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showing results for - "uncaught typeerror 3a cannot read property 27addeventlistener 27 of undefined"
Arianna
18 Apr 2018
11)Check you placed .before the class
2Example:
3document.getElementsByClassName('.yourclassname') //.before class name is wrong
4the code should be document.getElementsByClassName('yourclassname');
52)Check the spelling for addEventListener 
6///dont feel embrassed because i always do these mistakes eventhough i used this property it 10000 times
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