onChange(e) {
        this.setState({file:e.target.files[0]})
      }

      handleSubmit = event => {
      let user = localStorage.getItem("user")
      user = JSON.parse(user)
      let axiosConfig = {
              headers: {
                  'Content-Type': 'multipart/form-data',
                  'Authorization': user.token
              }
          };

      let url = 'http://ci.apps.cs.ipb.ac.id/jamu/api/explicit/create';
      const formData = new FormData();
      formData.append('doc',this.state.file);
      formData.append('firstName',this.state.firstName);
      formData.append('lastName',this.state.lastName);
      formData.append('title',this.state.title);
      formData.append('datePublish',this.state.datePublish);
      formData.append('citation',this.state.citation);
      formData.append('language',this.state.language);
      formData.append('abstract',this.state.abstrak);
      formData.append('description',this.state.description);
      Axios.post( url,formData,axiosConfig)
        .then(data => {
            const res = data.data;
            console.log(res)
            window.location.href = '/explicit';
        })
        .catch(err => {
            console.log(err)
        });
            event.preventDefault();
    }