I am learning react and stumbled on something that seems like an absolute beginner problem. Anyway I am fetching data from an API and would like to know how to get a certain element from the JSON. I have tried different variations with [0] but with no success.
here is .json:
{
"data": [
{
"id": 68,
"name": "Umrah bersama Da'i Hadhari",
"duration": "12D10N",
"slug": "umrah-bersama-dai-hadhari-november-disember",
"type": "umrah",
"isPublished": true,
"isHighlighted": true,
"promoStatus": null,
"tourCode": null,
"displayName": "Umrah bersama Da'i Hadhari",
},
{
"id": 70,
"name": "Umrah bersama Da'i Fuad",
"duration": "12D10N",
"slug": "umrah-bersama-dai-fuad-2018",
"type": "umrah",
"isPublished": true,
"isHighlighted": true,
"promoStatus": null,
"tourCode": "UGOCT18-ECON",
"displayName": "Umrah bersama Da'i Fuad",
},
{
"id": 45,
"name": "Umrah Super Ekonomi - Disember",
"duration": "12D10N",
"slug": "ugdec18-umrah-disember-cuti-sekolah",
"type": "umrah",
"isPublished": true,
"isHighlighted": true,
"promoStatus": null,
"tourCode": "UGOCT18 - P/FB",
"displayName": "Umrah Super Ekonomi - Disember",
},
{
"id": 47,
"name": "Umrah Super Ekonomi - November",
"duration": "12D10N",
"slug": "ugnov18-p-fb-umrah-november-cuti-sekolah-musim-sejuk",
"type": "umrah",
"isPublished": true,
"isHighlighted": true,
"promoStatus": null,
"tourCode": "UGNOV18 - S.ECON",
"displayName": "Umrah Super Ekonomi - November",
},
]
}
here is my code:
class PackageDetails extends React.Component {
constructor (props) {
super (props);
this.state = {
data: [],
}
}
componentDidMount () {
fetch ('http://localhost/sampleData.json')
.then ((Response) => Response.json())
.then ((findresponse) => {
console.log(findresponse.data[0])
this.setState({
data:findresponse.data[0],
})
})
}
render () {
return (
<div>
<Navigation/>
<Breedcrumbs/>
<section className="section-highlight">
<div className="container">
{
this.state.data.map((dynamicData,i) =>
<ContentHighlight
name={dynamicData.name}
packageType={dynamicData.packageType}
highlight={dynamicData.highlight}
/>
)
}
</div>
</section>
</div>
)
}
}
export default PackageDetails;
I just want to access the the first set of the data. it's working on console.log but not on this.setState.
please help me on this. thanks
this.state.data.map iterates through an array. Since this.state.data is an object, please use it directly like so:
<ContentHighlight
name={this.state.data.name}
packageType={this.state.data.packageType}
highlight={this.state.data.highlight}
/>
Related
App.js
I am facing this issue file error - Uncaught TypeError: items.data.map is not a function. I have tried some other options but did not work. I cant seem to find what I am doing wrong.
.then((res) => res.json())
.then((json) => {
this.setState({
items: json,
DataisLoaded: true
});
})
}
render() {
const { DataisLoaded, items } = this.state;
if (!DataisLoaded) return <div>
<h1> Loading data ... </h1> </div> ;
return (
<div className = "App">
<h1> Fetch data from an api in react </h1> {
items.data.map((item) => (
<ol key = { item.data} >
Continents: {item.data[0]}
</ol>
))
}
</div>
);
}
}
export default App;
JSON Data
Nested API data from json data type.
{
"data": {
"data": [
{
"project_id": "xxxx",
"title": "xxx34",
"description": "xxx23",
"expense": 1699126,
"budget": 6418516,
"country": "xxx",
"sector": [
{
"name": "Accelerate structural transformations",
"code": "18"
}
],
"sdg": [
{
"name": "Peace, justice, and strong institutions",
"id": "16"
}
],
"signature_solution": [
{
"name": "Strengthen effective, inclusive and accountable governance",
"id": "2"
}
],
"donor": [
"Australian DFAT",
"GLOBAL FUND TO FIGHT AIDS, TUBERCULOSIS",
"UNITED NATIONS DEVELOPMENT PRO"
],
"marker": [
"Hows",
"Joint Programme",
"Partner",
"Whos",
"COVID-19 Response"
]
},
{
],
"links": {
"next": null,
"previous": null
},
"count": 44
},
"status": 200,
"success": true
}
I tried data.data.map but still facing the same error. What am I doing wrong here?
