I am using a firebase onSnapshot method to use realtime data in react native app and wrote a separate async function to listen to the firestore as given below, I am using useEffect to call this function and I want to return the subscriber method returning from the firestore as a cleanup function. I know that I can achieve that
Tag: react-native
React Native format cookie
I have a cookie that looks like this: Are there any libraries that could help me format the string to something such as: I’ve been looking through set-cookie-parser but doesn’t look it contains any useful functions. Answer Try this. //Output
React Native Component Exception – Element Type is invalid: expected string…got undefined
I recently added a component to my project and this error is coming up for some reason. I know it’s being exported correctly from the component and imported by App.js correctly. (Exporting as default and importing without {}). It’s also strange that when I change the export of App from exporting in the function declaration to exporting from below with
LinearGradient and onPress for navigation
so I am new to react native and know the basics about using onPress with buttons but since I have changed my button to this LinearGradient code below, I am kind of lost using onPress. Right now I only have onPress outputting to my terminal just to test and make sure its working. In the end I want to navigate
How to render check box inside flatlist
I created a checkbox inside my flatlist but when I click on the checkbox all the check boxes will render. I want to render the checkbox I press not the entire checkboxes. This is my code. this is my data. Answer you set a global state so it is selecting checkbox for all items remove this set array of selected
JavaScript Array objects not printing to console
I have a code snippet that is suppose to print array object to log but not working wondering if someone could help. I am trying to get the subscriptionExpirationDate and item What works Console prints Purchased What Does not work console prints Undefined Could someone explain how to get the other objects to print in the console Here is the
Attempting to concat user input to array – react native
I want to take user input and update my bar chart according to the Y-axis value the user inputs. However, my function updateArray currently is updating the bar chart. Any ideas? Answer Put your data in state. then update your state.
React Native hooks usage with multiple objects
I am trying to create a todo list app, with a Share button that can share the todo list you have. The app is almost complete, the other parts of the code is irrelevant I thought but if needed I can post them. My state is like this: My share function is like this – directly taken from the official
React: How can I show an already existing image in react update form and then show the new one once a new image is uploaded?
hey guys i am learning react js and I have an update form to update book info. I am using django rest api for endpoints. I have a working form where I can upload files and do all those stuffs but I am not able to show the image which is already there in the template, Here I have a
undefined is not an object (evaluating ‘_this.props.navigation’) in react native when passing parameter
im passing parameter from screen A to screen B Screen A : Screen B : but theres an error on screen B that say ‘undefined is not an object (evaluating ‘_this.props.navigation’)’ im using react-native-jitst-meet to create simple confrence app for class project. I really hope you guys can give the solution. Thankyou before Answer You are using a functional component.