1 files changed, 119 insertions, 0 deletions
diff --git a/app/assets/javascripts/create_item_dropdown.js b/app/assets/javascripts/create_item_dropdown.js
new file mode 100644
index 00000000000..42e9e568170
--- /dev/null
+++ b/app/assets/javascripts/create_item_dropdown.js
@@ -0,0 +1,119 @@
+import _ from 'underscore';
+
+export default class CreateItemDropdown {
+  /**
+   * @param {Object} options containing
+   *                         `$dropdown` target element
+   *                          `onSelect` event callback
+   * $dropdown must be an element created using `dropdown_tag()` rails helper
+   */
+  constructor(options) {
+    this.defaultToggleLabel = options.defaultToggleLabel;
+    this.fieldName = options.fieldName;
+    this.onSelect = options.onSelect || (() => {});
+    this.getDataOption = options.getData;
+    this.createNewItemFromValueOption = options.createNewItemFromValue;
+    this.$dropdown = options.$dropdown;
+    this.$dropdownContainer = this.$dropdown.parent();
+    this.$dropdownFooter = this.$dropdownContainer.find('.dropdown-footer');
+    this.$createButton = this.$dropdownContainer.find('.js-dropdown-create-new-item');
+
+    this.buildDropdown();
+    this.bindEvents();
+
+    // Hide footer
+    this.toggleFooter(true);
+  }
+
+  buildDropdown() {
+    this.$dropdown.glDropdown({
+      data: this.getData.bind(this),
+      filterable: true,
+      remote: false,
+      search: {
+        fields: ['text'],
+      },
+      selectable: true,
+      toggleLabel(selected) {
+        return (selected && 'id' in selected) ? _.escape(selected.title) : this.defaultToggleLabel;
+      },
+      fieldName: this.fieldName,
+      text(item) {
+        return _.escape(item.text);
+      },
+      id(item) {
+        return _.escape(item.id);
+      },
+      onFilter: this.toggleCreateNewButton.bind(this),
+      clicked: (options) => {
+        options.e.preventDefault();
+        this.onSelect();
+      },
+    });
+  }
+
+  clearDropdown() {
+    this.$dropdownContainer.find('.dropdown-content').html('');
+    this.$dropdownContainer.find('.dropdown-input-field').val('');
+  }
+
+  bindEvents() {
+    this.$createButton.on('click', this.onClickCreateWildcard.bind(this));
+  }
+
+  onClickCreateWildcard(e) {
+    e.preventDefault();
+
+    this.refreshData();
+    this.$dropdown.data('glDropdown').selectRowAtIndex();
+  }
+
+  refreshData() {
+    // Refresh the dropdown's data, which ends up calling `getData`
+    this.$dropdown.data('glDropdown').remote.execute();
+  }
+
+  getData(term, callback) {
+    this.getDataOption(term, (data = []) => {
+      // Ensure the selected item isn't already in the data to avoid duplicates
+      const alreadyHasSelectedItem = this.selectedItem && data.some(item =>
+        item.id === this.selectedItem.id,
+      );
+
+      let uniqueData = data;
+      if (!alreadyHasSelectedItem) {
+        uniqueData = data.concat(this.selectedItem || []);
+      }
+
+      callback(uniqueData);
+    });
+  }
+
+  createNewItemFromValue(newValue) {
+    if (this.createNewItemFromValueOption) {
+      return this.createNewItemFromValueOption(newValue);
+    }
+
+    return {
+      title: newValue,
+      id: newValue,
+      text: newValue,
+    };
+  }
+
+  toggleCreateNewButton(newValue) {
+    if (newValue) {
+      this.selectedItem = this.createNewItemFromValue(newValue);
+
+      this.$dropdownContainer
+        .find('.js-dropdown-create-new-item code')
+        .text(newValue);
+    }
+
+    this.toggleFooter(!newValue);
+  }
+
+  toggleFooter(toggleState) {
+    this.$dropdownFooter.toggleClass('hidden', toggleState);
+  }
+}