[Vuejs]-'i is not defined' at FileReader.reader.onload VueJs

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At the end I changed everything that was in my function inside the reader.onload but with self instead of this. Less readable, but working.

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That’s because in your data section you have not assigned a value to key i. You should do i : 0 in your data, and in for loop let j = this.i; j < this.categories.length; j++)

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