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Creating a Print Preview Web Component

DDDOriginal: 2025-01-24 20:35:09828browse

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:

<code class="language-html"><print-preview><paper-sheet><h1>Hello, Printer!</h1><p>This will look great on paper.</p></paper-sheet></print-preview></code>

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:

<code class="language-javascript">import PrintPreview from './index.js';</code>

And displayed using the preview() method:

<code class="language-javascript">const printPreview = document.querySelector('print-preview');
if (printPreview) printPreview.preview();</code>

Templating Example (Invoices):

Templates replace the functionality of Access reports:

<code class="language-javascript">const invoiceTemplate = (data) => 
  data.map((obj) => {
    // ... (Invoice data processing) ...
    return `
    <paper-sheet><h2>Invoice</h2>
      <p> ... </p>
      <table part="table"></table></paper-sheet>
    `;
  }).join('');</code>

Styling with CSS and ::part:

CSS and the ::part pseudo-element provide styling capabilities similar to a report designer:

<code class="language-css">print-preview {
  &::part(table) {
    border-collapse: collapse;
    margin-block-start: 4rem;
    width: 100%;
  }
  // ... (other styles) ...
}</code>

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:

<code class="language-javascript">PrintPreview.i18n = {
  es: {
    // ... (Spanish translations) ...
  }
};</code>

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.

Creating a Print Preview Web Component

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