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textfield color change


slowlearner

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I am new to javascript and web development in general and got a couple of questions.

 

1. Would this be a sane way to achieve the objective?

2. How would I get more elements into the function like lastname?

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<script type="text/javascript">
function see_red()
	{

	var input = document.getElementById('firstname');

   		if (input.value.length < 2)
		{
			input.style.border='2px solid red';
			return false;
		}
		else 
		{
			input.style.border='2px solid green';
			return true;
		}
	}

function see_green()
	{

	var input = document.getElementById('firstname');

   			if (input.value.length < 2)
			{
				input.style.border='2px solid red';
				return false;
			}
			else 
			{
				input.style.border='2px solid green';
				return true;
			}
	}
</script>
<body>

<form id="form1" name="form1" method="post" action="">
   		<p><input type="text" name="firstname" id="firstname" onclick="see_red()" onchange="see_green()" /></p>
		<p><input type="text" name="lastname" id="lastname" /></p>
	<p><input type="text" name="email" id="email" /></p>
    	<p><textarea name="msg" cols="30" rows="5" id="msg"></textarea></p>
		<p><input type="submit" name="submit" id="button" value="Submit" /></p>
</form>

</body>
</html>

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Thanks for the help but I can't quit seem to figure it.

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<script type="text/javascript">
function cChange(elm)
      {
      var some = (elm.name);
   	/*alert(some);*/
         if (some.value.length == "") 
         	{
            	some.style.border='2px solid red';
            	return false;
         }else {
            some.style.border='2px solid green';
            return true;
         }
      }	
</script>
<body>

   <form id="form1" name="form1" method="post" action="">
         <p><input type="text" name="firstname" id="first" onclick="cChange(this)" onkeyup="cChange(this)" /></p>
       <p><input type="text" name="lastname" id="last" onclick="cChange(this)" onkeyup="cChange(this)" /></p>
      <p><input type="text" name="email" id="email" /></p>
       <p><textarea name="msg" cols="30" rows="5" id="msg"></textarea></p>
       <p><input type="submit" name="submit" id="button" value="Submit" /></p>
   </form>

</body>
</html>

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