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The Art of Form Validation

Caneco
August 29, 2019

The Art of Form Validation

A form could be simple or exhaustive, can have simple or dynamic values… Either way, all payloads between client and server should be validated. And when errors happen (because they will happen), the user needs help and guidance to solve the problem. How can you achieve the best combination of User Interface (UI), User Experience (UX), and Developer Experience (DX)? Join me and learn all the good tips and tricks using the community's favorite stack: Laravel, Vue.

↓↓↓
Live recording of this talk at Laracon.EU
https://youtube.com/watch?v=rkdlJeHTeCY

Caneco

August 29, 2019
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Transcript

  1. FORM validation
    #TheLaravelKid BEGINS
    LARACON.EU
    The Art of

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  2. So, validtaion…

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  3. So, validation…
    It's required, right?

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  4. I'm Caneco
    Full-Stack Developer ! MEDICARE
    caneco.xyz

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  5. I'm Caneco
    .PHP .JS .HTML .CSS .JSON .SQL
    .GIT .SH .SVG .PNG .PSD .AI

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  6. I'm Caneco
    @enunomaduro's "Schoger"

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  7. I'm Caneco
    from Lisbon, Portugal
    Netherlands here
    Spain here
    Portugal here

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  8. WARNING
    ALL THE FOLLOWING SLIDES CONTAIN
    VALUABLE INFORMATION FOR YOUR DAILY
    LIFE… ALL GIFS ARE FROM THE BADASS TV
    SHOW COBRA KAI THAT YOU ALL MUST
    WATCH… AND ALL THE SLIDES, AND
    CONTENT ARE 100% MADE ON KEYNOTE ̈

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  9. LET'S BEGIN

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  10. Why validate?

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  11. On a regular day in 2019

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  12. 500 million tweets
    source: weforum.org

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  13. 294 billion emails
    source: weforum.org

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  14. 5 billion searches
    source: weforum.org

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  15. ~300 new posts on
    laracasts.com/discuss
    source: the Jeffrey Way

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  16. ~64.5K downloads
    of Spatie packages
    source: spatie.be/open-source

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  17. It's a LOT of data

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  18. It's a
    LOT of data

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  19. through APIs
    [GET] skyscanner-example.dev/v1/flights
    [PATCH] zomato-example.dev/place/123/book
    [GET] openweather-example.dev/fatima
    [GET] musixmatch-example.dev/top-10
    [GET] nasa-example.dev/v9999/planet-x
    [GET] numbers-example.dev/random-number
    [GET] urbandictionary-example.dev/tldr
    [GET] tempmail-example.dev/fresh
    [GET] moviedatabase-example.dev/v1/top/horror
    [GET] ip-example.dev/127.0.0.1

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  20. or in forms

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  21. Validation… do
    we really need it?

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  22. Can't we trust our users?

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  23. MOST DEF

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  24. It's purely just for fun

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  25. Validation 101

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  26. SIGN IN
    Sign in
    Email address
    Password
    SENDING

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  27. SIGN IN
    Sign in
    These credentials do not match our records.
    Email address
    Password

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  28. 1
    2
    3
    4

    9
    10
    11
    12
    name="username"
    type="text"
    "#
    ""$
    name="password"
    type="password"
    "#

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  29. 1
    2
    3
    4
    5

    8
    9
    10
    11
    12
    name="username"
    type="text"
    required
    "#
    ""$
    name="password"
    type="password"
    required
    "#

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  30. SIGN IN
    Sign in
    Email address
    Password
    Please fill in this field.
    Please fill in this field.

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  31. Sign in
    Email address
    example
    Password
    ●●●●●●
    SIGN IN
    SENDING

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  32. SIGN IN
    Sign in
    These credentials do not match our records.
    Email address
    example
    Password

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  33. 1
    2
    3
    4
    5

    8
    9
    10
    11
    12
    name="username"
    type="text"
    required
    "#
    ""$
    name="password"
    type="password"
    required
    "#

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  34. 1
    2
    3
    4
    5

    8
    9
    10
    11
    12
    name="username"
    type="email"
    required
    "#
    ""$
    name="password"
    type="password"
    required
    "#

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  35. SIGN IN
    Sign in
    Email address
    example
    Password
    ●●●●●●
    Please include an '@' in the email address.

