fix(bv-tooltip): hide the tooltip when the title is set to empty (closes

 #5648) (#5677)

* fix(bv-tooltip): hide the tooltip when the title is set to empty

* Update tooltip.spec.js

src/components/tooltip/helpers/bv-tooltip.js

@@ -56,6 +56,9 @@ const CONTAINER_SELECTOR = [MODAL_SELECTOR, SIDEBAR_SELECTOR].join(', ')
 const DROPDOWN_CLASS = 'dropdown'
 const DROPDOWN_OPEN_SELECTOR = '.dropdown-menu.show'
 
+// Data attribute to temporary store the `title` attribute's value
+const DATA_TITLE_ATTR = 'data-original-title'
+
 // Data specific to popper and template
 // We don't use props, as we need reactivity (we can't pass reactive props)
 const templateData = {
@@ -200,8 +203,18 @@ export const BVTooltip = /*#__PURE__*/ Vue.extend({
       // ensure that the template updates accordingly
       this.handleTemplateUpdate()
     },
-    disabled(newVal) {
-      newVal ? this.disable() : this.enable()
+    title(newValue, oldValue) {
+      // Make sure to hide the tooltip when the title is set empty
+      if (newValue !== oldValue && !newValue) {
+        this.hide()
+      }
+    },
+    disabled(newValue) {
+      if (newValue) {
+        this.disable()
+      } else {
+        this.enable()
+      }
     }
   },
   created() {
@@ -272,10 +285,10 @@ export const BVTooltip = /*#__PURE__*/ Vue.extend({
           }
         }
       })
+      // If the title has updated, we may need to handle the `title`
+      // attribute on the trigger target
+      // We only do this while the template is open
       if (titleUpdated && this.localShow) {
-        // If the title has updated, we may need to handle the title
-        // attribute on the trigger target. We only do this while the
-        // template is open
         this.fixTitle()
       }
     },
@@ -594,22 +607,19 @@ export const BVTooltip = /*#__PURE__*/ Vue.extend({
       }
     },
     fixTitle() {
-      // If the target has a title attribute, null it out and
-      // store on data-title
+      // If the target has a `title` attribute, remove it and store it on a data attribute
       const target = this.getTarget()
-      if (target && getAttr(target, 'title')) {
-        // We only update title attribute if it has a value
-        setAttr(target, 'data-original-title', getAttr(target, 'title') || '')
+      if (target && hasAttr(target, 'title')) {
+        setAttr(target, DATA_TITLE_ATTR, getAttr(target, 'title') || '')
         setAttr(target, 'title', '')
       }
     },
     restoreTitle() {
-      // If target had a title, restore the title attribute
-      // and remove the data-title attribute
+      // If the target had a title, restore it and remove the data attribute
       const target = this.getTarget()
-      if (target && hasAttr(target, 'data-original-title')) {
-        setAttr(target, 'title', getAttr(target, 'data-original-title') || '')
-        removeAttr(target, 'data-original-title')
+      if (target && hasAttr(target, DATA_TITLE_ATTR)) {
+        setAttr(target, 'title', getAttr(target, DATA_TITLE_ATTR) || '')
+        removeAttr(target, DATA_TITLE_ATTR)
       }
     },
     // --- BvEvent helpers ---

src/components/tooltip/tooltip.spec.js

@@ -1119,7 +1119,7 @@ describe('b-tooltip', () => {
 
     // Tooltip element should not be in the document
     expect(document.body.contains(tip)).toBe(false)
-    expect(document.getElementById(`adb`)).toBe(null)
+    expect(document.getElementById('adb')).toBe(null)
 
     // Try and show element via root event (using ID of trigger button)
     // Note that this generates a console warning
@@ -1157,6 +1157,70 @@ describe('b-tooltip', () => {
     wrapper.destroy()
   })
 
+  it('closes when title is set to empty', async () => {
+    jest.useFakeTimers()
+    const wrapper = mount(App, {
+      attachTo: createContainer(),
+      propsData: {
+        show: true,
+        title: 'hello'
+      }
+    })
+
+    expect(wrapper.vm).toBeDefined()
+    await waitNT(wrapper.vm)
+    await waitRAF()
+    await waitNT(wrapper.vm)
+    await waitRAF()
+    await waitNT(wrapper.vm)
+    await waitRAF()
+    jest.runOnlyPendingTimers()
+    await waitNT(wrapper.vm)
+    await waitRAF()
+
+    expect(wrapper.element.tagName).toBe('ARTICLE')
+    expect(wrapper.attributes('id')).toBeDefined()
+    expect(wrapper.attributes('id')).toEqual('wrapper')
+
+    // The trigger button
+    const $button = wrapper.find('button')
+    expect($button.exists()).toBe(true)
+    expect($button.attributes('id')).toBeDefined()
+    expect($button.attributes('id')).toEqual('foo')
+    expect($button.attributes('title')).not.toBeDefined()
+    expect($button.attributes('data-original-title')).not.toBeDefined()
+    expect($button.attributes('aria-describedby')).toBeDefined()
+    // ID of the tooltip that will be in the body
+    const adb = $button.attributes('aria-describedby')
+
+    // <b-tooltip> wrapper
+    const $tipHolder = wrapper.findComponent(BTooltip)
+    expect($tipHolder.exists()).toBe(true)
+    expect($tipHolder.element.nodeType).toEqual(Node.COMMENT_NODE)
+
+    // Find the tooltip element in the document
+    const tip = document.getElementById(adb)
+    expect(tip).not.toBe(null)
+    expect(tip).toBeInstanceOf(HTMLElement)
+    const $tip = createWrapper(tip)
+    expect($tip.element.tagName).toBe('DIV')
+    expect($tip.classes()).toContain('tooltip')
+    expect($tip.classes()).toContain('b-tooltip')
+    // Should contain our title prop value
+    expect($tip.text()).toContain('hello')
+
+    // Change the title prop
+    await wrapper.setProps({ title: '' })
+    await waitRAF()
+    await waitRAF()
+
+    // Tooltip element should not be in the document
+    expect(document.body.contains(tip)).toBe(false)
+    expect(document.getElementById('adb')).toBe(null)
+
+    wrapper.destroy()
+  })
+
   it('applies noninteractive class based on noninteractive prop', async () => {
     jest.useFakeTimers()
     const wrapper = mount(App, {