The onChange event does not work. Answer The change event is triggered on the <select> element, not the <option> element. However, that’s not the only problem. The way you defined the change function won’t cause a rerender of the component. It seems like you might not have fully graspe…
Tag: reactjs
How to create a React Modal (which is appended to ) with transitions?
There is a modal in this answer https://stackoverflow.com/a/26789089/883571 which is creating a React-based Modal by appending it to <body>. However, I found it not compatible with the transition addons provided by React. How to create one with transitions(during enter and leave)? Answer At react conf 2…
React form onChange->setState one step behind
I encountered this problem building a webapp and I replicated it in this jsfiddle. Essentially, I would like an input to call this.setState({message: input_val}) every time I type something into it, then pass it into the parent App class which then re-renders the message onto the Message class. However the ou…
Understanding unique keys for array children in React.js
I’m building a React component that accepts a JSON data source and creates a sortable table. Each of the dynamic data rows has a unique key assigned to it but I’m still getting an error of: Each child in an array should have a unique “key” prop. Check the render method of TableComponen…
How do I bind react events from a mixin?
I want to write a simple mixin for a tooltip. I already know how to bind my mixin to DOM events: …but I’d like to bind to the React events instead, to take advantage of its consistent event system. How do I do it? Answer I think you probably want to do this in the render method of the mixing
What is the difference between state and props in React?
I was watching a Pluralsight course on React and the instructor stated that props should not be changed. I’m now reading an article (uberVU/react-guide) on props vs. state and it says Both props and state changes trigger a render update. Later in the article it says: Props (short for properties) are a C…
react-router – pass props to handler component
I have the following structure for my React.js application using React Router: I want to pass some properties into the Comments component. (normally I’d do this like <Comments myprop=”value” />) What’s the easiest and right way to do so with React Router? Answer UPDATE Since new …
Implement Facebook API login with reactjs
I’m working on using Facebook’s Javascript SDK for authentication. I’ve been able to import the SDK properly and put a Like button on my page. But, the facebook login button has to be wrapped in the tag: I currently have all of the code from the Facebook Login tutorial pasted into my index.h…
how to render multiple children without JSX
How to write this without using JSX? This comes from the react.js tutorial: http://facebook.github.io/react/docs/tutorial.html I know I can do the following: But this only adds one element. How can I add more next to one another. Answer You can use the online Babel REPL (https://babeljs.io/repl/) as a quick w…
react.js: removing a component
I’m fairly new at react.js, so any help is greatly appreciated. I have this: https://jsfiddle.net/rzjyhf91/ Wherein I have made 2 components: an image and a button. The goal is to remove the image with a click of the button, I use unmountComponentAtNode for that, but it does not work: How can I remove a…