Firstly, the TypeError you got is syntax error. The implementation of an arrow function must follow by curly brackets
items.data.map((item) => (
<ol key = { item.data} >
Continents: {item.data[0]}
</ol>
))
to
items.data.map((item) => {
<ol key = { item.data} >
Continents: {item.data[0]}
</ol>
})
Secondly, items you are mapping is a nest of JSON object - key: value pair. It's not suitable for mapping.
The mapping iterator or iterating an array is perfect when used to retrieve
data from a sequence item have the same or similar structure.
E.g:
const arr = [{"id": "1", "name": "a"}, {"id": "2", "name": "b"}, {"id": "3", "name": "c"}];
arr.map((item) => {
console.log(item.id);
console.log(item.name);
})
You should pretreat your data first.
I have to map the nested JSON result in React. The below one is the response I got as response from backend API.
{
"id": 2,
"name": "sanjna",
"email": "vv#gmail.com",
"address": "iiiii, hhh",
"gender": "1",
"tagline": "Friendly to all",
"description": "4 years experience in programming",
"languages": "English ",
"key_skills": [
{
"id": 1,
"name": "RUBY ON RAILS, HTML, BOOTSTRAP, JQUERY, REACT",
"relevant_experience": "4"
},
{
"id": 2,
"name": "ruby",
"relevant_experience": "2"
}
],
"certifications": [
{
"id": 1,
"name": "MCA",
"institution_name": "vvv unversity",
"certification_date": "20-12-2020",
"image": null
},
{
"id": 2,
"name": "HTML training",
"institution_name": "nnn unversity",
"certification_date": "20-12-2022",
"image": null
}
],
"educations": [
{
"id": 1,
"qualification": "MCA",
"course": "Masters Degree PG",
"institute": "kkk",
"ins_location": "jjjj",
"passing_year": "2015"
}
]
}
This is my React code to get this response
const [singleUserDetail, setsingleUserDetail] = React.useState('');
let logged_user_id = job_seeker.actable_id;
const getsingleUserDetails = (logged_user_id) => {
axios
.get(`http://localhost:3001/users/${logged_user_id}`, { withCredentials: true })
.then((response) => {
const singleUserDetail = response.data;
setsingleUserDetail(response.data)
console.log(response.data); //prints the above JSON results in console
})
.catch((error) => {
console.log(" error", error);
});
};
React.useEffect(() => {
getsingleUserDetails(logged_user_id);
}, [logged_user_id]);
When I prints {singleUserDetail.name} it gives me result sanjna
{singleUserDetail.email} it gives me result vvv#gmail.com
{singleUserDetail. address} it gives me result iiiii, hhh. from my above JSON result
But how to print keyskills, certifications and educations here with mapping. I'm a beginner in React.
Youu can do something like this, my example is very simple,but you can complicate this as much as you need, with conditions or loops in loops.
<div>
{singleUserDetail.name},{singleUserDetail.email},{singleUserDetail.address},{singleUserDetail.gender},{singleUserDetail.tagline},{singleUserDetail.description}, {singleUserDetail.languages}
</div>
{singleUserDetail.key_skills.map((skill)=>{
return(
<div key={skill.id}>
{skill.name}:{skill.relevant_experience}
</div>
);
})}
{singleUserDetail.certifications.map((certification)=>{
return(
<div key={certification.id}>
{certification.name},{certification.institution_name},{certification.certification_date}
</div>
);
})}
{singleUserDetail.educations.map((education)=>{
return(
<div key={education.id}>
{education.qualification},{education.course},{education.institute}
</div>
);
})}
For more information, React documentation
I'm trying to create a slide show (2-3 images) using the Alexa authoring tool.I have managed to do this using the APL Pager which displays a series of components one at a time. The thing is that in order to switch from image A to image B..C I have to touch the screen and swipe left/right.
i want to make this happen automatically and have alexa swicth the images within a certain time, and it seems that this can be achieved using APL autopage but for some reason this is not working 😩
What I've done
Set up the APL using the APL pager
Added the auto page to the APL document
Component Id
duration
delay
After trying the simulation and directly in an echo show 5 it still only triggers when the display is touched.
