How to add dropdown menu in Headline theme?

[denvergeeks]

@journaluser here is the code that works for the Headline theme:

Header Code Injection…

<style>

li[class*="nav-"][class*="--hasDropDown"] {
	position: relative;
}
li[class*="nav-"][class*="--hasDropDown"] a:after {
	content: "▼";
	padding-left: 5px;
	font-size: 12px;
	color: inherit;
}
li[class*="nav-"][class*="--hasDropDown"] .isDropDown a:after {
	display:none;
}
li[class*="nav-"][class*="--hasDropDown"]:focus-within > li[class*="nav-"]:after,
li[class*="nav-"][class*="--hasDropDown"]:hover > li[class*="nav-"]:after {
	background-color: transparent;
}
li[class*="nav-"][class*="--hasDropDown"]:focus-within .isDropDown,
li[class*="nav-"][class*="--hasDropDown"]:hover .isDropDown {
	opacity: 1;
	visibility: visible;
}
.isDropDown {
	z-index: 1;
	opacity: 0;
	visibility: hidden;
	position: absolute;
	margin: 0;
	max-width: unset;
	list-style: none;
	/* The padding inside the drop down (the space surrounding the links) */
	padding: 10px;
	/* The rounded corners of the drop down */
	border-radius: 6px;
	/* The background color of the drop down */
	background: #000;
	/* The color of the links in the drop down */
	color: #fff;
}
.isDropDown a {
    color: #fff;
}
.isDropDown li[class*="nav-"] {
	margin-right: 0 !important;
}
.isDropDown li[class*="nav-"]:not(:last-child) {
	margin-bottom: 0;
    /* Dividers between the dropdown items */
    border-bottom: 1px solid #ddd;
}
</style>

Footer Code Injection…

<script>
    
(function () {
    const mediaQuery = window.matchMedia('(max-width: 767px)');
    
    // IMPORTANT: For themes other than Casper, change the selector just below to select your theme's header menu selector
    const menu = document.querySelector('.gh-head-menu');
    const nav = menu.querySelector('.nav');
    if (!nav) return;

    // IMPORTANT: For themes other than Casper, change the selector just below to select your theme's header logo selector
    const logo = document.querySelector('.gh-head-logo');
    const navHTML = nav.innerHTML;

    if (mediaQuery.matches) {
        const items = nav.querySelectorAll('li');
        items.forEach(function (item, index) {
            item.style.transitionDelay = 0.03 * (index + 1) + 's';
        });
    }
    
    const makeHoverdown = function () {
        if (mediaQuery.matches) return;

        var dropDown_list = [],
        latest_navigation_item,
        // IMPORTANT: For themes other than Casper, change the selector just below to select your theme's header menu item selector 
        nav_list = document.querySelectorAll('.gh-head-menu li');
        var newMenuList = [];
        var menuTree = {};

        nav_list.forEach( (item, index) => {
            if(item.childNodes[0].innerText.startsWith('-')) {
                if(menuTree[newMenuList.length - 1]) {
            menuTree[newMenuList.length - 1].push(item);
                } else {
            menuTree[newMenuList.length - 1] = [item];
            }
        } else {
        newMenuList.push(item);
        }
        });
        
        nav_list = newMenuList.map((item, index) => {
        if(menuTree[index]) {
            let dropdown = document.createElement('ul');
            dropdown.className = 'isDropDown';
            menuTree[index].forEach(child => {
                dropDown_item_text = child.childNodes[0].innerText;
                child.childNodes[0].innerText = dropDown_item_text.replace('- ', '');
                dropdown.appendChild(child);
            });
        item.className += '--hasDropDown';
        item.appendChild(dropdown);
        }
        return item;
        });
    }

    imagesLoaded(logo, function () {
        makeHoverdown();
    });

    window.addEventListener('resize', function () {
        setTimeout(function () {
            nav.innerHTML = navHTML;
            makeHoverdown();
        }, 1);
    });

})();
</script>

For any others reading this, to create the links in the dropdown - you simply add a hyphen (-) and then a space before the Navigation label… like so…

Here’s how the Dropdown appears on the Headline theme (created with the code and instructions in this post)…