The problem is simple. When I take the variable into the array it doesn't work. When I write the variable into inputs it works. How can I pass the variable into the array?
var testW = document.querySelectorAll("input[type='text']");
var testQ = document.getElementsByClassName("deleteObjectbyJS");
var testlength = testW.length;
if(testW[testlength].value == ""){
testQ[0].style.display = "none";
}
Arrays in JS start indexing from 0 to SIZE-1 so your code is wrong here:
if(testW[testlength-1].value == ""){
testQ[0].style.display = "none";
}
I don't know if this solve your problem completly but this is an error for sure
testlength is length of the list. When you trying to access testW[testlength] you actually access non existing element after the last element because elements indexes are between 0 and testlength-1.
testW[testlength] should be testW[testlength-1]
testlength). When your code tries to access the data at index 0 of the array, it finds there's nothing there which results in the array returningundefined.