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  36. SIGN IN
    Sign in
    Email address
    example@
    Password
    ●●●●●●
    Please enter a part following '@'.

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  37. SIGN IN
    Sign in
    Email address
    example@
    Password
    ●●●●●●
    SENDING
    email

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  38. SIGN IN
    Sign in
    These credentials do not match our records.
    Email address
    example@email
    Password
    ●●●●●●

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  39. 1
    2
    3
    4
    5

    8
    9
    10
    11
    12
    name="username"
    type="email"
    required
    "#
    ""$
    name="password"
    type="password"
    required
    "#

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  40. 1
    2
    3
    4
    5
    6

    8
    9
    10
    11
    12
    name="username"
    type="email"
    pattern=".+@.+\"%+"
    required
    "#
    ""$
    name="password"
    type="password"
    required
    "#

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  41. 1
    2
    3
    4
    5
    6

    8
    9
    10
    11
    12
    13
    name="username"
    type="email"
    pattern=".+@.+\"%+"
    required
    "#
    ""$
    name="password"
    type="password"
    minlength="6"
    required
    "#

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  42. 1
    2
    3
    4
    5
    6

    8
    9
    10
    11
    12
    13
    14
    name="username"
    type="email"
    pattern=".+@.+\"%+"
    required
    "#
    ""$
    name="password"
    type="password"
    minlength="6"
    pattern="^(?=.\d)(?=.[a-z])(?=.*[A-Z]).{8,}$"
    required
    "#

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  43. 1
    2
    3
    4
    5
    6

    8
    9
    10
    11
    12
    13
    14
    name="username"
    type="email"
    pattern=".+@.+\"%+"
    required
    "#
    ""$
    name="password"
    type="password"
    minlenght="6"
    pattern="^(?=.\d)(?=.[a-z])(?=.*[A-Z]).{8,}$"
    required
    "#

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  44. Thank you

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  45. Not exactly…

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  46. HTML5 validation
    depends on the browser

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  47. And it's not that
    simple nor pretty

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  48. 1
    2
    3
    4
    5
    6

    8
    9
    10
    11
    12
    13
    name="username"
    type="email"
    pattern=".+@.+\"%+"
    required
    "#
    ""$
    name="password"
    type="password"
    minlenght="6"
    pattern="^(?=.\d)(?=.[a-z])(?=.*[A-Z]).{8,}$"
    required
    "#

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  49. 1
    2
    3
    4
    5
    6

    20
    function "'invoke(Request $request)
    {
    $request"(validate([
    'username' ") 'required|email',
    'password' ") 'required|min:6|strong_password',
    ]);
    ""$
    }

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  50. JavaScript

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  51. 1

    42

    ""$
    "*form>

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  52. 1

    42

    ""$
    "*form>

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  53. jQueryValidate.js

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  54. 1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    var rules = {
    username: {
    required: true,
    email: true,
    },
    password: {
    required: true,
    minlength: 6,
    },
    }

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  55. 1
    2
    3
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    5
    6
    7
    8
    9
    10
    11
    12
    var rules = {
    username: {
    required: true,
    email: true,
    },
    password: {
    required: true,
    minlength: 6,
    },
    }
    $("#login").validate(rules)

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  56. validate.js

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  57. 1
    2
    3
    4
    let input = {
    username: document.getElementById('username').value(),
    password: document.getElementById('password').value(),
    }

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  58. 1
    2
    3
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    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    let input = {
    username: document.getElementById('username').value(),
    password: document.getElementById('password').value(),
    }
    let rules = {
    username: {
    presence: true,
    email: true
    },
    password: {
    presence: true,
    length: { minimum: 6 },
    },
    }

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  59. 1

    4
    7
    6

    15
    16
    17
    18
    19
    let input = {
    !!"
    }
    let rules = {
    ""$
    }
    if (validate(input, rules)) {
    "+
    }

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  60. VeeValidate

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  61. > npm install vee-validate

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  62. 1
    2
    import Vue from 'vue'
    import VeeValidate from 'vee-validate'

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  63. 1
    2
    3
    4
    import Vue from 'vue'
    import VeeValidate from 'vee-validate'
    Vue.use(VeeValidate)

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  64. 1
    2
    3
    4
    5
    name="username"
    type="email"
    required
    "#

