Add items to Drupal left (in-page) menu #drupal #javascript

add-items-to-drupal-menu.js

// create navigation for page sections
    function createInPageNavMenu() {
        var sideNavList = document.querySelector('.bc-ipnav-block ul'),
            // get reference to Related Topics item
            lastLI = sideNavList.lastChild,
            i,
            max = navLabel.length,
            aEl,
            liEl,
            txt;
        for (i = 0; i < max; i++) {
            liEl = document.createElement('li');
            aEl = document.createElement('a');
            aEl.setAttribute('href', '#' + navLabel[i].link);
            txt = document.createTextNode(navLabel[i].text);
            aEl.appendChild(txt);
            liEl.appendChild(aEl);
            sideNavList.insertBefore(liEl, lastLI);
        }
    }

    // create array of new nav objects
    function createInPageNav() {
        var navObj = {},
            h2s = document.querySelectorAll('section.bcls-section h2'),
            i, index,
            iMax = h2s.length;
        // set initial visibilities
        for (i = 0; i < iMax; i++) {
            index = i;
            // in this case there's already one item at the top of the menu
            // so skipping that
            if (index > 0) {
                $this = h2s[i];
                navObj = {};
                navObj.link = $this.getAttribute("id");
                navObj.text = $this.innerHTML;
                navLabel.push(navObj);
            }
        }
        // bclslog('navLabel', navLabel);
        // only create the nav widget if there is more than one item
        if (navLabel.length > 1) {
            // create in-page nav menu
            createInPageNavMenu();
        }
    }