How to use jsPDF with angular 2

问题

I got an Error: jsPDF is not defined , I am currenty using following code :

import { Component, OnInit, Inject } from '@angular/core';
import 'jspdf';
declare let jsPDF;
@Component({
  ....
  providers: [
    { provide: 'Window',  useValue: window }
  ]
})
export class GenratePdfComponent implements OnInit {

  constructor(
    @Inject('Window') private window: Window,
    ) { }

  download() {

        var doc = jsPDF();
        doc.text(20, 20, 'Hello world!');
        doc.text(20, 30, 'This is client-side Javascript, pumping out a PDF.');    
        doc.save('Test.pdf');
    }
} 

I have install npm of jsPDF but don't know how import jspdf and run with angular-cli: 1.0.0-beta.17

回答1:

I have done it, after doing lot of R&D , their are few steps to follow as below : Install :

npm install jspdf --save

typings install dt~jspdf --global --save

npm install @types/jspdf --save

Add following in angular-cli.json:

"scripts": [ "../node_modules/jspdf/dist/jspdf.min.js" ]

html:

<button (click)="download()">download </button>

component ts:

import { Component, OnInit, Inject } from '@angular/core';
import * as jsPDF from 'jspdf'
@Component({
  ...
  providers: [
    { provide: 'Window',  useValue: window }
  ]
})
export class GenratePdfComponent implements OnInit {

  constructor(
    @Inject('Window') private window: Window,
    ) { }

  download() {

        var doc = new jsPDF();
        doc.text(20, 20, 'Hello world!');
        doc.text(20, 30, 'This is client-side Javascript, pumping out a PDF.');
        doc.addPage();
        doc.text(20, 20, 'Do you like that?');

        // Save the PDF
        doc.save('Test.pdf');
    }
}

回答2:

I have created a jsPdf demo based on this answer with help from @gsmalhotra

First install

npm install jspdf --save

I have used array of images, first converting the image to base64 (jsPDF doesn't allow image URLs)

getBase64Image(img) {
  var canvas = document.createElement("canvas");
  console.log("image");
  canvas.width = img.width;
  canvas.height = img.height;
  var ctx = canvas.getContext("2d");
  ctx.drawImage(img, 0, 0);
  var dataURL = canvas.toDataURL("image/jpeg");
  return dataURL;
}

Then in a loop, I have called above function which returns base64 image, and then added image to PDF using doc.addImage().

for(var i=0;i<this.images.length;i++){
   let imageData= this.getBase64Image(document.getElementById('img'+i));
   doc.addImage(imageData, "JPG", 10, (i+1)*10, 180, 150);
   doc.addPage();
}

HTML code

<div class="col-md-4" *ngFor="let img of images;let i=index">
    <img id="img{{i}}" class="img-fluid" crossOrigin="Anonymous" [src]="img.url">
</div>

Demo
Code

回答3:

Old question but this is an alternative solution that I got up and running in my angular app. I ended up modifying this jsPDF solution to work without using the ionic/cordova CLI.

npm install jspdf --save
npm install @types/jspdf --save
npm install html2canvas --save
npm install @types/html2canvas --save

Add an id to whichever div contains the content you want to generate the PDF

<div id="html2Pdf">your content here</div>

Import the libraries

import * as jsPDF from 'jspdf';
import * as html2canvas from 'html2canvas';

Add the method for generating the PDF

generatePdf() {
    const div = document.getElementById("html2Pdf");
    const options = {background: "white", height: div.clientHeight, width: div.clientWidth};

    html2canvas(div, options).then((canvas) => {
        //Initialize JSPDF
        let doc = new jsPDF("p", "mm", "a4");
        //Converting canvas to Image
        let imgData = canvas.toDataURL("image/PNG");
        //Add image Canvas to PDF
        doc.addImage(imgData, 'PNG', 20, 20);

        let pdfOutput = doc.output();
        // using ArrayBuffer will allow you to put image inside PDF
        let buffer = new ArrayBuffer(pdfOutput.length);
        let array = new Uint8Array(buffer);
        for (let i = 0; i < pdfOutput.length; i++) {
            array[i] = pdfOutput.charCodeAt(i);
        }

        //Name of pdf
        const fileName = "example.pdf";

        // Make file
        doc.save(fileName);

    });
}

I found this solution worked well for my web app and was beneficial as I have control over when I want to generate the PDF (after receiving data asynchronously). As well, I didn't need install any libraries globally.

来源：https://stackoverflow.com/questions/41484323/how-to-use-jspdf-with-angular-2