Причина, по которой он не работает, заключается в том, что вы не обертываете свою метку и не вводите в form-group div
Проверка изменила способ, которым она была раньше для bootstrap - что означает is-valid и i s invalid не знает, где искать, поэтому, когда его нет в обертке div группы форм, он применяет сообщение is-invalid ко всем совпадающим divs.
Я добавил label, чтобы это приятно вместо использования только электронной почты: <input>
Если вы отправите форму сейчас без каких-либо значений, она отобразит ошибки _ ошибка исчезнет, как только вы введете в поле ввода.
Запустите фрагмент ниже, чтобы увидеть, как он работает.
/**
* AJAX Post script
*/
const ERROR_TYPE_FATALERROR = 1;
const ERROR_TYPE_INPUTERROR = 2;
const ERROR_TYPE_GLOBALMESSAGE = 3;
// Run through the validate() function ONLY once the form as been submitted once!
// Otherwise, user will get validation right away as he types! Just a visual thing ...
var formSubmittedOnce = false;
/**
* submitFormData()
* Serialize and post form data with an AJAX call
*
* Example: onClick="submitFormData('frm1',['username','email'])"
*
* @param string formid essentially the 'id' of the container holding all form elements (i.e. <tr id="rowfrm_1">, <form id='frm1'>, etc.)
* @param array fields list of field names that may produce input errors (i.e. ['username','email'] )
*/
function submitFormData(formid, fields) {
// flag form was submitted once!
formSubmittedOnce = true;
// ----------------------------------
// first rehide all error containers
// ----------------------------------
$('#fatalError').removeClass('d-block');
$('#fatalErrorID').removeClass('d-block');
$('#fatalErrorTrace').removeClass('d-block');
$('#fatalErrorGoBack').removeClass('d-block');
$('#globalMessage').removeClass('d-block');
$('#globalMessageID').removeClass('d-block');
$('#globalMessageTrace').removeClass('d-block');
$('#globalMessageFooter').removeClass('d-block');
$('#globalMessageMailLink').removeClass('d-block');
$('#globalMessageGoBackLink').removeClass('d-block');
// rehide error containers of all inputs that might produce errors
if (fields != null) {
for (const f of fields) {
$('#' + f + '_inputError').removeClass('d-block');
}
}
// ----------------------------------
// loop form elements and validate required fields
// ----------------------------------
var formNode = $("#" + formid);
var formInputs = formNode.find("select, textarea, input");
var submit = true;
for (var i = 0; i < formInputs.length; ++i) {
var input = formInputs[i];
// validate fields
if (validate(input) === false) {
submit = false;
}
}
if (submit === true) {
// ----------------------------------
// get form data and serialize it!
// ----------------------------------
// formid comes from a <form>. just serialize it
if (formNode.prop("tagName") === "FORM") {
var formData = formNode.serialize();
}
// formid doesn't come from a <form>
else {
// get all form control
var myInputs = formNode.clone();
// bug with clone() and SELECT controls: it'll only get the value of the option having the 'selected' attribute (the default value)
// this hack will change the value clone() got to the actual user selected value, and not the default set value!
formNode.find('select').each(function(i) {
myInputs.find('select').eq(i).val($(this).val());
})
// create a dummy form, append all inputs to it and serialize it.
var formData = $('<form>').append(myInputs).serialize();
}
// ----------------------------------
// POST !
// ----------------------------------
$.ajax({
type: 'POST',
url: $(location).attr('href'),
data: formData,
dataType: "json",
}).done(function(response) {
// get response
if (response) {
// if we got success, redirect if we got a redirect url!
if (response.success != null) {
if (typeof response.success === "string") {
window.location.replace(response.success);
}
}
// if anything else, PHP returned some errors or a message to display (i.e. 'data saved!')
else {
showMessages(response);
}
}
// Successful post, but no response came back !?
// assume success, since no 'success' response came back, thus keeping same page as is
else {
console.warn("Post sent, but no response came back!? Assuming successful post...");
}
}).fail(function(xhr, status, error) { // we get here if we don't have a proper response/json sent!
