Javascript validations for a textbox


Description:

The below code can be used to validate a textbox in different ways 

using javascript.




Java script

< script language="javascript" type="text/javascript" >
    
  function AllowAlphabetsAndSpaces()
  {
     var keyCode = event.keyCode;

     if((keyCode>=65 && keyCode<=90) || (keyCode>=97 && keyCode<=122) || (keyCode==32))
     {
	event.returnValue = true;
     }
     else
     {
	event.returnValue = false;
     }   
  } 

  function AllowOnlyIntegers()
  {
     var keyCode = event.keyCode;
    
     if(keyCode>=48 && keyCode<=57)
     {			
	event.returnValue = true;
     }
     else
     {
	event.returnValue = false;
     }   
  }

  function AllowAlphanumeric()
  {
     if((keyCode>=65 && keyCode<=90) || (keyCode>=97 && keyCode <=122) || (keyCode>=48 && keyCode<=57) || (keyCode==32))
     {
	event.returnValue = true;
     }
     else
     {
	event.returnValue = false;
     }    
  }
  
  funtion Disable()
  {
    // to disable all keyboard entries
    event.returnValue = false;
  }

  function DisableKeys(keyType)
  {
    var keyCode = event.keyCode;
    //All keyboard entries disallowed except 35 - (End key) 36 - (Home) 37 - (Left Arrow) 39 - (Right Arrow)
    
	 if((keyCode==35) || (keyCode==36) || (keyCode==37)|| (keyCode==39))
	 {
	    event.returnValue = true;
	 }
	 else
	 {
	   event.returnValue = false;
	 }		
			
  }
< /script >


Code Behind:

            

//retrieving connectionstring from web.config.
  
protected void Page_Load(object sender, EventArgs e)
{       
    
    //Allows only alphabets and spaces...
         
    txtTextBox.Attributes.Add("onkeypress", "return AllowAlphabetsAndSpaces();");
    
    //Allows only Integers...
         
    txtTextBox.Attributes.Add("onkeypress", "return  AllowOnlyIntegers();");
    
    //Allows only Alphanumeric values...
         
    txtTextBox.Attributes.Add("onkeypress", "return   AllowAlphanumeric();");
}