Also tried:
Adding the standard command (auto pager) directly in the handler of alexa but same response.
Some doubts
Does it matter if i put the commands in the APLdocument.json[1] file or directly in the handler when i call .addDirective[2]..the only difference i see if i want the content or duration to be dynamic i should put it directly in the backend code(index.js) right?
[1]
{
"type": "APL",
"version": "1.4",
"settings": {},
"theme": "light",
"import": [],
"resources": [],
"styles": {},
"onMount": [],
"graphics": {},
"commands": [
{
"type": "AutoPage",
"componentId": "fisrtpager",
"duration": 1000,
"delay": 500
}
],
[2]
handlerInput.responseBuilder.addDirective({
type: 'Alexa.Presentation.APL.RenderDocument',
token:'arrugas',
document: physiolift,
commands: [{
"type": "AutoPage",
"componentId": "fisrtpager",
"duration": 1000,
"delay": 500
}]
});
}
Expected outPut
Have Alexa (echo show 5) to display a series of images like a carousel (without the need to touch the screen)
My code
APL Document
{
"type":"APL",
"version":"1.4",
"settings":{
},
"theme":"light",
"import":[
],
"resources":[
],
"styles":{
},
"onMount":[
],
"graphics":{
},
"commands":[
{
"type":"AutoPage",
"componentId":"fisrtpager",
"duration":1000,
"delay":500
}
],
"layouts":{
},
"mainTemplate":{
"parameters":[
"payload"
],
"items":[
{
"type":"Pager",
"id":"fisrtpager",
"width":"100%",
"height":"100%",
"items":[
{
"type":"Image",
"width":"100%",
"height":"100%",
"scale":"best-fill",
"source":"https://dyl80ryjxr1ke.cloudfront.net/external_assets/hero_examples/hair_beach_v1785392215/original.jpeg",
"align":"center"
},
{
"type":"Image",
"width":"100%",
"height":"100%",
"source":"https://interactive-examples.mdn.mozilla.net/media/cc0-images/grapefruit-slice-332-332.jpg",
"scale":"best-fill"
},
{
"type":"Text",
"text":"Just text content shown on page #3",
"textAlign":"center"
}
],
"navigation":"wrap"
}
]
}
}
index.js
// somewhere inside the intent im invoking
if (Alexa.getSupportedInterfaces(handlerInput.requestEnvelope)['Alexa.Presentation.APL']) {
// Create Render Directive.
handlerInput.responseBuilder.addDirective({
type: 'Alexa.Presentation.APL.RenderDocument',
token:'arrugas',
document: require('./documents/ImageTest.json')
});
}
speakOutput += ' just saying somthing'
return handlerInput.responseBuilder
.speak(speakOutput)
.reprompt('just saying something else')
.getResponse();
Just add the command in the "onMount" event handler. Here is the modified code which does exactly what you need:
{
"type": "APL",
"version": "1.4",
"settings": {},
"theme": "light",
"import": [],
"resources": [],
"styles": {},
"onMount": [],
"graphics": {},
"layouts": {},
"mainTemplate": {
"parameters": [
"payload"
],
"items": [
{
"type": "Pager",
"id": "fisrtpager",
"width": "100%",
"height": "100%",
"items": [
{
"type": "Image",
"width": "100%",
"height": "100%",
"scale": "best-fill",
"source": "https://dyl80ryjxr1ke.cloudfront.net/external_assets/hero_examples/hair_beach_v1785392215/original.jpeg",
"align": "center"
},
{
"type": "Image",
"width": "100%",
"height": "100%",
"source": "https://interactive-examples.mdn.mozilla.net/media/cc0-images/grapefruit-slice-332-332.jpg",
"scale": "best-fill"
},
{
"type": "Text",
"text": "Just text content shown on page #3",
"textAlign": "center"
}
],
"navigation": "none",
"onMount": [{
"type": "AutoPage",
"componentId": "fisrtpager",
"duration": 1000,
"delay": 500
}]
}
]
}
}
to update dynamically this feature from your backend code you can do the following:
// check if device supports APL
if (Alexa.getSupportedInterfaces(handlerInput.requestEnvelope)['Alexa.Presentation.APL']) {
// Create Render Directive.
handlerInput.responseBuilder.addDirective({
type: 'Alexa.Presentation.APL.RenderDocument',
token: "dialogManagementPagerDoc",
document: require('./PATH-TO/YOUR-APL-FILE.json')
})
.addDirective({
type: "Alexa.Presentation.APL.ExecuteCommands",
token: "dialogManagementPagerDoc",
commands: [
{
type: "AutoPage",
componentId: "YOUR_PAGER_ID",
delay: 1000,
duration: 5000
}
]
});
}
When I am trying the console log the state its saying Undefined.. I also placed the JSON file.
