Javascript Express multer在req.file上返回未定义
我试图将一个文件传递给节点,而express不会将其存储在req.body中,因此我使用multer中间件,但每当我记录req.file时,我都会得到未定义的文件。我不确定我做错了什么 react/index.jsJavascript Express multer在req.file上返回未定义,javascript,reactjs,express,multer,Javascript,Reactjs,Express,Multer,我试图将一个文件传递给节点,而express不会将其存储在req.body中,因此我使用multer中间件,但每当我记录req.file时,我都会得到未定义的文件。我不确定我做错了什么 react/index.js fileSelectHandler = e => { axios.post("/api/upload", { profilePic: e.target.files[0] }); this.setState({ profilePic: e.target.files[0]
fileSelectHandler = e => {
axios.post("/api/upload", { profilePic: e.target.files[0] });
this.setState({ profilePic: e.target.files[0] });
};
render() {
return (
<input
onChange={event => this.fileSelectHandler(event)}
name="profilePic"
type="file"
/>
);
}
您可以改为使用上载文件
fileSelectHandler = e => {
const formData = new FormData();
const profilePic = e.target.files[0];
formData.append("profilePic", profilePic);
axios.post("/api/upload", formData);
this.setState({ profilePic });
};
您可以改为使用上载文件
fileSelectHandler = e => {
const formData = new FormData();
const profilePic = e.target.files[0];
formData.append("profilePic", profilePic);
axios.post("/api/upload", formData);
this.setState({ profilePic });
};
我认为你需要上传你的文件作为一个表单数据类型,如下所示
fileSelectHandler = e => {
const formData = new FormData();
formData.append(‘profilePic’,e.target.files[0]);
const config = {
headers:{
‘content-type’:’multipart/form-data’
}
}
axios.post("/api/upload", formData, config);
this.setState({ profilePic: e.target.files[0] });
};
希望能有所帮助。我认为您需要将文件上传为表单数据类型,如下所示
fileSelectHandler = e => {
const formData = new FormData();
formData.append(‘profilePic’,e.target.files[0]);
const config = {
headers:{
‘content-type’:’multipart/form-data’
}
}
axios.post("/api/upload", formData, config);
this.setState({ profilePic: e.target.files[0] });
};
希望能有所帮助。多文件输入的另一个示例。在Express JS上测试
function uploadImages(post) {
return new Promise((resolve, reject) => {
const formData = new FormData();
for( var i = 0; i < post.length; i++ ){
formData.append('multifiles', post[i]);
}
let jsonPost = {
method: POST_REQUEST,
url: UPLOAD_FILE_URL,
data: formData,
headers: {
'content-type': 'multipart/form-data',
}
};
fetchData(jsonPost)
.then(res => {
console.log("RESULT uploadImages: ", res.data);
resolve(res.data);
})
.catch(reject);
});
}
函数上传图像(post){
返回新承诺((解决、拒绝)=>{
const formData=new formData();
对于(变量i=0;i{
log(“结果上传图像:”,res.data);
解析(res.data);
})
.捕获(拒绝);
});
}
多文件输入的另一个示例。在Express JS上测试
function uploadImages(post) {
return new Promise((resolve, reject) => {
const formData = new FormData();
for( var i = 0; i < post.length; i++ ){
formData.append('multifiles', post[i]);
}
let jsonPost = {
method: POST_REQUEST,
url: UPLOAD_FILE_URL,
data: formData,
headers: {
'content-type': 'multipart/form-data',
}
};
fetchData(jsonPost)
.then(res => {
console.log("RESULT uploadImages: ", res.data);
resolve(res.data);
})
.catch(reject);
});
}
函数上传图像(post){
返回新承诺((解决、拒绝)=>{
const formData=new formData();
对于(变量i=0;i{
log(“结果上传图像:”,res.data);
解析(res.data);
})
.捕获(拒绝);
});
}