我在以下问题上陷入困境：
下面是壳体上的jsfiddle： https://jsfiddle.net/SanchezMalina/hno7v4tf/35/
或者代码在这里：
// regexp pattern functions
function validateEmail(email) {
let re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
return re.test(email.toLowerCase());
}
function validatePhone(phone) {
let re = /^[0-9]{7,20}$/;
return re.test(phone.toLowerCase());
}
function validateName(name) {
let re = /^([a-zA-Z0-9А]){3,50}$/;
return re.test(name.toLowerCase());
}
let flag = false;
// check required fields
function checkRequired() {
let notFilled = document.querySelectorAll('.is-required');
notFilled.forEach(function (el) {
if (el.value === '') {
el.parentElement.classList.add('is-empty');
addRequiredError();
} else {
el.parentElement.classList.remove('is-empty');
removeRequiredError();
}
});
}
let formFields = document.querySelectorAll('.form__field');
//add required error message
function addRequiredError() {
let errorRequiredMsg = document.createElement('div');
errorRequiredMsg.classList.add('input-required');
errorRequiredMsg.innerHTML = `<span> This field is required! </span>`;
formFields.forEach( function (elem) {
if (elem.classList.contains('is-empty')) {
elem.appendChild(errorRequiredMsg);
}
});
}
//remove required error message
function removeRequiredError() {
let requiredErrorMsg = document.querySelectorAll('.form__field .input-required');
requiredErrorMsg.forEach(function (elem) {
elem.parentElement.removeChild(elem);
});
flag = true;
}
//check validation inputs
function checkValid() {
let firstName = document.querySelector('#f-name');
let lastName = document.querySelector('#l-name');
let selectCountry = document.querySelector('.form__select');
let phone = document.querySelector('#cell');
let email = document.querySelector('#email');
formFields.forEach(function () {
if(!validateName(firstName.value) && !validateName(lastName.value) && !validatePhone(phone.value) && !validateEmail(email.value)) {
firstName.parentElement.classList.add('is-error');
lastName.parentElement.classList.add('is-error');
selectCountry.parentElement.classList.add('is-error');
phone.parentElement.classList.add('is-error');
email.parentElement.classList.add('is-error');
addValidError();
} else {
firstName.parentElement.classList.remove('is-error');
lastName.parentElement.classList.remove('is-error');
selectCountry.parentElement.classList.remove('is-error');
phone.parentElement.classList.remove('is-error');
email.parentElement.classList.remove('is-error');
removeValidError();
}
});
}
//add invalid error message
function addValidError() {
let errorValidMsg = document.createElement('div');
errorValidMsg.classList.add('input-error');
errorValidMsg.innerHTML = `<span> Input is invalid! </span>`;
formFields.forEach(function (elem) {
if (elem.classList.contains('is-error')) {
elem.appendChild(errorValidMsg);
}
});
// for (let i = 0; i < formFields.length; i++) {
//
// if (formFields[i].classList.contains('is-error')) {
//
// formFields[i].appendChild(errorValidMsg);
//
// }
// }
}
//remove invalid error message
function removeValidError() {
let requiredErrorMsg = document.querySelectorAll('.input-error');
requiredErrorMsg.forEach(function (elem) {
elem.parentNode.removeChild(elem);
})
}
//form submit handler
let formTrial = document.querySelector('.form__main');
formTrial.addEventListener('submit', function (event) {
event.preventDefault();
checkRequired();
console.log(flag);
if(flag !== false) {
checkValid();
}
});.form__main {
display: block;
margin: 25px auto;
width: 450px;
}
.form__field {
position: relative;
margin: 10px 0;
padding: 5px 15px;
background-color: #fff;
height: 50px;
}
.form__field_select::after {
content: "";
width: 0;
height: 0;
border: 7px solid transparent;
border-color: #000 transparent transparent transparent;
position: absolute;
top: 55%;
right: 17px;
transform: translateY(-50%);
}
.form__input {
position: absolute;
left: 0;
top: 10px;
right: 0;
bottom: 10px;
padding-left: 45px;
background: none;
font-size: 14px;
font-weight: 400;
font-family: "Open Sans", sans-serif;
width: 100%;
color: #333;
line-height: 1.714;
box-sizing: border-box;
}
.form__input:focus ~ .form__label,
.form__input:valid ~ .form__label {
top: 0;
left: 45px;
transform: scale(0.6, 0.6);
color: #000;
}
.form__input:focus ~ .form__label[for=cell],
.form__input:valid ~ .form__label[for=cell] {
top: 0;
left: 125px;
}
.form__input[type=tel] {
padding-left: 125px;
}
.form__input:-webkit-autofill {
-webkit-box-shadow: 0 0 0 100px white inset;
}
.form__label {
position: absolute;
top: 50%;
left: 50px;
transform-origin: left top;
transition: all 0.3s ease;
transform: translateY(-50%);
font-size: 14px;
font-family: "Open Sans", sans-serif;
color: #999999;
line-height: 1.714;
}
.form__label[for=cell] {
left: 135px;
}
.form__select {
position: absolute;
width: 100%;
height: 100%;
top: 50%;
transform: translateY(-50%);
left: 0;
right: 0;
padding-left: 50px;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
-webkit-appearance: none;
-moz-appearance: none;
background-color: transparent;
border-color: #fff;
font-size: 14px;
font-family: "Open Sans", sans-serif;
color: #000;
line-height: 1.714;
}
.form__country-code {
position: absolute;
color: #000;
left: 50px;
font-size: 14px;
font-family: "Open Sans", sans-serif;
line-height: 2;
height: 100%;
top: 0;
bottom: 0;
display: flex;
align-items: center;
border-right: 1px solid;
padding-right: 20px;
z-index: 2;
}
.form .btn {
width: 100%;
margin: 20px 0;
}
.form .btn:hover {
transform: translateY(-5px);
box-shadow: 1px 3px 20px #c5f833;
}<form method="post" class="form__main" novalidate>
<div class="form__field">
<i class="icon icon-user"></i>
<input class="form__input is-required" id="f-name" type="text" required>
<label class="form__label" for="f-name">First Name</label>
</div>
<div class="form__field">
<i class="icon icon-user"></i>
<input class="form__input is-required" id="l-name" type="text" required>
<label class="form__label" for="l-name">Last Name</label>
</div>
<div class="form__field">
<i class="icon icon-envelop"></i>
<input class="form__input" id="email" type="text" required>
<label class="form__label" for="email">Email</label>
</div>
<div class="form__field form__field_select">
<i class="icon icon-pin"></i>
<select class="form__select" name="country">
<option value="ro" selected>USA</option>
<option value="ua">India</option>
<option value="il">Spain</option>
</select>
</div>
<div class="form__field">
<i class="icon icon-phone"></i>
<span class="form__country-code">+10000</span>
<input class="form__input" id="cell" type="tel" required>
<label class="form__label" for="cell">Phone</label>
</div>
<button class="btn btn_lime">Try for free</button>
</form>
答案 0 :(得分：0)
1）
if( !el.parentElement.classList.contains('is-empty') ) {
addRequiredError();
}
2） 不知道要理解的问题
3）
function addValidError() {
let errorValidMsg = document.createElement('div');
errorValidMsg.classList.add('input-error');
errorValidMsg.innerHTML = '<span> Input is invalid! </span>';
formFields.forEach(function (elem) { // <-- here formFields is not defined
}