🎨 form-validator

41479 ワード
実習 テキストリンク

🪐 logic

  • html内を構成するために必要なform(label-input-smallキットをdivに組み合わせる)
  • error関数/success関数の生成
  • 各形式の検証を設定する
  • (1)(validation)ユーザ名が10文字未満(length)
  • (2)(validation)emailは@となります.com
  • (3)(validation)pw 8文字未満15文字(length)
  • (4)(validation)pw 1とpw 2が一致しているかどうか(length)
  • (5)(validation)値が存在しない場合
  • フォームを提出(クリック)する時、応用完全検証応用イベント
    「コミット」ボタンを押すとvalidatorが有効であればsuccess関数(またはerror関数)を実行し、
    🚀 html

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <link href="index.css" rel="stylesheet" />
        <title>form-validator</title>
    </head>
    <body>
        <div class="container">
            <form id="form">
                <h1>Sign Up our website</h1>

                <div class="form-control">
                    <label for="username">User Name</label>
                    <input id="username" type="text" placeholder="Enter username" />
                    <small>Error message</small>
                </div>

                <div class="form-control">
                    <label for="email">Email</label>
                    <input id="email" type="text" placeholder="Enter email" />
                    <small>Error message</small>
                </div>

                <div class="form-control">
                    <label for="password">Password</label>
                    <input id="password" type="password" placeholder="Enter password" />
                    <small>Error message</small>
                </div>

                <div class="form-control">
                    <label for="password2">Password Check</label>
                    <input id="password2" type="password" placeholder="Confirm password" />
                    <small>Error message</small>
                </div>
                <button id="submit">Submit</button>
            </form>

            <script src="index.js"></script>
        </div>
    </body>
</html>
    🚀 css

@import url("reset.css");

* {
    box-sizing: border-box;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    background-color: cadetblue;
}

#form {
    padding: 30px;
    max-width: 500px;
    max-height: 800px;
    background-color: #fafafa;
    border: 1px solid tan;
    border-radius: 5px;
    text-align: center;
}

h1 {
    padding-bottom: 10px;
    color: teal;
    background-color: #fafafa;
    font-size: 30px;
    font-weight: 900;
    text-align: center;
}

/* form 구성 */
.form-control {
    display: flex;
    flex-direction: column;
    padding: 10px 0;
    background-color: #fafafa;
}

small {
    visibility: hidden;  /* small의 defalult는 안보이도록 한다(js를 통해 visible하게 설정 */
    text-align: left;
    font-size: small;
    color: red;
}

.form-control.error small {
    visibility: visible;
}

/* input 에 error 및 succecc 적용하는 css */
.form-control.success input {
    border-color: green;
}

.form-control.error input {
    border-color: red;
}

label {
    padding: 10px 0;
    font-weight: 700;
    text-align: left;
}

input {
    width: 100%;
    padding: 5px 0 5px 10px;
    cursor: text;
}

#submit {
    margin: 10px;
    padding: 5px 10px;
    color: #fafafa;
    background-color: teal;
    border: 1px solid teal;
    border-radius: 5px;
    cursor: pointer;
}
    🚀 js

"use strict";

const userName = document.getElementById("username");
const email = document.getElementById("email");
const pw1 = document.getElementById("password");
const pw2 = document.getElementById("password2");
const form = document.getElementById("form");

// error 표시 구현 기능(error 메시지 포함)
function showError(input, message) {
    // input.parentElement = form-control
    const formControl = input.parentElement;
    formControl.className = "form-control error";

    const small = formControl.querySelector("small"); // 지역변수로 선언해줘야 한다
    small.innerText = message;
}

// success 표시 구현 기능
function showSuccess(input) {
    const formControl = input.parentElement;
    formControl.className = "form-control success";
}

// label의 첫 글자를 대문자로 변환
function idName(input) {
    return input.id.charAt(0).toUpperCase() + input.id.slice(1);
}

// (validation) input 값 길이(length) 유효성 검사 (username && password)
function checkLength(input, min, max) {
    if (input.value.length < min) {
        showError(input, `${idName(input)} must be at least ${min} characters`);
    } else if (input.value.length > max) {
        showError(input, `${idName(input)} must be less than ${max} characters`);
    } else {
        showSuccess(input);
    }
}

// (validation) email 유효성 검사
function checkEmail(input) {
    if (input.value.trim() && input.value.includes("@")) {
        showSuccess(input);
    } else {
        showError(input, `${idName(input)} is not valid`);
    }
}

// (validation) Check passwords match
function checkPasswordsMatch(input1, input2) {
    if (input1.value !== input2.value) {
        showError(input2, "Passwords do not match");
    }
}

// 값이 없을 때
function checkRequired(inputArr) {
    // 모든 input값에 다 해당하므로 배열 형태로 매개변수 넣어줌
    let isRequired = false;
    inputArr.forEach(function (input) {
        if (input.value.length < 0) {
            //값이 없으면
            showError(input, `${idName(input)} is required`);
            isRequired = true;
        } else {
            showSuccess(input);
        }
    });

    return isRequired;
}

// 위의 함수들을 실행시켜줄 addEventListner 걸어주기 (form 에 걸어주기)
form.addEventListener("submit", function (e) {
    e.preventDefault(); // 유효성 검사가 실행되기도 전에, submit 되는 것을 막아줌

    if (!checkRequired([userName, email, pw1, pw2])) {
        // value가 존재한다면
        checkLength(userName, 3, 15);
        checkLength(pw1, 6, 25);
        checkEmail(email);
        checkPasswordsMatch(pw1, pw2);
    }
});
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