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Cash Register Skeleton
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Cash Register</title> | |
| <script> | |
| function calculateChange() { | |
| var purchase = document.getElementById('purchase'); | |
| var cash = document.getElementById('cash'); | |
| var change = document.getElementById('change'); | |
| var result = Number(cash.value) - Number(purchase.value); | |
| console.log(result); | |
| change.value = result; | |
| } | |
| function clearForm() { | |
| document.getElementById('purchase').value = ''; | |
| document.getElementById('cash').value = ''; | |
| document.getElementById('change').value = ''; | |
| } | |
| function isNumeric(n) { | |
| return !isNaN(parseFloat(n)) && isFinite(n); | |
| } | |
| function validateNumber(inputObj) { | |
| if (!isNumeric(inputObj.value)) { | |
| alert('Invalid input'); | |
| inputObj.value = ''; | |
| } | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <table> | |
| <tr> | |
| <td>Purchase</td> | |
| <td><input type="text" onblur="validateNumber(this)" id="purchase" /></td> | |
| </tr> | |
| <tr> | |
| <td>Cash</td> | |
| <td><input type="text" id="cash" /></td> | |
| </tr> | |
| <tr> | |
| <td>Change</td> | |
| <td><input type="text" id="change" /></td> | |
| </tr> | |
| <tr> | |
| <td colspan="2"> | |
| <button onclick="calculateChange()">Calculate</button> | |
| <button onclick="clearForm()">Clear</button> | |
| </td> | |
| </tr> | |
| </table> | |
| </body> | |
| </html> |
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