Javascript verify integer or float value from textbox

  
    

   
     
   
     // vaild inter number function
 1 
   
     function
   
      isInteger(obj, Name)

   
      2 
   
      {

   
      3 
   
      
   
     if
   
     ( obj.value 
   
     ==
   
      
   
     ""
   
      )

   
      4 
   
      
   
     return
   
      
   
     true
   
     ;

   
      5 
   
      

   
      6 
   
      
   
     var
   
      regu 
   
     =
   
      
   
     /
   
     ^[-]{0,1}[0-9]{1,}$
   
     /
   
     ;

   
      7 
   
      
   
     if
   
     ( isNaN(obj.value) 
   
     ||
   
      
   
     !
   
     regu.test(obj.value))

   
      8 
   
      {

   
      9 
   
      alert(Name 
   
     +
   
      
   
     '
   
      must be integral number!
   
     '
   
     );

   
     10 
   
      obj.focus();

   
     11 
   
      
   
     return
   
      
   
     false
   
     ;

   
     12 
   
      }

   
     13 
   
      

   
     14 
   
      
   
     return
   
      
   
     true
   
     ;

   
     15 
   
      }
  
    

  
    

   
     
   
      1 
   
     //
   
      verify float number from textbox
   
     

   
      2 
   
      
   
     function
   
      ChangeQTY(obj, Name)

   
      3 
   
      { 

   
      4 
   
      

   
      5 
   
      
   
     if
   
      (obj.value 
   
     !=
   
      
   
     ""
   
      
   
     &&
   
      isNaN(obj.value))

   
      6 
   
      {

   
      7 
   
      alert(Name 
   
     +
   
      
   
     '
   
      must be number!
   
     '
   
     );

   
      8 
   
      obj.focus();

   
      9 
   
      
   
     return
   
      
   
     false
   
     ;

   
     10 
   
      }

   
     11 
   
      }