So as part of my project I'm trying to ammend this boilerplate of React-Pdf-Highlighter to accept pdf highlights from flask-api instead of a local file( the example came with a local/json import) ..
I have tried to check with console.log the fetch is not the problem, but I feel for somereason the 'testHighlights' state is not what it should be .
<<App.js>>
// #flow
/* eslint import/no-webpack-loader-syntax: 0 */
import React, { Component } from "react";
import PDFWorker from "worker-loader!pdfjs-dist/lib/pdf.worker";
import {
PdfLoader,
PdfHighlighter,
Tip,
Highlight,
Popup,
AreaHighlight,
setPdfWorker
} from "react-pdf-highlighter";
import Spinner from "./Spinner";
import Sidebar from "./Sidebar";
import testHighlights from "./test-highlights";
import type {
T_Highlight,
T_NewHighlight
} from "react-pdf-highlighter/src/types";
import "./style/App.css";
setPdfWorker(PDFWorker);
type Props = {};
type State = {
url: string,
highlights: Array<T_Highlight>
};
const getNextId = () => String(Math.random()).slice(2);
const parseIdFromHash = () =>
document.location.hash.slice("#highlight-".length);
const resetHash = () => {
document.location.hash = "";
};
const HighlightPopup = ({ comment }) =>
comment.text ? (
<div className="Highlight__popup">
{comment.emoji} {comment.text}
</div>
) : null;
const PRIMARY_PDF_URL = "https://arxiv.org/pdf/1708.08021.pdf";
const SECONDARY_PDF_URL = "https://arxiv.org/pdf/1604.02480.pdf";
const searchParams = new URLSearchParams(document.location.search);
const initialUrl = searchParams.get("url") || PRIMARY_PDF_URL;
class App extends Component<Props, State> {
state = {
url: initialUrl,
highlights: testHighlights[initialUrl]
? [...testHighlights[initialUrl]]
: []
};
state: State;
resetHighlights = () => {
this.setState({
highlights: []
});
};
toggleDocument = () => {
const newUrl =
this.state.url === PRIMARY_PDF_URL ? SECONDARY_PDF_URL : PRIMARY_PDF_URL;
this.setState({
url: newUrl,
highlights: testHighlights[newUrl] ? [...testHighlights[newUrl]] : []
});
};
scrollViewerTo = (highlight: any) => {};
scrollToHighlightFromHash = () => {
const highlight = this.getHighlightById(parseIdFromHash());
if (highlight) {
this.scrollViewerTo(highlight);
}
};
componentDidMount() {
window.addEventListener(
"hashchange",
this.scrollToHighlightFromHash,
false
);
}
getHighlightById(id: string) {
const { highlights } = this.state;
return highlights.find(highlight => highlight.id === id);
}
addHighlight(highlight: T_NewHighlight) {
const { highlights } = this.state;
console.log("Saving highlight", highlight);
this.setState({
highlights: [{ ...highlight, id: getNextId() }, ...highlights]
});
}
updateHighlight(highlightId: string, position: Object, content: Object) {
console.log("Updating highlight", highlightId, position, content);
this.setState({
highlights: this.state.highlights.map(h => {
const {
id,
position: originalPosition,
content: originalContent,
...rest
} = h;
return id === highlightId
? {
id,
position: { ...originalPosition, ...position },
content: { ...originalContent, ...content },
...rest
}
: h;
})
});
}
render() {
const { url, highlights } = this.state;
return (
<div className="App" style={{ display: "flex", height: "100vh" }}>
<Sidebar
highlights={highlights}
resetHighlights={this.resetHighlights}
toggleDocument={this.toggleDocument}
/>
<div
