Is it possible to store an object in the state of a React component? If yes, then how can we change the value of a key in that object using setState? I think it’s not syntactically allowed to write something like: On similar lines, I’ve another question: Is it okay to have a set of variables in a React component
Tag: reactjs
Exchanging events between React components
I’m making a Chrome extension that inserts 2 different React extensions on to the page. I’d like to keep each of them in sync by sending the 2nd one an event with appropriate data when something else is selected in the first one. Is there a best practice when it comes to sending events to other components? I tried this
How to listen state changes in react.js?
What is the angular’s $watch function equivalent in React.js? I want to listen state changes and call a function like getSearchResults(). Answer I haven’t used Angular, but reading the link above, it seems that you’re trying to code for something that you don’t need to handle. You make changes to state in your React component hierarchy (via this.setState()) and React
Issue accessing state inside setInterval in React.js
I am trying to access the state of a component inside a setInterval in this way but it’s not working: However, if I place the callback function in a separate component method, it works perfectly: Any idea why is this happening? I would prefer to use the first option. Answer In your first example, this is out of scope when
Call multiple functions onClick ReactJS
I know in vanilla JavaScript, we can do: What would be the equivalent for making two function calls onClick in ReactJS? I know calling one function is like this: Answer Wrap your two+ function calls in another function/method. Here are a couple variants of that idea: 1) Separate method or with ES6 classes: 2) Inline or ES6 equivalent:
onClick works but onDoubleClick is ignored on React component
I am building a Minesweeper game with React and want to perform a different action when a cell is single or double clicked. Currently, the onDoubleClick function will never fire, the alert from onClick is shown. If I remove the onClick handler, onDoubleClick works. Why don’t both events work? Is it possible to have both events on an element? Answer
.map() undefined is not a function in React.js
Right, I’m probably missing the obvious here but I am getting an ‘Uncaught TypeError: undefined is not a function’ I seems to be .map() that’s the problem but I can not see why. If I change it to var ideas = this.state.data I don’t get any errors, the JSON data is formatted correctly, what can be wrong? Answer It was
Loop inside React JSX
I’m trying to do something like the following in React JSX (where ObjectRow is a separate component): I realize and understand why this isn’t valid JSX, since JSX maps to function calls. However, coming from template land and being new to JSX, I am unsure how I would achieve the above (adding a component multiple times). Answer Think of it
React.js: onChange event for contentEditable
How do I listen to change events for a contentEditable-based control? Code on JSFiddle. Answer See Sebastien Lorber’s answer which fixes a bug in my implementation. Use the onInput event, and optionally onBlur as a fallback. You might want to save the previous contents to prevent sending extra events. I’d personally have this as my render function. jsbin Which uses