如何使用html2canvas将html页面适配到a4大小的页面

Question

我已经工作了几天来解决这个问题，但我不能解决，可能是因为缺乏html2canva的知识，或者它不想被修复。我唯一想要的是适合我的a4大小的单个页面上的pdf，但它总是在两个页面渲染。不知道我哪里错了。请给我一些建议。

这是我的代码：

​

document.querySelector('#temp').contentEditable = true;

function createpdf() {
  let body = document.body
  let html = document.documentElement
  let height = Math.max(body.scrollHeight, body.offsetHeight,
    html.clientHeight, html.scrollHeight, html.offsetHeight)
  let element = document.querySelector('#temp')
  let heightCM = height / 35.35
  html2pdf(element, {
    margin: 1,
    filename: 'MyResume.pdf',
    image: {
      type: 'jpeg',
      quality: 4
    },
    html2canvas: {
      dpi: 400,
      letterRendering: true,
      scale: 3
    },
    jsPDF: {
      orientation: 'portrait',
      unit: 'cm',
      //   format: [heightCM, 50]
      format: 'a4'

    }
  }).save()
}

@page {
  size: A4;
  margin: 1cm;
}

/* p{
  font-size: 10px;
}
b{
  font-size: 10px;
}
li{
  font-size: 10px;
} */

body {
  margin: 0px;
}

.border {
  border-bottom: 1px solid red;
  padding-bottom: -4px;
}

.spacing {
  margin-top: -10px;
}

.paddingtop {
  padding-top: 15px;
  border-top: 1px solid red;
}

.paddingbottom {
  padding-bottom: -14px;
}

.right1 {
  padding-left: 15px;
  margin-left: 130px;
  padding-top: -53px;
}

.right2 {
  padding-left: 15px;
  margin-left: 130px;
  padding-top: -60px;
}

.right3 {
  padding-left: 15px;
  margin-left: 130px;
  padding-top: -52px;
}

.border1 {
  border-right: 1px solid red;
  margin-right: 596px;
  padding-bottom: 12px;
}

.border2 {
  border-right: 1px solid red;
  margin-right: 596px;
  padding-bottom: 0px;
}

.border3 {
  border-right: 1px solid red;
  margin-right: 596px;
  padding-bottom: 8px;
  margin-top: 18px;
}

.blankline {
  padding-bottom: 6px;
}

[contenteditable]:focus {
  outline: 0px solid transparent;
}


/* #pdf {
  width:650px;
  height:400px;
  position:absolute;
  left:29%;
  font-size:16px;
} */

#page {
  /* width: 794px; */
  /* height: 29.7cm; */
  width: 21cm;
  background-color: white;
  margin: 1% auto 1% auto;
  padding: 0.2cm 1.3cm 1cm 1.3cm;
  box-shadow: 0px 0px 20px 0px #000;
  line-height: 1.4em;
  text-align: left;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/0.4.1/html2canvas.min.js"></script>

<script src='https://cdnjs.cloudflare.com/ajax/libs/html2pdf.js/0.9.3/html2pdf.bundle.min.js'></script>

<script type="text/javascript" src="https://svc.webspellchecker.net/spellcheck31/wscbundle/wscbundle.js"></script>

