fix #1876

_examples/routing/macros/main.go

@@ -1,4 +1,5 @@
 // Package main shows how you can register a custom parameter type and macro functions that belongs to it.
+// See _examples/routing/dynamic-path/main.go first.
 package main
 
 import (

_examples/view/template_jet_0/main.go

@@ -53,7 +53,7 @@ func (dt *doneTODOs) Range() (reflect.Value, reflect.Value, bool) {
 func (dt *doneTODOs) ProvidesIndex() bool { return true }
 
 func (dt *doneTODOs) Render(r *view.JetRuntime) {
-	r.Write([]byte(fmt.Sprintf("custom renderer")))
+	r.Write([]byte("custom renderer"))
 }
 
 // Render implements jet.Renderer interface
@@ -112,6 +112,7 @@ func main() {
 			return
 		}
 
+		ctx.ViewData("title", "Show TODO")
 		ctx.View("todos/show.jet", todo)
 	})
 	app.Get("/all-done", func(ctx iris.Context) {
@@ -122,7 +123,6 @@ func main() {
 		// ctx.View("todos/index.jet", (&doneTODOs{}).New(todos))
 		//
 		// OR
-
 		ctx.ViewData("showingAllDone", true)
 		ctx.ViewData("title", "Todos - All Done")
 

context/context.go

@@ -3450,9 +3450,7 @@ func (ctx *Context) ViewData(key string, value interface{}) {
 		return
 	}
 
-	if data, ok := v.(map[string]interface{}); ok {
-		data[key] = value
-	} else if data, ok := v.(Map); ok {
+	if data, ok := v.(Map); ok {
 		data[key] = value
 	}
 }
@@ -3467,30 +3465,19 @@ func (ctx *Context) ViewData(key string, value interface{}) {
 // Similarly to `viewData := ctx.Values().Get("iris.view.data")` or
 // `viewData := ctx.Values().Get(ctx.Application().ConfigurationReadOnly().GetViewDataContextKey())`.
 func (ctx *Context) GetViewData() map[string]interface{} {
-	viewDataContextKey := ctx.app.ConfigurationReadOnly().GetViewDataContextKey()
-	v := ctx.values.Get(viewDataContextKey)
-
-	// if no values found, then return nil
-	if v == nil {
-		return nil
-	}
-
-	// if struct, convert it to map[string]interface{}
-	if structs.IsStruct(v) {
-		return structs.Map(v)
-	}
-
-	// if pure map[string]interface{}
-	if viewData, ok := v.(map[string]interface{}); ok {
-		return viewData
-	}
+	if v := ctx.values.Get(ctx.app.ConfigurationReadOnly().GetViewDataContextKey()); v != nil {
+		// if pure map[string]interface{}
+		if viewData, ok := v.(Map); ok {
+			return viewData
+		}
 
-	// if context#Map
-	if viewData, ok := v.(Map); ok {
-		return viewData
+		// if struct, convert it to map[string]interface{}
+		if structs.IsStruct(v) {
+			return structs.Map(v)
+		}
 	}
 
-	// if failure, then return nil
+	// if no values found, then return nil
 	return nil
 }
 

view/jet.go

@@ -334,6 +334,20 @@ func (s *JetEngine) ExecuteWriter(w io.Writer, filename string, layout string, b
 			}
 		}
 
+		if viewContextData := ctx.GetViewData(); len(viewContextData) > 0 { // fix #1876
+			if vars == nil {
+				vars = make(JetRuntimeVars)
+			}
+
+			for k, v := range viewContextData {
+				val, ok := v.(reflect.Value)
+				if !ok {
+					val = reflect.ValueOf(v)
+				}
+				vars[k] = val
+			}
+		}
+
 		if v := ctx.Values().Get(s.jetDataContextKey); v != nil {
 			if bindingData == nil {
 				// if bindingData is nil, try to fill them by context key (a middleware can set data).
@@ -348,6 +362,7 @@ func (s *JetEngine) ExecuteWriter(w io.Writer, filename string, layout string, b
 				}
 			}
 		}
+
 	}
 
 	if bindingData == nil {