HTML FORMS

Frontend

Hvorfor skal vi bekymre os om webformularer?

Det, der driver web'et
Interaktioner mellem bruger og websted
Interaktion mellem mennesker
The "money-maker"
- E-handel
- Lead-generatoion (nyhedsbrev)
osv.

En deal-breaker
Noget, der er i vejen
- UX bliver meget vigtigt

Hvad er webformularer?

Sikre sig, at de rigtige data er angivet

Standardiseret

Vi stiller ingen spørgsmål, vi udfylder bare formularen

Fysisk modpart

Eksempler

Facebook post

Form tags

<form>
  
</form>

Form tags

<form>
  
  <label>Label</label>
  
</form>

Form tags

<form>
  
  <label>Label</label>
  <input>
  
</form>

Form tags

<form>
  
  <label>Label</label>
  <input>
  
  <button>Submit button</button>
  
</form>

Form tags

<form>
  
  <label>Label</label>
  <input>
  
  <button>Submit button</button>
  
</form>

Label

Submit button

Hvorfor fokusere på HTML?

https://drewdevault.com/2021/10/17/Reliability.html

It’s hard to overstate just how much software developers have given the finger to reliability in the past 10 years or so. It’s for the simplest, silliest reasons, too, like those web forms.

My web browser has been perfectly competent at submitting HTML forms for the past 28 years, but for some stupid reason some ~~asshole~~ developer decided to reimplement all of the form semantics in JavaScript,

and now I can’t pay my electricity bill without opening up the dev tools. Imagine what it’s like to not know how to do that. Imagine if you were blind.

https://drewdevault.com/2021/10/17/Reliability.html

It’s hard to overstate just how much software developers have given the finger to reliability in the past 10 years or so. It’s for the simplest, silliest reasons, too, like those web forms.

and now I can’t pay my electricity bill without opening up the dev tools. Imagine what it’s like to not know how to do that. Imagine if you were blind.

https://drewdevault.com/2021/10/17/Reliability.html

and now I can’t pay my electricity bill without opening up the dev tools. Imagine what it’s like to not know how to do that. Imagine if you were blind.

😬

https://webaim.org/projects/million/#labels

https://webaim.org/projects/million/

Tilgængelighed

Grupper

States (:hover, :focus, fejlmeddelelser osv.)

Tilgængelighed

Webtilgængelighed

Gå ind på dsb.dk. Herefter må du kun bruge tastaturet.

Bestil en enkelt billet fra København til Aarhus i morgen

Semantics

Search for a topic of interest...

Search

HTML forms

Semantics

A better user experience

HTML forms

Frontend elective, 3rd SEM

Search

Search for a topic of interest...

HTML forms

HTML tags gør det klart for browseren, hvad betydningen af en side og dens indhold er

og skærmlæsere

Alle tags er teknisk set semantiske*, men det handler om at bruge de rigtige tags de rigtige steder

* Man henviser dog ofte til tags, der bærer en mere specifik betydning angående indholdets type eller funktion, som kan hjælpe skærmlæsere, søgemaskiner og browsere med at forstå og formidle indholdet mere præcist.

Semantik

A better user experience

HTML forms

Frontend elective, 3rd SEM

HTML forms

<header>
<search>
<nav>
<main>
<article>
<aside>
<footer>

Ikke-semantisk

Semantisk

Det rigtige tag og de rigtige attributter sikrer en funktionsdygtig og tilgængelig formular

<a href="#0" class="button">
  I am a fake unsemantic button
</a>

<div class="button">
  I am even worse
</div>

<button type="button">
  I am a real semantic button
</button>

<button>
  <a href="#0" class="button">
    WTF?!
  </a>
</button>

💩

<div
    class="btn"
    role="button"
    aria-pressed="false"
    tabindex="0">
</div>

wrapper.addEventListener("keydown", e => {
    if (e.key === " " || e.key === "Enter" || e.key === "Spacebar") {
        toggleBtn(e.target);
    }
});

https://benfrain.com/converting-divs-into-accessible-pseudo-buttons/

Hvorfor er semantisk
markup vigtigt i forms?

Tilgængelighed

Screen readers
Keyboard navigation
etc...

Screen readers
Keyboard navigation

Server handling

Right format
Reliable data

Hvorfor er semantisk
markup vigtigt i forms?

Tilgængelighed

Screen readers
Keyboard navigation

Server handling

Right format
Reliable data

Hvorfor er semantisk
markup vigtigt i forms?

Tilgængelighed

Screen readers
Keyboard navigation

Funktionalitet

Right format
Reliable data

Hvorfor er semantisk
markup vigtigt i forms?

Screen readers
Keyboard navigation

Right format
Reliable data

Hvorfor er semantisk
markup vigtigt i forms?

