A program that I wrote in PHP which allows the user to give value in kilograms and pounds it will convert the given values to kilograms or pounds in vice versa.
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Program Listing
style.css
* {
box-sizing: border-box;
}
body {
font-family: Arial, Helvetica, sans-serif;
background: #2B2B2B;
color: #1a1a1a;
font-size: 15px;
}
main {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 500px;
box-shadow: rgba(99, 99, 99, 0.2) 0px 2px 8px 0px;
border-radius: 10px;
}
.container {
display: block;
padding: 30px;
background: #fff;
text-align: left;
border-radius: 10px;
}
.container-wrapper {
padding: 10px;
}
.container-wrapper:first-of-type {
margin-bottom: 10px;
}
h1, h2 {
text-align: center;
}
h1 {
margin: 10px 0 30px;
}
label {
width: 100%;
}
input,
select {
display: inline-block;
background: #f5f5f5;
width: 100%;
margin: 5px 0 20px 0;
padding: 15px;
border: none;
font-size: 15px;
}
input:focus,
select:focus {
background: #eeeeee;
outline: none;
}
.btnReset,
button {
background: #4594E4;
color: #fff;
padding: 15px;
margin: 0 0 20px;
border: none;
cursor: pointer;
width: 100%;
opacity: 0.9;
font-size: 15px;
outline: none;
border:0;
}
.btnWrapper {
display: inline-flex;
margin: 0;
width: 100%;
}
.btnWrapper input,
.btnWrapper .btnReset,
.btnWrapper .btnConvert {
padding: 15px;
border: none;
font-size: 15px;
margin: 0;
}
.btnWrapper input {
width: 100%;
}
.btnReset {
background: #2E4760;
}
.btnReset,
.btnConvert {
width: 100px;
text-align: center;
text-decoration: none;
}
.btnSelect {
background: #4EC4A2;
width: 100px;
}
.btnReset:hover,
button:hover {
opacity: 1;
}
.answer {
margin: 20px 0 0;
width: 100%;
padding: 20px;
text-align: center;
font-size: 30px;
font-weight: bold;
background: #dadada;
font-family: 'Times New Roman', serif;
line-height: 1.5;
}
.visibility_on {
display: block;
}
.visibility_off {
display: none;
}
.frmSelect {
display: flex;
flex-flow: row wrap;
align-items: center;
}
.frmSelect select {
vertical-align: middle;
padding: 15px;
margin: 5px 0 0;
width: calc(100% - 100px);
}
.frmSelect button {
margin: 5px 0 0;
}
.pieText {
font-family: Serif;
}
.blueText {
color:#2196f3;
}
index.php
<?php
$area = $html = $infotext = $sel1 = $sel2 = $sel3 = "";
$num1 = isset($_POST['txtNum1']) ? floatval($_POST['txtNum1']) : "";
$visibility = "visibility_off";
$selUnit = isset($_GET['txtSelectBox']) ? $_GET['txtSelectBox'] : '';
// Display selected shape input fields
if(isset($_GET['txtSelectBox'])) {
$visibility = "visibility_on";
switch ($selUnit) {
case "kg2lb":
$sel1 = "selected";
$html1 = '<h2>Kilograms → Pounds Converter</h2>';
$html2 = '<input type="number" name="txtNum1" id="txtNum1" placeholder="Input weight in kilograms (kg)" value="'.$num1.'" required>';
if(isset($_POST['btnConvert'])) {
$ans = round(($num1 * 2.20462262185), 4);
$infotext = '<div class="answer">'.$ans.' kg</div>';
}
break;
case "lb2kg":
$sel2 = "selected";
$html1 = '<h2>Pounds → Kilograms Converter</h2>';
$html2 = '<input type="number" name="txtNum1" id="txtNum1" placeholder="Input weight in pounds (lb)" value="'.$num1.'" required>';
if(isset($_POST['btnConvert'])) {
$ans = round(($num1 / 2.20462262185), 4);
$infotext = '<div class="answer">'.$ans.' lb</div>';
}
break;
}
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Weight Converter in PHP</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<main>
<div class="container">
<h1>Weight Converter in PHP</h1>
<h2>Jake R. Pomperada, MAED-IT,MIT</h2>
<div class="container-wrapper">
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="get" class="frmSelect">
<label for="txtSelectBox"><b>Choose the type of unit conversion:</b></label>
<select name="txtSelectBox" id="txtSelectBox" value="<?php echo $oper; ?>" required>
<option value="kg2lb" <?php echo $sel1; ?>>Kilograms → Pounds</option>
<option value="lb2kg" <?php echo $sel2; ?>>Pounds → Kilograms</option>
</select>
<button type="submit" class="btnSelect">Select</button>
</form>
</div>
<div class="container-wrapper <?php echo $visibility; ?>">
<form action="" method="post" class="frmAreaCalculate">
<?php echo $html1; ?>
<div class="btnWrapper">
<?php echo $html2; ?>
<a href="index.php" type="button" name="btnReset" class="btnReset">Reset</a>
<button type="submit" name="btnConvert" class="btnConvert">Convert</button>
</div>
<?php echo $infotext; ?>
</form>
</div>
</div>
</main>
</body>
</html>
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