Touppercase is not a function. type. Asynchronous Confusion: The undefined That A...

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  1. Touppercase is not a function. type. Asynchronous Confusion: The undefined That Arrives Too Soon The Jan 16, 2026 · The toUpperCase () method is used to convert all letters in a string to uppercase. toUpperCase is not a function" in Javascript Asked 10 years, 5 months ago Modified 10 years, 5 months ago Viewed 7k times Apr 25, 2013 · That's because data method for data-value='1' attribute returns a number and Number object doesn't have toUpperCase method, assuming that your data-* attributes contain both numeric and non-numeric values and you want to convert the non-numeric values to uppercase, you can use attr method instead that returns a string. Aug 30, 2020 · Javascript Uncaught TypeError: value. 2. If you do not want them, start the content on the same line as the opening backtick. ') is NOT updated by the string function. toUpperCase() method is invoked is not a String, then the runtime doesn't 'find' the method toUpperCase() since that method/function only exists on String objects. toUpperCase; You’re assigning the toUpperCase function itself to charArray. The target string (the part before the '.