<label for="fullName">Name</label>
<input type="text" name="name" id="fullName" placeholder="Full name" required autocomplete="name">

These parts of form has 2 important things. name and autocomplete attribute.

name and autocomplete attribute provide hint for autocomplete.

If you put appropriate value in name and autocomplete these may be hint for autocomplete. It's helpful for mobile user to input payment data (e.g. card number)

You can check autocomplete value in whatwg specification. (this specification is extended from that of W3C)

specification

https://html.spec.whatwg.org/multipage/forms.html#autofill

example

  • nam
  • honorific-prefix
  • given-name
  • additional-name
  • family-name
  • honorific-suffix
  • nickname
  • username
  • new-password
  • current-password
  • organization-title
  • organization

etc...

Attension

Auto-complete only works when the form method is post.

call autocomplete from Javascript

  • user click button to call autocomplete.
  • browser show dialog to input card and address information.
  • after save it, information you need is inputed automatically from saved data.
  • if this is second visit you only select data from dialog.

sample page

https://codepen.io/Tkashiro/full/EajRrG

html

<h1>Credit Card Information</h1>
<form id="cardf-form" action="POST">
  <div>
    <label for="f-email">email</label>
    <input id="f-email" type="email" autocomplete="email" name="email">
  </div>
  <div>
    <label for="f-card-name">card name</label>
    <input id="f-card-name" type="text" autocomplete="cc-name" name="card-name">
  </div>
  <div>
    <label for="f-card-num">card number</label>
    <input id="f-card-num" type="text" autocomplete="cc-number" name="card-num">
  </div>
  <div>
    <label for="f-card-exp-month">card expire month</label>
    <input id="f-card-exp-month" type="text" autocomplete="cc-exp-month" name="card-exp-month">
  </div>
  <div>
    <label for="f-card-exp-year">card expire year</label>
    <input id="f-card-exp-year" type="text" autocomplete="cc-exp-year" name="card-exp-year">
  </div>
  <div>
    <label for="f-card-csc">card security code</label>
    <input id="f-card-csc" type="text" autocomplete="cc-csc" name="card-csc">
  </div>
</form>
<button id="request-autocomplete">Request AutoComplete</button>

Javascript

document.addEventListener('DOMContentLoaded', function(){
    var button = document.querySelectorAll('#request-autocomplete')[0];
    var form = document.querySelectorAll('#cardf-form')[0];
    button.addEventListener('click', function(event) {
        form.requestAutocomplete();
        event.preventDefault();
    });

    form.addEventListener('autocomplete', function() {
    });

    form.addEventListener('autocompleteerror', function(event) {
      if (event.reason == 'invalid') {
      }
      else if (event.reason == 'cancel') {
      }
      else if (event.reason == 'disabled') {
      }
    });
});

Attension

  • you meet to call .requestAutocomplete() in https page.
  • .requestAutocomplete() need to be called from user action. (e.g. click)
  • you have to check whatwg specification about autocomplete value. browser input data automatically by the reference autocomplete value.

Reference