An example explains how vue implements the online preview function of PDF documents

In recent years, with the popularity of mobile devices and the improvement of network bandwidth, mobile office has gradually become a trend. In terms of file processing, PDF documents have become one of the most commonly used file formats in mobile offices due to their ease of use, multi-platform support, and unified format. Therefore, online preview of PDF documents has become a necessary function.

In the front-end framework, Vue.js is a very advanced framework that is lightweight, efficient, easy to learn, and componentized. In Vue.js, how to preview PDF documents online?

The following is an example of how to implement online preview of PDF documents in Vue.js:

First, reference the pdfjs library in the project (https://github.com/mozilla/ pdf.js). The pdfjs library is a JavaScript-based PDF document processing library developed by Mozilla. It can implement functions such as rendering, previewing, and text selection of PDF documents on the Web.

In the Vue.js component, the way to reference the pdfjs library is as follows:

import pdfjsLib from 'pdfjs-dist/build/pdf';

pdfjsLib.GlobalWorkerOptions.workerSrc = '//mozilla.github.io/pdf.js/build/pdf.worker.js';

Then, in the template of the Vue.js component, use the canvas tag to render the PDF document. The specific code is as follows:

<template>
  <div class="pdf-viewer">
    <canvas ref="canvas"></canvas>
  </div>
</template>

Next, in the script of the Vue.js component, render the PDF document into the canvas tag. The specific code is as follows:

<script>
export default {
  data() {
    return {
      url: 'https://example.com/path/to/sample.pdf' // PDF文档的路径
    };
  },
  mounted() {
    const canvas = this.$refs.canvas; // 获取canvas元素
    const context = canvas.getContext('2d'); // 获取canvas上下文
    const loadingTask = pdfjsLib.getDocument(this.url); // 加载PDF文档

    loadingTask.promise.then((pdf) => {
      const scale = 1.5; // 缩放比例
      const viewport = pdf.getPage(1).getViewport({ scale: scale }); // 获取页码为1的页视图
      canvas.height = viewport.height;
      canvas.width = viewport.width;

      pdf.getPage(1).then((page) => {
        const renderContext = {
          canvasContext: context,
          viewport: viewport
        };
        page.render(renderContext);
      });
    });
  }
}
</script>

Through the above simple code implementation, the function of online preview of PDF documents can be realized in Vue.js. The method of setting the scaling scale and obtaining the specified page number, getPage, can be adjusted according to actual needs.

It should be noted that online preview of PDF documents requires the process of loading PDF documents, so loading effects and exception handling functions need to be added during loading.

The above is a simple method to preview PDF documents online in Vue.js. Whether on mobile or PC, you can use this method to conveniently process PDF documents. At the same time, functions such as search, selection, highlighting, and copying can also be added to the project according to needs to improve the user experience.

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