add datastar examples

2025-12-09 02:30:55 +01:00
parent f6bfd1f7ab
commit 5a43abbdc7
7 changed files with 277 additions and 0 deletions
@@ -0,0 +1,176 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"sort"
+	"strconv"
+
+	"github.com/starfederation/datastar-go/datastar"
+	"github.com/zepyrshut/hrender"
+)
+
+type TodoList struct {
+	ID        int
+	Name      string
+	Completed bool
+}
+
+var todoList = []TodoList{
+	{
+		ID:        1,
+		Name:      "Sacar a la perra",
+		Completed: false,
+	},
+	{
+		ID:        2,
+		Name:      "Limpiar la casa",
+		Completed: false,
+	},
+	{
+		ID:        3,
+		Name:      "Ir al supermercado",
+		Completed: false,
+	},
+}
+
+type TodoSignals struct {
+	NewTodoName string `json:"newtodo"`
+}
+
+func main() {
+	templatesFS := os.DirFS("./templates")
+
+	h := hrender.NewHTMLRender(templatesFS, false)
+
+	mux := http.NewServeMux()
+	mux.Handle("GET /", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set(hrender.ContentType, hrender.ContentTextHTMLUTF8)
+		err := h.RenderW(w, "pages/index", hrender.H{})
+		if err != nil {
+			http.Error(w, "error loading template", http.StatusInternalServerError)
+		}
+	}))
+
+	mux.Handle("GET /todo", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		sort.Slice(todoList, func(i, j int) bool {
+			return todoList[i].ID > todoList[j].ID
+		})
+
+		templ, err := h.RenderS("fragments/todo-widget", hrender.H{
+			"TodoList": todoList,
+		})
+		if err != nil {
+			http.Error(w, "error loading template", http.StatusInternalServerError)
+		}
+
+		sse := datastar.NewSSE(w, r)
+		if err := sse.PatchElements(templ); err != nil {
+			log.Println("error", err)
+		}
+	}))
+
+	mux.Handle("GET /todo/new", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		templ, err := h.RenderS("fragments/todo-row-edit", hrender.H{})
+		if err != nil {
+			http.Error(w, "error loading template", http.StatusInternalServerError)
+		}
+
+		sse := datastar.NewSSE(w, r)
+		if err := sse.PatchElements(templ,
+			datastar.WithModePrepend(),
+			datastar.WithSelectorID("todo-list-body"),
+		); err != nil {
+			log.Println("error", err)
+		}
+	}))
+
+	mux.Handle("POST /todo", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var signals TodoSignals
+		if err := datastar.ReadSignals(r, &signals); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+		}
+
+		newID := 0
+		sort.Slice(todoList, func(i, j int) bool {
+			return todoList[i].ID > todoList[j].ID
+		})
+		newID = todoList[0].ID + 1
+
+		newItem := TodoList{
+			ID:        newID,
+			Name:      signals.NewTodoName,
+			Completed: false,
+		}
+
+		todoList = append(todoList, newItem)
+
+		templ, _ := h.RenderS("fragments/todo-row", hrender.H{
+			"ID":        newID,
+			"Name":      newItem.Name,
+			"Completed": false,
+		})
+
+		sse := datastar.NewSSE(w, r)
+
+		if err := sse.PatchElements(templ,
+			datastar.WithModeReplace(),
+			datastar.WithSelectorID("new-todo-row"),
+		); err != nil {
+			http.Error(w, "bad request", http.StatusBadRequest)
+			return
+		}
+
+		signals.NewTodoName = ""
+		sse.MarshalAndPatchSignals(signals)
+	}))
+
+	mux.Handle("PATCH /todo/{id}/completed", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		log.Println("patch todo triggered")
+
+		idStr := r.PathValue("id")
+		id, err := strconv.Atoi(idStr)
+		if err != nil {
+			http.Error(w, "invalid id", http.StatusBadRequest)
+			return
+		}
+
+		var foundItem *TodoList
+		for i := range todoList {
+			if todoList[i].ID == id {
+				todoList[i].Completed = true
+				foundItem = &todoList[i]
+				break
+			}
+		}
+
+		if foundItem == nil {
+			http.Error(w, "item not found", http.StatusNotFound)
+			return
+		}
+
+		templ, err := h.RenderS("fragments/todo-row", hrender.H{
+			"ID":        foundItem.ID,
+			"Name":      foundItem.Name,
+			"Completed": true,
+		})
+		if err != nil {
+			http.Error(w, "error loading template", http.StatusInternalServerError)
+		}
+
+		sse := datastar.NewSSE(w, r)
+		if err := sse.PatchElements(templ, datastar.WithModeOuter(),
+			datastar.WithSelectorID(fmt.Sprintf("todo-%d", id)),
+		); err != nil {
+			http.Error(w, "error", http.StatusInternalServerError)
+		}
+	}))
+
+	log.Println("server started on port 8080")
+	err := http.ListenAndServe(":8080", mux)
+	if err != nil {
+		panic(fmt.Sprintf("server cannot start %v", err))
+	}
+}