constformData=newFormData(ReactDOM.findDOMNode(this.form.current)); formData.append('file_photo',this.filePhoto.current.files[0]); } render(){ return<> </>; } } Programming Language: ECMAScript
当你尝试上传文件时,如果formData.append的值为null或undefined,通常是因为以下原因之一: 文件输入未正确绑定:文件输入元素()未正确绑定到React组件的状态。 文件选择后未更新状态:用户选择了文件,但React组件的状态未更新以反映这一变化。 解决方法 确保文件输入元素正确绑定到组件状态,并在用户选择文件后更新状态。以...
const formData = new FormData(this.form); for (const [key, value] of formData.entries()) { formObject[key] = value; } 1. 2. 3. 4. 给我同样的错误 所以我没有使用FormData,我只是手动构建一个对象 import React from 'react'; import formDataToObject from 'form-data-to-object'; ... le...
input标签,type为file, 点击之后可以拿到上传的图片file, 但是let filedata = new formdata之后, 用filedata.append('file',file), console.log(filedata),只是一个formData的空对象。怎么回事? react项目。 html: js: uploadCardImgFront = (event) => { let file = event.target.files[0]; console.log...
请使用FormData.get方法获取。 var formData = new FormData(); formData.append("username", "Groucho"); formData.append("accountnum", 123456); console.log(formData.get("username")) // Groucho 如果是safari浏览器,可以polyfill一下. https://github.com/jimmywarti...有...
执行'append‘：参数2不是'Blob’类型。在新的ApolloErrorENBlob、ArrayBuffer、File、FileReader和FormData...
在react中使用 FormData, append后 formData依然为空, var formData = new FormData(); formData.append("username", "Groucho"); formData.append("accountnum", 123456); console.log(formData)log知道的朋友帮忙看看. 查看完整描述1 回答1 回答 0 关注 3939 浏览 关注 慕课专栏...
Hi, I am trying to upload images from my react native app to graphql by using Apollo client with createUploadLink(). I am trying to mutate data by passing a ReactNativeFile as a variable, then it says network request failed: Failed to execute 'append' on 'FormData': parameter 2 is ...
NotificationsYou must be signed in to change notification settings Fork320 Star789 New issue Merged afc163merged 3 commits intoreact-component:masterfromLin47:fix/formdata.append Apr 20, 2020 +1−1 Conversation4Commits3Checks0Files changed1 ...
append(`file${index}`, file); }); console.log(formData.entries()); await axios .post("/api/farmers/csv", formData) .then((response) => { if (response.data.success) { console.log(response.data.results); } else { console.log(response); } }) .catch((error) => { console.log(...