Web Reference: Oct 1, 2025 · There can be several reasons for the "uncaught typeerror" message in JavaScript. We review all the possible causes and fixes in this article. I have some JavaScript code that gives this error: Uncaught TypeError: Cannot read property 'value' of undefined Here is my code: var i1 = document.getElementById ('i1'); var i2 = document. This means you expected an object or an array, but you got nothing. This guide will break down the common causes of this error, from working with uninitialized variables and non-existent object properties to accessing DOM elements that haven't been loaded yet.
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