你好学会使用js和react-native。我不能使用FormData它总是显示不支持的bodyinit类型。我想发送文本而不是json.stringfy。谁能帮我?谢谢!
var data = new FormData()
data.append('haha', 'input')
fetch('http://www.mywebsite.com/search.php', {
method: 'post',
body: data
})
.then((response) => response.json())
.then((responseData) => {
console.log('Fetch Success==================');
console.log(responseData);
var tempMarker = [];
for (var p in responseData) {
tempMarker.push({
latitude: responseData[p]['lat'],
longitude: responseData[p]['lng']
})
}
this.setState({
marker: tempMarker
});
})
.catch((error) => {
console.warn(error);
})
.done();
答案 0 :(得分:41)
这是我的简单代码FormData with react-native to post request with string and image。
我使用react-native-image-picker来捕捉/选择照片 react-native-image-picker
let photo = { uri: source.uri}
let formdata = new FormData();
formdata.append("product[name]", 'test')
formdata.append("product[price]", 10)
formdata.append("product[category_ids][]", 2)
formdata.append("product[description]", '12dsadadsa')
formdata.append("product[images_attributes[0][file]]", {uri: photo.uri, name: 'image.jpg', type: 'image/jpeg'})
注意您可以将image/jpeg
更改为您的图片内容类型。您可以获取内容类型表单图像选择器响应。
fetch('http://192.168.1.101:3000/products',{
method: 'post',
headers: {
'Content-Type': 'multipart/form-data',
},
body: formdata
}).then(response => {
console.log("image uploaded")
}).catch(err => {
console.log(err)
})
});
答案 1 :(得分:9)
这对我有用
var serializeJSON = function(data) {
return Object.keys(data).map(function (keyName) {
return encodeURIComponent(keyName) + '=' + encodeURIComponent(data[keyName])
}).join('&');
}
var response = fetch(url, {
method: 'POST',
body: serializeJSON({
haha: 'input'
})
});
答案 2 :(得分:5)
提供其他解决方案;我们也在使用react-native-image-picker
;并且服务器端正在使用koa-multer
;这个设置运作良好:
<强> UI 强>
ImagePicker.showImagePicker(options, (response) => {
if (response.didCancel) {}
else if (response.error) {}
else if (response.customButton) {}
else {
this.props.addPhoto({ // leads to handleAddPhoto()
fileName: response.fileName,
path: response.path,
type: response.type,
uri: response.uri,
width: response.width,
height: response.height,
});
}
});
handleAddPhoto = (photo) => { // photo is the above object
uploadImage({ // these 3 properties are required
uri: photo.uri,
type: photo.type,
name: photo.fileName,
}).then((data) => {
// ...
});
}
<强>客户端强>
export function uploadImage(file) { // so uri, type, name are required properties
const formData = new FormData();
formData.append('image', file);
return fetch(`${imagePathPrefix}/upload`, { // give something like https://xx.yy.zz/upload/whatever
method: 'POST',
body: formData,
}
).then(
response => response.json()
).then(data => ({
uri: data.uri,
filename: data.filename,
})
).catch(
error => console.log('uploadImage error:', error)
);
}
服务器强>
import multer from 'koa-multer';
import RouterBase from '../core/router-base';
const upload = multer({ dest: 'runtime/upload/' });
export default class FileUploadRouter extends RouterBase {
setupRoutes({ router }) {
router.post('/upload', upload.single('image'), async (ctx, next) => {
const file = ctx.req.file;
if (file != null) {
ctx.body = {
uri: file.filename,
filename: file.originalname,
};
} else {
ctx.body = {
uri: '',
filename: '',
};
}
});
}
}
答案 3 :(得分:1)
我一直在寻找解决问题的答案,这就是我的解决方法
我使用expo-document-picker提取文件
const pickDocument = async (tDocument) => {
let result = await DocumentPicker.getDocumentAsync();
result.type = mimetype(result.name);
if (result.type === undefined){
alert("not allowed extention");
return null;
}