<section id="page">
  <div id="temp">
    <h1>Nitin</h1>
    <p class="paddingbottom">
      <b>INFO</b>
    </p>
    <p class="paddingtop">
      <b>Address: </b> 44 Shirley Ave, West Chicago, IL 60185
    </p>
    <p class="spacing">
      <b>Phone:</b> 563-458-6942
    </p>
    <p class="blankline">
      <b>Email:</b> jmiller@gmail.com
    </p>
    <p class="paddingbottom">
      <b>PROFESSIONAL SUMMARY</b>
    </p>
    <p class="paddingtop blankline">
      A highly resourceful, flexible, innovative and enthusiastic project manager. Processing considerable experience of managing projects from beginning to end, defining the project plan, timeline, scope and executing the analysis before providing detailed
      recommendations. Having an impressive track record of delivering major operational improvement and of orchestrating people, schedules and resources for optimum productivity, efficiency and quality. Keen to find a challenging position with an ambitious
      company where I will able to continue to increase my project management skills.
    </p>
    <p class="border blankline">
      <b>EDUCATIONAL BACKGROUND</b>
    </p>
    <p>
      <b>Oct. 2015 - Apr. 2016</b>
      <br>
      <b>B.Tech (CSE)</b>
    </p>
    <p class="right1">
      Kurukshetra University
      <br> Seth Jai Prakash Mukand Lal Institute of Engineering and Technology, Raduar, District Yamunanagar
      <br> 79.48%
    </p>
    <p class="">
      <b>May 2017 - Jun. 2018</b>
      <br>
      <b>Senior Secondary Certificate</b>
    </p>
    <p class="right2">
      CBSE
      <br> S.D. Public School, Jagadhri
      <br> 92%
    </p>
    <p class="">
      <b>May 2017 - Jun. 2018</b>
      <br>
      <b>Matriculation</b>
    </p>
    <p class="right3">
      ICSE
      <br> St. Thomas School, Jagadhri
      <br> 84.6%
    </p>
    <p class="border blankline">
      <b>TECHNICAL SKILLS</b>
      <ul>
        <li>Beginner of - </li>
        <li>Proficient in - </li>
        <li class="blankline">Sufficient knowledge of - </li>
      </ul>
    </p>
    <p class="border blankline">
      <b>PROJECTS</b>
      <ul>
        <li class="blankline">
          <b>JARVIS - PERSONAL ASSISTANT - </b>
          <br>
          <p>(This project assists the end-user with day to day activities like searching queries in Google, finding locations, sending emails, playing songs, searching instagram profiles, opening webcam and many more.)</p>
        </li>
        <li class="blankline">
          <b>TRAVEL MANIA - </b>
          <br>
          <p>(It is a travelling website that enables users to plan their travel without any hassle. It is a team project in which I worked as a front-end developer.)</p>
        </li>
        <li class="blankline">
          <b>RESPRO - </b>
          <br>
          <p> (It is a website that provides a simple and efficient way of creating resume and cover letter for individuals. It is a team project in which I worked as a front-end developer.)</p>
        </li>
      </ul>
    </p>
    <p class="border blankline">
      <b>TRAININGS</b>
      <ul>
        <li class="blankline">
          <p>Attended 40 days training on “C++” at “WEBCOM Technologies, Yamunanagar” (Jun. 2019 to Jul. 2019).</p>
        </li>
        <li class="blankline">
          <p>Attended 21.5 hours training on "Python" from "Udemy" (Jul. 2020 to Aug. 2020).</p>
        </li>
      </ul>
    </p>
    <p class="border blankline">
      <b>SOFT SKILLS</b>
      <ul>
        <li>Teamwork</li>
        <li>Leadership</li>
        <li>Communication skills</li>
        <li>Time management</li>
      </ul>
    </p>
    <p class="border blankline">
      <b>ACHIEVEMENTS</b>
      <ul>
        <li>Won third position in FashP competition (2019).</li>
        <li>Won first position in Flower Arrangement competition (2012).</li>
        <li class="blankline">Won second position in Drawing competition (2012).</li>
      </ul>
    </p>
  </div>

