linux-kernel - HTML and Javascript code for validating a text field using Javascript and showing error below the text field if the value entered in the text field is not valid (Two files: form.html and result.html).

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Message-ID: <CAFf+5zj2heroGL4cEMRYS9SCkTwDWQh1T9=3ZeDTM9G0aENThQ@mail.gmail.com>
Date: Fri, 30 May 2025 21:27:26 +0530
From: Amit <amitchoudhary0523@...il.com>
To: linux-kernel@...r.kernel.org
Subject: HTML and Javascript code for validating a text field using Javascript
 and showing error below the text field if the value entered in the text field
 is not valid (Two files: form.html and result.html).

HTML and Javascript code for validating a text field using Javascript
and showing error below the text field if the value entered in the
text field is not valid (Two files: form.html and result.html).

-------------
form.html
-------------

<!DOCTYPE html>
<html>
<head>
<script>
function validateForm() {
  var err = document.getElementById("error")
  var x = document.forms["myForm"]["phone_num"].value;
  var re = /^[0-9]{10}$/
  let result = re.test(x)
  if (result) {
      error.innerHTML = ""
      return true
  } else {
      error.innerHTML = "Please enter a valid phone number."
      error.style.color = "red"
      return false
  }
}
</script>
</head>
<body>

<form name="myForm" action="result.html" onsubmit="return
validateForm()" method="post">
  Phone Number (10 digits only): <input type="text" name="phone_num"><br>
  <span id="error"></span><br>
  <input type="submit" value="Submit">
</form>

--------------
result.html
--------------

Success.