One-Click QR Code Printing: Instantly Generate and Print QR Codes with Just a Single Click
Posted: Fri Nov 08, 2024 3:41 am
### Task: **Automatic QR Code Printing from Websites**
**Description:**
There are three websites containing links that lead to pages with QR codes. These links open pages or scripts that generate and display a QR code (not a direct link to the image, but a page or script that renders the image).
The current printing process consists of the following steps:
1. The user clicks the link.
2. A new tab opens with the QR code.
3. The user then presses **Ctrl + P** to print the QR code.
4. Presses **Enter** to confirm the print.
5. Closes the window with the QR code.
**Task:**
The goal is to modify this process so that by clicking a link, the user can:
- Automatically initiate the printing process without opening a new tab or window.
- Avoid having to manually press **Ctrl + P** and **Enter**.
**Technical Requirements:**
1. A script should be implemented on the pages with links to immediately trigger the QR code printing after the user clicks the link.
2. The solution should work without reloading the page and without opening additional windows or tabs.
3. The solution should use HTML, JavaScript, or other available technologies.
**Solution:**
1. Use JavaScript to automatically invoke the print function on the QR code page.
2. Example client-side implementation:
- When the link is clicked, a script is loaded that generates the QR code and automatically triggers the print function.
- This can be done using `window.print()` inside the `click` event handler for the link.
Example Code:
```html
```
**Explanation:**
- In this example, clicking the link opens a window that loads the script for generating the QR code.
- Once the script loads, `window.print()` is automatically called to start the printing process.
- After printing is completed, the window is closed.
**Description:**
There are three websites containing links that lead to pages with QR codes. These links open pages or scripts that generate and display a QR code (not a direct link to the image, but a page or script that renders the image).
The current printing process consists of the following steps:
1. The user clicks the link.
2. A new tab opens with the QR code.
3. The user then presses **Ctrl + P** to print the QR code.
4. Presses **Enter** to confirm the print.
5. Closes the window with the QR code.
**Task:**
The goal is to modify this process so that by clicking a link, the user can:
- Automatically initiate the printing process without opening a new tab or window.
- Avoid having to manually press **Ctrl + P** and **Enter**.
**Technical Requirements:**
1. A script should be implemented on the pages with links to immediately trigger the QR code printing after the user clicks the link.
2. The solution should work without reloading the page and without opening additional windows or tabs.
3. The solution should use HTML, JavaScript, or other available technologies.
**Solution:**
1. Use JavaScript to automatically invoke the print function on the QR code page.
2. Example client-side implementation:
- When the link is clicked, a script is loaded that generates the QR code and automatically triggers the print function.
- This can be done using `window.print()` inside the `click` event handler for the link.
Example Code:
```html
Code: Select all
<!DOCTYPE html>
<html>
<head>
<title>QR Code Print</title>
<script type="text/javascript">
function printQRCode(url) {
var printWindow = window.open(url, '_blank');
printWindow.onload = function() {
printWindow.print();
printWindow.onafterprint = function() {
printWindow.close();
};
};
}
</script>
</head>
<body>
<a href="javascript:void(0);" onclick="printQRCode('QR_Code_Generator_Script_URL')">Print QR Code</a>
</body>
</html>**Explanation:**
- In this example, clicking the link opens a window that loads the script for generating the QR code.
- Once the script loads, `window.print()` is automatically called to start the printing process.
- After printing is completed, the window is closed.