I’m using React Native Navigation dependency as route. But I have problem in the following code which appears to do nothing. I’m trying to create 2 screens, one is login, the other is register (later on I will add button to move between them, right now even the default screen doesn’t work). …
Tag: react-native
Undefined is not a function (near ‘… map …’)
When I tap in the Pressable element in the JSX I get the error : Undefined is not a function (near ‘… wines.map …’). The log says it’s coming from the wines.map loop in the JSX. I’m unsure on what could be wrong with how I’m trying to change the data in the toggle fun…
React Native Updating State with this.setState
Hi I’m trying to update the state data value (data:[]) from API. the issue is from the line highlighted: Answer Hi please check below code.
React Native Firebase Array Query to do ArrayContains with AND operation
I have group collection. In each group document, I store which users are associated with the group via members array field in firebase. Eg: user1 & user2 are in xyz(id) group and I would like to query from client to get all the group where having user1 & user2 ( not OR ). I have tried firebase IN arra…
this.props.navigation.navigate() not working
I want the app to check if there’s a user logged in (firebase authentication). If there is, navigate to one page (react navigation v5), if there isn’t, to another. I have the following code: In App.js In Loading.js I get an error which says: TypeError: undefined is not an object (evaluating ‘…
TypeError: Object(…) is not a function (React)
I was following a tutorial on how to add google maps to a react/expo javascript project. I am new to the javascript language and have had a bug that I cannot find an answer to. when compiling the app I am given the error “TypeError: Object(…) is not a function”. here is the link to the tutor…
Dynamic change of global variables in react native
I have an mqtt client inside my react native app and it constently receives data from a broker. This data is being used in many different screens/components differently (I have 1 class which extends React.Component per screen). For example I show the data I receive from topic x on screen 1 while I show the da…
React.js TypeError: Cannot read property ‘map’ of null
I m not sure how can i explain it. But i will do my best. I’m developing a Movie App. I dont have problem about receiving data and viewing it on the screen. Besides i can see my errors on screen like “Too Many Results” but it’s working only on main page. When i’m doing my searchi…
Destructuring a function call
Assuming the following code: EsLint gives out the following error: While the current code is clear and concise, if I still wanted to destructure the code and make EsLint happy, how could I do it ? Answer The docs for this rule say that properties of props should be destructured before using them, so just do t…
Display dynamic arraylist using reactJS
I am working on building a web application using reactJS. We should display the product users subscribed to. Number of products each user subscribes to differs. For Example, here is the response : So, the subscription data is dynamic. How can I display the above data in tabular data as follow :Mock User can s…