on button submit form code example

Example 1: html submit button

<input type="submit" value="Submit">

Example 2: html submit form onclick

var form = document.getElementById("form-id");

document.getElementById("your-id").addEventListener("click", function () {
  form.submit();
});

Example 3: intput field submit button

<label for="fname">First name:</label><br>
  <input type="text" id="fname" name="fname"><br>