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  65. 1
    2
    3
    4
    5
    6
    7
    name="username"
    v-model="username"
    v-validate
    type="email"
    required
    "#

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  66. 1
    2
    3
    4
    5
    6
    7
    name="username"
    v-model="username"
    v—validate
    type="email"
    required
    "#

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  67. 1
    2
    3
    4
    import Vue from 'vue'
    import VeeValidate from 'vee-validate'
    Vue.use(VeeValidate)

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  68. 1
    2
    3
    4
    5
    6
    import Vue from 'vue'
    import VeeValidate from 'vee-validate'
    Vue.use(VeeValidate, {
    useConstraintAttrs: false,
    })

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  69. 1
    2
    3
    4
    5
    6
    7
    name="username"
    v-model="username"
    v-validate
    type="email"
    required
    "#

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  70. 1
    2
    3
    4
    5
    6
    name="username"
    v-model="username"
    v-validate="'required|email'"
    type="text"
    "#

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  71. 1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    alpha
    alpha_dash
    alpha_num
    alpha_spaces
    before
    between
    confirmed
    credit_card
    date_between
    date_format
    decimal
    digits
    dimensions
    email
    image
    included
    integer
    ip
    is
    is_not
    length
    max_value
    mimes
    min
    max
    min_value
    excluded
    numeric
    regex
    required
    required_if
    size
    url

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  72. Add custom rules

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  73. 1 import { Validator } from 'vee-validate'

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  74. 1
    2
    3
    4
    5
    6
    7
    import { Validator } from 'vee-validate'
    import { STRONG_PASS_REGEX } from '@/helpers/regex_rules'
    const strongPassword = {
    getMessage: field ") `${field} is weak.`,
    validate: value ") STRONG_PASS_REGEX.test(value)
    }

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  75. 1
    2
    3
    4
    5
    6
    7
    import { Validator } from 'vee-validate'
    import { STRONG_PASS_REGEX } from '@/helpers/regex_rules'
    const strongPassword = {
    getMessage: field ") `${field} is weak.`,
    validate: value ") STRONG_PASS_REGEX.test(value)
    }

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  76. 1
    2
    3
    4
    5
    6
    7
    import { Validator } from 'vee-validate'
    import { STRONG_PASS_REGEX } from '@/helpers/regex_rules'
    const strongPassword = {
    getMessage: field ") `${field} is weak.`,
    validate: value ") STRONG_PASS_REGEX.test(value)
    }

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  77. 1
    2
    3
    4
    5
    6
    7
    8
    9
    import { Validator } from 'vee-validate'
    import { STRONG_PASS_REGEX } from '@/helpers/regex-rules'
    const strongPassword = {
    getMessage: field ") `${field} is weak.`,
    validate: value ") STRONG_PASS_REGEX.test(value)
    }
    Validator.extend('strong_password', strongPassword)

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  78. 1
    2
    3
    4
    5
    6
    name="password"
    v-model="password"
    v—validate="'required|strong_password'"
    type="text”
    "#

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  79. Using ErrorBag

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  80. 1
    2
    3
    4
    5
    6
    7
    class="field-input"
    name="username"
    v-model="username"
    v-validate="'required|email'"
    type="text"
    "#

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  81. 1
    2
    3
    4
    5
    6
    7
    8
    9
    10

    Email address
    "*label>
    class="field-input"
    name="username"
    v-model="username"
    v-validate="'required|email'"
    type="text"
    "#

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  82. 1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    class="field-input"
    :class="{ 'has-error': errors.has('username') }"
    >
    Email address
    "*label>
    class="field-input"
    :class="{ 'has-error': errors.has('username') }"
    name="username"
    v-model="username"
    v-validate="'required|email'"
    type="text"
    "#

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  83. 1

    6
    7

    14
    15
    16
    17

    ""$
    "*label>
    ""$
    "#

    The username must be a valid email.
    "*p>

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  84. 1

    6
    7

    14
    15
    16
    17

    ""$
    "*label>
    ""$
    "#

    {{ errors.first('username') }}
    "*p>

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  85. SIGN IN
    Sign in
    The username must be a valid email.
    Email address
    example
    Password
    ●●●●●●
    Email address
    example

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  86. 1
    2
    3
    4
    {{ errors.any() }}
    {{ errors.all() }}
    {{ errors.count() }}
    {{ errors.clear() }}

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  87. WAIT?! ALL OF THAT?

