Tags: input

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Thursday, September 17th, 2020

Geri Reid - Forms best practice

This is a terrific collection of guidelines for form design.

Wednesday, August 26th, 2020

Submitting a form with datalist

I’m a big fan of HTML5’s datalist element and its elegant design. It’s a way to progressively enhance any input element into a combobox.

You use the list attribute on the input element to point to the ID of the associated datalist element.

<label for="homeworld">Your home planet</label>
<input type="text" name="homeworld" id="homeworld" list="planets">
<datalist id="planets">
 <option value="Mercury">
 <option value="Venus">
 <option value="Earth">
 <option value="Mars">
 <option value="Jupiter">
 <option value="Saturn">
 <option value="Uranus">
 <option value="Neptune">
</datalist>

It even works on input type="color", which is pretty cool!

The most common use case is as an autocomplete widget. That’s how I’m using it over on The Session, where the datalist is updated via Ajax every time the input is updated.

But let’s stick with a simple example, like the list of planets above. Suppose the user types “jup” …the datalist will show “Jupiter” as an option. The user can click on that option to automatically complete their input.

It would be handy if you could automatically submit the form when the user chooses a datalist option like this.

Well, tough luck.

The datalist element emits no events. There’s no way of telling if it has been clicked. This is something I’ve been trying to find a workaround for.

I got my hopes up when I read Amber’s excellent article about document.activeElement. But no, the focus stays on the input when the user clicks on an option in a datalist.

So if I can’t detect whether a datalist has been used, this best I can do is try to infer it. I know it’s not exactly the same thing, and it won’t be as reliable as true detection, but here’s my logic:

  • Keep track of the character count in the input element.
  • Every time the input is updated in any way, check the current character count against the last character count.
  • If the difference is greater than one, something interesting happened! Maybe the user pasted a value in …or maybe they used the datalist.
  • Loop through each of the options in the datalist.
  • If there’s an exact match with the current value of the input element, chances are the user chose that option from the datalist.
  • So submit the form!

Here’s how that translates into DOM scripting code:

document.querySelectorAll('input[list]').forEach( function (formfield) {
  var datalist = document.getElementById(formfield.getAttribute('list'));
  var lastlength = formfield.value.length;
  var checkInputValue = function (inputValue) {
    if (inputValue.length - lastlength > 1) {
      datalist.querySelectorAll('option').forEach( function (item) {
        if (item.value === inputValue) {
          formfield.form.submit();
        }
      });
    }
    lastlength = inputValue.length;
  };
  formfield.addEventListener('input', function () {
    checkInputValue(this.value);
  }, false);
});

I’ve made a gist with some added feature detection and mustard-cutting at the start. You should be able to drop it into just about any page that’s using datalist. It works even if the options in the datalist are dynamically updated, like the example on The Session.

It’s not foolproof. The inference relies on the difference between what was previously typed and what’s autocompleted to be more than one character. So in the planets example, if someone has type “Jupite” and then they choose “Jupiter” from the datalist, the form won’t automatically submit.

But still, I reckon it covers most common use cases. And like the datalist element itself, you can consider this functionality a progressive enhancement.

Saturday, June 13th, 2020

Striking a Balance Between Native and Custom Select Elements | CSS-Tricks

I think this a solution worthy of Solomon. In this case, the Gordian knot is the select element and its inevitable recreation in order to style it.

What if we instead deliver a native select by default and replace it with a more aesthetically pleasing one if possible? That’s where the “hybrid” select idea comes into action. It’s “hybrid” because it consists of two selects, showing the appropriate one at the right moment:

  • A native select, visible and accessible by default
  • A custom select, hidden until it’s safe to be interacted with a mouse

The implementation uses a genius combination of a hover media query and an adjacent sibling selector in CSS. It has been tested on a number of device/platform/browser combinations but more tests are welcome!

What I love about this solution is that it satisfies the stakeholders insisting on a custom component but doesn’t abandon all the built-in accessibility that you get from native form controls.

Monday, May 11th, 2020

Creating an Accessible Range Slider with CSS | a11y with Lindsey

If you want an accessible slider component, the trick isn’t to use a whole load of JavaScript. The trick is to use the native input type="range" and then figure out the CSS you need (which, alas, involves lots of vendor prefixes).

Thursday, April 23rd, 2020

Limiting input type=”color” to a certain palette (from an image) | Christian Heilmann

I never thought of combining the datalist element with input type="color"—it’s pretty cool that it just works!

Monday, April 20th, 2020

Better Form Inputs for Better Mobile User Experiences | CSS-Tricks

Here’s one simple, practical way to make apps perform better on mobile devices: always configure HTML input fields with the correct type, inputmode, and autocomplete attributes. While these three attributes are often discussed in isolation, they make the most sense in the context of mobile user experience when you think of them as a team.

