Creating a Print Preview Web Component
This article details a <print-preview> web component designed for precise print control and preview, addressing a significant challenge in migrating a 1994-1996 VBA application to a modern web-based e-commerce platform. The original application's reliance on MS Access reports necessitated a robust solution for generating printable documents like packing slips and invoices in the new web environment.
The <print-preview> component offers several key features:
- WYSIWYG Print Preview: Accurately displays content as it will appear when printed.
- Comprehensive Customization: Allows fine-grained control over paper size, fonts, margins, and image handling (show, hide, or outline).
- Templating for Dynamic Content: Supports templates for generating dynamic documents like invoices, mirroring the functionality of MS Access reports.
- Internationalization (i18n): Easily adaptable to multiple languages.
Implementation:
The component is integrated into HTML as follows:
<print-preview><paper-sheet><h1>Hello, Printer!</h1><p>This will look great on paper.</p></paper-sheet></print-preview>
Each <paper-sheet> element represents a single page. Importantly, the component must be a direct child of the <body> element, and only one instance is permitted. The component is loaded via JavaScript:
import PrintPreview from './index.js';
And displayed using the preview() method:
const printPreview = document.querySelector('print-preview');
if (printPreview) printPreview.preview();Templating Example (Invoices):
Templates replace the functionality of Access reports:
const invoiceTemplate = (data) =>
data.map((obj) => {
// ... (Invoice data processing) ...
return `
<paper-sheet><h2>Invoice</h2>
<p> ... </p>
<table part="table"></table></paper-sheet>
`;
}).join('');Styling with CSS and ::part:
CSS and the ::part pseudo-element provide styling capabilities similar to a report designer:
print-preview {
&::part(table) {
border-collapse: collapse;
margin-block-start: 4rem;
width: 100%;
}
// ... (other styles) ...
}Direct styling within the template is also possible.
Image Handling:
The component allows control over image visibility in the print preview, offering options to show, hide, or display as outlines to conserve printer toner.
Localization:
The component's interface language is easily configurable using the i18n object:
PrintPreview.i18n = {
es: {
// ... (Spanish translations) ...
}
};Conclusion:
The <print-preview> component offers a powerful solution for managing print output in web applications, effectively replacing the report-generation capabilities of older systems. The author notes that the component is still under development and may receive updates and bug fixes. A demo and GitHub repository are available for further exploration.
Cover image by Wendelin Jacober: https://www.php.cn/link/86158a6b3924670a32dad65bbc41bd95
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