Javascript REACT 获取发布请求

REACT fetch post request

提问by Kamil Lewandowski

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)

我在路由发布请求时遇到问题我需要构建注册表并将输入从表单发布到 mongodb 我在服务器端做了路由器和发布路由，它工作正常（当我使用邮递员时）

//form is required model?

//表单是必需的模型？

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

但我需要从客户端触发它，而不是邮递员。在这里我迷路了。我可以这样做，但是当我添加 onSubmit 操作时它不起作用。而且我需要使用新函数来触发另一件事而不重定向到另一个页面。如何将 this.refs.first_name.value 传递给 body 以便我可以使用 fetch 函数？？下面反应组件

added this JavaScript/JSON snippet

添加了这个 JavaScript/JSON 片段

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>
?
  )
 }
}

回答by Amir Hoseinian

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

我猜您使用的方式ref已被弃用。试试下面，看看你有没有运气。

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 linkto react docs about refs

这是一个关于反应文档的链接refs

回答by Manoj Rana

we need to make sending data as json stringify

我们需要将发送数据作为 json 字符串化

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

回答by Sabri Mevi?

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

这就是我在 React.js 中发出帖子请求的方式；

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);
   });

回答by Rohith Murali

You can use the concept of controlled components.

您可以使用受控组件的概念。

For that, add state value,

为此，添加状态值，

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

Now input fields to be like,

现在输入字段就像，

<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,

和 handleSubmit 应该是这样的，

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