How to count number of characters limit in textarea Javascript

Posted 7 years ago By Ajay Gupta 80981

In this post, i will let you know how to count number of characters limit in textarea and show the available remaining characters that you can enter.

For example, If you are going to send SMS from application then there you can use this validation for apply characters limit.

In this example, you will know the use of onkeyup and onkeydown event.

onkeyup event is triggered when a keyboard key is released and onkeydown event is triggered when a keyboard key is pressed.

<!DOCTYPE html>
<html>
<head>
    <title>Javascript Maxlength Validation with Example</title>
</head>
<body>
    <form>
        <textarea  name="message" placeholder="Type here to see how it work" onkeydown="limitText(this.form.message,this.form.countdown,160);" onkeyup='limitText(this.form.message,this.form.countdown,160);'></textarea>
        You have
        <input readonly type="text" name="countdown" size="3" value="160"> chars left
    </form>
    <script type="text/javascript">
       function limitText(limitField, limitCount, limitNum) {
          if (limitField.value.length > limitNum) {
            limitField.value = limitField.value.substring(0, limitNum);
          } else {
            limitCount.value = limitNum - limitField.value.length;
          }
        }
    </script>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
    <title>Javascript Maxlength Validation with Example</title>
</head>
<body>
    <form>
        <textarea  name="message" placeholder="Type here to see how it work" onkeydown="limitText(this.form.message,this.form.countdown,160);" onkeyup='limitText(this.form.message,this.form.countdown,160);'></textarea>
        You have
        <input readonly type="text" name="countdown" size="3" value="160"> chars left
    </form>
    <script type="text/javascript">
       function limitText(limitField, limitCount, limitNum) {
          if (limitField.value.length > limitNum) {
            limitField.value = limitField.value.substring(0, limitNum);
          } else {
            limitCount.value = limitNum - limitField.value.length;
          }
        }
    </script>
</body>
</html>

Click here to know the Javascript Bootstrap - Textarea count characters validation with example

This is a simple example for character countdown in textarea using Javascript.

Show Demo