This is an excellent deep dive with great advice:

You may think that you are familiar with the basic autocomplete options, such as those that help the user fill in credit card numbers or address form fields, but I’d urge you to review them to make sure that you are aware of all of the options. The spec lists over 50 values!

Monday, April 6th, 2020

Chromium Blog: Updates to form controls and focus

Chromium browsers—Chrome, Edge, et al.—are getting a much-needed update to some interface elements like the progess element, the meter element, and the range, date, and color input types.

This might encourage more people to use native form controls …but until we can more accurately tweak the styling of these elements, people are still going to reach for more bloated, less accessible JavaScript-driven options. Over-engineering is under-engineering

Monday, March 23rd, 2020

Inclusive Inputs « Texte | ovl – code & design

This is a great walkthough of making a common form pattern accessible. No complex code here: some HTML is all that’s needed.

Friday, February 28th, 2020

Why the GOV.UK Design System team changed the input type for numbers - Technology in government

Some solid research here. Turns out that using input type=”text” inputmode=”numeric” pattern="[0-9]*" is probably a better bet than using input type="number".

Monday, February 10th, 2020

Custom Styling Form Inputs With Modern CSS Features | CSS-Tricks

It’s now easier than ever to style form controls without sacrificing semantics and accessibility:

The reason is that we can finally style the ::before and ::after pseudo-elements on the <input> tag itself. This means we can keep and style an <input> and won’t need any extra elements. Before, we had to rely on the likes of an extra <div> or <span>, to pull off a custom design.

The demo is really nice. And best of all, you can wrap all of these CSS enhancements in a feaure query:

Hopefully, you’re seeing how nice it is to create custom form styles these days. It requires less markup, thanks to pseudo-elements that are directly on form inputs. It requires less fancy style switching, thanks to custom properties. And it has pretty darn good browser support, thanks to @supports.

Saturday, January 25th, 2020

HTML attributes to improve your users’ two factor authentication experience - Twilio

The many ways of improving a single form field in HTML.

I love these kinds of deep dives into markup!

Friday, January 10th, 2020

Listen To Me And Not Google: HeydonWorks

We have to stop confusing the excesses of capitalism with the hallmarks of quality. Sometimes Google aren’t better, they’re just more pervasive.

cough AMP cough

Thursday, September 19th, 2019

An HTML attribute potentially worth $4.4M to Chipotle - Cloud Four

When I liveblogged Jason’s talk at An Event Apart in Chicago, I included this bit of reporting:

Jason proceeds to relate a long and involved story about buying burritos online from Chipotle.

Well, here is that story. It’s a good one, with some practical takeaways (if you’ll pardon the pun):

  1. Use HTML5 input features
  2. Support autofill
  3. Make autofill part of your test plans

Tuesday, August 27th, 2019

Web Forms: Now You See Them, Now You Don’t! by Jason Grigsby

Jason is on stage at An Event Apart Chicago in a tuxedo. He wants to talk about how we can make web forms magical. Oh, I see. That explains the get-up.

We’re always being told to make web forms shorter. Luke Wroblewski has highlighted the work of companies that have reduced form fields and increased conversion.

But what if we could get rid of forms altogether? Wouldn’t that be magical!

Jason will reveal the secrets to this magic. But first—a volunteer from the audience, please! Please welcome Joe to the stage.

Joe will now log in on a phone. He types in the username. Then the password. The password is hodge-podge of special characters, numbers and upper and lowercase letters. Joe starts typing. Jason takes the phone and logs in without typing anything!

The secret: Jason was holding an NFC security key in his hand. That works with a new web standard called WebAuthn.

Passwords are terrible. People share them across sites, but who can blame them? It’s hard to remember lots of passwords. The only people who love usernames and passwords are hackers. So sites are developing other methods to try to keep people secure. Two factor authentication helps, although it doesn’t help us with phishing attacks. The hacker gets the password from the phished user …and then gets the one-time code from the phished user too.

But a physical device like a security key solves this problem. So why aren’t we all using security keys (apart from the fear of losing the key)? Well, until WebAuthn, there wasn’t a way for websites to use the keys.

A web server generates a challenge—a long string—that gets sent to a website and passed along to the user. The user’s device generates a credential ID and public and private keys for that domain. The web site stores the public key and credential ID. From then on, the credential ID is used by the website in challenges to users logging in.

There were three common ways that we historically proved who we claimed to be.

  1. Something you know (e.g. a password).
  2. Something you have (e.g. a security key).
  3. Something you are (e.g. biometric information).

These are factors of identification. So two-factor identification is the combination of any of those two. If you use a security key combined with a fingerprint scanner, there’s no need for passwords.

The browser support for the web authentication API (WebAuthn) is a bit patchy right now but you can start playing around with it.

There are a few other options for making logging in faster. There’s the Credential Management API. It allows someone to access passwords stored in their browser’s password manager. But even though it’s newer, there’s actually better browser support for WebAuthn than Credential Management.