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  88. Why validate
    on the client side?

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  89. Assure the data is good

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  90. Quick feedback

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  91. Real-time feedback

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  92. Reduce server validation

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  93. Now in the server side

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  94. View Slide

  95. Why validate
    on the server side?

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  96. Reassure the data is good

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  97. Server-side checking

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  98. Domain rules

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  99. 1
    2
    3
    4
    5
    6

    20
    function "'invoke(Request $request)
    {
    $request"(validate([
    'username' ") 'required|email',
    'password' ") 'required|min:6|strong_password',
    ]);
    ""$
    }

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  100. 1
    2
    3
    4
    5
    6
    7
    8
    9
    HTTP/1.1 422 Unprocessable Entity
    Content-Type: application/json; charset=utf-8
    ""$
    "data": {
    "errors": {
    "email": [
    "The email must be a valid email address."
    ],
    ""$

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  101. 1
    2
    3
    4
    5
    6
    7
    8
    9
    HTTP/1.1 422 Unprocessable Entity
    Content-Type: application/json; charset=utf-8
    ""$
    "data": {
    "errors": {
    "email": [
    "The email must be a valid email address."
    ],
    ""$

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  102. 1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    HTTP/1.1 422 Unprocessable Entity
    Content-Type: application/json; charset=utf-8
    ""$
    "data": {
    "errors": {
    "email": [
    "The email must be a valid email address."
    ],
    "password": [
    "The password must be at least 6 characters",
    "The password must have 2 uppercase letters 1 special letter 2 digi
    ]
    ""$

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  103. 1
    2

    8

    12
    13
    if (response.data.errors.email) {
    if (/required/i.test(response.data.errors)) {
    ""$
    } else if (/invalid/i.test(response.data.errors)) {
    ""$
    }
    }

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  104. How to simplify
    the conversation?

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  105. > art make:request SubmitRequest

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  106. 1
    2
    3
    4
    5
    6
    7
    public function rules()
    {
    return [
    'username' ") 'required|email',
    'password' ") 'required|min:6|strong_password',
    ];
    }

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  107. 1
    2
    3
    4
    5
    6
    7
    8
    9
    public function messages()
    {
    return [
    'required' ") ':attribute.required',
    'email' ") 'email.invalid',
    'password.min' ") 'password:min',
    'strong_password' ") 'password_not_strong',
    ];
    }

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  108. 1
    2
    3
    4
    5
    6
    7
    8
    9
    public function failedValidation(Validator $validator)
    {
    throw (new HttpResponseException(
    response()"(json([
    'message' ") 'The given data was invalid.',
    'errors' ") $validator"(errors()"(all(),
    ], 422)
    ));
    }

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  109. 1
    2
    3
    4
    5
    6
    7
    8
    9
    public function failedValidation(Validator $validator)
    {
    throw (new HttpResponseException(
    response()"(json([
    'message' ") 'The given data was invalid.',
    'errors' ") $validator"(errors()"(all(),
    ], 418)
    ));
    }

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  110. 1
    2
    3
    4
    5
    6
    7
    8
    9
    HTTP/1.1 418 I'm a teapot
    Content-Type: application/json; charset=utf-8
    ""$
    {
    "message": "The given data was invalid.",
    "errors": [
    "email.invalid"
    ]
    }

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  111. View Slide

  112. Validation examples

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  113. email fields

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  114. Simple form
    Email address
    SUBMIT
    The email field is required.

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  115. Simple form
    Email address
    SUBMIT
    The email must be a valid email address.
    example

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  116. 1
    2
    3
    4
    5
    6
    name="email"
    v-model="email"
    v—validate="'required|email'"
    type="text"
    "#

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  117. " prevent the errors

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  118. Simple form
    Email address
    SUBMIT
    Did you mean [email protected]?
    [email protected]

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  119. View Slide

  120. 1
    2
    3
    4
    5
    6
    7
    8
    9
    function "'invoke(Request $request)
    {
    $request"(validate([
    'email' ") [
    'required',
    'email',
    ]
    ]);
    }

