An example of using trim JavaScript function with user entered text

JavaScript / HTML/ CSS Code
Output
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function trimstring(){
var txtmessage = document.getElementById("trimdemo").value;

alert ("The string before trim: \n" + txtmessage);

var str_trim = txtmessage.trim();

alert ("The string after trim: \n" + str_trim);


alert ("The original string after using trim: \n" + txtmessage);

}
</script>
<style>
.txtarea{
    height: 200px;
    width: 250px;
    background-color:#2e6da4;
    border: 2px solid black;
    color:#fff;
    
}
.btncls{
    background-color:#4F6677;
    border: #2e6da4;
  	font-family: Arial, Geneva, Arial, Helvetica,  sans-serif;
	font-size: 15px;
    color: #FFFFFF;
    letter-spacing: 1px;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: normal;

    border-radius: 4px;
    line-height: 1.5;
    text-decoration:none;
} 
</style>
</head>

<body>
<p><button class="btncls" onclick="trimstring()">Execute trim method</button></p>
<textarea id="trimdemo" class="txtarea">    Some demo text with spaces before and after   

</body>
</html>