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How to use Layui to develop an application that supports online preview of PDF files

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Oct 24, 2023 pm 12:39 PM

Used to quickly build website pages. Development: Refers to making software

How to use Layui to develop an application that supports online preview of PDF files

With the development of the Internet, more and more applications require online preview of PDF files. This article will introduce how to use Layui to develop an application that supports online preview of PDF files, and provide specific code examples for reference.

1. Project preparation
First of all, you need to prepare the following development environment:

Node.js and npm: used to install and manage project dependencies.
Visual Studio Code or other favorite code editor.
Layui: A simple and easy-to-use front-end UI framework.

2. Create a project

Open a terminal or command prompt, enter the folder where the project is located, and execute the following command to create a new project:
```
mkdir laypdf-app
cd laypdf-app
npm init -y
```
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Install Layui:
```
npm install layui
```
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Create an HTML file named index.html in the root directory of the project and add the following content:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>LayPDF App</title>
    <link rel="stylesheet" href="./node_modules/layui-src/dist/css/layui.css">
    <script src="./node_modules/layui-src/dist/layui.js"></script>
</head>
<body>
    <div class="layui-container">
        <div class="layui-row">
            <div class="layui-col-md8">
                <div class="layui-card">
                    <div class="layui-card-body">
                        <div id="pdf-container"></div>
                    </div>
                </div>
            </div>
            <div class="layui-col-md4">
                <div class="layui-card">
                    <div class="layui-card-body">
                        <input type="file" class="layui-upload-file" id="pdf-file" accept="application/pdf">
                        <hr>
                        <button class="layui-btn layui-btn-normal" id="pdf-upload">上传PDF文件</button>
                    </div>
                </div>
            </div>
        </div>
    </div>
    <script>
        layui.use(['upload', 'layer', 'element'], function() {
            var upload = layui.upload;
            var layer = layui.layer;
            var element = layui.element;

            // 初始化PDF预览器
            var pdfContainer = document.getElementById('pdf-container');
            var pdfViewer = new PDFObject({
                url: '',
                pdfOpenParams: {
                    navpanes: 0,
                    toolbar: 0,
                    statusbar: 0,
                    view: 'FitV'
                }
            }).embed(pdfContainer);

            // 上传PDF文件
            upload.render({
                elem: '#pdf-upload',
                accept: 'file',
                exts: 'pdf',
                choose: function(obj) {
                    obj.preview(function(index, file, result) {
                        // 预览上传的文件
                        pdfViewer.url = result;
                    });
                }
            });
        });
    </script>
</body>
</html>

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3. Run the application

Execute the following command in the terminal or command prompt to start the application:
```
node index.html
```
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Access http://localhost:3000 in the browser, and you will see a page with a PDF previewer and upload button.

4. Description

Layui's upload component is used to process PDF file uploads, and the uploaded file information can be obtained through the choose callback function.
PDFObject is a JavaScript tool library for embedding PDF documents, which can display PDF files in specified HTML elements.
The preview of uploaded files is implemented through the embed method of PDFObject. The preview can be achieved by passing the uploaded file path as a parameter.

Summary
This article introduces how to use Layui to develop an application that supports online preview of PDF files. Uploading and previewing PDF files can be easily achieved through Layui's upload component and PDFObject library. Developers can adjust and optimize the code according to actual needs to meet their own application scenarios.

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