post-form-as-sms-message.html

<form>
  <label for="serialnumber">Enter serial number:</label><br>
  <input type="text" id="serialnumber" name="serialnumber"><br>
  <label for="message">Enter message:</label><br>
  <textarea id="message" name="message"></textarea><br>
  <input type="submit" value="Send SMS" onclick="sendSMS(event)">
</form>
// Generated in cooperation with OpenAI ChatGPT
<script>
  function sendSMS(event) {

    // Prevent the form from being submitted
    event.preventDefault();

    // Get the values of the serial number and message inputs
    var serialNumber = document.getElementById("serialnumber").value;
    var message = document.getElementById("message").value;

    // Create the SMS href using the serial number and message
    var href = "sms:+461234567?body=" + encodeURIComponent(message + "\n") +  "Serialnumber: " + encodeURIComponent(serialNumber);

    // Open the SMS href in a new window
    window.open(href, "_blank");

  }
</script>