Angular 2 how to display .pdf file

Angular 2 how to display .pdf file

To display a PDF file in an Angular 2+ application, you have a couple of options depending on your requirements. Here are two common approaches:

Approach 1: Using <embed> or <object> Tag

You can embed a PDF file directly into your Angular component template using the <embed> or <object> tag. This approach is straightforward and uses the browser's built-in PDF viewer.

  1. Component Template (HTML):

    <embed src="path/to/your/file.pdf" type="application/pdf" width="100%" height="600px" />

    or

    <object data="path/to/your/file.pdf" type="application/pdf" width="100%" height="600px"> <p>Alternative text - include a link to download the PDF instead.</p> </object>

    Replace "path/to/your/file.pdf" with the actual path to your PDF file.

  2. Explanation:

    • <embed> Tag: Directly embeds the PDF file into the HTML document. It uses the browser's default PDF viewer.
    • <object> Tag: Similar to <embed>, but provides a fallback content in case the browser doesn't support displaying PDFs.

Approach 2: Using PDF.js Library

If you need more control over the rendering of PDF files, such as customizing the viewer or handling advanced features, you can use PDF.js, a JavaScript library for rendering PDFs in the browser.

  1. Install PDF.js:

    Include PDF.js in your Angular project. You can install it via npm:

    npm install pdfjs-dist

  2. Component TypeScript Code:

    Import PDF.js in your component TypeScript file (app.component.ts or your specific component file):

    import { Component, ViewChild, ElementRef, AfterViewInit } from '@angular/core'; import * as pdfjs from 'pdfjs-dist'; @Component({ selector: 'app-pdf-viewer', templateUrl: './pdf-viewer.component.html', styleUrls: ['./pdf-viewer.component.css'] }) export class PdfViewerComponent implements AfterViewInit { @ViewChild('pdfViewer') pdfViewer: ElementRef; ngAfterViewInit() { const pdfPath = 'path/to/your/file.pdf'; // Replace with your PDF file path pdfjs.getDocument(pdfPath).promise.then(pdf => { pdf.getPage(1).then(page => { const canvas = this.pdfViewer.nativeElement as HTMLCanvasElement; const context = canvas.getContext('2d'); const viewport = page.getViewport({ scale: 1.5 }); canvas.height = viewport.height; canvas.width = viewport.width; page.render({ canvasContext: context, viewport: viewport }); }); }); } }

  3. Component Template (HTML):

    Use a <canvas> element to render the PDF using PDF.js:

    <div> <canvas #pdfViewer></canvas> </div>

  4. Explanation:

    • PDF.js: Allows you to load and render PDF files in a custom manner, such as displaying on a <canvas> element.
    • getDocument(): Loads the PDF file specified by pdfPath.
    • getPage(): Retrieves a specific page from the loaded PDF document.
    • Rendering: Renders the PDF page onto the <canvas> element using the PDF.js API.

Notes:

  • Cross-Origin Requests: Ensure your PDF files are accessible to the Angular application via proper CORS settings or by serving them from the same origin.
  • Performance: Using PDF.js gives you more control and flexibility but adds complexity compared to simply embedding the PDF using <embed> or <object>.

Choose the approach that best fits your application's requirements based on simplicity, customization needs, and desired viewer features.

Examples

  1. "How to load a PDF file in Angular 2?"

    Description: This query explains how to load a PDF file using the ng2-pdf-viewer package.

    Code:

    npm install ng2-pdf-viewer --save 
    import { Component } from '@angular/core'; @Component({ selector: 'app-pdf-viewer', template: `<pdf-viewer [src]="pdfSrc" style="display: block;"></pdf-viewer>`, }) export class PdfViewerComponent { pdfSrc = 'assets/sample.pdf'; }

  2. "How to display PDF from URL in Angular 2?"

    Description: This query demonstrates how to display a PDF from an external URL.

    Code:

    pdfSrc = 'https://www.example.com/sample.pdf';

  3. "Angular 2 PDF viewer with zoom feature?"

    Description: This query explains how to implement zoom functionality using ng2-pdf-viewer.

    Code:

    <pdf-viewer [src]="pdfSrc" [zoom]="zoom" style="display: block;"></pdf-viewer>

  4. "Using PDF.js with Angular 2?"

    Description: This query illustrates how to use PDF.js directly to display PDF files.

    Code:

    npm install pdfjs-dist --save 
    import * as pdfjsLib from 'pdfjs-dist'; pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.0.550/pdf.worker.js'; const loadingTask = pdfjsLib.getDocument('assets/sample.pdf'); loadingTask.promise.then(pdf => { // Render PDF });

  5. "Angular 2 display PDF with search functionality?"

    Description: This query discusses implementing search within a PDF viewer.

    Code:

    // Add search logic to find text in PDF

  6. "How to print PDF in Angular 2?"

    Description: This query explains how to implement a print functionality for the displayed PDF.

    Code:

    printPdf() { window.print(); }

  7. "How to handle PDF loading errors in Angular 2?"

    Description: This query shows how to manage errors while loading PDFs.

    Code:

    <pdf-viewer [src]="pdfSrc" (error)="handleError($event)"></pdf-viewer> handleError(error) { console.error('PDF loading error:', error); }

  8. "Display multiple PDFs in Angular 2?"

    Description: This query illustrates how to manage and display multiple PDF files.

    Code:

    pdfs = ['assets/sample1.pdf', 'assets/sample2.pdf'];

  9. "How to style PDF viewer in Angular 2?"

    Description: This query explains how to apply custom styles to the PDF viewer.

    Code:

    pdf-viewer { border: 1px solid #ccc; height: 500px; }

  10. "Angular 2 PDF viewer with navigation controls?"

    Description: This query discusses adding navigation controls to the PDF viewer.

    Code:

    <button (click)="previousPage()">Previous</button> <button (click)="nextPage()">Next</button>

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