[EuiTour] Allow attaching tour steps via HTMLElement or DOM selector

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 - Updated `testenv` mock for `EuiIcon` to render `aria-label` as text ([#5709](https://github.com/elastic/eui/pull/5709))
 - Added `editorChecklist` glyph to `EuiIcon` ([#5705](https://github.com/elastic/eui/pull/5705))
+- Added `anchor` prop to `EuiTourStep` to allow for DOM selector attachment ([#5696](https://github.com/elastic/eui/pull/5696))
 
 **Breaking changes**
 

src-docs/src/views/tour/step_dom.js

@@ -0,0 +1,43 @@
+import React, { useRef, useState } from 'react';
+
+import {
+  EuiButtonIcon,
+  EuiText,
+  EuiSpacer,
+  EuiTourStep,
+} from '../../../../src/components';
+
+export default () => {
+  const [isOpen, setIsOpen] = useState(true);
+  const anchorRef = useRef();
+  return (
+    <div>
+      <EuiTourStep
+        // anchor={() => anchorRef.current}
+        anchor="#anchorTarget"
+        content={
+          <EuiText>
+            <p>The tour step content.</p>
+          </EuiText>
+        }
+        isStepOpen={isOpen}
+        minWidth={300}
+        onFinish={() => setIsOpen(false)}
+        step={1}
+        stepsTotal={1}
+        title="Title of the current step"
+        subtitle="Title of the full tour (optional)"
+        anchorPosition="rightUp"
+      />
+      <EuiButtonIcon
+        onClick={() => setIsOpen(!isOpen)}
+        iconType="globe"
+        aria-label="Anchor"
+        buttonRef={anchorRef}
+        id="anchorTarget"
+      />
+      <EuiSpacer size="xxl" />
+      <EuiSpacer size="xxl" />
+    </div>
+  );
+};

src-docs/src/views/tour/tour_example.js

@@ -10,6 +10,7 @@ import {
 } from '../../../../src/components';
 
 import Step from './step';
+import StepDom from './step_dom';
 import Tour from './tour';
 import Managed from './managed';
 import ManagedHook from './managed_hook';
@@ -39,6 +40,7 @@ const stepSnippet = `
   </EuiText>
 </EuiTourStep>
 `;
+const stepDomSource = require('!!raw-loader!./step_dom');
 const tourSource = require('!!raw-loader!./tour');
 const managedSource = require('!!raw-loader!./managed');
 const managedHookSource = require('!!raw-loader!./managed_hook');
@@ -91,6 +93,26 @@ export const TourExample = {
       demo: <Step />,
       snippet: stepSnippet,
     },
+    {
+      source: [
+        {
+          type: GuideSectionTypes.JS,
+          code: stepDomSource,
+        },
+      ],
+      text: (
+        <>
+          <h3>Using DOM selector as anchor location</h3>
+          <p>
+            Instead of wrapping the target element, use the{' '}
+            <EuiCode>anchor</EuiCode> prop to specify a DOM node. Accepted
+            values include an HTML element or function returning an HTML
+            element, or a DOM query selector.
+          </p>
+        </>
+      ),
+      demo: <StepDom />,
+    },
     {
       title: 'Standalone steps',
       source: [

src/components/focus_trap/focus_trap.tsx

@@ -11,13 +11,9 @@ import { FocusOn } from 'react-focus-on';
 import { ReactFocusOnProps } from 'react-focus-on/dist/es5/types';
 
 import { CommonProps } from '../common';
+import { findElement, ElementTarget } from '../../services';
 
-/**
- * A DOM node, a selector string (which will be passed to
- * `document.querySelector()` to find the DOM node), or a function that
- * returns a DOM node.
- */
-export type FocusTarget = HTMLElement | string | (() => HTMLElement);
+export type FocusTarget = ElementTarget;
 
 interface EuiFocusTrapInterface {
   /**
@@ -70,12 +66,7 @@ export class EuiFocusTrap extends Component<EuiFocusTrapProps, State> {
 
   // Programmatically sets focus on a nested DOM node; optional
   setInitialFocus = (initialFocus?: FocusTarget) => {
-    let node = initialFocus instanceof HTMLElement ? initialFocus : null;
-    if (typeof initialFocus === 'string') {
-      node = document.querySelector(initialFocus as string);
-    } else if (typeof initialFocus === 'function') {
-      node = (initialFocus as () => HTMLElement)();
-    }
+    const node = findElement(initialFocus);
     if (!node) return;
     // `data-autofocus` is part of the 'react-focus-on' API
     node.setAttribute('data-autofocus', 'true');

src/components/tour/tour_step.spec.tsx

@@ -0,0 +1,45 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import React from 'react';
+
+import { EuiTourStep } from './tour_step';
+
+const steps = [
+  {
+    step: 1,
+    content: 'You are here',
+  },
+];
+
+const config = {
+  onFinish: () => {},
+  stepsTotal: 1,
+  title: 'A demo',
+};
+
+describe('EuiTourStep', () => {
+  describe('with an `anchor` configuration', () => {
+    it('attaches to the anchor element', () => {
+      cy.realMount(
+        <>
+          <span id="anchor">Test</span>
+          <EuiTourStep
+            data-test-subj="step"
+            {...config}
+            {...steps[0]}
+            isStepOpen
+            anchor="#anchor"
+          />
+        </>
+      );
+
+      expect(cy.get('[data-test-subj="step"]').find('#anchor')).to.exist;
+    });
+  });
+});