Unable to access nested object in React
I am trying to access single elements within an object and I keep getting an error.
Here is my React Component:
import React, { Component } from "react";
import { fetchCoin } from "../redux/actions";
import { connect } from "react-redux";
class ViewCoin extends Component {
componentDidMount() {
this.props.fetchCoin(this.props.match.params.symbol);
}
render() {
console.log("Props:", this.props.coin);
return (
<div>
<h2>View Item Page</h2>
</div>
);
}
}
const mapStateToProps = state => {
return {
coin: state.coins.coin
};
};
export default connect(mapStateToProps, { fetchCoin })(ViewCoin);This code returns the following object:
{
"BTC": {
"urls": {
"website": [
"https://bitcoin.org/"
],
"twitter": ,
"reddit": [
"https://reddit.com/r/bitcoin"
],
"message_board": [
"https://bitcointalk.org"
],
"announcement": ,
"chat": ,
"explorer": [
"https://blockchain.info/",
"https://live.blockcypher.com/btc/",
"https://blockchair.com/bitcoin/blocks"
],
"source_code": [
"https://github.com/bitcoin/"
]
},
"logo": "https://s2.coinmarketcap.com/static/img/coins/64x64/1.png",
"id": 1,
"name": "Bitcoin",
"symbol": "BTC",
"slug": "bitcoin",
"date_added": "2013-04-28T00:00:00.000Z",
"tags": [
"mineable"
],
"category": "coin"
}
}When trying to access the coin name, for example, I issue the command:
console.log(this.props.coin.BTC.name);
I get the error: Cannot read property 'BTC' of undefined
I tested accessing values in this object outside of React and I am able to access the different values. How would one access a nested object like this using React.
Thanks in advance.
javascript node.js reactjs
asked Nov 21 at 1:40
Kareem Phillip-Jackson
205
add a comment |
I am trying to access single elements within an object and I keep getting an error.
Here is my React Component:
import React, { Component } from "react";
import { fetchCoin } from "../redux/actions";
import { connect } from "react-redux";
class ViewCoin extends Component {
componentDidMount() {
this.props.fetchCoin(this.props.match.params.symbol);
}
render() {
console.log("Props:", this.props.coin);
return (
<div>
<h2>View Item Page</h2>
</div>
);
}
}
const mapStateToProps = state => {
return {
coin: state.coins.coin
};
};
export default connect(mapStateToProps, { fetchCoin })(ViewCoin);This code returns the following object:
{
"BTC": {
"urls": {
"website": [
"https://bitcoin.org/"
],
"twitter": ,
"reddit": [
"https://reddit.com/r/bitcoin"
],
"message_board": [
"https://bitcointalk.org"
],
"announcement": ,
"chat": ,
"explorer": [
"https://blockchain.info/",
"https://live.blockcypher.com/btc/",
"https://blockchair.com/bitcoin/blocks"
],
"source_code": [
"https://github.com/bitcoin/"
]
},
"logo": "https://s2.coinmarketcap.com/static/img/coins/64x64/1.png",
"id": 1,
"name": "Bitcoin",
"symbol": "BTC",
"slug": "bitcoin",
"date_added": "2013-04-28T00:00:00.000Z",
"tags": [
"mineable"
],
"category": "coin"
}
}When trying to access the coin name, for example, I issue the command:
console.log(this.props.coin.BTC.name);
I get the error: Cannot read property 'BTC' of undefined
I tested accessing values in this object outside of React and I am able to access the different values. How would one access a nested object like this using React.
Thanks in advance.
javascript node.js reactjs
asked Nov 21 at 1:40
Kareem Phillip-Jackson
205
looks fine, but you need a constructor.constructor(props){ super(props) }
– Ziyo
Nov 21 at 1:55
add a comment |
I am trying to access single elements within an object and I keep getting an error.
