GA4: Fix ecommerce tracking of searches without query

CHANGELOG.md

@@ -7,6 +7,10 @@
   useful summary for people upgrading their application, not a replication
   of the commit log.
 
+## Unreleased
+
+* Fix ecommerce tracking of searches without query ([PR #4317](https://github.com/alphagov/govuk_publishing_components/pull/4317))
+
 ## 44.4.1
 
 * Add chartkick path to gemspec ([PR #4312](https://github.com/alphagov/govuk_publishing_components/pull/4312))

app/assets/javascripts/govuk_publishing_components/analytics-ga4/ga4-core.js

@@ -333,7 +333,7 @@ window.GOVUK.analyticsGa4 = window.GOVUK.analyticsGa4 || {};
         var element = data.element
         var resultsId = data.resultsId
         var isClickEvent = data.event !== undefined
-        var isSearchResult = element.getAttribute('data-ga4-search-query')
+        var isSearchResult = element.getAttribute('data-ga4-search-query') !== null
 
         var ecommerceSchema = new window.GOVUK.analyticsGa4.Schemas().ecommerceSchema()
         var DEFAULT_LIST_TITLE = 'Smart answer results'

spec/javascripts/govuk_publishing_components/analytics-ga4/ga4-core.spec.js

@@ -629,6 +629,36 @@ describe('GA4 core', function () {
         expect(builtEcommerceObject).toEqual(expectedEcommerceObject)
       })
 
+      it('tracks variant and term for search results', function () {
+        resultsParentEl.setAttribute('data-ga4-search-query', 'search term')
+        resultsParentEl.setAttribute('data-ga4-ecommerce-variant', 'upside-down')
+
+        expectedEcommerceObject.search_results.term = 'search term'
+        expectedEcommerceObject.search_results.sort = 'upside-down'
+
+        var builtEcommerceObject = GOVUK.analyticsGa4.core.ecommerceHelperFunctions.populateEcommerceSchema({
+          element: resultsParentEl,
+          resultsId: 'result-count'
+        })
+
+        expect(builtEcommerceObject).toEqual(expectedEcommerceObject)
+      })
+
+      it('tracks variant and term for search results even when query is blank', function () {
+        resultsParentEl.setAttribute('data-ga4-search-query', '')
+        resultsParentEl.setAttribute('data-ga4-ecommerce-variant', 'upside-down')
+
+        expectedEcommerceObject.search_results.term = undefined
+        expectedEcommerceObject.search_results.sort = 'upside-down'
+
+        var builtEcommerceObject = GOVUK.analyticsGa4.core.ecommerceHelperFunctions.populateEcommerceSchema({
+          element: resultsParentEl,
+          resultsId: 'result-count'
+        })
+
+        expect(builtEcommerceObject).toEqual(expectedEcommerceObject)
+      })
+
       it('the ecommerce items array is limited to a maximum of 15,000 UTF-16 code units', function () {
         var innerHTML = ''
         var ecommerceItems = []