
   }
   
   function ValidateInput()
   {
      .....
   
      if (HEADER_FILE.value == IMPL_FILE.value)
      {
         var L_ErrMsg_Text = "Header and implementation files cannot have the same name.";
         SetErrorInfo(L_ErrMsg_Text);
         bValid = false;
      }
      if (TYPE.value == "")
      {
         var L_ErrMsg4_Text = "Type cannot be blank.";
         SetErrorInfo(L_ErrMsg4_Text);
         bValid = false;
      }
      return bValid;
   }
   

3. Call ReportError with parameters:

   function ValidateInput()
   {
      if (!IsListed(strType))
      {
         var L_Invalid2_Text = "The variable type should be one of the types listed.";
         window.external.ReportError(L_Invalid2_Text);
         VariableType.focus();
         return false;
      }
   }
   

4. If you must go back to the New Project or Add New Item dialog box, return VS_E_WIZBACKBUTTONPRESS:

   try
   {
      oCM   = window.external.ProjectObject.CodeModel;
   }
   catch(e)
   {
      var L_NCBError_Text = "Cannot access the Class View information 
   (.ncb) file. Class View information will not be available.";
      window.external.ReportError(L_NCBError_Text);
      return VS_E_WIZARDBACKBUTTONPRESS;
   

See Also

Concepts

Files Created for Your Wizard

Customizing Your Wizard