A data-attribute add-on for custombox

custombox_addon.js

function open_custombox()
{
    var modal_settings = $(this).data("modal");
    if (typeof(modal_settings) === 'string')
    {
        Custombox.open({
            target: modal_settings
        });
    }
    else if(typeof(modal_settings) === 'object')
    {
        Custombox.open(modal_settings);
    }
}

var selection = document.querySelectorAll("[data-trigger='modal']");
for (var i = 0; i < selection.length; i++)
{
    selection[i].addEventListener("click", open_custombox);
}