Submit form in React without jQuery AJAX

问题

I'm trying to submit my form using formspree in a static site I'm building with React. I've gotten close, but now completely lost.

I'm trying to use ES6 Promise function but don't know how to complete it.

Here is my current code:

import React from 'react';
import { Link } from 'react-router';


import { prefixLink } from 'gatsby-helpers';
import { config } from 'config';

import Headroom from 'react-headroom';

import Nav from './nav.js';

import '../css/main.scss';

import Modal from 'boron/DropModal';

import {Input, Label,Textarea, Button} from 're-bulma';

const modalStyle = {
  minHeight: '500px',
  backgroundColor: '#303841'
};

const backdropStyle = {
  backgroundColor: '#F6C90E'
};

const contentStyle = {
  backgroundColor: '#303841',
  padding: '3rem'
};

const gotcha = {
  display: 'none'
};

const email = 'https://formspree.io/dillonraphael@gmail.com';




export default class RootTemplate extends React.Component {
  static propTypes = {
    location: React.PropTypes.object.isRequired,
    children: React.PropTypes.object.isRequired,
  }

  static contextTypes = {
    router: React.PropTypes.object.isRequired,
  }

  constructor() {
    super();
    this.showModal = this.showModal.bind(this);
  }

  showModal () {
    this.refs.modal.show();
  }

  formSubmit(e) {
    e.preventDefault();
    let data = {
      name: this.refs.name.value,
      email: this.refs.email.value,
      message: this.refs.message.value
    }
    return new Promise((resolve, reject) => {
      const req = new XMLHttpRequest();
      req.open('POST', email);
    });
    console.log(data);
  }

  render() {
    return (
      <div>
        <Headroom>
          <Nav showModal={this.showModal}/>
        </Headroom>
        <Modal ref="modal" modalStyle={modalStyle} contentStyle={contentStyle} backdropStyle={backdropStyle}>
          <form ref='contact_form' onSubmit={::this.formSubmit}>
            <Label>Name:</Label>
            <Input ref="name" />
            <Label>Email:</Label>
            <Input ref="email" type="email"/>
            <Label>Message:</Label>
            <Textarea ref="message" />
            <Input type="text" name="_gotcha" style={gotcha}/>
            <Button buttonStyle="isOutlined" color="isWarning">Submit</Button>
          </form>
        </Modal>
        {this.props.children}
      </div>
    );
  }
}

I also currently get this error:

Object {name: undefined, email: undefined, message: undefined}

Any help would be greatly appreciated. Really trying to learn.

回答1:

I might be wrong but from what I see you barely need to use Promise here. Try this instead

formSubmit = (e) => {
    e.preventDefault();
    const {name, email, message} = this.refs
    const formData = new FormData();
    formData.append("name", name.value);
    formData.append("email", email.value);
    formData.append("message", message.value);
    const req = new XMLHttpRequest();
    req.open('POST', url);
    req.send(formData);
  }

And I renamed previosley defined cosnt email to url

回答2:

you could try fetch.

Example promise code:

var form = document.querySelector('form')


function checkStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response
  } else {
    var error = new Error(response.statusText)
    error.response = response
    throw error
  }
}

function parseJSON(response) {
  return response.json()
}

    fetch('/users',{
       method: 'POST',
       body: new FormData(form)
       })
      .then(checkStatus)
      .then(parseJSON)
      .then(function(data) {
        console.log('request succeeded with JSON response', data)
      }).catch(function(error) {
        console.log('request failed', error)
      })

回答3:

I finally figured it out. Thanks for all the help to everyone. The main issue was that the re-bulma npm library didn't allow "ref" for their <Input /> component. So I opted to the regular html input. I'm also using the Axios library to handle the request. This my updated code below, hope this helps someone.

formSubmit (e){
    e.preventDefault();

    let form = document.querySelector('form') 

    let name = this.nameRef.value
    let email = this.emailRef.value
    let message = this.messageRef.value


    axios.post(url, {
      data: {
        name: name,
        email: email,
        message: message
      }
    })
    .then(function (response) {
      console.log(response);
      form.reset()
    })
    .catch(function(error) {
      console.log(error);
      form.reset()
    });
  }

And the form markup:

 <form onSubmit={::this.formSubmit}>
     <div className="formInput">
        <input type="text" placeholder="Name" ref={(input) => this.nameRef = input} />
      </div>
      <div className="formInput">
        <input type="email" placeholder="Email" ref={(input)=> this.emailRef = input} />
      </div>
      <div className="formInput">
        <textarea placeholder="Message" ref={(input) => this.messageRef = input} />
      </div>
      <input type="text" name="_gotcha" style={gotcha}/>
      <div className="formInput">
        <Button buttonStyle="isOutlined" color="isWarning">Submit</Button>
      </div>
  </form>

来源：https://stackoverflow.com/questions/40206596/submit-form-in-react-without-jquery-ajax