#172 Added SCROLL_TOP and SCROLL_BOTTOM (#174)

CHANGELOG.md

@@ -4,6 +4,7 @@
 #### Added
 - DateTime functions.
 - ``PAGINATION`` function.
+- ``SCROLL_TOP`` and ``SCROLL_BOTTOM`` functions.
 
 #### Fixed
 - Unable to define variables and make function calls before FILTER, SORT and etc statements.

pkg/html/dynamic/document.go

@@ -810,6 +810,30 @@ func (doc *HTMLDocument) CaptureScreenshot(params *ScreenshotArgs) (core.Value,
 	return values.NewBinary(reply.Data), nil
 }
 
+func (doc *HTMLDocument) ScrollTop() error {
+	_, err := eval.Eval(doc.client, `
+		window.scrollTo({
+			left: 0,
+			top: 0,
+    		behavior: 'smooth'
+  		});
+	`, false, false)
+
+	return err
+}
+
+func (doc *HTMLDocument) ScrollBottom() error {
+	_, err := eval.Eval(doc.client, `
+		window.scrollTo({
+			left: 0,
+			top: window.document.body.scrollHeight,
+    		behavior: 'smooth'
+  		});
+	`, false, false)
+
+	return err
+}
+
 func (doc *HTMLDocument) handlePageLoad(_ interface{}) {
 	doc.Lock()
 	defer doc.Unlock()

pkg/stdlib/html/lib.go

@@ -34,6 +34,8 @@ func NewLib() map[string]core.Function {
 		"INNER_TEXT_ALL":   InnerTextAll,
 		"SELECT":           Select,
 		"SCREENSHOT":       Screenshot,
+		"SCROLL_TOP":       ScrollTop,
+		"SCROLL_BOTTOM":    ScrollBottom,
 		"PAGINATION":       Pagination,
 		"PDF":              PDF,
 		"DOWNLOAD":         Download,

pkg/stdlib/html/scroll.go

@@ -0,0 +1,56 @@
+package html
+
+import (
+	"context"
+	"github.com/MontFerret/ferret/pkg/html/dynamic"
+	"github.com/MontFerret/ferret/pkg/runtime/core"
+	"github.com/MontFerret/ferret/pkg/runtime/values"
+)
+
+// ScrollTop Scrolls the document's window to its top.
+// @param doc (Document) - Target document.
+func ScrollTop(_ context.Context, args ...core.Value) (core.Value, error) {
+	err := core.ValidateArgs(args, 1, 1)
+
+	if err != nil {
+		return values.None, err
+	}
+
+	err = core.ValidateType(args[0], core.HTMLDocumentType)
+
+	if err != nil {
+		return values.None, err
+	}
+
+	doc, ok := args[0].(*dynamic.HTMLDocument)
+
+	if !ok {
+		return values.None, core.Errors(core.ErrInvalidType, ErrNotDynamic)
+	}
+
+	return values.None, doc.ScrollTop()
+}
+
+// ScrollTop Scrolls the document's window to its bottom.
+// @param doc (Document) - Target document.
+func ScrollBottom(_ context.Context, args ...core.Value) (core.Value, error) {
+	err := core.ValidateArgs(args, 1, 1)
+
+	if err != nil {
+		return values.None, err
+	}
+
+	err = core.ValidateType(args[0], core.HTMLDocumentType)
+
+	if err != nil {
+		return values.None, err
+	}
+
+	doc, ok := args[0].(*dynamic.HTMLDocument)
+
+	if !ok {
+		return values.None, core.Errors(core.ErrInvalidType, ErrNotDynamic)
+	}
+
+	return values.None, doc.ScrollBottom()
+}