Sharing data with templates: cycle import error

pkg/handlers/handlers.go

@@ -6,6 +6,18 @@ import (
 	"net/http"
 )
 
+// TemplateData holds data sent from handlers to templates
+type TemplateData struct {
+	StringMap map[string]string
+	IntMap    map[string]int
+	FloatMap  map[string]float32
+	Data      map[string]interface{}
+	CSRFToken string
+	Flash     string
+	Warning   string
+	Error     string
+}
+
 // Repo the repository used by the handlers
 var Repo *Repository
 
@@ -28,10 +40,14 @@ func NewHandlers(r *Repository) {
 
 // Home is the about page handler
 func (m *Repository) Home(w http.ResponseWriter, r *http.Request) {
-	render.RenderTemplate(w, "home.page.tmpl")
+	render.RenderTemplate(w, "home.page.tmpl", &TemplateData{})
 }
 
 // About is the about page handler
 func (m *Repository) About(w http.ResponseWriter, r *http.Request) {
-	render.RenderTemplate(w, "about.page.tmpl")
+	// perform some logic
+	stringMap := make(map[string]string)
+	stringMap["test"] = "Hello world!"
+	// send the data to the template
+	render.RenderTemplate(w, "about.page.tmpl", &TemplateData{StringMap: stringMap})
 }

pkg/render/render.go

@@ -3,6 +3,7 @@ package render
 import (
 	"bytes"
 	"go-udemy-web-1/pkg/config"
+	"go-udemy-web-1/pkg/handlers"
 	"html/template"
 	"log"
 	"net/http"
@@ -17,7 +18,7 @@ func NewTemplates(a *config.AppConfig) {
 }
 
 // RenderTemplate renders a HTML template file
-func RenderTemplate(w http.ResponseWriter, tmpl string) {
+func RenderTemplate(w http.ResponseWriter, tmpl string, td *handlers.TemplateData) {
 	var tc map[string]*template.Template
 	if app.UseCache {
 		// get the template cache from the app config

templates/about.page.tmpl

@@ -5,6 +5,8 @@
         <div class="col">
             <h1>This is the about page</h1>
             <p>This is the content</p>
+
+            <p>This came from the template: {{index .StringMap "test"}}</p>
         </div>
     </div>
 </div>