Elangovan: Number validation using javascript

 <html>  
 <head>  
 <script>  
 function floatValidation(e,control)  
 {  
   if (e.keyCode==46)  
   {     
     var patt1=new RegExp("\\.");  
     var ch =patt1.exec(control.value);  
     if(ch==".")  
     {  
       e.keyCode=0;  
     }  
   }  
   else if( (e.keyCode>=48 && e.keyCode<=57) || e.keyCode==8)//Numbers or BackSpace  
   {     
     if (control.value.indexOf('.') != -1)//. Exist in TextBox  
     {  
       var pointIndex=control.value.indexOf('.');  
       var beforePoint = control.value.substring(0,pointIndex);  
       var afterPoint = control.value.substring(pointIndex+1);  
       var iCaretPos = 0;  
       if (document.selection)  
       {  
         if (control.type == 'text') // textbox  
         {  
           var selectionRange = document.selection.createRange();  
           selectionRange.moveStart ('character', -control.value.length);  
           iCaretPos = selectionRange.text.length;  
         }  
       }  
       if(iCaretPos > pointIndex && afterPoint.length >= 2)  
       {  
         e.keyCode=0;  
        alert('You enter two digit only after decimal point');  
       }  
       else if(iCaretPos <= pointIndex && beforePoint.length >= 7)  
       {  
         e.keyCode=0;  
       }  
     }  
     else//. Not Exisist in TextBox  
     {  
       if(control.value.length >= 7)  
       {  
         e.keyCode=0;  
         alert('You enter 7 digit only before decimal point');  
       }  
     }  
   }  
   else  
   {  
     e.keyCode=0;  
   }  
 }  
 </script>  
 </head>  
 <body>  
      <input id="amt" type="text" name="Amount" onkeypress="return floatValidation(event,this)" onfocus="setCaretPosition(this,0);"/>  
 </body>  
 </html>
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Number validation using javascript

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