style={{
height: "100vh",
width: "75vw",
position: "relative"
}}
>
<PdfLoader url={url} beforeLoad={<Spinner />}>
{pdfDocument => (
<PdfHighlighter
pdfDocument={pdfDocument}
enableAreaSelection={event => event.altKey}
onScrollChange={resetHash}
// pdfScaleValue="page-width"
scrollRef={scrollTo => {
this.scrollViewerTo = scrollTo;
this.scrollToHighlightFromHash();
}}
onSelectionFinished={(
position,
content,
hideTipAndSelection,
transformSelection
) => (
<Tip
onOpen={transformSelection}
onConfirm={comment => {
this.addHighlight({ content, position, comment });
hideTipAndSelection();
}}
/>
)}
highlightTransform={(
highlight,
index,
setTip,
hideTip,
viewportToScaled,
screenshot,
isScrolledTo
) => {
const isTextHighlight = !Boolean(
highlight.content && highlight.content.image
);
const component = isTextHighlight ? (
<Highlight
isScrolledTo={isScrolledTo}
position={highlight.position}
comment={highlight.comment}
/>
) : (
<AreaHighlight
highlight={highlight}
onChange={boundingRect => {
this.updateHighlight(
highlight.id,
{ boundingRect: viewportToScaled(boundingRect) },
{ image: screenshot(boundingRect) }
);
}}
/>
);
return (
<Popup
popupContent={<HighlightPopup {...highlight} />}
onMouseOver={popupContent =>
setTip(highlight, highlight => popupContent)
}
onMouseOut={hideTip}
key={index}
children={component}
/>
);
}}
highlights={highlights}
/>
)}
</PdfLoader>
</div>
</div>
);
}
}
export default App;
<<test-highlights.js >>
const testHighlights =async () => {
const res= await fetch('http://127.0.0.1:5000/jsonapi')
const data =await res.json()
console.log(data)
this.state.testHighlights = data
return testHighlights;
}
export default testHighlights;
You can't assign state like this
this.state.testHighlights = data
You must use this.setState function to do it
this.setState({ testHighlights: data });
That is why your testHighlights state isn't what you was expected
Related
I am trying to download the JSON. React Native is downloading the json but I am not sure why Flatlist is not displaying the items. If I change the data={dummyData} in flatlist to data={MyList} then, the flatlist is able to display.
let viewableItemsChanged = null;
const dummyData = GrabData('http://hunterdata.serveblog.net/10record.json');
const MyList = [
{"id":"0","title":"MyBook0","url":"URLBook-0","image":"image-0" },
{"id":"1","title":"MyBook1","url":"URLBook-1","image":"image-1" },
{"id":"2","title":"MyBook2","url":"URLBook-2","image":"image-2" },
{"id":"3","title":"MyBook3","url":"URLBook-3","image":"image-3" },
{"id":"4","title":"MyBook4","url":"URLBook-4","image":"image-4" },
{"id":"5","title":"MyBook5","url":"URLBook-5","image":"image-5" }];
async function GrabData(TheURL) {
let abc = [];
try {
let response = await fetch(TheURL, {headers: {'Cache-Control' : 'no-cache'}});
let responseJson = await response.json();
console.log(responseJson);
return responseJson;
} catch (error) {
console.error(error);
}
}
const renderItem = ({item}) => {
return <View><Text>{item.title}</Text></View>
}
const List = () => {
return (
<FlatList
style={styles.list}
data={dummyData}
renderItem={renderItem}
/>
)
};
there is an issue with your code. you are calling the async function without await keyword. so it returns undefine response like this. {"_U": 0, "_V": 0, "_W": null, "_X": null}
Please Try this solution.
