I've asked this before but simplifying the question. I have a JSON with geo-coordinates that I'd like to map in d3/leaflet:
Here's the structure, when console.logging the JSON allSFEvents:
(36) [{…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}]
And digging into one item:
#context: "http://schema.org"
#type: "MusicEvent"
endDate: "2019-01-27"
image: ""
location:
#type: "Place"
address: "San Francisco, CA"
geo:
#type: "GeoCoordinates"
latitude: 37.775
longitude: -122.4183333
__proto__: Object
name: "Natoma Cabana"
__proto__: Object
name: "Winter Olympics"
performer: {url: "https://www.bandsintown.com/a/217960-
winter-olympics?came_from=244", image: "", #type:
"MusicGroup", name: "Winter Olympics"}
startDate: "2019-01-27"
url: "https://www.bandsintown.com/e/1013280443-winter-olympics-at-natoma-cabana?came_from=244"
__proto__: Object
When I try to convert to latLong coordinates:
allSFEvents.forEach(function(d) {
d.latLong = new L.LatLng(allSFEvents.location.geo[0],//first position is latitude
allSFEvents.location.geo[1];//second position is longitude
console.log(d.latLong)
})
It gives me an error saying:
Cannot read property 'geo' of undefined
How do I loop through each item and run the L/.LatLong here? I seem to be stuck. The goal is to get distinct lat/long pairs for each item, in order to map it. Thanks in advance.
the forEach-function goes thru every element of your list and the parameter of the function is the one item of the list. So d is one item of your allSFEvents-Array.
https://www.w3schools.com/jsref/jsref_forEach.asp
So try the following:
allSFEvents.forEach(function(d) {
//here replace allSFEEvents with d then location should be set. And replace geo[0] with geo.latitude and geo[1] with geo.longitude because geo is not an array
d.latLong = new L.LatLng(d.location.geo.latitude,//first position is latitude
d.location.geo.longitude;//second position is longitude
console.log(d.latLong)
})
Related
I'm reading data in from an API and I'm trying to have the elements in the data array show up in a select tag in HTML using React, but it keeps telling me that the data is not an array even though it seems like it is when I do console.log.
render(){
console.log(this.state.countries.Countries)
return(
<div className = "tables-container">
<h1>Tables</h1>
<label>Please Select a Country to view data for: </label>
<select name = "countries" id = "countries">
<option selected = "selected">Select a Country</option>
{
this.state.countries.Countries.map((data)=>(
<option>{data.Country}</option>
))
}
</select>
</div>
)
}
When I run this, it says "TypeError: Cannot read property 'map' of undefined." The console.log result reads
(188) [{…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, …]
so I'm pretty sure this.state.countries.Countries should be an Array, so the map function should work, but it doesn't.
In my constructor I have
this.state = {
countries: [],
}
and I have the API fetch in
componentDidMount(){
fetch("https://api.covid19api.com/summary")
.then((data) => data.json())
.then((data) => {
this.setState({
countries: data
})
})
}
I've been stuck on this for an hour now I really need help figuring it out. Thanks!
this.state = {
countries: [],
}
this.state.countries starts off as an empty array. It has no .Countries property on it, so for your first render, this.state.countries.Countries is undefined, and you can't map undefined.
You need your state to have the same shape before and after you load data. So if you want the .countries.Countries nesting, change your initial state to this:
this.state = {
countries: {
Countries: []
}
}
If you just want one level of nesting, keep your initial values and change the following:
// In componentDidMount
this.setState({
countries: data.Countries
})
// In render
this.state.countries.map(
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I'm trying to map over my API to get the nodes.
Here is the format my API is in:
[
{
"agent": "....",
"managementDomain": "...",
"node": "..."
},
{
"agent": "....",
"managementDomain": "...",
"node": "..."
},
...
]
The format I need to get it into for react-select:
const colourOptions = [
{ value: 'orange', label: 'Orange' },
{ value: 'yellow', label: 'Yellow' },
{ value: 'green', label: 'Green' },
];
How I am mapping over it (using Redux for state management):
const alarms = this.props.dataReducer.alarmDetails
const {test} = alarms.map(alarm => ({value:alarm.node, label: alarm.node}))
The error I am getting:
TypeError: Cannot read property 'node' of null
console.log(this.props.dataReducer.alarmDetails)
(288) [{…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, null, {…}, {…}, {…}, {…}, null, {…}, {…}, null, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, null, null, null, {…}, {…}, {…}, {…}, {…}, null, {…}, {…}, {…}, {…}, {…}, {…}, …]
[0 … 99]
0:
agent: "..."
managementDomain: null
node: "..."
