在ReactJS中,当你尝试使用FormData对象上传文件时,如果formData.append的值为null或undefined,这意味着你没有正确地获取到文件数据。以下是解决这个问题的步骤: 基础概念 FormData对象用于构建一组键值对,以模拟HTML表单的数据。它通常与XMLHttpRequest的send()方法或fetch()API一起使用,用于发送表单数据,包括文件。...
Blob、ArrayBuffer、File、FileReader和FormData的区别
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... 有用1 回复 撰写回答 你尚未...
在处理程序中，它应该是files
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. 慕尼黑的夜晚无繁华 浏览3919回答 1 ...
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! $LocationInput: LocationInput!
我试图append()实际上是一个Date对象，* 不是 * ISO时间戳字符串。我只是在TypeScript中使用了错误的...
When the video resolution is too high, recording does not work unless I use the H.265 codec. Is it possible to know when to use the H.265 codec? For example: working with h264/h265: {"autoFocusSystem": "contrast-detection", "fieldOfView": 78.63484214515682, "maxExposure": 8, "maxFps...
(!isformdatasubmittersupported()) {\n let { name, type, value } = target;\n if (type === \"image\") {\n let prefix = name ? `${name}.` : \"\";\n formdata.append(`${prefix}x`, \"0\");\n formdata.append(`${prefix}y`, \"0\");\n } else if (name) {\n ...
exportfunctionSurveyCreatorWidget(){// ...creator.onUploadFile.add((_,options)=>{constformData=newFormData();options.files.forEach(file=>{formData.append(file.name,file);});fetch("https://example.com/uploadFiles",{method:"post",body:formData}).then(response=>response.json()).then(result=...