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  121. 1
    2
    3
    4
    5
    6
    7
    8
    9
    function "'invoke(Request $request)
    {
    $request"(validate([
    'email' ") [
    'required',
    'email', "+ [email protected]
    ]
    ]);
    }

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  122. Simple form
    Email address
    SUBMIT
    [email protected]

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  123. 1
    2
    3
    4
    5
    6
    7
    8
    9
    function "'invoke(Request $request)
    {
    $request"(validate([
    'email' ") [
    'required',
    'email',
    ]
    ]);
    }

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  124. 1
    2
    3
    4
    5
    6
    7
    8
    9
    function "'invoke(Request $request)
    {
    $request"(validate([
    'email' ") [
    'required',
    'email:rfc,dns', "+ new in Laravel 5.8.33
    ]
    ]);
    }

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  125. 1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    function "'invoke(Request $request)
    {
    $request"(validate([
    'email' ") [
    'required',
    'email:rfc,dns',
    'unique:users.email',
    ]
    ]);
    }

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  126. 1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    function "'invoke(Request $request)
    {
    $request"(validate([
    'email' ") [
    'required',
    'email:rfc,dns', "+ ", ATTENTION
    'unique:users.email', "+ ", ATTENTION
    ]
    ]);
    }

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  127. 1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    function "'invoke(Request $request)
    {
    $request"(validate([
    'email' ") [
    'bail',
    'required',
    'email:rfc,dns',
    'unique:users.email',
    ]
    ]);
    }

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  128. Remember SubmitRequest?

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  129. 1
    2
    3
    4
    5
    6
    7
    8
    HTTP/1.1 418 I'm a teapot
    Content-Type: application/json; charset=utf-8
    ""$
    "data": {
    "errors": [
    "email.invalid",
    ]
    ""$

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  130. 1
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    this.$http.post('/submit’)
    .then(response ") {
    "+
    })
    .catch({ response } ") {
    "+
    })

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  131. 1

    5
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    9
    this.$http.post('/submit’)
    ""$
    .catch({ response } ") {
    if (response.status ""- 418) {
    "+
    }
    })

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  132. 1

    5
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    11
    this.$http.post('/submit’)
    ""$
    .catch({ response } ") {
    if (response.status ""- 418) {
    if (response.data.errors.includes('email.invalid')) {
    "+
    }
    }
    })

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  133. 1

    5
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    13
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    this.$http.post('/submit’)
    ""$
    .catch({ response } ") {
    if (response.status ""- 418) {
    let errors = response.data.errors
    if (response.data.errors.includes('email.invalid')) {
    this.$validator.errors.add({
    field: 'email',
    msg: 'The email must be a valid email address.',
    })
    }
    }
    })

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  134. 1

    5
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    13
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    this.$http.post('/submit’)
    ""$
    .catch({ response } ") {
    if (response.status ""- 418) {
    let errors = response.data.errors
    if (errors.includes('email.invalid')) {
    this.$validator.errors.add({
    field: 'email',
    msg: 'The email must be a valid email address.',
    })
    this.$el.username.focus()
    }
    }
    })

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  135. phone fields

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  136. 1
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    name="phone"
    v-model="phone"
    v-validate="'required'"
    type="text"
    "#

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  137. 1
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    name="phone"
    v-model="phone"
    v-validate="'required|phone'"
    type="text"
    "#

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  138. 1
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    8
    import { Validator } from 'vee-validate'
    const phone = {
    getMessage: field ") `The ${field} must be a valid phone number.`,
    validate: value ") {
    return /^[0-9]{9}$/.test(value)
    }
    }

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  139. 1
    2
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    7
    8
    import { Validator } from 'vee-validate'
    const phone = {
    getMessage: field ") `The ${field} must be a valid phone number.`,
    validate: value ") {
    return /^2[0-9]{8}|9[1236][0-9]{7}$/.test(value)
    }
    }

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  140. Simple form
    Mobile number
    SUBMIT
    The phone must be a valid phone number.
    201000123

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  141. " prevent the errors

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  142. Simple form
    Mobile number
    SUBMIT
    912367125637512123987

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  143. Simple form
    Mobile number
    SUBMIT
    asdasdasd

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  144. 1
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    name="phone"
    v-model="phone"
    v-validate="'required|phone'"
    type="text"
    "#

