如何使用角度为2的jsPDF

Question

我收到一个错误:没有定义jsPDF,我现在使用以下代码:

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');
    }
} 

我已经安装了jsPDF的npm,但不知道如何导入jspdf并使用angular-cli运行:1.0.0-beta.17

Answer 1

我已经完成了这项工作,经过大量的研发后,他们只需按照以下步骤操作: 安装:

npm install jspdf --save

typings install dt~jspdf --global --save

npm install @types/jspdf --save

在angular-cli.json中添加以下内容:

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

HTML:

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

组件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');
    }
}

Answer 2

我创建基于一个jsPdf演示这个答案与帮助@gsmalhotra

首先安装

npm install jspdf --save

我使用了图像数组,首先将图像转换为base64 (jsPDF不允许使用图像URL)

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;
}

然后在循环中,我调用了上面的函数,返回base64图像,然后使用将图像添加到PDF 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代码

<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>

演示
代码

Answer 3

旧问题，但这是我在我的角度应用程序中启动并运行的替代解决方案。我最终修改了这个jsPDF解决方案，使其无需使用ionic / cordova CLI即可工作。

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

向包含要生成PDF内容的div中添加一个id

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

导入库

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

添加生成PDF的方法

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);

    });
}

我发现此解决方案对于我的Web应用程序非常有效，并且非常有益，因为我可以控制何时生成PDF（异步接收数据后）。同样，我不需要全局安装任何库。