import React, { useEffect , useState } from 'react';
import { SafeAreaView, View, FlatList, StyleSheet, Text, StatusBar } from 'react-native';
const Item = ({ title }) => (
<View style={styles.item}>
<Text style={styles.title}>{title}</Text>
</View>
);
const App = () => {
const [data, setData] = useState([])
useEffect(() => {
apicall();
},[])
const apicall = async () => {
let dd = await GrabData("http://hunterdata.serveblog.net/10record.json");
setData(dd)
}
const GrabData = async (TheURL) => {
try {
let response = await fetch(TheURL, {headers: {'Cache-Control' : 'no-cache'}});
let responseJson = await response.json();
return responseJson;
} catch (error) {
console.error(error);
}
}
const renderItem = ({ item }) => (
<Item title={item?.title} />
);
return (
<SafeAreaView style={styles.container}>
<FlatList
data={data}
renderItem={renderItem}
keyExtractor={item => item?.id}
/>
</SafeAreaView>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
marginTop: StatusBar.currentHeight || 0,
},
item: {
backgroundColor: '#f9c2ff',
padding: 20,
marginVertical: 8,
marginHorizontal: 16,
},
title: {
fontSize: 32,
},
});
export default App;
You should activate the functions in componentDidMount also try states instead of const
Why am I asking this question (main return) is finsied, but board.writer is not drawing. how can i drawing this object
if my question is wrong way plz tell me . i will fix it
i tried this way
first use map function
make like this function renderUser = ({board_SEQ, content, writer,subject}) => { parameter}
const Home = () => {
const initboard = {
board_SEQ: '',
writer: '',
content: '',
subject: ''
};
const [boards, setBoard] = useState([]);
const load = () => {
axios.get('http://www.heon.shop:8080/api/boards')
.then((res) => {
const data = res.data;
setBoard(boards => [...boards, {
board_SEQ: (data[0].board_SEQ),
writer: data[0].writer,
content: data[0].content,
subject: data[0].subject
}]);
})
.catch((error) => {
console.log("error" + error);
}
);
}
useEffect(() => {
load();
console.log("useEffect");
}, []);
const renderUser = ({board_SEQ, content, writer, subject}) => {
return (
<div>
<li>he</li>
<li>{board_SEQ}</li>
<li>{content}</li>
<li>{writer}</li>
<li>{subject}</li>
</div>
);
}
return (
<div>
{boards.map(board => {
<h1> {board.writer}</h1>
})}
</div>
);
}
export default Home;
Maybe you can try like this,
<div>
{boards.map(board => renderUser(board)}
</div>
if you want to render item directly using (add return to the map):
<div>
{boards.map(board => {
return <h1> {board.writer}</h1>;
})}
</div>
I'm using functional component and I'm getting JSOS object from local file And in component I'm setting that JSON in some state.
After that few object I spliced(deleted) from that setState. But again in onchange function I want all the JSON object but here I'm getting updated json means few are deleted, Is there any method I can store all JSON object in some place? can anybody help me in this.
const StudyDetails = () => {
const [supplyPlan, setSupplyPlan] = useState([]);
const getSupplyPlanDetails = useCallback(
async () => {
try {
const payload = {
studyName: studyDetails?.studyName
? studyDetails?.studyName
: query.get("name"),
country: [],
depot: [],
material: [],
site: [],
inTransientMaterial,
};
const res = await getSupplyPlan(payload);
//setSupplyPlan(res);
console.log(res)
// setSupplyPlan(supplyData)
} catch (err) {
setSupplyPlan([]);
}
},
// eslint-disable-next-line react-hooks/exhaustive-deps
[]
);
useEffect(() => {
getSupplyPlanDetails();
}, [ getSupplyPlanDetails]);
const onChange = (e) => {debugger
console.log(supplyData)
}
return (
<div>
<Checkbox
onChange={onChange}
>
In Transit
</Checkbox>
{supplyPlan?.map((item, index) => (
<Fragment key={index}>
<SupplyChain item={item} />
<Divider className="supply-chain-divider" />
</Fragment>
))}
</div>
)
}
I'm splicing few object in supplyChain component:
const SupplyChain = ({ item }) => {
useEffect(() => {
let data = [];
if (item && item.inTransit.length != 1) {
item &&
item.inTransit &&
item.inTransit.length > 0 &&
item.inTransit.map((intrans, index) => {
if (
intrans.from === item.depots?.packagingDepot?.[0]?.depotName &&
intrans.to === "sites"
) {
let directPath = item.inTransit.splice(index, 1);
setDirectSite(directPath);
}
setFilterJson(item.inTransit);
// eslint-disable-next-line react-hooks/exhaustive-deps
item = { ...item, filterJson: item.inTransit };
});
}
}
So if again when I click on onchange function I want all objects of JSON.
please someone help me in this
I'm trying to access to Begin and End inside JSON data but I can't. It just accesses and prints JSON data.
