My problem is I have a form let say where you input your name and surname and a button that triggers a bootstrap modal. On pressing this button, I want to display the data inputted in the previous form in my modal. Within the modal, the user can either close or submit the data that will be saved in a database.
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Answer
You can Leverage Bootstrap Modal Event.
If you post your code, then I could better answer it
$('#myModal').on('shown.bs.modal', function () {
//1- Get the value from form
var surname = $('#surname').val();
var surname = $('#surname').val();
//2- Set the value in Modal
})
Edited
<?php
session_start();
$_SESSION["userId"];
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<link rel="stylesheet" href="../css/global.css">
<link rel="stylesheet" href="../css/button$img.css">
<title>Calculate Health Score</title>
<link rel='icon' href='../img/favicon.ico' type='image/x-icon'/>
</head>
<body>
<div class="container">
<div class="col-md-12">
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a href="../index.php" class="navbar-brand">Mosanté</a>
<button class="navbar-toggler" data-toggle="collapse" data-target="#navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navigation">
<ul class="navbar-nav">
<li class="nav-item "><a href="profile.php" class="nav-link">Profile</a></li>
<li class="nav-item "><a href="../include/logout.inc.php" class="nav-link">Log Out</a></li>
</ul>
</div>
</nav>
<div class="d-flex justify-content-center align-items-center login-container">
<form id="myform" class="login-form text-center" action="../include/calcule_sante.php" method="post">
<h1 class="mb-5 font-weight-light text-uppercase">Calculate Health Score</h1>
<div class="form-group">
<label for="bPressure">Please insert your blood pressure</label>
<input type="number" name="bPressure" min = "0" id="bPressure" class="form-control rounded-pill form-control-lg" required>
</div>
<div class="form-group">
<label for="LDL">Please insert your LDL g/l</label>
<input type="number" name="LDL" step ="0.01" min = "0" id="LDL" class="form-control rounded-pill form-control-lg" required/>
</div>
<div class="form-group">
<label for="HDL">Please insert your HDL g/l</label>
<input type="number" name="HDL" step ="0.01" min = "0" id="HDL" class="form-control rounded-pill form-control-lg" required/>
</div>
<div class="form-group">
<label for="HbA1c">Please insert your HbA1c g/l</label>
<input type="number" name="HbA1c" step ="0.01" min = "0" id="HbA1c" class="form-control rounded-pill form-control-lg" required/>
</div>
<div class="form-group">
<label for="waist">Please insert your waist size cm</label>
<input type="number" name="waist" step = "0.01" min = "0" id="waist"class="form-control rounded-pill form-control-lg" required/>
</div>
<div class="form-group">
<label>Do you smoke?</label>
</div>
<div class="btn-group btn-group-toggle" data-toggle="buttons">
<label class="btn btn-primary ">Yes
<input type="radio" name="smoke" value="Yes" required/>
</label>
<label class="btn btn-primary active">
<input type="radio" name="smoke" value="No" required/>No
</label>
</div>
<button type="button" class="btn mt-5 mb-5 rounded-pill btn-lg btn-custom btn-block text-uppercase" data-toggle="modal" data-target="#myModal">Submit</button>
</form>
<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<div id="formPreview">
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button id="formSubmit" type="button" class="btn btn-primary">Submit</button>
</div>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
<script>
$('#myModal').on('shown.bs.modal', function () {
//1- Get the value from form
var table = '<table>'
$("#myform input").each(function(){
console.log($(this).attr('name'), $(this).val())
table += '<tr><td>'+$(this).attr('name')+'</td><td>'+$(this).val()+'</td></tr>'
})
table += '</table>'
//2- Set the value in Modal
$('#formPreview').html(table)
})
$('#formSubmit').on('click', function (){
$("#myform").submit();
})
</script>
</body>
</html>