feat: enabling the extraction of a specific selection from an element

js/modules/k6/html/element.go

@@ -246,6 +246,18 @@ func (e Element) IsSameNode(v goja.Value) bool {
 	return false
 }
 
+// Selection returns a Selection object based on the current Element.
+//
+// This function is used to create a Selection object that represents the same HTML
+// content as the Element. It is useful for performing operations or manipulations
+// on the HTML content within the scope of this Element.
+//
+// Example:
+// sel := element.Selection()
+func (e Element) Selection() Selection {
+	return Selection{rt: e.sel.rt, sel: e.sel.sel, URL: e.sel.URL}
+}
+
 func (e Element) GetElementsByClassName(name string) []goja.Value {
 	return elemList(Selection{e.sel.rt, e.sel.sel.Find("." + name), e.sel.URL})
 }

js/modules/k6/html/element_test.go

@@ -228,6 +228,15 @@ func TestElement(t *testing.T) {
 			assert.Contains(t, nodes[3].Export().(Element).TextContent(), "Maecenas augue ligula")
 		}
 	})
+	t.Run("Selection", func(t *testing.T) {
+		t.Parallel()
+		rt := getTestRuntimeWithDoc(t, testHTMLElem)
+
+		v, err := rt.RunString(`doc.find('div').get(0).selection().find('h2').text()`)
+		if assert.NoError(t, err) {
+			assert.Equal(t, "Nullam id nisi eget ex pharetra imperdiet.", v.String())
+		}
+	})
 	t.Run("ClassList", func(t *testing.T) {
 		t.Parallel()
 		rt := getTestRuntimeWithDoc(t, testHTMLElem)

js/modules/k6/html/html.go

@@ -280,6 +280,26 @@ func (s Selection) Last() Selection {
 	return Selection{s.rt, s.sel.Last(), s.URL}
 }
 
+// FromElement creates a new Selection based on a specified Element.
+//
+// This function is useful for creating a new Selection object that
+// encapsulates the same HTML structure as the provided Element. It
+// is particularly helpful when you need to perform further operations
+// or manipulations on the HTML content within the scope of this Element.
+// If the provided value is not an Element, an empty Selection is returned.
+//
+// Example:
+// sel := existingSelection.FromElement(jsElement)
+func (s Selection) FromElement(v goja.Value) Selection {
+	elm, ok := v.Export().(Element)
+	if !ok {
+		// Return an empty Selection if the value is not an Element
+		return s.emptySelection()
+	}
+
+	return Selection{rt: s.rt, sel: elm.sel.sel, URL: s.URL}
+}
+
 func (s Selection) Contents() Selection {
 	return Selection{s.rt, s.sel.Contents(), s.URL}
 }

js/modules/k6/html/html_test.go

@@ -269,6 +269,18 @@ func TestParseHTML(t *testing.T) {
 			assert.Equal(t, "form1", v.Export())
 		}
 	})
+	t.Run("FromElement", func(t *testing.T) {
+		t.Parallel()
+		rt := getTestRuntimeWithDoc(t, testHTML)
+
+		_, err := rt.RunString(`var body = doc.find("body").get(0)`)
+		assert.NoError(t, err)
+
+		v, err := rt.RunString(`doc.fromElement(body).find('#top').text()`)
+		if assert.NoError(t, err) {
+			assert.Equal(t, "Lorem ipsum", v.String())
+		}
+	})
 	t.Run("Contents", func(t *testing.T) {
 		t.Parallel()
 		rt := getTestRuntimeWithDoc(t, testHTML)