How can I print the Begin and End in separately FlatList?
Here is my code :
manage = date => {
this.setState({status: true})
this.setState({date:date})
const office_id=this.state.office_id;
const duration=this.state.duration;
const url='http://MyIP/api/timeApi';
axios.post(url,{office_id,date,duration})
.then(resp => this.setState({
testArray : JSON.stringify(resp.data),
}))
.catch(e)
{
alert(e);
}}
testFunction = () => {
var x = this.state.testArray;
return(
<Text>{x}</Text>
)
}
<DatePicker
date={this.state.date}
onDateChange={this.manage.bind(this) } />
in return
{
this.state.status ? <View>
<FlatList
data={this.state.testArray}
renderItem={this.testFunction}
/>
</View> : null
}
and here is my result
you need something like this , try to change it based on your code
import React, { Component } from 'react';
import {Text, View, FlatList ,Button} from 'react-native';
export default class Test extends Component {
constructor() {
super();
this.state = {
data: ['one', 'two', 'three', 'four', 'five'],
}
}
_keyExtractor = (item, index) => index.toString();
_renderItem = ({ item }) => (
<View>
<Text>{item}</Text>
</View>
);
manage = () => {
var x = this.firstAndLast(this.state.data);
this.setState({
data : x
})
}
firstAndLast(myArray) {
var firstItem = myArray[0];
var lastItem = myArray[myArray.length-1];
var newArray = [];
newArray.push(firstItem);
newArray.push(lastItem);
return newArray;
}
render() {
return (
<View>
<FlatList
data={this.state.data}
extraData={this.state}
keyExtractor={this._keyExtractor}
renderItem={this._renderItem}
/>
<Button title="click" onPress={() => this.manage()} />
</View>
);
}
}
I'm new with React and i'm trying to render a json from a websocket.
Right now i'm able to get the json from the websocket using this :
componentWillMount() {
this.ws = new WebSocket('ws://10.77.0.79:1234')
this.ws.onmessage = e => this.setState({data: Object.values((e.data))})
this.ws.onerror = e => this.setState({ error: 'WebSocket error' })
this.ws.onclose = e => !e.wasClean && this.setState({ error: `WebSocket error: ${e.code} ${e.reason}` })
}
And then i need to map this json, right now i'm using this:
render() {
// this is my json from websocket
var json2 = {"Auth":{"status":"true","user":"gesplan","pass":"root"}}
var arr = [];
Object.keys(json2).forEach(function(key) {
arr.push(json2[key]);
});
return <ul>{arr.map(item => <MyAppChild key={item.status} label={item.status} value={item.user} pass={item.pass} />)} {this.state.data} </ul>;
}
}
class MyAppChild extends React.Component {
render() {
return <li>{this.props.label + " - " + this.props.value + this.props.pass } </li>;
}
}
With this i can render the values of the var json2.
How can i do it with my this.state.data? when i change json2 for this.state.data it return a null, but how can the state be null if i am rendering it normally?
Set your initial state to an empty array first. Append data when new data comes in:
constructor() {
this.state = {
data: []
}
}
componentWillMount() {
this.ws = new WebSocket('ws://10.77.0.79:1234')
this.ws.onmessage = e => this.setState({
data: [].concat(this.state.data, JSON.parse(e.data).Auth)
})
this.ws.onerror = e => this.setState({ error: 'WebSocket error' })
this.ws.onclose = e => !e.wasClean && this.setState({ error: `WebSocket error: ${e.code} ${e.reason}` })
}
render() {
return (
<ul>
{this.state.data.map(item =>
<MyAppChild key={item.status} label={item.status} value={item.user} pass={item.pass} />)
}
</ul>
);
}