Testing

[ygpta]

Yes, you can use html2canvas and jsPDF to export a React component as a PDF, including the content that's not visible on the screen due to scrolling. Below is a step-by-step guide to implement this.

Step 1: Install Required Libraries

You need to install html2canvas and jspdf:

npm install html2canvas jspdf

Step 2: Create a Component with Sticky Header/Footer and Scrollable Body

You can structure your table as you normally would. Here's a basic example:

import React, { useRef } from 'react';
import html2canvas from 'html2canvas';
import jsPDF from 'jspdf';

const MyComponent = () => {
    const componentRef = useRef();

    const handlePrint = () => {
        const input = componentRef.current;

        html2canvas(input, {
            scrollX: 0,
            scrollY: -window.scrollY, // This helps with capturing fixed/sticky elements correctly
            useCORS: true,  // This handles images from external sources
        }).then((canvas) => {
            const imgData = canvas.toDataURL('image/png');
            const pdf = new jsPDF('p', 'mm', 'a4');
            const imgWidth = 210; // A4 width in mm
            const pageHeight = 295; // A4 height in mm
            const imgHeight = (canvas.height * imgWidth) / canvas.width;
            let heightLeft = imgHeight;
            let position = 0;

            pdf.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);
            heightLeft -= pageHeight;

            while (heightLeft >= 0) {
                position = heightLeft - imgHeight;
                pdf.addPage();
                pdf.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);
                heightLeft -= pageHeight;
            }

            pdf.save('exported-component.pdf');
        });
    };

    const data = Array.from({ length: 100 }, (_, i) => `Row ${i + 1}`);

    return (
        <div>
            <button onClick={handlePrint}>Export as PDF</button>
            <div ref={componentRef} style={{ padding: '20px', border: '1px solid #000' }}>
                <h1>My Report</h1>
                <div style={{ height: '500px', overflow: 'auto' }}>
                    <table style={{ width: '100%', borderCollapse: 'collapse' }}>
                        <thead style={{ position: 'sticky', top: 0, backgroundColor: '#fff' }}>
                            <tr>
                                <th style={{ border: '1px solid black' }}>Header 1</th>
                                <th style={{ border: '1px solid black' }}>Header 2</th>
                                <th style={{ border: '1px solid black' }}>Header 3</th>
                            </tr>
                        </thead>
                        <tbody>
                            {data.map((item, index) => (
                                <tr key={index}>
                                    <td style={{ border: '1px solid black' }}>{item}</td>
                                    <td style={{ border: '1px solid black' }}>Data 2</td>
                                    <td style={{ border: '1px solid black' }}>Data 3</td>
                                </tr>
                            ))}
                        </tbody>
                        <tfoot style={{ position: 'sticky', bottom: 0, backgroundColor: '#fff' }}>
                            <tr>
                                <td style={{ border: '1px solid black' }}>Footer 1</td>
                                <td style={{ border: '1px solid black' }}>Footer 2</td>
                                <td style={{ border: '1px solid black' }}>Footer 3</td>
                            </tr>
                        </tfoot>
                    </table>
                </div>
            </div>
        </div>
    );
};

export default MyComponent;

Step 3: Explanation of Key Parts

1. Capturing the Component with html2canvas:

   • The html2canvas library captures the content of a DOM element and converts it to a canvas.
   • scrollX: 0 and scrollY: -window.scrollY help ensure sticky/fixed elements are captured properly.
   • useCORS: true is helpful when you have external images that need to be rendered in the canvas.

2. Generating the PDF with jsPDF:

   • jsPDF is used to convert the captured canvas image to a PDF.
   • imgWidth and pageHeight correspond to the dimensions of an A4 page.
   • The loop ensures that if the captured content is taller than one page, it adds additional pages to the PDF.

3. Handling the Sticky Table:

   • The table's header and footer are sticky, ensuring they remain in place during scrolling.
   • The code ensures that all rows, even those not visible in the scrollable container, are included in the PDF.

Step 4: Save the PDF

The PDF will be saved as exported-component.pdf in the user's downloads folder when the button is clicked.

This approach will export the entire content of your component, including the non-visible parts of your table, to a single PDF document.