What's the best way to map over the API to get the node from each object within the array?
This error is actually self explanatory. Your map code is alright. Problem seem to exist that some of the objects in array is null or empty, so when javascript is trying to find node property on that object, its hitting the rock.
Actually this.props.dataReducer.alarmDetails this data contains null value, something like..
[
{
"agent": "....",
"managementDomain": "...",
"node": "..."
},
{
"agent": "....",
"managementDomain": "...",
"node": "..."
},
null
...
]
So, maybe you can filter the null values:
this.props.dataReducer.alarmDetails.filter(data=>data)
and put map code here
this.props.dataReducer.alarmDetails.filter(data=>data).map(d => ({value:d.node, label: d.node}))
You can return something like this:
import React from "react";
import ReactDOM from "react-dom";
import Select from "react-select";
import "./styles.css";
const alarms = [
{ agent: 1, managementDomain: null, node: "node1" },
{ agent: 2, managementDomain: null, node: "node2" }
];
let teamsFromApi = alarms.map(team => { return {value: team.agent, label: team.node} });
function App() {
return (
<div className="App">
<Select options={teamsFromApi} />
</div>
);
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
Note: Replace node data.
You can check the example Codebox
I have 4 arrays full of objects:
Array(16) [ {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, … ]
Array(27) [ {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, … ]
Array(21) [ {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, … ]
Array(16) [ {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, … ]
Each object contains a bit of information, that I want to display to the viewer:
0: Object { exchange: "NYSE", quote: "JPY", price: "3923.76016", … }
1: Object { exchange: "DEF", quote: "GBP", price: "3924.60972", … }
2: Object { exchange: "FEG", quote: "EUR", price: "3917.31980", … }
3: {…}
exchange: "NEX"
price: "3914.70000"
quote: "USD"
timestamp: "2018-12-31T07:47:11.253Z"
<prototype>: Object { … }
How can I
1) Assign a unique value to the array, ie. Array #1 is VTX, Array #2 is DEF, so that when I display it on the page, I don't need to change the ticker symbol (ie. VTX on exchange NEX is $100, and I only need to change the exchange name and currency/amount)
2) iterate over the arrays to where the iterator moves on to the next object in the array, let's say, every 2-3 seconds?
I'm doing this in React and have passed the data on to props, but now I'm stuck trying to figure this out.
1) You can store all your arrays in on object like this :
const myArrays = [
{
uniqueName: 'VTX',
infos: []
},{
uniqueName: 'DEF',
infos: []
}
]
2) You should store the index in the state, and make it change with setInterval in componentDidMount
componentDidMount() {
this.timerID = setInterval(
() => this.nextInfo(),
1000
);
}
I'm using eventbrite/eventbrite-sdk-javascript for my project. Everything is working fine but the response is giving me back only 50 events
Object
events
:
(50) [{…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}]
pagination
:
{object_count: 58205, page_number: 1, page_size: 50, page_count: 200, has_more_items: true}
How can I see all events?
The responses when fetching events using eventbrite's api are paginated, with a max of 50 results per page and a max of 200 pages. What you did was fetch the first (let's call it n) page. Now you have to call the api once more, and provide the page=n+1. This will give you the next 50 events.
Hope this helps!
I want to apply filter like
this.Grid.option("dataSource").filter(x => x.Placeholder != null)
but it is not working
when I do
console.log(this.Grid.option("dataSource"));
I get
(72) [{…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, ob: Observer]
0:
{ob: Observer}
1:
Placeholder
:
(...)
PlaceholderDescr
:
(...)
RecordID
:
(...)
ob
:
Observer {value: {…}, dep: Dep, vmCount: 0}
get Placeholder
:
ƒ reactiveGetter()
set Placeholder
:
ƒ reactiveSetter(newVal)
get PlaceholderDescr
:
ƒ reactiveGetter()
set PlaceholderDescr
:
ƒ reactiveSetter(newVal)
get RecordID
:
ƒ reactiveGetter()
set RecordID
:
ƒ reactiveSetter(newVal)
proto
:
Object
2
:
{ob: Observer}
Get DataSource instance via ds = this.Grid.getDataSource() (documentation)
Then you can filter ds via ds.filter(expr) method. For more information, you can inspect this topic