Speak now
Please Wait Image Converting Into Text...
Embark on a journey of knowledge! Take the quiz and earn valuable credits.
Challenge yourself and boost your learning! Start the quiz now to earn credits.
Unlock your potential! Begin the quiz, answer questions, and accumulate credits along the way.
General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
Turn Your Knowledge into Earnings.
I want to move multiple markers on the google map when I get the latitude and longitude from MongoDB. I'm always getting updated latitude and longitude from db, but my markers are not moving, and after refreshing the page, the markers positions are changing, but I need to do it without refreshing the page.
This is my code`
class Maps extends React.Component { constructor(props){ super(props); this.state = { dronePosition: [] }; var _this = this; const config = { headers: { "Authorization" : `Bearer ${localStorage.getItem('token')}`, } }; // If I'm using setInterval, the markers are not showing at all. That's why here I call the getAllDrones() function // setInterval(function(){ axios.get(packages.proxy+'drones/getAllDrones',config) .then(res => { //Here I'm always getting updated positions for markers from backend. _this.state.dronePosition = []; res.data.forEach( function(element) { if(element.userId == localStorage.getItem("user_https://forum.tuteehub.com/tag/id">id")){ _this.state.dronePosition.push({https://forum.tuteehub.com/tag/id">id: element._https://forum.tuteehub.com/tag/id">id, latitude: element.latitude, longitude: element.longitude, photo: "http://maps.google.com/mapfiles/ms/icons/red-dot.png"}) } else{ _this.state.dronePosition.push({https://forum.tuteehub.com/tag/id">id: element._https://forum.tuteehub.com/tag/id">id, latitude: element.latitude, longitude: element.longitude, photo: "http://maps.google.com/mapfiles/ms/icons/blue-dot.png"}) } }); _this.getAllDrones(); }) // }, 2000) } getAllDrones(){ var _this = this; const config = { headers: { "Authorization" : `Bearer ${localStorage.getItem('token')}`, } }; axios.get(packages.proxy+'drones/getAllDrones',config) .then(res => { _this.state.dronePosition = []; res.data REPLY 0 views 0 likes 0 shares Facebook Twitter Linked In WhatsApp
If you want the markers to update without a refresh of the page you need to add them to the component state. Since I don't have access to your mongo-db I've used a dummy api just for demo purpose.
And when making api-calls they should be used in Lifecycle-method componentDidMount, not in the constructor.
I've left out the if-statement for local storage and element.userID since I don't know what that is and the component since I don't have access to it.
import React from "react"; import axios from "axios"; export default class Maps extends React.Component { constructor(props) { super(props); this.state = { dronePosition: [] }; } componentDidMount() { this.refreshMarkers(); } refreshMarkers = () => { // Clear state to prevent duplicates this.setState({dronePosition: []}); const config = { headers: { Authorization: `Bearer ${localStorage.getItem("token")}` } }; axios.get("https://swapi.co/api/starships").then(res => { res.data.results.forEach(element => { this.setState({ dronePosition: [...this.state.dronePosition, element] }); }); console.log(this.state.dronePosition); }); }; render() { return( <div> <div onClick={this.refreshMarkers}>Click on me to refresh markersdiv> render the map here... div> ); } }
No matter what stage you're at in your education or career, TuteeHub will help you reach the next level that you're aiming for. Simply,Choose a subject/topic and get started in self-paced practice sessions to improve your knowledge and scores.
General Tech 10 Answers
General Tech 7 Answers
General Tech 3 Answers
General Tech 9 Answers
General Tech 2 Answers
Ready to take your education and career to the next level? Register today and join our growing community of learners and professionals.