如何使用 Angular: HTML 转换为 PDF

Question

我正在使用 Angular，我想将表格从 html 转换为 pdf，这是我在 component.ts 中的代码：

downloadPDF() {
    const doc = new jsPDF();
    const specialElememtHandlers = {
        '#editor'(element, renderer) {
            return true;
        }
    };

    doc.fromHTML(this.content.nativeElement.innerHTML, 15, 15, {
        width: 190,
        elementHandlers: specialElememtHandlers
    });
    doc.save('test.pdf');
}

我的 html 代码是：

<button (click)="downloadPDF()">Save as PDF</button>

我实际上可以下载pdf，但它完全是白色的。

Answer 1

首先安装这个包

npm 安装 jspdf

并安装 html2canvas 包。

npm 安装 html2canvas

使用 import 语句将其导入到我们的组件中。

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

在您的 TS 代码中：

import { Component, OnInit, ElementRef ,ViewChild} from '@angular/core';  
import * as jspdf from 'jspdf';  
import html2canvas from 'html2canvas';  

@Component({  
  selector: 'app-htmltopdf',  
  templateUrl: './htmltopdf.component.html',  
  styleUrls: ['./htmltopdf.component.css']  
})  
export class HtmltopdfComponent{  
  public captureScreen()  
  {  
    var data = document.getElementById('contentToConvert');  //Id of the table
    html2canvas(data).then(canvas => {  
      // Few necessary setting options  
      let imgWidth = 208;   
      let pageHeight = 295;    
      let imgHeight = canvas.height * imgWidth / canvas.width;  
      let heightLeft = imgHeight;  

      const contentDataURL = canvas.toDataURL('image/png')  
      let pdf = new jspdf('p', 'mm', 'a4'); // A4 size page of PDF  
      let position = 0;  
      pdf.addImage(contentDataURL, 'PNG', 0, position, imgWidth, imgHeight)  
      pdf.save('MYPdf.pdf'); // Generated PDF   
    });  
  }  
}

Answer 2

您可以使用库“PrintJS”将 html 模板转换为 pdf。 https://printjs.crably.com/

Answer 3

听听StackBlitz 演示代码

希望这会有所帮助

Answer 4

首先安装这个包

npm install jspdf
npm install html2canvas@1.0.0-alpha.12 //working with this html2canvas version.

使用导入语句（app.component.ts）将其导入到我们的组件中。

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

添加 app.component.html

<div class="abc" id="content">
    <h1>Hello World!</h1>
    <button (click)="Screen()">make pdf</button>
</div>

添加 app.component.ts

Screen()
{  
    var data = document.getElementById('content');  
    html2canvas(data).then(canvas => {  
        // Few necessary setting options  
        var imgWidth = 208;   
        var pageHeight = 295;    
        var imgHeight = canvas.height * imgWidth / canvas.width;  
        var heightLeft = imgHeight;  

        const contentDataURL = canvas.toDataURL('image/png')  
        let pdf = new jspdf('p', 'mm', 'a4'); // A4 size page of PDF  
        var position = 0;  
        pdf.addImage(contentDataURL, 'PNG', 0, position, imgWidth, imgHeight)  
        pdf.save('MYPdf.pdf'); // Generated PDF   
    });  
}