Add AJAX filtering of company list

- Search across NAME and DESCRIPTION fields
- TODO - Implement pagination (how?)

InvenTree/static/script/filter_company.js

@@ -0,0 +1,72 @@
+var keyDelay = 0;
+
+var delay = (function(){
+    return function(callback, ms){
+        clearTimeout(keyDelay);
+        keyDelay = setTimeout(callback, ms);
+    };
+})();
+
+
+function add_company(company){
+
+    var text = "<li class='list-group-item'>";
+
+    text += "<b><a href='" + company.url + "'>";
+    text += company.name + "</a></b>";
+
+    if (company.description){
+        text += " - " + company.description;
+    }
+
+    text += "</li>";
+
+    $("#company-list").append(text);
+}
+
+
+function filter(text){
+
+    $.ajax(
+        {
+            url: "/api/company/",
+            success: function(result) {
+                $("#company-list").empty();
+                $.each(result.results, function(i, company){
+                    add_company(company);
+                })
+            },
+            data: {
+                'search': text,
+            }
+        }
+    );
+}
+
+$(document).ready(function(){
+  $("#company-filter").keyup(function(e) {
+
+      if (e.keyCode == 27){ // Escape key
+          clearTimeout(keyDelay);
+          $("#company-filter").val('');
+          filter('');
+      }
+      else {
+
+          var value = $(this).val().toLowerCase();
+
+          delay(function() {
+              filter(value);
+          }, 500);
+      }
+  });
+
+  $("#clear-filter").click(function(){
+      clearTimeout(keyDelay);
+      $("#company-filter").val('');
+      filter('');
+  });
+
+  // Initially load the list with all values
+  filter('');
+});