如何使用文件输入在 PDFJS 中打开本地 PDF?

问题描述

我想知道是否有办法使用 input type="file" 选择 pdf 文件并使用 PDFJS

I would like to know if there is a way to select a pdf file using input type="file" and open it using PDFJS

推荐答案

您应该能够使用 FileReader 将文件对象的内容作为类型化数组获取，pdfjs 接受该内容(https://mozilla.github.io/pdf.js/examples/)

You should be able to use a FileReader to get the contents of a file object as a typed array, which pdfjs accepts (https://mozilla.github.io/pdf.js/examples/)

//Step 1: Get the file from the input element
inputElement.onchange = function(event) {

    var file = event.target.files[0];

    //Step 2: Read the file using file reader
    var fileReader = new FileReader();

    fileReader.onload = function() {

        //Step 4:turn array buffer into typed array
        var typedarray = new Uint8Array(this.result);

        //Step 5:pdfjs should be able to read this
        const loadingTask = pdfjsLib.getDocument(typedarray);
        loadingTask.promise.then(pdf => {
            // The document is loaded here...
        });


    };
    //Step 3:Read the file as ArrayBuffer
    fileReader.readAsArrayBuffer(file);

 }

自从我在 2015 年编写第一个答案以来，pdfjs API 在某个时候发生了变化.更新以反映截至 2021 年的新 API(感谢@Chiel)以获取更新的答案

The pdfjs API changed at some point since I wrote this first answer in 2015. Updating to reflect the new API as of 2021(thanks to @Chiel) for the updated answer

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