Javascript DOM HTML Textarea required Property set

Introduction

Set a text area to be a required part of form submission: 

document.getElementById("myTextarea").required = true;

Click the button to set the required property for the area field.

View in separate window 

<!DOCTYPE html>
<html>
<body>

<form action="/action_page.php">
Text area:<br>
<textarea id="myTextarea" name="adr">
</textarea><br>
<input type="submit">
</form>// w  w  w .java 2  s. c o m
<button onclick="myFunction()">Test</button>

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

<script>
function myFunction() {
  document.getElementById("myTextarea").required = true;
  document.getElementById("demo").innerHTML = "The required property was set.";
}
</script>
</body>
</html>



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