How to use FormData in react-native?

Question

Hi just learn to use js and react-native. I cant use FormData it always shows unsupported bodyinit type. I want to send text rather then JSON.stringify. Can anyone help me? Thanks!

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();

Answer 1

Here is my simple code FormData with react-native to post request with string and image.

I have used react-native-image-picker to capture/select photo 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'})

NOTE you can change image/jpeg to other content type. You can get content type from image picker response.

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)
  })  
});