REACT fetch post request

Question

I have problem with routing post request I need to build register form and post input from form to mongodb I made router and post route on server side and it works ok (when I use postman)

//form is required model

 router.route('/').post(function(req,res,next){ res.send(req.body) form.create( {"first_name": req.body.first_name, "last_name": req.body.last_name }).then(function(data){ res.send(data); console.log(data); }).catch(function(err){console.log(err)}); });

But I need to fire it form client side, not postman. And here i am lost. I can do it with but when i add onSubmit action it doesnt work. And I need to use new function to fire another thing without redirecting to another page. How to pass this.refs.first_name.value to body so that i could use fetch function?? Below react component

added this JavaScript/JSON snippet

 export default class Form extends React.Component { constructor(props){ super(props); this.handleSubmit = this.handleSubmit.bind(this); } handleSubmit(event){ event.preventDefault(); console.log(this.refs.first_name.value); fetch('/', { method: 'post', body: { "first_name": this.refs.first_name.value } }); }; render () { return ( <div id="signup"> <form onSubmit={this.handleSubmit}> <input ref="first_name" placeholder="First Name" type="text" name="first_name"/><br /> <input placeholder="Last Name" type="text" name="last_name"/><br /> <button type="Submit">Start</button> </form> </div> ) } }

Answer 1

I guess the way you are using ref has been deprecated. try below see if you have any luck.

 export default class Form extends React.Component { constructor(props){ super(props); this.handleSubmit = this.handleSubmit.bind(this); } handleSubmit(event){ event.preventDefault(); fetch('/', { method: 'post', headers: {'Content-Type':'application/json'}, body: { "first_name": this.firstName.value } }); }; render () { return ( <div id="signup"> <form onSubmit={this.handleSubmit}> <input ref={(ref) => {this.firstName = ref}} placeholder="First Name" type="text" name="first_name"/><br /> <input ref={(ref) => {this.lastName = ref}} placeholder="Last Name" type="text" name="last_name"/><br /> <button type="Submit">Start</button> </form>​ </div>​ ) } }  export default class Form extends React.Component { constructor(props){ super(props); this.handleSubmit = this.handleSubmit.bind(this); } handleSubmit(event){ event.preventDefault(); fetch('/', { method: 'post', headers: {'Content-Type':'application/json'}, body: { "first_name": this.firstName.value } }); }; render () { return ( <div id="signup"> <form onSubmit={this.handleSubmit}> <input ref={(ref) => {this.firstName = ref}} placeholder="First Name" type="text" name="first_name"/><br /> <input ref={(ref) => {this.lastName = ref}} placeholder="Last Name" type="text" name="last_name"/><br /> <button type="Submit">Start</button> </form>​ </div>​ ) } }  export default class Form extends React.Component { constructor(props){ super(props); this.handleSubmit = this.handleSubmit.bind(this); } handleSubmit(event){ event.preventDefault(); fetch('/', { method: 'post', headers: {'Content-Type':'application/json'}, body: { "first_name": this.firstName.value } }); }; render () { return ( <div id="signup"> <form onSubmit={this.handleSubmit}> <input ref={(ref) => {this.firstName = ref}} placeholder="First Name" type="text" name="first_name"/><br /> <input ref={(ref) => {this.lastName = ref}} placeholder="Last Name" type="text" name="last_name"/><br /> <button type="Submit">Start</button> </form>​ </div>​ ) } } 

Here is a link to react docs about refs

Answer 2

This is how I made my post request in React.js;

const res = fetch('http://15.11.55.3:8040/Device/Movies', {
    method: 'post',
    headers: { 'Content-Type': 'application/json' },
    body: {
     id: 0,
    },
   })
   .then((response) => response.json())
   .then((responseJson) => {
     return responseJson.movies;
   })
   .catch((error) => {
     console.error(error);
   });

Answer 3

You can use the concept of controlled components.

For that, add state value,

constructor(props){
  super(props);
  this.handleSubmit = this.handleSubmit.bind(this);
  this.state={ firstname:"", lastname:""} 
}

Now input fields to be like,

<input placeholder="First Name" type="text" value={this.state.firstname} onChange={(ev)=>this.setState({firstname:ev.target.value})}/>
<input placeholder="Last Name" type="text" value={this.state.lastname} onChange={(ev)=>this.setState({lastname:ev.target.value})}/>

and handleSubmit should be like,

handleSubmit(event){ 
  event.preventDefault();
  fetch('/', {
   method: 'post',
   headers: {'Content-Type':'application/json'},
   body: {
    "first_name": this.state.firstName
   }
  });
 };

Answer 4

we need to make sending data as json stringify

handleSubmit(event){ 
    event.preventDefault();
    fetch('/', {
       method: 'post',
       headers: {'Content-Type':'application/json'},
       body: JSON.stringify({
            "first_name": this.state.firstName
       })
    });
};