Programs in JavaScript

6. Program to change color of the text box if empty string submitted. 

<script>
function funup(val)
{
	if(val.length>0)
	document.getElementById('t1').style.borderColor="silver";
}
function fun1()
{
	txt = document.getElementById('t1').value
	if(txt.length == 0)
	document.getElementById('t1').style.borderColor = "red"
}
</script>
<input type="text" id="t1" onkeyup="funup(this.value)">
<input type="button" value="Submit" onclick="fun1()">
Output :