let formDat = new FormData();
formDat.append("file", result);
uploadDoc(formDat);
};
const mimetype = (name) => {
let allow = {"png":"image/png","pdf":"application/json","jpeg":"image/jpeg", "jpg":"image/jpg"};
let extention = name.split(".")[1];
if (allow[extention] !== undefined){
return allow[extention]
}
else {
return undefined
}
}
const uploadDoc = (data) => {
fetch("MyApi", {
method: "POST",
body: data
}).then(res => res.json())
.then(response =>{
if (response.result === 1) {
//somecode
} else {
//somecode
}
});
}
这是因为android不会管理文件的mime-type,因此如果您将标头“ Content-type”放到文件中,而是将mime-type放到文件上,它将发送正确的标头
可在iOS和Android上运行
答案 4 :(得分:0)
我使用了带有ImagePicker插件的表单数据。 我得到了它的工作,请检查下面的代码
ImagePicker.showImagePicker(options, (response) => {
console.log('Response = ', response);
if (response.didCancel) {
console.log('User cancelled photo picker');
}
else if (response.error) {
console.log('ImagePicker Error: ', response.error);
}
else if (response.customButton) {
console.log('User tapped custom button: ', response.customButton);
}
else {
fetch(globalConfigs.api_url+"/gallery_upload_mobile",{
method: 'post',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
,
body: JSON.stringify({
data: response.data.toString(),
fileName: response.fileName
})
}).then(response => {
console.log("image uploaded")
}).catch(err => {
console.log(err)
})
}
});
答案 5 :(得分:0)
我已使用react-native-image-picker
选择照片。以我为例,从移动设备选择了照片。我将其信息存储在组件state
中。之后,我将使用POST
发送fetch
请求,如下所示
const profile_pic = {
name: this.state.formData.profile_pic.fileName,
type: this.state.formData.profile_pic.type,
path: this.state.formData.profile_pic.path,
uri: this.state.formData.profile_pic.uri,
}
const formData = new FormData()
formData.append('first_name', this.state.formData.first_name);
formData.append('last_name', this.state.formData.last_name);
formData.append('profile_pic', profile_pic);
const Token = 'secret'
fetch('http://10.0.2.2:8000/api/profile/', {
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "multipart/form-data",
Authorization: `Token ${Token}`
},
body: formData
})
.then(response => console.log(response.json()))
答案 6 :(得分:0)
如果要为formData项设置自定义内容类型:
navigator.credentials.get({
password: true,
federated: {
providers: [
'https://accounts.google.com'
]
}
})
答案 7 :(得分:0)
您可以使用 react-native-image-picker 和 axios(表单数据)
uploadS3 = (path) => {
var data = new FormData();
data.append('files',
{ uri: path, name: 'image.jpg', type: 'image/jpeg' }
);
var config = {
method: 'post',
url: YOUR_URL,
headers: {
Accept: "application/json",
"Content-Type": "multipart/form-data",
},
data: data,
};
axios(config)
.then((response) => {
console.log(JSON.stringify(response.data));
})
.catch((error) => {
console.log(error);
});
}
react-native-image-picker
selectPhotoTapped() {
const options = {
quality: 1.0,
maxWidth: 500,
maxHeight: 500,
storageOptions: {
skipBackup: true,
},
};
ImagePicker.showImagePicker(options, response => {
//console.log('Response = ', response);
if (response.didCancel) {
//console.log('User cancelled photo picker');
} else if (response.error) {
//console.log('ImagePicker Error: ', response.error);
} else if (response.customButton) {
//console.log('User tapped custom button: ', response.customButton);
} else {
let source = { uri: response.uri };
// Call Upload Function
this.uploadS3(source.uri)
// You can also display the image using data:
// let source = { uri: 'data:image/jpeg;base64,' + response.data };
this.setState({
avatarSource: source,
});
// this.imageUpload(source);
}
});
}