Answers for "js input checkbox unchecked"

javascript check uncheck checkbox

document.getElementById("myCheckBoxID").checked = true; // Check
document.getElementById("myCheckBoxID").checked = false;// Uncheck

checkbox array send unchecked

<input type="hidden" name="something[]" value="off" />
<input type="checkbox" name="something[]" />
<input type="hidden" name="something[]" value="off" />
<input type="checkbox" name="something[]" />
<input type="hidden" name="something[]" value="off" />
<input type="checkbox" name="something[]" />