</section>

<button id="Download" onclick="createpdf();">Download</button>

​

Answer 1

我解决了我的问题，导出HTML到PDF。我为每个div创建画布。也许这会对你们大家有所帮助。

private canvas: any = {
    monthYearCanvas: null,
    monthYearHeight: 0,
    periodCanvas: null,
    periodHeight: 0,
    assetCanvas: null,
    assetHeight: 0,
    badActorCanvas: null,
    badActorHeight: 0,
    eventCanvas: null,
    eventHeight: 0,
    tenLowOffCanvas: null,
    tenLowOffHeight: 0,
};

public triggerPrintReport(): void {
            if (
                this.isLoadingMonthYear ||
                this.isLoadingOnPeriod ||
                this.isLoadingOnAsset ||
                this.isLoadingOnBadActor ||
                this.isLoadingOnEvent ||
                this.isLoadingTenLowOff
            ) {
                alert('Wait for load data');
                return;
            }
    
            this.messageReport = true;
    
            const monthYearHTML = document.getElementById('htmlData-monthYear');
            const periodHTML = document.getElementById('htmlData-period');
            const assetHTML = document.getElementById('htmlData-asset');
            const badActorHTML = document.getElementById('htmlData-badActor');
            const eventHTML = document.getElementById('htmlData-event');
            const tenLowOffHTML = document.getElementById('htmlData-tenLowOff');
    
            this.createCanvasURL(monthYearHTML, 'monthYear');
            this.createCanvasURL(periodHTML, 'period');
            this.createCanvasURL(assetHTML, 'asset');
            this.createCanvasURL(badActorHTML, 'badActor');
            this.createCanvasURL(eventHTML, 'event');
            this.createCanvasURL(tenLowOffHTML, 'tenLowOff');
        }
    
        private createCanvasURL(element: any, type: string): void {
            html2canvas(element).then(canvas => {
                const width = 208;
    
                if (type === 'monthYear') {
                    this.canvas.monthYearHeight = canvas.height * width / canvas.width;
                    this.canvas.monthYearCanvas = canvas.toDataURL('image/png');
                } else if (type === 'period') {
                    this.canvas.periodHeight = canvas.height * width / canvas.width;
                    this.canvas.periodCanvas = canvas.toDataURL('image/png');
                } else if (type === 'asset') {
                    this.canvas.assetHeight = canvas.height * width / canvas.width;
                    this.canvas.assetCanvas = canvas.toDataURL('image/png');
                } else if (type === 'badActor') {
                    this.canvas.badActorHeight = canvas.height * width / canvas.width;
                    this.canvas.badActorCanvas = canvas.toDataURL('image/png');
                } else if (type === 'event') {
                    this.canvas.eventHeight = canvas.height * width / canvas.width;
                    this.canvas.eventCanvas = canvas.toDataURL('image/png');
                } else if (type === 'tenLowOff') {
                    this.canvas.tenLowOffHeight = canvas.height * width / canvas.width;
                    this.canvas.tenLowOffCanvas = canvas.toDataURL('image/png');
                }
    
                this.exportPDF();
            });
        }
    
        private exportPDF(): void {
            const PDF = new jsPDF('p', 'mm', 'a4');
    
            if (
                this.canvas.monthYearCanvas &&
                this.canvas.periodCanvas &&
                this.canvas.assetCanvas &&
                this.canvas.badActorCanvas &&
                this.canvas.badActorCanvas &&
                this.canvas.tenLowOffCanvas
            ) {
                PDF.addImage(this.canvas.monthYearCanvas, 'PNG', 1, 10, 208, this.canvas.monthYearHeight);
                PDF.addImage(this.canvas.periodCanvas, 'PNG', 1, 125, 208, this.canvas.periodHeight);
                PDF.addPage();
                PDF.addImage(this.canvas.assetCanvas, 'PNG', 1, 10, 208, this.canvas.assetHeight);
                PDF.addPage();
                PDF.addImage(this.canvas.badActorCanvas, 'PNG', 1, 10, 208, this.canvas.badActorHeight);
                PDF.addPage();
                PDF.addImage(this.canvas.eventCanvas, 'PNG', 1, 10, 208, this.canvas.eventHeight);
                PDF.addPage('l');
                PDF.addImage(this.canvas.tenLowOffCanvas, 'PNG', 1, 10, 208, this.canvas.tenLowOffHeight);
    
                this.messageReport = false;
    
                PDF.save('angular-demo.pdf');
            }
        }