Javascript DOM HTML Input Email compare defaultValue and value property

Introduction

An example that shows the difference between the defaultValue and value property:

Change the email address of the email field, and then click the button below.

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<!DOCTYPE html>
<html>
<body>
E-mail: <input type="email" id="myEmail" value="css@example.com">
<button type="button" onclick="myFunction()">Test</button>

<p id="demo"></p>

<script>
function myFunction() {//from   ww  w . ja  va  2s  .c  o m
  var x = document.getElementById("myEmail");
  var defaultVal = x.defaultValue;
  var currentVal = x.value;

  if (defaultVal == currentVal) {
    document.getElementById("demo").innerHTML = "Default value and current value is the same: "
    + x.defaultValue + " and " + x.value
    + "<br>Change the email address of the email field to see the difference!";
  } else {
    document.getElementById("demo").innerHTML = "The default value was: " + defaultVal
    + "<br>The current value is: " + currentVal;
  }
}
</script>

</body>
</html>



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