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showing results for - "cannot read property 27classlist 27 of undefined"
Rafael
10 Jan 2018
1It means that document.getElementById("lastName") is returning undefined and you're trying to call classList on undefined itself.
2
3In your HTML input has the attribute name which equals lastName but there is no actual id="lastname"
4
5Either add the attribute id to your input or change getElementById to getElementsByName.
6
7Note that getElementsByName doesn't return a single item.
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