Remove unnecessary id attribute on step tooltip containers.

Follows up on the discussion [here](#282 (comment)).

src/js/step.js

@@ -190,7 +190,7 @@ export class Step extends Evented {
   _createTooltipContent() {
     const content = document.createElement('div');
     const classes = this.options.classes || '';
-    const element = createFromHTML(`<div class='${classes}' data-shepherd-step-id='${this.id}' id="step-${this.options.id}-${uniqueId()}"}>`);
+    const element = createFromHTML(`<div class="${classes}" data-shepherd-step-id="${this.id}">`);
     const header = document.createElement('header');
 
     if (this.options.title) {

src/js/tour.js

@@ -5,6 +5,19 @@ import { bindMethods } from './bind.js';
 import tippy from 'tippy.js';
 import { defaults as tooltipDefaults } from './utils/tooltip-defaults';
 
+/**
+ * Creates incremented ID for each newly created tour
+ *
+ * @private
+ * @return {Number} The unique id for the tour
+ */
+const uniqueId = (function() {
+  let id = 0;
+  return function() {
+    return ++id;
+  };
+})();
+
 const Shepherd = new Evented();
 
 /**
@@ -17,6 +30,9 @@ export class Tour extends Evented {
    * @param {Object} options The options for the tour
    * @param {Object} options.defaultStepOptions Default options for Steps created through `addStep`
    * @param {Step[]} options.steps An array of Step instances to initialize the tour with
+   * @param {string} options.tourName An optional "name" for the tour. This will be appended to the the tour's
+   * dynamically generated `id` property -- which is also set on the `body` element as the `data-shepherd-active-tour` attribute
+   * whenever the tour becomes active.
    * @returns {Tour}
    */
   constructor(options = {}) {
@@ -43,6 +59,7 @@ export class Tour extends Evented {
     });
 
     this._setTooltipDefaults();
+    this._setTourID();
 
     return this;
   }
@@ -119,7 +136,7 @@ export class Tour extends Evented {
     this.trigger(event);
 
     Shepherd.activeTour = null;
-    document.body.classList.remove('shepherd-active');
+    this._removeBodyAttrs();
     this.trigger('inactive', { tour: this });
   }
 
@@ -260,7 +277,7 @@ export class Tour extends Evented {
    * @private
    */
   _setupActiveTour() {
-    document.body.classList.add('shepherd-active');
+    this._addBodyAttrs();
     this.trigger('active', { tour: this });
 
     Shepherd.activeTour = this;
@@ -291,6 +308,24 @@ export class Tour extends Evented {
       this._setupActiveTour();
     }
   }
+
+  _setTourID() {
+    const tourName = this.options.tourName || 'tour';
+    const uuid = uniqueId();
+
+    this.id = `${tourName}--${uuid}`;
+  }
+
+  _addBodyAttrs() {
+    document.body.setAttribute('data-shepherd-active-tour', this.id);
+    document.body.classList.add('shepherd-active');
+  }
+
+  _removeBodyAttrs() {
+    document.body.removeAttribute('data-shepherd-active-tour', this.id);
+    document.body.classList.remove('shepherd-active');
+  }
+
 }
 
 export { Shepherd };

test/unit/test.tour.js

@@ -67,6 +67,19 @@ describe('Tour | Top-Level Class', function() {
       assert.equal(tippySpy.callCount, 1);
       assert.equal(tippySpy.calledWith(tooltipDefaults), true);
     });
+
+    it('generates a unique `id` property, optionally based upon the `tourName` option', function() {
+      const instance1 = new Shepherd.Tour();
+      const instance2 = new Shepherd.Tour({ tourName: 'select-avatar'});
+
+      assert.equal(instance1.id.startsWith('tour--'), true);
+      assert.equal(instance2.id.startsWith('select-avatar--'), true);
+
+      const uniqueId1 = instance1.id.split('--')[1];
+      const uniqueId2 = instance2.id.split('--')[1];
+
+      assert.notEqual(uniqueId1, uniqueId2);
+    });
   });
 
   describe('methods', () => {
@@ -142,6 +155,14 @@ describe('Tour | Top-Level Class', function() {
 
         assert.equal(instance, Shepherd.activeTour);
       });
+
+      it('adds the current tour\'s "id" property to the body as a data attribute', function() {
+        instance.id = 'test-id';
+        instance.start();
+
+        assert.equal(document.body.hasAttribute('data-shepherd-active-tour'), true);
+        assert.equal(document.body.getAttribute('data-shepherd-active-tour'), 'test-id');
+      });
     });
 
     describe('.getCurrentStep()', function() {