LabelsSelect DropdownValue Component

app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value.vue

+<script>
+import tooltip from '~/vue_shared/directives/tooltip';
+
+export default {
+  directives: {
+    tooltip,
+  },
+  props: {
+    labels: {
+      type: Array,
+      required: true,
+    },
+    labelFilterBasePath: {
+      type: String,
+      required: true,
+    },
+  },
+  computed: {
+    isEmpty() {
+      return this.labels.length === 0;
+    },
+  },
+  methods: {
+    labelFilterUrl(label) {
+      return `${this.labelFilterBasePath}?label_name[]=${encodeURIComponent(label.title)}`;
+    },
+    labelStyle(label) {
+      return {
+        color: label.textColor,
+        backgroundColor: label.color,
+      };
+    },
+  },
+};
+</script>
+
+<template>
+  <div class="hide-collapsed value issuable-show-labels">
+    <span
+      v-if="isEmpty"
+      class="text-secondary"
+    >
+      <slot>{{ __('None') }}</slot>
+    </span>
+    <a
+      v-else
+      v-for="label in labels"
+      :key="label.id"
+      :href="labelFilterUrl(label)"
+    >
+      <span
+        v-tooltip
+        class="label color-label"
+        data-placement="bottom"
+        data-container="body"
+        :style="labelStyle(label)"
+        :title="label.description"
+      >
+        {{ label.title }}
+      </span>
+    </a>
+  </div>
+</template>

spec/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_spec.js

+import Vue from 'vue';
+
+import dropdownValueComponent from '~/vue_shared/components/sidebar/labels_select/dropdown_value.vue';
+
+import { mockConfig, mockLabels } from './mock_data';
+
+import mountComponent from '../../../../helpers/vue_mount_component_helper';
+
+const createComponent = (
+  labels = mockLabels,
+  labelFilterBasePath = mockConfig.labelFilterBasePath,
+) => {
+  const Component = Vue.extend(dropdownValueComponent);
+
+  return mountComponent(Component, {
+    labels,
+    labelFilterBasePath,
+  });
+};
+
+describe('DropdownValueComponent', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = createComponent();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('computed', () => {
+    describe('isEmpty', () => {
+      it('returns true if `labels` prop is empty', () => {
+        const vmEmptyLabels = createComponent([]);
+        expect(vmEmptyLabels.isEmpty).toBe(true);
+        vmEmptyLabels.$destroy();
+      });
+
+      it('returns false if `labels` prop is empty', () => {
+        expect(vm.isEmpty).toBe(false);
+      });
+    });
+  });
+
+  describe('methods', () => {
+    describe('labelFilterUrl', () => {
+      it('returns URL string starting with labelFilterBasePath and encoded label.title', () => {
+        expect(vm.labelFilterUrl({
+          title: 'Foo bar',
+        })).toBe('/gitlab-org/my-project/issues?label_name[]=Foo%20bar');
+      });
+    });
+
+    describe('labelStyle', () => {
+      it('returns object with `color` & `backgroundColor` properties from label.textColor & label.color', () => {
+        const label = {
+          textColor: '#FFFFFF',
+          color: '#BADA55',
+        };
+        const styleObj = vm.labelStyle(label);
+
+        expect(styleObj.color).toBe(label.textColor);
+        expect(styleObj.backgroundColor).toBe(label.color);
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('renders component container element with classes `hide-collapsed value issuable-show-labels`', () => {
+      expect(vm.$el.classList.contains('hide-collapsed', 'value', 'issuable-show-labels')).toBe(true);
+    });
+
+    it('render slot content inside component when `labels` prop is empty', () => {
+      const vmEmptyLabels = createComponent([]);
+      expect(vmEmptyLabels.$el.querySelector('.text-secondary').innerText.trim()).toBe(mockConfig.emptyValueText);
+      vmEmptyLabels.$destroy();
+    });
+
+    it('renders label element with filter URL', () => {
+      expect(vm.$el.querySelector('a').getAttribute('href')).toBe('/gitlab-org/my-project/issues?label_name[]=Foo%20Label');
+    });
+
+    it('renders label element with tooltip and styles based on label details', () => {
+      const labelEl = vm.$el.querySelector('a span.label.color-label');
+      expect(labelEl).not.toBeNull();
+      expect(labelEl.dataset.placement).toBe('bottom');
+      expect(labelEl.dataset.container).toBe('body');
+      expect(labelEl.dataset.originalTitle).toBe(mockLabels[0].description);
+      expect(labelEl.getAttribute('style')).toBe('background-color: rgb(186, 218, 85);');
+      expect(labelEl.innerText.trim()).toBe(mockLabels[0].title);
+    });
+  });
+});