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  145. 1
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    name="phone"
    v-model="phone"
    v-validate="'required|phone'"
    type="text"
    maxlength="9"
    "#

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  146. > npm install vee-mask

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  147. 1
    2
    import Vue from 'vue'
    import VeeMask from 'vee-mask'

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  148. 1
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    3
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    import Vue from 'vue'
    import VeeMask from 'vee-mask'
    Vue.use(VeeMask)

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  149. 1
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    name="phone"
    v-model="phone"
    v-validate="'required|phone'"
    v-mask="'#########'"
    type="text"
    maxlength="9"
    "#

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  150. 1
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    8
    name="phone"
    v-model="phone"
    v-validate="'required|phone'"
    v-mask="'"". "". "".'"
    type="text"
    maxlength="11"
    "#

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  151. Simple form
    Mobile number
    SUBMIT
    213 123 123

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  152. zip, iban, address, weight…

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  153. They follow the same idea

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  154. WAX ON, WAX OFF

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  155. Extra tricks

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  156. autofocus

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  157. 1

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  158. 1

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  159. Sign up
    Full name
    Email address
    Phone
    CONTINUE
    |

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  160. " attention to mobile

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  161. Sign up
    Full name
    Email address
    Phone
    CONTINUE
    |
    Done
    Q W E R T Y U I O P
    space return
    123
    A S D F G H J K L

    ⇧ Z X C V B N M

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  162. 1

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  163. 1

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  164. 1
    2
    3
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    5
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    7
    8
    Vue.directive('autofocus', {
    inserted: (el, binding) ") {
    if (! isMobile) {
    el.setAttribute('autofocus', 'autofocus')
    el.focus() "+ Justin Case
    }
    },
    })

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  165. input types

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  166. 1

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  167. SUBMIT
    The Form
    Email field
    |
    Done
    Q W E R T Y U I O P
    space return
    123
    A S D F G H J K L

    ⇧ Z X C V B N M
    Done
    Q W E R T Y U I O P
    space return
    123
    A S D F G H J K L

    ⇧ Z X C V B N M
    @ .

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  168. 1

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  169. The Form
    Phone field
    SUBMIT
    |
    Done

    + ❋ #
    2
    1 3
    5
    4 6
    8
    7 9
    0
    ABC
    GHI JKL MNO
    DEF
    TUV
    PQRS WXYZ

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  170. 1

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  171. The Form
    Number field
    SUBMIT
    |
    Done
    1 2 3 4 5 6 7 8 9 0
    space return
    ABC

    #+= . , ? ! ´
    - / : ; ( ) $ & @ "

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  172. 1

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  173. 1

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  174. inputmode

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  175. 66 20 76 Nope
    Chrome Firefox Edge Safari
    Desktop
    Mobile / Tablet
    75 Nope 67 12.2-12.3
    Android Chrome Android Firefox Android iOS Safari

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  176. 1

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  177. 1
    2
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    name="field"
    type="text"
    inputmode="number"
    maxlength="9"
    "#

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  178. 1
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    name="field"
    type="text"
    inputmode="number" "+ tel, url, email, …
    maxlength="9"
    "#

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  179. 1
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    name="field"
    type="text"
    inputmode="decimal"
    maxlength="9"
    "#

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  180. The Form
    Decimal field
    SUBMIT
    |
    Done

    .
    2
    1 3
    5
    4 6
    8
    7 9
    0
    ABC
    GHI JKL MNO
    DEF
    TUV
    PQRS WXYZ

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  181. placeholder

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  182. 1
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    name="name"
    type="text"
    placeholder="Your Fullname"
    "#

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  183. REGISTER
    Sign up
    Your email
    Caneco

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  184. Prevent the Dory Syndrome

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  185. REGISTER
    Sign up
    Your email
    Caneco
    Your full name

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  186. REGISTER
    Sign up
    Your full name
    Your email
    Caneco
    The full name must be a valid name.
    Caneco2

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  187. REGISTER
    Sign up
    [email protected]
    Your full name
    Caneco
    Your email

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  188. Now you're ready

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  189. READY TO STRIKE

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  190. But first

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  191. VALIDATE FIRST
    VALIDATE BACK
    NO MERCY

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  192. Thank you

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  193. FORM validation
    #TheLaravelKid
    The Art of

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