Javascript DOM HTML Input Number compare defaultValue and value property

Introduction

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

Change the number in the number field, and then click the button below.

The default value is not affected when you change the value of the number field.

View in separate window 

<!DOCTYPE html>
<html>
<body>

Number: <input type="number" id="myNumber" value="2">

<button type="button" onclick="myFunction()">Test</button>
<p id="demo"></p>

<script>
function myFunction() {/*w w  w  .  ja v a2  s  . co  m*/
  var x = document.getElementById("myNumber");
  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 number of number field to see the difference!";
  } else {
    document.getElementById("demo").innerHTML = "The default value was: " + defaultVal
    + "<br>The current value is: " + currentVal;
  }
}
</script>

</body>
</html>



PreviousNext

Related