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Capgo

Getting Started

このコンテンツはまだあなたの言語で利用できません。

  1. Install the package

    Terminal window
    npm i @capgo/capacitor-printer

  2. Sync with native projects

    Terminal window
    npx cap sync

Usage

Import the plugin and print various types of content:

import { Printer } from '@capgo/capacitor-printer';


// Print HTML content
const printHTML = async () => {
  await Printer.print({
    content: '<h1>Hello World</h1><p>This is a test print.</p>',
    name: 'test-print'
  });
};


// Print a PDF file
const printPDF = async () => {
  await Printer.print({
    content: 'file:///path/to/document.pdf',
    name: 'my-document'
  });
};


// Print an image
const printImage = async () => {
  await Printer.print({
    content: 'file:///path/to/image.jpg',
    name: 'my-image'
  });
};

API Reference

print(options)

Opens the native print dialog with the specified content.

interface PrintOptions {
  content: string;          // HTML string, file URI, or base64 data
  name?: string;            // Print job name
  orientation?: 'portrait' | 'landscape';
  grayscale?: boolean;      // Print in grayscale (default: false)
}


await Printer.print(options);

canPrint()

Checks if printing is available on the device.

const { value } = await Printer.canPrint();
console.log('Printing available:', value);

Complete Example

import { Printer } from '@capgo/capacitor-printer';
import { Filesystem, Directory } from '@capacitor/filesystem';


export class PrintService {
  async checkPrintAvailability(): Promise<boolean> {
    const { value } = await Printer.canPrint();
    return value;
  }


  async printHTML(htmlContent: string, jobName: string = 'Document') {
    try {
      const canPrint = await this.checkPrintAvailability();
      if (!canPrint) {
        throw new Error('Printing not available on this device');
      }


      await Printer.print({
        content: htmlContent,
        name: jobName,
        orientation: 'portrait'
      });
    } catch (error) {
      console.error('Print failed:', error);
      throw error;
    }
  }


  async printDocument(filePath: string, jobName?: string) {
    await Printer.print({
      content: filePath,
      name: jobName || 'Document'
    });
  }


  async printReceipt(receiptData: any) {
    const html = `
      <!DOCTYPE html>
      <html>
        <head>
          <style>
            body { font-family: Arial, sans-serif; padding: 20px; }
            .header { text-align: center; margin-bottom: 20px; }
            .item { display: flex; justify-content: space-between; margin: 10px 0; }
            .total { font-weight: bold; font-size: 1.2em; margin-top: 20px; padding-top: 10px; border-top: 2px solid #000; }
          </style>
        </head>
        <body>
          <div class="header">
            <h2>Receipt</h2>
            <p>Date: ${new Date().toLocaleDateString()}</p>
          </div>
          ${receiptData.items.map((item: any) => `
            <div class="item">
              <span>${item.name}</span>
              <span>$${item.price.toFixed(2)}</span>
            </div>
          `).join('')}
          <div class="total">
            <div class="item">
              <span>Total:</span>
              <span>$${receiptData.total.toFixed(2)}</span>
            </div>
          </div>
        </body>
      </html>
    `;


    await this.printHTML(html, 'Receipt');
  }


  async printFromURL(url: string) {
    // Download the file first
    const response = await fetch(url);
    const blob = await response.blob();
    const reader = new FileReader();


    return new Promise((resolve, reject) => {
      reader.onloadend = async () => {
        try {
          await Printer.print({
            content: reader.result as string,
            name: 'Downloaded Document'
          });
          resolve(true);
        } catch (error) {
          reject(error);
        }
      };
      reader.onerror = reject;
      reader.readAsDataURL(blob);
    });
  }
}

Advanced Usage

Printing with Custom Styling

const printStyledDocument = async () => {
  const html = `
    <!DOCTYPE html>
    <html>
      <head>
        <style>
          @page {
            size: A4;
            margin: 2cm;
          }
          body {
            font-family: 'Times New Roman', serif;
            line-height: 1.6;
          }
          h1 {
            color: #333;
            border-bottom: 2px solid #333;
            padding-bottom: 10px;
          }
          .content {
            margin-top: 20px;
          }
        </style>
      </head>
      <body>
        <h1>Professional Document</h1>
        <div class="content">
          <p>This is a professionally styled document ready for printing.</p>
        </div>
      </body>
    </html>
  `;


  await Printer.print({
    content: html,
    name: 'Styled Document',
    orientation: 'portrait'
  });
};

Printing Tables

const printTable = async (data: any[]) => {
  const tableRows = data.map(row => `
    <tr>
      <td>${row.id}</td>
      <td>${row.name}</td>
      <td>${row.value}</td>
    </tr>
  `).join('');


  const html = `
    <!DOCTYPE html>
    <html>
      <head>
        <style>
          table {
            width: 100%;
            border-collapse: collapse;
          }
          th, td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: left;
          }
          th {
            background-color: #f2f2f2;
            font-weight: bold;
          }
        </style>
      </head>
      <body>
        <table>
          <thead>
            <tr>
              <th>ID</th>
              <th>Name</th>
              <th>Value</th>
            </tr>
          </thead>
          <tbody>
            ${tableRows}
          </tbody>
        </table>
      </body>
    </html>
  `;


  await Printer.print({
    content: html,
    name: 'Data Table'
  });
};

Printing Images

const printImageWithDetails = async (imagePath: string, title: string) => {
  const html = `
    <!DOCTYPE html>
    <html>
      <head>
        <style>
          body { text-align: center; padding: 20px; }
          h2 { margin-bottom: 20px; }
          img { max-width: 100%; height: auto; }
        </style>
      </head>
      <body>
        <h2>${title}</h2>
        <img src="${imagePath}" alt="${title}" />
      </body>
    </html>
  `;


  await Printer.print({
    content: html,
    name: title
  });
};

Best Practices

  1. Check Availability: Always check if printing is available before attempting to print
  2. Valid Content: Ensure HTML is well-formed and file paths are valid
  3. Job Names: Use descriptive names for print jobs to help users identify them
  4. Styling: Use inline CSS or embedded styles for consistent print output
  5. Error Handling: Wrap print calls in try-catch blocks for user feedback

Troubleshooting

Common Issues

Print dialog not appearing: Check that printing is available with canPrint() Content not printing: Verify that HTML is valid and file paths are correct Images not showing: Ensure image paths are absolute and files are accessible Styling issues: Use @page CSS rules and test print output