I have part of a React Component that looks like this: And a click handler for the th element: I want to capture the th element. It works fine when headerElement is ‘some string’, but when it is an input element, the input element is the one referenced in the event.target property. What’s th…
Tag: reactjs
react.js Replace img src onerror
I have a react component that is the detail view from a list. I am trying to replace the image with a default image if the image does not exist and there is a 404 error. I would normally use the onerror method in the img tag but that doesn’t seem to be working. I am not sure how to
update nested object with (ES6) computed property name
In my case, I’m using React.js and I would like to dynamically update the values in the deployOptions object. For example – initial state looks like: Obviously this is not correct – but this is what I’m trying to achieve so that my state would then be Answer It’s not especially p…
Can’t type in React input text field
I’m trying my first bit of React.js and am stumped early on… I have the code below, which renders a search form into <div id=”search”></div>. But typing in the search box does nothing. Presumably something is going missing passing the props and state up and down, and this s…
react componentDidMount not firing
I set up a new react project and for some reason, the componentDidMount method is not being called. I have verified this behavior by placing a call to console.log in componentDidMount but I cannot see its output in the console. Furthermore, this.setState() is not working. I’m pretty stumped as to why th…
React: “this” is undefined inside a component function
I want to update loopActive state on toggle, but this object is undefined in the handler. According to the tutorial doc, I this should refer to the component. Am I missing something? Answer ES6 React.Component doesn’t auto bind methods to itself. You need to bind them yourself in constructor. Like this:
How to access canvas context in React
I made a color picker with React and Canvas. Currently the components are rendered in React and canvas is done with vanilla javascript. I’d like to two to mesh more, so I want the click events to be handled with React. For example, this I would hope would be able to translate to this But that doesn̵…
Eslint – Maximum call stack size exceeded
Working in a React / Webpack project I started to have problems with the eslint library. The eslint package is downloaded using npm and it’s used to validate the project using a webpack preLoader. It used to work fine until recently when I tried to git clone the same project to an other folder. After in…
What does React Native use to allow JavaScript to be executed on iOS and Android natively?
What does React Native use under the covers to interface with iOS and Android? Cordova uses a WebView to effectively display a webpage inside of a native container; Does React Native use the same approach? If not, What approach does it use? Answer As you noticed React Native is not based on Cordova. It is not…
Detect click outside React component
I’m looking for a way to detect if a click event happened outside of a component, as described in this article. jQuery closest() is used to see if the target from a click event has the dom element as one of its parents. If there is a match the click event belongs to one of the children and is thus