130 lines
4.2 KiB
Markdown
130 lines
4.2 KiB
Markdown
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---
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title: Tip Calculator
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---
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## Tip Calculator
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A Tip Calculator is a calculator that calculates a tip based on the percentage of the total bill.
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## Step 1 - HTML:
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We create a form in order to enter the preferred amount:
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```html
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<!doctype html>
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<html lang="en">
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<head>
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<title>Tip Calculator</title>
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<!-- Required meta tags -->
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<!-- Bootstrap CSS -->
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
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</head>
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<body class="bg-dark">
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<div class="container">
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<div class="row">
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<div class="col-md-6 mx-auto">
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<div class="card card-body text-center mt-5">
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<h1 class="heading display-5 pb-3">Tip Calculator</h1>
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<form id="tip-form">
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<div class="form-group">
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<div class="input-group">
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<span class="input-group-addon">$</span>
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<input type="number" class="form-control" id="billTotal" placeholder="Total Bill">
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</div>
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</div>
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<div class="form-group tipPersent">
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<div class="input-group">
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<label for="">Tip:</label>
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<input type="range" class="form-control" id="tipInput" value="0">
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<span class="input-group-addon" id="tipOutput"></span>
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</div>
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</div>
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</form>
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<hr>
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<!-- RESULTS -->
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<div id="results" class="pt-4">
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<h5>Results</h5>
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<div class="form-group">
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<div class="input-group">
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<span class="input-group-addon">Tip amount</span>
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<input type="number" class="form-control" id="tipAmount" disabled>
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</div>
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</div>
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<div class="form-group">
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<div class="input-group">
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<span class="input-group-addon">Total Bill with Tip</span>
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<input type="number" class="form-control" id="totalBillWithTip" disabled>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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<!-- Optional JavaScript -->
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<!-- jQuery first, then Popper.js, then Bootstrap JS -->
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<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
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</body>
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</html>
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```
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## Step 2 - CSS:
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You design the style however you want. You can also use CSS to hide the results and show them through JavaScript after the user fills in the form:
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```css
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#results {
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display:none;
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}
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```
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## Step 3: JavaScript:
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We add onchange event. The onchange event occurs when user interacts with the form.
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This action will execute a function that computes the final bill amount based on the percentage tip, then returns the results.
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```javascript
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document.querySelector('#tip-form').onchange = function(){
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var bill = Number(document.getElementById('billTotal').value);
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var tip = document.getElementById('tipInput').value;
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document.getElementById('tipOutput').innerHTML = `${tip}%`;
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var tipValue = bill * (tip/100)
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var finalBill = bill + tipValue
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console.log(finalBill)
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var tipAmount = document.querySelector('#tipAmount')
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var totalBillWithTip = document.querySelector('#totalBillWithTip')
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tipAmount.value = tipValue.toFixed(2);
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totalBillWithTip.value =finalBill.toFixed(2);
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//Show Results
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document.getElementById('results').style.display='block'
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}
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```
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You can see a working example and its code on [Codepen.io](https://codepen.io/voula12/pen/djrZGw).
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