如何在 `gatsby js` 项目中处理文件上传？

Question

在 netlify 上托管的 Gatsby Js 项目中有一个很好的 article 解释了如何处理表单提交。然而，它只是关于文本值提交，表单包含一些文件输入怎么样？

任何人都可以在这里阐明一些问题吗？

Answer 1

Netlify 无需任何特殊配置即可在其表单处理程序中支持文件上传：https://www.netlify.com/docs/form-handling/#file-uploads

Netlify Forms can receive files uploaded via form submissions. To do this, add an input with type="file" to any form. When a form is submitted, a link to each uploaded file will be included in the form submission details. These are viewable in the Netlify app, in email notifications, and via our API.

Answer 2

感谢@coreyward 的帮助。我发现这里的问题是如何使用 javascript fetch API 到 post 表单数据。所以这里的解决方案非常简单：

const encode = (data) => {
  const formData = new FormData()
  Object.keys(data)
    .map(key => {
      if (key === 'files') {
        for (const file of data[key]) {
          formData.append(key, file, file.name)
        }
      } else {
        formData.append(key, data[key])
      }
    })
  return formData
}

await window.fetch('/', {
    method: 'POST',
    body: encode({ 'form-name': 'loan', ...this.state, userId: netlifyIdentity.currentUser().id }),
  })

您会注意到，唯一棘手的部分是将 official sample article 的 encode 函数从 uri encoding 重写为 form data encoding。

Answer 3

作为替代解决方案，您可以使用 Getform.io 在 Gatsby.js 项目中设置文件上传表单。

在此article中，他们展示了一个使用 Axios 的示例：

import axios from 'axios';
import React, { useState } from "react"
import 'bootstrap/dist/css/bootstrap.min.css';


const GETFORM_FORM_ENDPOINT = "YOUR-FORM-ENDPOINT";


function Form() {
    const [formStatus, setFormStatus] = useState(false);
    const [query, setQuery] = useState({
        name: "",
        email: "",
    });

    const handleFileChange = () => (e) => {
        setQuery((prevState) => ({
            ...prevState,
            files: e.target.files[0]
        }));
    };

    const handleChange = () => (e) => {
        const name = e.target.name;
        const value = e.target.value;
        setQuery((prevState) => ({
            ...prevState,
            [name]: value
        }));
    };

    const handleSubmit = (e) => {
        e.preventDefault();
        const formData = new FormData();
        Object.entries(query).forEach(([key, value]) => {
            formData.append(key, value);
        });

        axios
            .post(
                GETFORM_FORM_ENDPOINT,
                formData,
                {headers: {Accept: "application/json"}}
            )
            .then(function (response) {
                setFormStatus(true);
                setQuery({
                    name: "",
                    email: "",
                });
                console.log(response);
            })
            .catch(function (error) {
                console.log(error);
            });
    };
    return (
        <div class="container-md">
            <h2>Gatsby File Upload Form using Getform.io</h2>
            <form
                acceptCharset="UTF-8"
                method="POST"
                enctype="multipart/form-data"
                id="gatsbyForm"
                onSubmit={handleSubmit}
            >
                <div className="form-group mb-2">
                    <label for="exampleInputEmail1">Email address</label>
                    <input
                        type="email"
                        className="form-control"
                        placeholder="Enter your email"
                        required
                        name="email"
                        value={query.email}
                        onChange={handleChange()}
                    />
                </div>
                <div className="form-group mb-2">
                    <label for="exampleInputName">Name</label>
                    <input
                        type="text"
                        className="form-control"
                        placeholder="Enter your name"
                        required
                        name="name"
                        value={query.name}
                        onChange={handleChange()}
                    />
                </div>
                <hr/>
                <div className="form-group mt-3">
                    <label className="mr-2">Upload your Resume:</label>
                    <input name="file" type="file" onChange={handleFileChange()}/>
                </div>
                <hr/>
                {formStatus ? (
                    <div className="text-success mb-2">
                        Your message has been sent.
                    </div>
                ) : (
                    ""
                )}
                <button type="submit" className="btn btn-primary">Submit</button>
            </form>
        </div>
    );
}

export default Form

PS：在他们的免费计划中，他们允许您提交最大 5MB 的单个文件。

如何在 `gatsby js` 项目中处理文件上传？

How to handle file uploads in a `gatsby js` project?

gatsby

netlify