Here is my React Component:
import React, { Component } from "react";
import { fetchCoin } from "../redux/actions";
import { connect } from "react-redux";
class ViewCoin extends Component {
componentDidMount() {
this.props.fetchCoin(this.props.match.params.symbol);
}
render() {
console.log("Props:", this.props.coin);
return (
<div>
<h2>View Item Page</h2>
</div>
);
}
}
const mapStateToProps = state => {
return {
coin: state.coins.coin
};
};
export default connect(mapStateToProps, { fetchCoin })(ViewCoin);This code returns the following object:
{
"BTC": {
"urls": {
"website": [
"https://bitcoin.org/"
],
"twitter": ,
"reddit": [
"https://reddit.com/r/bitcoin"
],
"message_board": [
"https://bitcointalk.org"
],
"announcement": ,
"chat": ,
"explorer": [
"https://blockchain.info/",
"https://live.blockcypher.com/btc/",
"https://blockchair.com/bitcoin/blocks"
],
"source_code": [
"https://github.com/bitcoin/"
]
},
"logo": "https://s2.coinmarketcap.com/static/img/coins/64x64/1.png",
"id": 1,
"name": "Bitcoin",
"symbol": "BTC",
"slug": "bitcoin",
"date_added": "2013-04-28T00:00:00.000Z",
"tags": [
"mineable"
],
"category": "coin"
}
}When trying to access the coin name, for example, I issue the command:
console.log(this.props.coin.BTC.name);
I get the error: Cannot read property 'BTC' of undefined
I tested accessing values in this object outside of React and I am able to access the different values. How would one access a nested object like this using React.
Thanks in advance.
javascript node.js reactjs
asked Nov 21 at 1:40
Kareem Phillip-Jackson
205
I am trying to access single elements within an object and I keep getting an error.
Here is my React Component:
import React, { Component } from "react";
import { fetchCoin } from "../redux/actions";
import { connect } from "react-redux";
class ViewCoin extends Component {
componentDidMount() {
this.props.fetchCoin(this.props.match.params.symbol);
}
render() {
console.log("Props:", this.props.coin);
return (
<div>
<h2>View Item Page</h2>
</div>
);
}
}
const mapStateToProps = state => {
return {
coin: state.coins.coin
};
};
export default connect(mapStateToProps, { fetchCoin })(ViewCoin);This code returns the following object:
{
"BTC": {
"urls": {
"website": [
"https://bitcoin.org/"
],
"twitter": ,
"reddit": [
"https://reddit.com/r/bitcoin"
],
"message_board": [
"https://bitcointalk.org"
],
"announcement": ,
"chat": ,
"explorer": [
"https://blockchain.info/",
"https://live.blockcypher.com/btc/",
"https://blockchair.com/bitcoin/blocks"
],
"source_code": [
"https://github.com/bitcoin/"
]
},
"logo": "https://s2.coinmarketcap.com/static/img/coins/64x64/1.png",
"id": 1,
"name": "Bitcoin",
"symbol": "BTC",
"slug": "bitcoin",
"date_added": "2013-04-28T00:00:00.000Z",
"tags": [
"mineable"
],
"category": "coin"
}
}When trying to access the coin name, for example, I issue the command:
console.log(this.props.coin.BTC.name);
I get the error: Cannot read property 'BTC' of undefined
I tested accessing values in this object outside of React and I am able to access the different values. How would one access a nested object like this using React.
Thanks in advance.
import React, { Component } from "react";
import { fetchCoin } from "../redux/actions";
import { connect } from "react-redux";
class ViewCoin extends Component {
componentDidMount() {
this.props.fetchCoin(this.props.match.params.symbol);
}
render() {
console.log("Props:", this.props.coin);
return (
<div>
<h2>View Item Page</h2>
</div>
);
}
}
const mapStateToProps = state => {
return {
coin: state.coins.coin
};
};
export default connect(mapStateToProps, { fetchCoin })(ViewCoin);import React, { Component } from "react";
import { fetchCoin } from "../redux/actions";
import { connect } from "react-redux";
class ViewCoin extends Component {
componentDidMount() {
this.props.fetchCoin(this.props.match.params.symbol);
}
render() {
console.log("Props:", this.props.coin);
return (
<div>
<h2>View Item Page</h2>
</div>
);
}
}
const mapStateToProps = state => {
return {
coin: state.coins.coin
};
};
export default connect(mapStateToProps, { fetchCoin })(ViewCoin);{
"BTC": {
"urls": {
"website": [
"https://bitcoin.org/"
],
"twitter": ,
"reddit": [
"https://reddit.com/r/bitcoin"
],
"message_board": [
"https://bitcointalk.org"
],
"announcement": ,
"chat": ,
"explorer": [
"https://blockchain.info/",
"https://live.blockcypher.com/btc/",
"https://blockchair.com/bitcoin/blocks"
],
"source_code": [
"https://github.com/bitcoin/"
]
},
"logo": "https://s2.coinmarketcap.com/static/img/coins/64x64/1.png",
"id": 1,
"name": "Bitcoin",
"symbol": "BTC",
