Javascript get form array values

I guess you could try:

var inputs = document.querySelectorAll("#formIDHere input[name='name[]']");
alert(inputs.length);
for (i = 0; i < inputs.length; i++) {
    // your code here
}

Simple approach:

var names=document.getElementsByName('name[]');

for(key=0; key < names.length; key++)  {
    alert(names[key].value);

    //your code goes here
}