Online Form Validation in Flash

Notice the following sample swf , There is an some limitation for all text boxes. if it exceeds it will show alert box. This sample validating string length and text format

1. Create new Flash File (File->New or Ctrl + N) and Name it as 'formvalidation'.
2. Create form with input fileds .and give Instance name for all text boxes 
3. Decide the limits for each text box ( for example in this sample first text box will only accept 8 characters) 
4. Now use the following code
   
   
   
   var strlen:String = txt_name.text;
   if (strlen.length>8) {
   mx.controls.Alert.show("This field only accepts Maximum 8 characters only");
   txt_name.text = strlen.substr(0, 8);
   }
   
   };
   //for validating string length
   txt_email.onChanged = function(textfield_txt:TextField) {
   
   var strlen:String = txt_email.text;
   if (strlen.length>15) {
   mx.controls.Alert.show("This field only accepts Maximum 15 characters only");
   txt_email.text = strlen.substr(0, 15);
   }
   
   };
   //for validating character type
   txt_phone.onChanged = function(textfield_txt:TextField) {
   
   if (int(txt_phone.text) == 0) {
   mx.controls.Alert.show("This field only accepts Numbers only");
   txt_phone.text = "";
   }
   
   };
5. Now give ctrl+Enter to run the player.

Download Source Code From here