"slug": "bitcoin",
"date_added": "2013-04-28T00:00:00.000Z",
"tags": [
"mineable"
],
"category": "coin"
}
}{
"BTC": {
"urls": {
"website": [
"https://bitcoin.org/"
],
"twitter": ,
"reddit": [
"https://reddit.com/r/bitcoin"
],
"message_board": [
"https://bitcointalk.org"
],
"announcement": ,
"chat": ,
"explorer": [
"https://blockchain.info/",
"https://live.blockcypher.com/btc/",
"https://blockchair.com/bitcoin/blocks"
],
"source_code": [
"https://github.com/bitcoin/"
]
},
"logo": "https://s2.coinmarketcap.com/static/img/coins/64x64/1.png",
"id": 1,
"name": "Bitcoin",
"symbol": "BTC",
"slug": "bitcoin",
"date_added": "2013-04-28T00:00:00.000Z",
"tags": [
"mineable"
],
"category": "coin"
}
}javascript node.js reactjs
javascript node.js reactjs
asked Nov 21 at 1:40
Kareem Phillip-Jackson
205
asked Nov 21 at 1:40
Kareem Phillip-Jackson
205
asked Nov 21 at 1:40
Kareem Phillip-Jackson
205
asked Nov 21 at 1:40
Kareem Phillip-Jackson
205
asked Nov 21 at 1:40
Kareem Phillip-Jackson
205
205
looks fine, but you need a constructor.constructor(props){ super(props) }
– Ziyo
Nov 21 at 1:55
add a comment |
looks fine, but you need a constructor.constructor(props){ super(props) }
– Ziyo
Nov 21 at 1:55
looks fine, but you need a constructor.
constructor(props){ super(props) }– Ziyo
Nov 21 at 1:55
looks fine, but you need a constructor.
constructor(props){ super(props) }– Ziyo
Nov 21 at 1:55
add a comment |
1 Answer
1
active
oldest
votes
What's likely happening is the first time that component renders coin is undefined. When the action returns, the props are updated, the component re-renders and coin is logged out.
Do something like this in render and it should work:
this.props.coin && console.log('coin name:', this.props.coin.BTC.name)
answered Nov 21 at 2:22
jsw324
39818
This does work, thank you!
– Kareem Phillip-Jackson
Nov 22 at 16:10
glad to hear it!
– jsw324
Nov 24 at 12:29
add a comment |
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1 Answer
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1 Answer
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active
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oldest
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active
oldest
votes
What's likely happening is the first time that component renders coin is undefined. When the action returns, the props are updated, the component re-renders and coin is logged out.
Do something like this in render and it should work:
this.props.coin && console.log('coin name:', this.props.coin.BTC.name)
answered Nov 21 at 2:22
jsw324
39818
This does work, thank you!
– Kareem Phillip-Jackson
Nov 22 at 16:10
glad to hear it!
– jsw324
Nov 24 at 12:29
add a comment |
What's likely happening is the first time that component renders coin is undefined. When the action returns, the props are updated, the component re-renders and coin is logged out.
Do something like this in render and it should work:
this.props.coin && console.log('coin name:', this.props.coin.BTC.name)
answered Nov 21 at 2:22
jsw324
39818
This does work, thank you!
– Kareem Phillip-Jackson
Nov 22 at 16:10
glad to hear it!
– jsw324
Nov 24 at 12:29
add a comment |
What's likely happening is the first time that component renders coin is undefined. When the action returns, the props are updated, the component re-renders and coin is logged out.
Do something like this in render and it should work:
this.props.coin && console.log('coin name:', this.props.coin.BTC.name)
answered Nov 21 at 2:22
jsw324
39818
What's likely happening is the first time that component renders coin is undefined. When the action returns, the props are updated, the component re-renders and coin is logged out.
Do something like this in render and it should work:
this.props.coin && console.log('coin name:', this.props.coin.BTC.name)
answered Nov 21 at 2:22
jsw324
39818
answered Nov 21 at 2:22
jsw324
39818
answered Nov 21 at 2:22
jsw324
39818
answered Nov 21 at 2:22
jsw324
39818
39818
This does work, thank you!
– Kareem Phillip-Jackson
Nov 22 at 16:10
glad to hear it!
– jsw324
Nov 24 at 12:29
add a comment |
This does work, thank you!
– Kareem Phillip-Jackson
Nov 22 at 16:10
glad to hear it!
– jsw324
Nov 24 at 12:29
This does work, thank you!
– Kareem Phillip-Jackson
Nov 22 at 16:10
This does work, thank you!
– Kareem Phillip-Jackson
Nov 22 at 16:10
glad to hear it!
– jsw324
Nov 24 at 12:29
glad to hear it!
– jsw324
Nov 24 at 12:29
add a comment |
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looks fine, but you need a constructor.
constructor(props){ super(props) }– Ziyo
Nov 21 at 1:55