How can I select all elements with the same class name?

Question

I have a Boolean variable. It is stored in a hidden input field. Basically, if the user is signed in, it is false, if not, it is true.

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Answer 1

if (document.getElementById('download_btn_var_input').value == "true") {
    var el = document.getElementsByClassName('project_download_btn');
    for (var i = 0; i < el.length; i++) {
        el[i].hidden = true;
    }
}