js/autocomplete.js

function autocomplete(inp, obj, act) {
  /*the autocomplete function takes two arguments,
  the text field element and an objay of possible autocompleted values:*/
  var currentFocus;
  /*execute a function when someone writes in the text field:*/
  inp.addEventListener("input", function(e) {
    var a, b, i, val = this.value;
    /*close any already open lists of autocompleted values*/
    clearLists();
    document.querySelector(".md-google-search__empty-btn").style.display = (val ? "block" : "none");
    if (!val || val.length < 3) return false;
    currentFocus = -1;
    var is_empty = true;

    /*for each item in the object...*/
    for (node in obj) {
  		var nomNode = obj[node].name;

  		if (nomNode.toUpperCase().includes(val.toUpperCase())) {
        is_empty = false;
  			var parts = nomNode.toUpperCase().split(val.toUpperCase());

			  /*create a DIV element for each matching element:*/
			  b = document.createElement("div");
        b.setAttribute("class", "autocomplete-item");

			  /*make the matching letters bold:*/
			  if (parts[0].length == 0) b.innerHTML = "";
			  else b.innerHTML = "<span style='font-weight: bold;'>" + nomNode.substr(0, parts[0].length) + "</span>";
			  b.innerHTML += nomNode.substr(parts[0].length, val.length);
			  b.innerHTML += "<span style='font-weight: bold;'>" + nomNode.substr(parts[0].length + val.length) + "</span>";
			  b.innerHTML += " <span class='autocomplete-year'>(" + obj[node].year + ")</span>";

        /*include node id to keep track of which is it*/
        b.dataset.id = node;

			  /*execute a function when someone clicks on the item value (DIV element):*/
			  b.addEventListener("click", function(e) {
				  /*insert the value for the autocomplete text field:*/
				  var n = this.dataset.id;
				  inp.value = obj[n].name;

				  switch (act) {
  					case "search":
  					  // Move camera to desired node
  						cameraGoto(obj[n].x, obj[n].y);
  						break;
  					case "addEdge":
  					  // @TODO: Add an edge between A and B
  					  alert(obj[n].name);
  					  break;
				  }

				  /*close the list of autocompleted values,
				  (or any other open lists of autocompleted values:*/
				  clearLists();
			  });

			  // Set "data-edges" attribute and compare with others
			  var nEdges = Object.keys(s.graph.neighbors(node)).length;
			  b.dataset.edges = nEdges;
			  var inserted = false;

			  // Sort nodes by degree
			  for (i in document.querySelector("#autocomplete-list").childNodes) {
				  var child = document.querySelector("#autocomplete-list").childNodes[i];
				  if (!child.dataset) break;
				  if (nEdges > child.dataset.edges) {
					  document.querySelector("#autocomplete-list").insertBefore(b, child);
					  inserted = true;
					  break;
				  }
			  }

			  if (!inserted) {
				  document.querySelector("#autocomplete-list").appendChild(b);
			  }
		  }
    }

    document.querySelector(".autocomplete-container").style.display = (is_empty ? "none" : "block");
  });

  document.querySelector(".md-google-search__empty-btn").addEventListener("click", function() {
    document.querySelector("#search-input").value = "";
    this.style.display = "none";
  });

  /*execute a function presses a key on the keyboard:*/
  inp.addEventListener("keydown", function(e) {
      var x = document.getElementById("autocomplete-list");
      if (x) x = x.getElementsByTagName("div");
      if (x.length == 0) return;
      if (e.keyCode == 40) {
        /*If the objow DOWN key is pressed,
        increase the currentFocus variable:*/
        currentFocus++;
        /*and and make the current item more visible:*/
        addActive(x);
      } else if (e.keyCode == 38) { //up
        /*If the objow UP key is pressed,
        decrease the currentFocus variable:*/
        currentFocus--;
        /*and and make the current item more visible:*/
        addActive(x);
      } else if (e.keyCode == 13) {
        /*If the ENTER key is pressed, prevent the form from being submitted,*/
        e.preventDefault();
        if (currentFocus > -1) {
          /*and simulate a click on the "active" item:*/
          if (x) x[currentFocus].click();
        }
      }
  });
  function addActive(x) {
    /*a function to classify an item as "active":*/
    if (!x) return false;
    /*start by removing the "active" class on all items:*/
    removeActive(x);
    if (currentFocus >= x.length) currentFocus = 0;
    if (currentFocus < 0) currentFocus = (x.length - 1);
    /*add class "autocomplete-active":*/
    x[currentFocus].classList.add("autocomplete-active");
  }
  function removeActive(x) {
    /*a function to remove the "active" class from all autocomplete items:*/
    for (var i = 0; i < x.length; i++) {
      x[i].classList.remove("autocomplete-active");
    }
  }
  function clearLists() {
    /*close all autocomplete lists in the document,
    except the one passed as an argument:*/
    var x = document.querySelector("#autocomplete-list");
    x.innerHTML = "";
    document.querySelector(".autocomplete-container").style.display = "none";
  }
  /*execute a function when someone clicks in the document:*/
  document.addEventListener("click", function (e) {
      clearLists();
  });
}