javascript - Convert PDF to a Base64-encoded string in Javascript

Question

I need to encode a PDF file to Base64 with Javascript. I can create Base64-encoded jpeg or png images in Javascript, but I could not find any way or sample code to create a Base64-encoded string from a PDF file.

Is it there any solution using a HTML5 canvas?

Thanks.

Answer 1

尝试这个 ：-

<input id="inputFile" type="file" onchange="convertToBase64();" />

<script type="text/javascript">
    function convertToBase64() {
        //Read File
        var selectedFile = document.getElementById("inputFile").files;
        //Check File is not Empty
        if (selectedFile.length > 0) {
            // Select the very first file from list
            var fileToLoad = selectedFile[0];
            // FileReader function for read the file.
            var fileReader = new FileReader();
            var base64;
            // Onload of file read the file content
            fileReader.onload = function(fileLoadedEvent) {
                base64 = fileLoadedEvent.target.result;
                // Print data in console
                console.log(base64);
            };
            // Convert data to base64
            fileReader.readAsDataURL(fileToLoad);
        }
    }
</script>

Answer 2

以下是一个人的做法：

• http://blogs.adobe.com/formfeed/2009/08/base64_encode_a_pdf_attachment.html

这是一个链接，它建议了其他几种可能的解决方案：

• 客户端 Javascript 中的 Base64 编码和解码