console.error("Ajax failed: " + xhr.statusText);
console.error(status);
console.error(error);
var ajaxError = {
'type': ERROR_TYPE_FATALERROR,
'message': '<strong>Ajax failure!</strong><br/><br/>' + status + '<br/><br/>' + error,
'trace': null,
'id': null,
'goback': null,
'adminMailtoLnk': 'mailto:' + 'ravenlost2@gmail.com'
};
showMessages(ajaxError);
});
}
}
/**
* showMessages()
* show error messages in page based on JSON response
* @param response JSON object holding response with (error) messages to display
*/
function showMessages(response) {
// error type
switch (response.type) {
// ----------------------------
// GLOBAL MESSAGE
// ----------------------------
case ERROR_TYPE_GLOBALMESSAGE:
$('#globalMessage').addClass('d-block');
// set global message header message type
$('#globalMessage').removeClass("error warning info");
$('#globalMessage').addClass(response.gmType);
$('#globalMessageIcon').removeClass("fa-exclamation-triangle fa-info-circle");
$('#globalMessageIcon').addClass(response.gmIcon);
$('#globalMessageTitle').empty();
$('#globalMessageTitle').append(response.gmTitle);
// set message
$('#globalMessagePH').empty();
$('#globalMessagePH').append(response.message);
// set uniq error id
if (response.id != null) {
$('#globalMessageID').addClass('d-block');
$('#globalMessageIDPH').empty();
$('#globalMessageIDPH').append(response.id);
}
// set stacktrace
if (response.trace != null) {
$('#globalMessageTrace').addClass('d-block');
$('#globalMessageTracePH').empty();
$('#globalMessageTracePH').append(response.trace);
}
// set footer
if ((response.showContactAdmin == true) || (response.goback != null)) {
$('#globalMessageFooter').addClass('d-block');
// contact admin
if (response.showContactAdmin == true) {
$('#globalMessageMailLink').addClass('d-block');
$('#globalMessageMailLinkPH').attr('href', response.adminMailtoLnk);
}
// go back
if (response.goback != null) {
$('#globalMessageGoBackLink').addClass('d-block');
$('#globalMessageGoBackLinkPH').attr('href', response.goback);
}
}
break;
// ----------------------------
// FATAL ERROR
// ----------------------------
case ERROR_TYPE_FATALERROR:
// hide content if we got a fatal as to prevent user from fiddling around and not reading the message!
$('#content').addClass('d-none');
$('#fatalError').addClass('d-block');
// set message
$('#fatalErrorMessagePH').empty();
$('#fatalErrorMessagePH').append(response.message);
// reset mailto link
$('#fatalErrorMailLink').attr('href', response.adminMailtoLnk);
// set stacktrace
if (response.trace != null) {
$('#fatalErrorTrace').addClass('d-block');
$('#fatalErrorTracePH').empty();
$('#fatalErrorTracePH').append(response.trace);
}
// set uniq error id
if (response.id != null) {
$('#fatalErrorID').addClass('d-block');
$('#fatalErrorIDPH').empty();
$('#fatalErrorIDPH').append(response.id);
}
// set 'go back' url
if (response.goback != null) {
$('#fatalErrorGoBack').addClass('d-block');
$('#fatalErrorGoBackLink').attr('href', response.goback);
}
break;
// ----------------------------
// INPUT ERROR
// ----------------------------
case ERROR_TYPE_INPUTERROR:
for (var field in response.fields) {
var msg = eval('response.fields.' + field);
$('#' + field + '_inputError').addClass('d-block')
$('#' + field + '_inputError_message').empty();
$('#' + field + '_inputError_message').append(msg);
}
break;
default:
console.error('Got an invalid error type from the response!');
}
}
/**
* validate()
* Validate if field is empty or not
* @param input form element
* @return boolean
*/
function validate(input) {
if (formSubmittedOnce === true) {
if (input.hasAttribute('required')) {
if (input.value.trim() == '') {
input.classList.remove('is-valid');
input.classList.add('is-invalid');
return false;
} else {
input.classList.remove('is-invalid');
input.classList.add('is-valid');
return true;
}
} else {
// if we get here, then any other inputs not marked as 'required' are valid
input.classList.add('is-valid');
}
}
}
<html>
<head>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<!-- Popper JS -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script>
</head>
<body>
<form id="testfrm" class="form-group">
<div class="form-group">
<label class="form-control-label" for="username_required">Username</label>
<input type="text" name="username" aria-describedby="username_required username_inputError" class="form-control is-invalid" oninput="validate(this)" required/><br>
<div id="username_required" class="pl-1 invalid-feedback">
This field is required!
</div>
<!-- if bad username format or already taken, print form input error -->
<div id="username_inputError" class="col alert alert-danger alert-dismissible fade show mt-2 py-2 pl-3 pr-5 text-left d-none">
<small>
<strong>Error!</strong> <span id="username_inputError_message"></span>
<button type="button" aria-label="Close" class="close pt-1 pr-2" onclick="$('#username_inputError').removeClass('d-block').addClass('d-none');">×</button>
</small>
</div>
<div class="form-group">
<label class="form-control-label" for="email_required">Email</label>
<input type="text" name="email" aria-describedby="email_required email_inputError" class="form-control is-valid" oninput="validate(this)" required/><br>
<div id="email_required" class="pl-1 invalid-feedback">
This field is required!
</div>
</div>
<!-- if bad email format or already taken, print form input error -->
<div id="email_inputError" class="col alert alert-danger alert-dismissible fade show mt-2 py-2 pl-3 pr-5 text-left d-none">
<small>
<strong>Error!</strong> <span id="email_inputError_message"></span>
<button type="button" aria-label="Close" class="close pt-1 pr-2" onclick="$('#email_inputError').removeClass('d-block').addClass('d-none');">×</button>
</small>
</div>
Comment: <input type="text" name="comment" class="form-control is-valid"><br>
<input type="button" value="Submit" onclick="submitFormData('testfrm',['username','email'])" class="is-valid">
</form>
</body>
</html>