Huljo / MowItNow

anchors.options.placement = 'left';

anchors.add().remove('.no-anchor');

// Filter UI

var tocElements = document.getElementById('toc').getElementsByTagName('a');

document.getElementById('filter-input').addEventListener('keyup', function(e) {

  var i, element;

  // enter key

  if (e.keyCode === 13) {

    // go to the first displayed item in the toc

    for (i = 0; i < tocElements.length; i++) {

      element = tocElements[i];

      if (!element.classList.contains('hide')) {

        location.replace(element.href);

        return e.preventDefault();

      }

    }

  }

  var match = function() { return true; },

    value = this.value.toLowerCase();

  if (!value.match(/^\s*$/)) {

    match = function(text) { return text.toLowerCase().indexOf(value) !== -1; };

  }

  for (i = 0; i < tocElements.length; i++) {

    element = tocElements[i];

    if (match(element.innerHTML)) {

      element.classList.remove('hide');

    } else {

      element.classList.add('hide');

    }

  }

});