From 28ee93d735879dbf07c9a3549712f35bd8832da9 Mon Sep 17 00:00:00 2001
From: Ben Burwell <ben@benburwell.com>
Date: Sun, 28 Jul 2019 18:34:21 -0400
Subject: Typeahead and search

---
 templates/beerpage.jinja2 | 115 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 113 insertions(+), 2 deletions(-)

(limited to 'templates/beerpage.jinja2')

diff --git a/templates/beerpage.jinja2 b/templates/beerpage.jinja2
index b4116e2..662196f 100644
--- a/templates/beerpage.jinja2
+++ b/templates/beerpage.jinja2
@@ -37,8 +37,10 @@
 
     <nav class="navbar navbar-dark bg-info mb-3">
       <a class="navbar-brand" href="/">similar.beer</a>
-      <form class="form-inline" action="/search">
-        <input class="form-control mr-sm-2" type="search" name="q" placeholder="Search Beers" aria-label="Search">
+      <form class="form-inline" action="/search" method="post">
+        <div class="autocomplete" style="width:300px;">
+          <input id="myInput" class="form-control mr-sm-2 typeahead" type="search" name="q" placeholder="Search Beers" aria-label="Search">
+        </div>
         <button class="btn btn-secondary my-2 my-sm-0" type="submit">Go</button>
       </form>
       <a href="/random" class="btn btn-secondary my-2 my-sm-0">Random Beer!</a>
@@ -254,4 +256,113 @@
     </table>
     {% endif %}
 
+<script>
+(function() {
+
+  fetch('/all_beers.json')
+    .then(res => res.json())
+    .then(names => {
+      autocomplete(document.getElementById("myInput"), names);
+    })
+
+  function autocomplete(inp, arr) {
+  /*the autocomplete function takes two arguments,
+  the text field element and an array 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*/
+      closeAllLists();
+      if (!val) { return false;}
+      currentFocus = -1;
+      /*create a DIV element that will contain the items (values):*/
+      a = document.createElement("DIV");
+      a.setAttribute("id", this.id + "autocomplete-list");
+      a.setAttribute("class", "autocomplete-items");
+      /*append the DIV element as a child of the autocomplete container:*/
+      this.parentNode.appendChild(a);
+      /*for each item in the array...*/
+      for (i = 0; i < arr.length; i++) {
+        /*check if the item starts with the same letters as the text field value:*/
+        if (arr[i].substr(0, val.length).toUpperCase() == val.toUpperCase()) {
+          /*create a DIV element for each matching element:*/
+          b = document.createElement("DIV");
+          /*make the matching letters bold:*/
+          b.innerHTML = "<strong>" + arr[i].substr(0, val.length) + "</strong>";
+          b.innerHTML += arr[i].substr(val.length);
+          /*insert a input field that will hold the current array item's value:*/
+          b.innerHTML += "<input type='hidden' value='" + arr[i] + "'>";
+          /*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:*/
+              inp.value = this.getElementsByTagName("input")[0].value;
+              /*close the list of autocompleted values,
+              (or any other open lists of autocompleted values:*/
+              closeAllLists();
+          });
+          a.appendChild(b);
+        }
+      }
+  });
+  /*execute a function presses a key on the keyboard:*/
+  inp.addEventListener("keydown", function(e) {
+      var x = document.getElementById(this.id + "autocomplete-list");
+      if (x) x = x.getElementsByTagName("div");
+      if (e.keyCode == 40) {
+        /*If the arrow 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 arrow 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 closeAllLists(elmnt) {
+    /*close all autocomplete lists in the document,
+    except the one passed as an argument:*/
+    var x = document.getElementsByClassName("autocomplete-items");
+    for (var i = 0; i < x.length; i++) {
+      if (elmnt != x[i] && elmnt != inp) {
+      x[i].parentNode.removeChild(x[i]);
+    }
+  }
+}
+/*execute a function when someone clicks in the document:*/
+document.addEventListener("click", function (e) {
+    closeAllLists(e.target);
+});
+}
+
+
+})()
+  </script>
 {% endblock %}
-- 
cgit v1.2.3