Then there’s federated login, or social login. Jason has concerns about handing over log-in to a company like Facebook, Twitter, or Google, but then again, it means fewer passwords. As a site owner, there’s actually a lot of value in not storing log-in information—you won’t be accountable for data breaches. The problem is that you’ve got to decide which providers you’re going to support.

Also keep third-party password managers in mind. These tools—like 1Password—are great. In iOS they’re now nicely integrated at the operating system level, meaning Safari can use them. Finally it’s possible to log in to websites easily on a phone …until you encounter a website that prevents you logging in this way. Some websites get far too clever about detecting autofilled passwords.

Time for another volunteer from the audience. This is Tyler. Tyler will help Jason with a simple checkout form. Shipping information, credit card information, and so on. Jason will fill out this form blindfolded. Tyler will first verify that the dark goggles that Jason will be wearing don’t allow him to see the phone screen. Jason will put the goggles on and Tyler will hand him the phone with the checkout screen open.

Jason dons the goggles. Tyler hands him the phone. Jason does something. The form is filled in and submitted!

What was the secret? The goggles prevented Jason from seeing the phone …but they didn’t prevent the screen from seeing Jason. The goggles block everything but infrared. The iPhone uses infrared for Face ID. So the iPhone, it just looked like Jason was wearing funky sunglasses. Face ID then triggered the Payment Request API.

The Payment Request API allows us to use various payment methods that are built in to the operating system, but without having to make separate implementations for each payment method. The site calls the Payment Request API if it’s supported (use feature detection and progressive enhancement), then trigger the payment UI in the browser. The browser—not the website!—then makes a call to the payment processing provider e.g. Stripe.

E-commerce sites using the Payment Request API have seen a big drop in abandonment and a big increase in completed payments. The browser support is pretty good, especially on mobile. And remember, you can use it as a progressive enhancement. It’s kind of weird that we don’t encounter it more often—it’s been around for a few years now.

Jason read the fine print for Apple Pay, Google Pay, Microsoft Pay, and Samsung Pay. It doesn’t like there’s anything onerous in there that would stop you using them.

On some phones, you can now scan credit cards using the camera. This is built in to the operating system so as a site owner, you’ve just got to make sure not to break it. It’s really an extension of autofill. You should know what values the autocomplete attribute can take. There are 48 different values; it’s not just for checkouts. When users use autofill, they fill out forms 30% faster. So make sure you don’t put obstacles in the way of autofill in your forms.

Jason proceeds to relate a long and involved story about buying burritos online from Chipotle. The upshot is: use the autocomplete, type, maxlength, and pattern attributes correctly on input elements. Test autofill with your forms. Make it part of your QA process.

So, to summarise, here’s how you make your forms disappear:

  1. Start by reducing the number of form fields.
  2. Use the correct HTML to support autofill. Support password managers and password-pasting. At least don’t break that behaviour.
  3. Provide alternate ways of logging in. Federated login or the Credentials API.
  4. Test autofill and other form features.
  5. Look for opportunities to replace forms entirely with biometrics.

Any sufficiently advanced technology is indistinguishable from magic.

—Arthur C. Clarke’s Third Law

Don’t our users deserve magical experiences?

Friday, August 23rd, 2019

4 Rules for Intuitive UX – Learn UI Design

  1. Obey the Law of Locality
  2. ABD: Anything But Dropdowns
  3. Pass the Squint Test
  4. Teach by example

Saturday, August 3rd, 2019

Form design: from zero to hero all in one blog post by Adam Silver

This is about designing forms that everyone can use and complete as quickly as possible. Because nobody actually wants to use your form. They just want the outcome of having used it.

LukeW | “Mad Libs” Style Form Increased Conversion by 25-40%

I was chatting with Rachel at work the other day about conversational forms, and I mentioned that I kicked that whole thing off with the mad libs style form on Huffduffer. Here’s the research that Luke later did on whether this style of form could increase conversion.

Sunday, July 21st, 2019

Maybe You Don’t Need a Date Picker | Adrian Roselli

In some situations, a date picker is overkill:

I have relied on plain text inputs as date fields with custom validation for the site, typically using the same logic on the client and the server. For known dates — birthdays, holidays, anniversaries, etc — it has tested well.

Tuesday, July 16th, 2019

Initial thoughts on standardizing form controls | Greg Whitworth

Greg has done a lot of research into developer frustrations with customising form controls.

My current thinking in this space, and I know some folks will find this controversial, but I think we should completely standardize in-page form controls with no limitations on their styling capabilities. What do I mean by in-page controls? I am referring to any form control or component that is rendered within the content process. This standardization would include the sub-parts and their related states and how these are exposed (probably through CSS psuedo classes or HTML attributes). This will enable the shadow-dom to be encapsulated while providing web developers with a consistent experience to adjust to match their brand and needs of their site/application.

Thursday, July 4th, 2019

User Inyerface - A worst-practice UI experiment

It’s all fun and games until you realise that everything in here was inspired by actual interfaces out there on the web.