Javascript DOM HTML Input Text pattern Property set

Introduction

Set the pattern of a text field to only contain numbers from 1 to 3: 

document.getElementById("myText").pattern = "[1-3]";

Click button to set a regular expression that the text field's value will be checked against.

View in separate window 

<!DOCTYPE html>
<html>
<body>

<form action="/action_page.php">
  Zip code: <input type="text" id="myText" name="zip_code">
  <input type="submit">
</form>//from w  w  w.j  av  a  2s  .  co m
<button onclick="myFunction()">Test</button>

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

<script>
function myFunction() {
  document.getElementById("myText").pattern = "[1-3]";
  document.getElementById("myText").title = "A number from 1 to 3";
  document.getElementById("demo").innerHTML = "The text field can now only contain numbers from 1 to 3.";
}
</script>

</body>
</html>



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