I have posted the endpoint json file here. I believe there is an issue while hooking up json.
When I am trying the console log the state its saying Undefined.. I also placed the JSON file.
I have posted the endpoint json file here. I believe there is an issue while hooking up json.
class App extends Component {
state = {
content: [{ coord: "" }, { base: "" }]
};
componentDidMount() {
axios
.get(
"https://api.openweathermap.org/data/2.5/weather?q=berlin&appid=240ef553958220e0d857212bc790cd14"
)
.then(res => {
this.setState({
content: [
{
coord: res.data.coord
},
{ base: res.data.base }
]
});
});
}
render() {
console.log(this.state.content.coord);
return (
<div className="App center">
<h2 className="blue-text">Weather App</h2>
<div></div>
<Weather />
</div>
);
}
}
export default App;
JSON endpoint goes here....
{
"coord": {
"lon": 13.41,
"lat": 52.52
},
"weather": [
{
"id": 803,
"main": "Clouds",
"description": "broken clouds",
"icon": "04n"
}
],
"base": "stations",
"main": {
"temp": 276.88,
"feels_like": 268.47,
"temp_min": 275.37,
"temp_max": 278.15,
"pressure": 994,
"humidity": 80
},
"visibility": 10000,
"wind": {
"speed": 9.3,
"deg": 240,
"gust": 14.4
},
"clouds": {
"all": 75
},
"dt": 1580260557,
"sys": {
"type": 1,
"id": 1275,
"country": "DE",
"sunrise": 1580280826,
"sunset": 1580312685
},
"timezone": 3600,
"id": 2950159,
"name": "Berlin",
"cod": 200
}
As content is an array type you can access coord or base directly. Instead change it to an object or access it based on array index like this.
this.state.content[0].coord / this.state.content[1].base
If you change content to object type you can access coord or base directly as i did it here
sample code:
state = {
content: { coord: "", base: "" }
};
after request fetch you can update state something like this.
this.setState({
content: { coord: res.data.coord, base: res.data.base }
});
You can make your state look like below which make reading and accessing the data easier.
state = {
content: {
coord: "",
base: "",
},
}
and your setState like below:
this.setState({
content: {
coord: res.data.coord,
base: res.data.base
}
})
Im trying to access data from an API and render the results. Im storing each object in a separate state and im trying to map through each state, however this throws the following Error.
My code is:
state = {
events: [],
items: [],
isLoading: true
}
// fetchData = () => {
componentDidMount() {
const url = 'http://www.mocky.io/v2/5c8673f0340000981789c0da'
axios.get(url).then(response => {
this.setState({ items: response.data, isLoading: false, events: response.data[0] })
console.log(this.state.events)
})
}
render() {
return(
<div>
<div>
<h1>26/2</h1>
<ul>
{ this.state.events.map(event => (<li>{event.activity}</li>)) }
</ul>
</div>
<div>
<h1>27/2</h1>
<ul>
</ul>
</div>
</div>
)
}
}
API structure:
[
{
"id": 1,
"activity": "lunch",
"startDate": "2019-02-26 12:00",
"endDate": "2019-02-26 13:00",
"location": "Lagerhuset"
},
{
"id": 2,
"activity": "meeting",
"startDate": "2019-02-26 22:00",
"endDate": "2019-02-27 07:00",
"location": "online"
},
{
"id": 3,
"activity": "meeting",
"startDate": "2019-02-26 10:00",
"endDate": "2019-02-26 12:00",
"location": "Lagerhuset"
}
]
Now im wondering if what I'm trying to achieve even is possible? And if so, what am I doing wrong? Thanks.
items contain the array of items. events just contain the first item which is an object. Hence the map fails.
Either use :
{this.state.items.map(event => (
<li>{event.activity}</li>
))}
or this :
<li>{this.state.events.activity}</li>