I am testing a React component using Jest and Enzyme, and am having difficulty testing that a debounced function is called properly (or at all). I’ve simplified the component code below (edited to make code even simpler), link to codepen here I figured that the debounced function test should be pretty s…
Tag: reactjs
How to use Jest to test functions using crypto or window.msCrypto
When running unit tests with Jest in react the window.crypto API is causing problems. I haven’t found a way to incorporate crypto in Jest without installing other packages which is something I can’t do. So without using another npm package is there a way to test functions that use: crypto.getRando…
How to add custom Icons to NativeBase
I have the .ttf and .svg files for customized icons that I designed. But I would like to import them into my NativeBase project, making them available for use in NB’s <Icon /> component. How can I achieve this? Answer React Native Custom Icon Font for NativeBase Adopted from: https://medium.com/@k…
React.js: Raw HTML string does not gets recognized as HTML elements from Node.js
I am sending a raw HTML from node.js to react. and It was successful. However, when I try to render it, they are render as raw string as opposed to HTML elements This is how I get the string from front-end: The render method from my react(Simplified) looks like this: In my server.js, i have the following code…
How to deal with a ref within a loop?
Below is my parent component with multiple inputs from a loop. How can I choose one input to focus? Do I have to create a dynamic ref in this case? Answer You can use callback refs to generate and store the dynamic ref of each input in an array. Now you can refer to them using the index of the
How to get a particular attribute from an array of array objects?
I have an Array of Arrays, and each Array consists of objects. Here is a simplified version of what I’m referring to (it is a console.log of my original array) – Each Array has objects in the following format (taking the first array from above) – The other arrays are similar with the same at…
react native how to call multiple functions when onPress is clicked
I am trying to call multiple functions when I click onPress using TouchableOpacity For example: What if I want to call two functions when onPress is clicked? Is there a way I could call multiple functions? Answer There are a few ways to achieve this. One option would be to define a function that calls functio…
React-router – How to pass data between pages in React?
I am working on a project where I have to pass data from one page to another. For example, I have data on the first page. Here is the first component page where I render this list of data with the name. I want to pass this data to the next page where I need this data and more data
How to allow only English letters in input fields?
So, this is my input field: How can I allow only English letters? This is the RegEx, I believe I should use: /[A-Za-z]/ig https://regex101.com/r/upWFNy/1 I am assuming that onChange() event should be used for this with the combination of setState() and event.target.value. Thanks. PS. I need to have this WHILE…
Getting error Invariant Violation tried to get frame out of range index?
I have create VenueList component. I want to display list using FlatList component in react native app. I am getting error: Invariant Violation tried to get frame out of range index (See screenshot). Code: VenueList.js: venueReducer.js: venueAction.js: The data which I want to display from API endpoint has js…