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...
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(file); var fileData = new FormData(); fileData.ap...
= new FormData(); formData.append('uploadedFile', file); cache: 'default', 'Cont 浏览1提问于2017-01-06得票数 0 回答已采纳 1回答 发送/接收与http交互的图像 、、、 我们目前正在开发一个带有React前端(和快递服务器)和Java后端的应用程序。应用程序必须能够在前端和后端之间发送大量图像和视频。到目前...
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.javascriptreact 有用关注2收藏 回复 阅读5.9k 2 个回答 得票最新 lucifer 5.3k1522 发布...
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(...
react 使用FormData的问题 append 失败JavaScript 慕尼黑的夜晚无繁华 2018-08-14 10:09:22 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....
formData.append('name','ajith') console.log(formData); axios.post('http://localhost:8080/hello/',formData,{ headers: { "Content-Type":"multipart/form-data" } }) 在服务器端,只有文件,而不是字符串值。 @PostMapping(value="/hello", produces = MediaType.APPLICATION_JSON_VALUE) ...
Append a file to FormData from file input in React ES6 8 October 2019 You can use FormData to send form data using AJAX, including files. This is for you if you have to manually add files, you don't take them from a form, for some reason. This snippet is a react component witch ...
network request failed: Failed to execute 'append' on 'FormData': parameter 2 is not of type 'Blob'. at new ApolloError This this the mutation which i am trying to use mutation publishPost( $content: String! $LocationInput: LocationInput! $InputPostAttachment: [InputPostAttachment!] ) { ...
+1−1 Conversation4Commits3Checks0Files changed1 Contributor Lin47commentedApr 17, 2020 #239 Member afc163commentedApr 18, 2020 ci broken coverallscommentedApr 20, 2020 Coverage remained the same at 80.921% when pulling2879b48on Lin47:fix/formdata.appendinto7af31bfon react-component:master. ...