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[Solved] TypeError: Cannot read property ‘classList’ of null

Hello Guys, How are you all? Hope You all Are Fine. Today I get the following error TypeError: Cannot read property ‘classList’ of null in javascript. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How To Solve TypeError: Cannot read property ‘classList’ of null Error ?

  1. How To Solve TypeError: Cannot read property 'classList' of null Error?

    To Solve TypeError: Cannot read property 'classList' of null Error actual id=”lastname” Either add the attribute id to your input or change getElementById to getElementsByName. Note that getElementsByName doesn't return a single item.

  2. TypeError: Cannot read property 'classList' of null

    To Solve TypeError: Cannot read property 'classList' of null Error actual id=”lastname” Either add the attribute id to your input or change getElementById to getElementsByName. Note that getElementsByName doesn't return a single item.

Solution 1

  1. Here For Example document.getElementById("lastName") is returning undefined and you’re trying to call classList on undefined itself.
  2. In your HTML input has the attribute name which equals lastName but there is no actual id="lastname"
  3. Either add the attribute id to your input or change getElementById to getElementsByName.
  4. Note that getElementsByName doesn’t return a single item.

Summery

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you? Thank You.

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