how I can render template multiple times in a handler without return? #2440
Comments
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It's not possible via just using |
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The current functionality in fiber core itself is only designed to render once per route and runs for the majority of cases However, if you need multiple rendering or multiple different engines, you can use them as the core does The respective engines get a buffer for storage of the output data in the egine render method |
Could you give me extra code to understand? |
package main
import (
"fmt"
"log"
"github.com/gofiber/fiber/v2"
"github.com/gofiber/template/handlebars/v2"
"github.com/gofiber/template/html/v2"
"github.com/gofiber/template/jet/v2"
"github.com/valyala/bytebufferpool"
)
func main() {
htmlEngine := html.New("./html", ".html")
handlebarsEngine := handlebars.New("./handlebars", ".hbs")
jetEngine := jet.New("./jet", ".jet")
if err := htmlEngine.Load(); err != nil {
log.Fatalf("[Warning]: failed to load views: %v\n", err)
}
if err := handlebarsEngine.Load(); err != nil {
log.Fatalf("[Warning]: failed to load views: %v\n", err)
}
if err := jetEngine.Load(); err != nil {
log.Fatalf("[Warning]: failed to load views: %v\n", err)
}
app := fiber.New(fiber.Config{
Views: htmlEngine,
})
app.Get("/html", func(ctx *fiber.Ctx) error {
return ctx.Render("index", fiber.Map{"Title": "htmlTemplate"})
})
app.Get("/handlebars", func(ctx *fiber.Ctx) error {
buf := bytebufferpool.Get()
defer bytebufferpool.Put(buf)
if err := handlebarsEngine.Render(buf, "index", fiber.Map{"Title": "handlebarsTemplate"} /** ,Layout parameter **/); err != nil {
return fmt.Errorf("failed to render: %w", err)
}
// Set rendered template to body
return ctx.Type("html").Send(buf.Bytes())
})
app.Get("/jet", func(ctx *fiber.Ctx) error {
buf := bytebufferpool.Get()
defer bytebufferpool.Put(buf)
if err := jetEngine.Render(buf, "index", fiber.Map{"Title": "jetTemplate"} /** ,Layout parameter **/); err != nil {
return fmt.Errorf("failed to render: %w", err)
}
// Set rendered template to body
return ctx.Type("html").Send(buf.Bytes())
})
log.Fatalln(app.Listen(":3000"))
}
handlebars/index.hbs html/index.html <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<h1>{{.Title}}</h1>
</body>
</html>jet/index.jet |
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oh i misread, you didn't want to render with different template engines, you wanted something more dynamic, what you normally get with streaming or websocket connections or polling |
Question Description
Hi everyone,
I have a handler that process large data and I want show and update a progress bar in my html page. How I can render a template multiple times without return from handler?
for example calling c.Render("page", fiber.Map{}) multiple time to update a progressbar.
thanks
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