阻止引导表单通过“ Enter”提交

Question

当用户按下输入上的ENTER键时，我不能阻止表单提交。我找到了this way，但是我有一些标记输入需要触发ENTER键以允许自由值。

这里是代码片段。

问：如何防止ENTER键提交表单而不破坏标签输入？

Q +：有人可以解释我为什么在我的$event.keyCode == 13函数中使用preventSubmitOnKey而为什么在我的undefined函数中使用submitForm吗？

$(document).ready(function() {
  // I can not use that
  //$('#myForm').on('keydown', preventSubmitOnKey);
  
	$('#myForm').on('submit', submitForm);
});

function preventSubmitOnKey($event) {
	console.log('key pressed!', $event.keyCode); // show 13 on 'ENTER'
	if ($event.keyCode == 13) {
		$event.preventDefault();
	}
}

function submitForm($event) {
	let invalidForm = false;
	$event.preventDefault(); // Don't refresh the page
  console.log('key', $event.charCode, $event.keyCode); // show 'undefined' ..
	let key = $event.charCode || $event.keyCode || 0;
	if (key == 13) {
		$event.stopPropagation();
		return;
	}

	const $form = $(this);

	$form.addClass('was-validated');

	if (!this.checkValidity()) {
		$event.stopPropagation();
		return;
	}

	// some other process...

	const data = {
		client: $form.find('#clientList').val(),
		firstname: $form.find('#contactFirstname').val(),
		lastname: $form.find('#contactLastname').val(),
	}

	console.log('Submitting', data);
	// call my own API
}

/**
 * up/down arrow devant les collapse
 */
[data-toggle="collapse"] .fas:before {  
  content: "\f139";
  margin-right: 5px;
}

[data-toggle="collapse"].collapsed .fas:before {
  content: "\f13a";
}

/**
 * Override Bootstrap CSS : ".btn" et "button"
 *	-> text-align: center;
 */
legend>[data-toggle="collapse"] {
	text-align: left;
	width: 100%;
}

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.0-1/css/all.min.css" integrity="sha256-4w9DunooKSr3MFXHXWyFER38WmPdm361bQS/2KUWZbU=" crossorigin="anonymous" />

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.bundle.min.js" integrity="sha384-6khuMg9gaYr5AxOqhkVIODVIvm9ynTT5J4V1cfthmT+emCG6yVmEZsRHdxlotUnm" crossorigin="anonymous"></script>


<form id="myForm" novalidate="novalidate">
	<fieldsed class="contactInfo">
		<legend>
			<button class="btn actilan-test" type="button" data-toggle="collapse" data-target="#contactCollapse" aria-expanded="true" aria-controls="contactCollapse"><i class="fas" aria-hidden="true"></i>Contact</button>
		</legend>
		<div class="collapse show" id="contactCollapse" data-parent="#myForm">
			<div class="input-group input-group-sm mb-1">
				<div class="input-group-prepend"><span class="input-group-text" id="clientListLabel">Client</span></div>
				<select class="custom-select" id="clientList" name="client" aria-describedby="clientListLabel">
					<option value="1">One</option>
					<option value="2" selected="selected">Two</option>
				</select>
				<div class="input-group-append">
					<button class="btn btn-secondary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" id="dropdownMenuButton">Mode</button>
					<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
						<button class="dropdown-item" type="button" id="btnAuto" disabled="disabled">Auto</button>
						<button class="dropdown-item" type="button" id="btnManuel">Manuel</button>
					</div>
				</div>
			</div>
			<div class="input-group input-group-sm mb-1">
				<div class="input-group-prepend"><span class="input-group-text" id="contactFullnameLabel">Nom et Prénom</span></div>
				<input class="form-control" type="text" id="contactFirstname" name="contactFirstname" aria-label="Contact firstname" aria-describedby="contactFullnameLabel" placeholder="Prénom" required="required">
				<input class="form-control" type="text" id="contactLastname" name="contactLastname" aria-label="Contact lastname" aria-describedby="contactFullnameLabel" placeholder="Nom" required="required">
				<div class="input-group-append">
					<button class="btn btn-danger" type="button" id="btnCancelContact"><i class="fas fa-user-minus"></i></button>
				</div>
				<div class="invalid-feedback">Ce champ doit contenir une valeur</div>
			</div>
		</div>
	</fieldsed>	
  <button class="btn btn-success mb-3" type="submit" id="btnSubmit" value="Submit!">Envoyer</button>
</form>