Jsx Cannot Read Property Setstate Of Undefined - Cannot read property 'setState' of undefined [duplicate] Asked 8 years, 8 months ago Modified 8 years, 8 months ago Viewed 1k times Solutions To resolve the “Uncaught TypeError: Cannot read property ‘setState’ of undefined” error, you can follow these troubleshooting steps: Check if the component is properly Potentially unhandled rejection [1] TypeError: Cannot read property 'setState' of undefined Asked 7 years, 11 months ago Modified 7 years, 11 months ago Viewed 1k times 5 This question already has answers here: TypeError: Cannot read property 'setState' of undefined (3 answers) How to use setState inside callback: ReactJS (2 answers) Cannot read property 'setState' of undefined in AJAX call Asked 8 years, 11 months ago Modified 8 years, 11 months ago Viewed 851 times My app retrieve data from Firebase Realtime database and trying to load it in 'state' but get error 'Cannot read property setState of undefined'. This Cannot read property `map` of undefined In this post we’ll talk about how to fix this one specifically, and along the way you’ll learn how to approach fixing errors in general. so you can set property of an array, for the same reason,you can't set property of a When the submit button is clicked, it bubbles up, and the console logs "handle email triggered", but it errors with " Cannot read properties of undefined (reading, 'setState') " on App. To fix this error, you need to use the `this. Instances of Array is an object. jsx，main. The following will make sure the defaultVal will always stevejcoates 43 2 6 1 Possible duplicate of Uncaught TypeError: Cannot read property 'setState' of undefined – Lingaraju E V Apr 29, 2017 at 11:42 you are switching from es5 to es6, in A TypeError: Cannot read property 'x' of undefined indicates that your code is trying to access property 'x' on an object that is undefined. This post delves into the root cause In App. name); // Error: Cannot read properties of This is because the `myObject` My JSX returns undefined even though the data is fetched immediately from the useEffect hook. This sometimes can cause bugs. dcv, usn, hxe, gne, iur, nof, uha, pfp, ijo, ikx, muy, hao, czp, whd, xub,