Tilgængelighed

Funktionalitet

Divitis

<div>Denne tekst er vigtig, alvorlig eller akut</div>

?

Lider du af

Hvad er det rigtige tag?

Divitis

<strong>Denne tekst er vigtig, alvorlig eller akut</strong>

?

<strong>

Lider du af

Divitis

<div>Jeg er et selvstændigt indholdselement</div>

?

Lider du af

Divitis

<article>Jeg er et selvstændigt indholdselement</article>

?

<article>

Lider du af

Divitis

<div>Websitets hovedindhold</div>

?

Lider du af

Divitis

<main>Websitets hovedindhold</main>

?

<main>

Lider du af

Divitis

<div>Indtast dit navn</div>
<input type="text">

?

Lider du af

Divitis

?

<label>

Lider du af

<label>Indtast dit navn</label>
<input type="text">

Anatomien

<label>

<label>

form lingo

Anatomien

Form tags

<form>
  
  <label>Label</label>
  <input>
  
  <button>Submit button</button>
  
</form>

Label

Submit button

Form tags

<form>
      
  <label for="full-name">Full name</label>
  <input
         id="full-name"
         name="fname"
         type="text">

  <label for="email">Email</label>
  <input
         id="email"
         name="email"
         type="email">
  
  <button>Submit</button>
  
</form>

Full name

Submit

<form action="[URL]" method="GET">
      
  <label for="full-name">Full name</label>
  <input
         id="full-name"
         name="fname"
         type="text">

  <label for="email">Email</label>
  <input
         id="email"
         name="email"
         type="email">
  
  <button type="submit">Submit</button>
  
</form>

Form tags

Submitting

<input type="submit" value="Send data">

<!-- or -->

<button type="submit">Send data</button>

<!-- or just -->

<button>Send data</button> <!-- default is submit -->

maybe never use this

Hvis formularen ikke skal submitte...

<button>Send data</button> <!-- default is submit -->

<button type="button">Send data</button> <!-- override the default -->

Label/input association

<input type="checkbox" id="my-id">
<label for="my-id">Whole row</label>

Labels er forbundet med deres respektive input via for attributten og inputtets id attribut.

Hver <input> skal helsthave tilknyttet en <label>. Dette gør feltet tilgængeligt for skærmlæsere og giver brugeren et større mål, da man kan klikke på <label> for at fokusere input-feltet.

Label/input association

<input type="checkbox" id="my-id">
<label for="my-id">Whole row</label>

Labels er forbundet med deres respektive input via for attributten og inputtets id attribut.

Label/input association

<input type="checkbox" id="my-id">
<label for="my-id">Whole row</label>

Label/input association

<label>
  <input type="checkbox">
  Whole row
</label>

Label/input association

<label for="my-id">
  <input id="my-id" type="checkbox">
  Whole row
</label>

Label/input association

<label for="my-id">
  <input id="my-id" type="checkbox">
  Whole row
</label>

https://css-tricks.com/html-inputs-and-labels-a-love-story/

Hvad søgefelter?

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/search

Search landmark

https://www.scottohara.me/blog/2023/03/24/search-element.html

<search>
  <label for=s>Site</label>
  <input type=search id=s>
  <button>Go!</button>
</search>

Instructions/input association

<label for="password">
	Password (Required)
	<span>Your password should be at least 6 characters long</span>
  <input type="password" id="password">
</label>

Instructions/input association

<label for="my-id">Label</label>
<input id="my-id" type="text" aria-describedby="instruction">

<p id="instruction">Instruction</p>

<fieldset>
  <legend>Choose your favorite superhero</legend>
  
  <label for="batman">Batman</label>
  <input id="batman" name="fav-hero" value="batman">
  
  ...
</fieldset>

Groups

Type attributes

<input type="        ">

text

number

radio

checkbox

tel

date

<input type="        ">

text

number

radio

checkbox

tel

date

Single line text field

Type attributes

<input type="        ">

text

number

radio

checkbox

tel

date

Numbers

Type attributes

<input type="        ">

text

number

radio

checkbox

tel

date

Type attributes

<input type="        ">

text

number

radio

checkbox

tel

date

Radio button

Type attributes

<input type="        ">

text

number

radio

checkbox

tel

date

Checkbox

Type attributes

<input type="        ">

text

number

radio

checkbox

tel

date

Phone number

Type attributes

<input type="        ">

text

number

radio

checkbox

tel

date

Date

Type attributes

<input list="list">
<datalist id="list">
  <option value="Gryffindor">
</datalist>

<select>
  <optgroup label="Theropods">
    <option>Tyrannosaurus</option>
...

<textarea>
  It was a dark and stormy night...
</textarea>

<select>
  <optgroup label="Theropods">
    <option>Tyrannosaurus</option>
...

