React-从Ajax发布请求的响应的Meta-Data元素中获取“消息”

Question

So I have received this response from an Ajax post request (part of the response is shown) where:

Data:
  Meta-Data:
    Topic : "Sign-Up"
    Message : "Already in the System!"
    Response Code : "650"
.
.
.  

how can I fetch the message and show it to user? I was thinking I could do this in React:

    state = {
    username : "John",
    password : "somePass",
    postResponse : null
    }
    axios.post(URL, JSON.stringify({ username : this.state.username , password: this.state.password})
    .then(response => { this.setState({postResponse : response.data}) }

and then in render() I do:

     render(){
let message = null; 
    if (this.state.postResponse){
    message = <p>{this.postResponse.data.meta-data.message}</p> //apparently the dash is breaking the code!
    }
     return(<div> {message} </div>)}

Which doesn't work at all! "it is a part of my code, I hope I've included all necessary parts"

Answer 1

Two things I can see. You had this.postResponse. It should be this.state.postResponse from what I can tell. Also, you need to put “meta-data” into quotes and use brackets to reference it, as shown below.

state = {
    username : "John",
    password : "somePass",
    postResponse : null
    }
    axios.post(URL, JSON.stringify({ username : this.state.username , password: this.state.password})
    .then(response => { this.setState({postResponse : response.data}) }

render(){
  let message = null; 
  if (this.state.postResponse){
    message = <p>{this.state.postResponse[“meta-data”].message}</p>
    }
     return(<div> {message} </div>)}