<textarea>
  It was a dark and stormy night...
</textarea>

<input list="list">
<datalist id="list">
  <option value="Gryffindor">
</datalist>

<select>
  <optgroup label="Theropods">
    <option>Tyrannosaurus</option>
...

<textarea>
  It was a dark and stormy night...
</textarea>

<input list="list">
<datalist id="list">
  <option value="Gryffindor">
</datalist>

Type attributes

Type attributes?

<input type="tel">

https://better-mobile-inputs.netlify.app/

Radios & checkboxes

Radios & checkboxes

radio buttons

checkboxes

Radio eller checkbox?

Choose your favorite

Spider-man
Superman
Batman

radio buttons

Choose toppings

Cheese
Tomatoes
Ham

checkboxes

Radio eller checkbox?

Radio/checkbox attributter

<form>
  <fieldset>
    <legend>Choose your interests</legend>
    <div class="form-control">
      <input type="checkbox" id="coding" name="interest" value="coding" checked>
      <label for="coding">Coding</label>
    </div>
    <div class="form-control">
      <input type="checkbox" id="music" name="interest" value="music">
      <label for="music">Music</label>
    </div>
  </fieldset>
</form>

Radio/checkbox attributter

<label>
  <input type="checkbox">
  Whole row
</label>

Hvilke andre attributter?

<form>
  <label>Enter your email</label>
  <input
    type="email"
    >
</form>

<form>
  <label>Enter your email</label>
  <input
    type="email"
    name="email"
    >
</form>

Hvilke andre attributter?

<form>
  <label>Enter your email</label>
  <input
    type="email"
    name="email"
    placeholder="e.g. john@doe.com"
    >
</form>

Hvilke andre attributter?

<form>
  <label>Enter your email</label>
  <input
    type="email"
    name="email"
    placeholder="e.g. john@doe.com"
    value="Prefilled"
    >
</form>

Hvilke andre attributter?

What other attributes?

<form>
  <label>Enter your email</label>
  <input
    type="email"
    name="email"
    placeholder="e.g. john@doe.com"
    value="Prefilled"
    class="email-field"
    >
</form>

<form>
  <label>Enter your email</label>
  <input
    type="email"
    name="email"
    placeholder="e.g. john@doe.com"
    value="Prefilled"
    class="email-field"
    required
    >
</form>

Hvilke andre attributter?

<form>
  <label>Enter your email</label>
  <input
    type="email"
    name="email"
    placeholder="e.g. john@doe.com"
    value="Prefilled"
    class="email-field"
    required
    readonly
    >
</form>

Hvilke andre attributter?

<form>
  <label>Enter your email</label>
  <input
    type="email"
    name="email"
    placeholder="e.g. john@doe.com"
    value="Prefilled"
    class="email-field"
    required
    readonly
    disabled>
</form>

name

Hvilke andre attributter?

<form>
  <label>Enter your email</label>
  <input
    type="email"
    name="email"
    placeholder="e.g. john@doe.com"
    value="Prefilled"
    class="email-field"
    required
    readonly
    disabled>
</form>

name

Hvilke andre attributter?

Vigtig attribut

is used by the server to identify the fields in form submits

name

Some of the inputs also share the same name which is important to note because it allows the same data property to have multiple values.

Exercise

Validering

<form>
  
    <h2>Sign up to our service</h2>
  
    <div class="form-group">
      <label for="email">Email address</label>
      
      <input
             id="email"
             name="email"
             type="email"
             required>
    </div>

    <div class="form-group">
      <label for="username">Username</label>
      <span>Must be between 5 and 10 characters long</span>
      <input
             id="username"
             name="username"
             type="text"
             minlength="5"
             maxlength="10"
             required>
    </div>

    <div class="form-group">
      <label for="password">Password</label>
      <span>Must be at least 8 characters with at least 1 digit, 1 lowercase and 1 uppercase character</span>
      <input
             id="password"
             name="password"
             type="password"
             pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}"
             required>
    </div>

  <button>Sign up</button>
</form>

Form styling

:hover
:focus
:valid
:invalid
:checked
:disabled

https://developer.mozilla.org/en-US/docs/Web/CSS/Pseudo-classes#Index_of_standard_pseudo-classes

input[type="text"]:valid {
  color: green;
}

input[type="text"]:invalid {
  color: red;
}

<form>
  <label for="pass">Enter a password</label>
  <input
  pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}"
  type="password"
  id="pass"
  required>
  
  <button type="submit">Set password</button>
</form>

Reg

Ex

ular pression

Reg

Ex

<form>
  <label for="pass">Enter a password</label>
  <input
  pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}"
  type="password"
  id="pass"
  required>
  
  <button type="submit">Set password</button>
</form>

ular pression

At least 8 characters

<input
  pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}"
  type="password"
  required
>

Regular expression from html5pattern.com

At least 1 uppercase character

At least 1 lowercase character

At least 1 number

https://github.com/ziishaned/learn-regex

Learn RegEx

min(length)/max(length)

is used to specify the maximum length of the value that can be entered

Used alongside the range attribute to determine what the min/max values should be. You can use step to determine the interval of your range input.

maxlength/minlength:

max/min:

User Experience

Don't make the user feel stupid

Be concise

Do we really need all this?

(Reduce cognitive load)

Single column layouts

Grouping inputs

<form>
  <fieldset>
    <legend>Personal information</legend>
    <label>
      First Name<br>
      <input name="fname">
    </label>
    <label>
      Last Name<br>
      <input name="lname">
    </label>
    <label>
      Email<br>
      <input name="email" type="email">
    </label>
  </fieldset>
</form>

https://www.uxmatters.com/mt/archives/2006/07/label-placement-in-forms.php

Label Placement in Forms

Visual contraints

Optional instead of required

- maybe?

https://www.nngroup.com/articles/web-form-design/

Test with users

avoid this ->

Be permissive

🤔

Be permissive

🤔

Choose the right HTML element

https://uxdesign.cc/if-satan-was-a-web-designer-dc5cdf06dff9

Choose the right HTML element

How do I find out what to use?

Test with users

Which one do I use?

What data are we requesting? Is it relevant?

Users may feel uncomfortable sharing personal information

Make sure to state why you need "sensitive" data

Hvad er galt her?

Placeholders

Placeholders as labels

It's difficult to remember what information belongs in a field, and to check for and fix errors

— nngroup

Disappearing placeholder text strains users’ short-term memory.
Without labels, users cannot check their work before submitting a form.
Placeholder text that disappears when the cursor is placed in a form field is irritating for users navigating with the keyboard.
Users may mistake a placeholder for data that was automatically filled in.

https://www.nngroup.com/articles/form-design-placeholders/

Placeholders

👎🏻

Placeholders

👍🏻

Placeholders

Always use a label!

If we have to leave out the <label> e.g. due to design constraints, what do we need to ensure in terms of UX?

Relevant feedback is important

You Might Not Need A Label

Scannability

You Might Not Need A Label

province + country

farm size

name

d.o.b.

Konteksten er vigtig for forståelsen

members

https://youtu.be/DD-8WjC79yQ?t=3164

Byg en "pets"-formular

name
dob
species
image
traits
activityLevel
isAlive
race

Opret en HTML-struktur af en formular til din "pets"-database.

Find de relevante form controls til indsamling af dine data:

HTML FORMS

Hvorfor skal vi bekymre os om webformularer?

Hvad er webformularer?

Fysisk modpart

Eksempler

Form tags

Form tags

Form tags

Form tags

Form tags

Hvorfor fokusere på HTML?

😬

Tilgængelighed

States (:hover, :focus, fejlmeddelelser osv.)

Tilgængelighed

Webtilgængelighed

Semantics

Search

HTML forms

Semantics

Search

HTML forms

HTML tags gør det klart for browseren, hvad betydningen af en side og dens indhold er

Alle tags er teknisk set semantiske*, men det handler om at bruge de rigtige tags de rigtige steder

Semantik

HTML forms

Ikke-semantisk

Semantisk

Det rigtige tag og de rigtige attributter sikrer en funktionsdygtig og tilgængelig formular

💩

Hvorfor er semantisk markup vigtigt i forms?

Hvorfor er semantisk markup vigtigt i forms?

Hvorfor er semantisk markup vigtigt i forms?

Hvorfor er semantisk markup vigtigt i forms?

Hvorfor er semantisk markup vigtigt i forms?

Divitis

Divitis

?

Divitis

?

Divitis

?

Divitis

?

Divitis

?

Divitis

?

Divitis

?

Divitis

?

Anatomien

Anatomien

Form tags

Form tags

Form tags

Submitting

Hvis formularen ikke skal submitte...

Label/input association

Label/input association

Label/input association

Label/input association

Label/input association

Label/input association

Hvad søgefelter?

Search landmark

Instructions/input association

Instructions/input association

Groups

Type attributes

Type attributes

Type attributes

Type attributes

Type attributes

Type attributes

Type attributes

Type attributes

Type attributes

Type attributes?

Hvorfor er semantisk
markup vigtigt i forms?

Hvorfor er semantisk
markup vigtigt i forms?

Hvorfor er semantisk
markup vigtigt i forms?

Hvorfor er semantisk
markup vigtigt i forms?

Hvorfor er semantisk
markup vigtigt i forms?