formbinder

Iris Form Binder for context.ReadForm

form-binder is a clone of the formam package, slightly edited to use the "form" tag instead of "formam".

Features

• Nesting ad infinitum in maps, structs and slices.
• UnmarshalText in values and keys of maps.
• the map's key supported are: string, int and variants, uint and variants, uintptr, float32, float64, bool, struct, custom types to one of the above types registered by function or UnmarshalText method, a pointer to one of the above types
• A field with interface{} that has a map, struct or slice as value is perfectly possible access to them! (see example below)
• decode time.Time with format "2006-01-02" by its UnmarshalText method.
• decode url.URL
• The slice and array is possible to access without to indicate a index (If it is the last field, of course)`
• You can to register a func for a custom type for all fields that include it or one in particular! (see example below)

Types

The supported field types in the destination struct are:

• string
• bool
• int, int8, int16, int32, int64
• uint, uint8, uint16, uint32, uint64
• float32, float64
• slice, array
• struct and struct anonymous
• map
• interface{}
• time.Time
• url.URL
• custom types to one of the above types
• a pointer to one of the above types

NOTE: the nesting in maps, structs and slices can be ad infinitum.

Usage

Client-side - in form html

• Use symbol . for access a field of a struct. (i.e, struct.field1)
• Use [<index>] for access to index of a slice/array. (i.e, struct.array[0]). If the array/slice is the last field of the path, it is not necessary to indicate the index
• Use [<key>] for access to key of a map. (i.e, struct.map[es-ES]).

<!-- file: views/form.html -->
<form method="POST">
  <input type="text" name="Name" value="Sony"/>
  <input type="text" name="Location.Country" value="Japan"/>
  <input type="text" name="Location.City" value="Tokyo"/>
  <input type="text" name="Products[0].Name" value="Playstation 4"/>
  <input type="text" name="Products[0].Type" value="Video games"/>
  <input type="text" name="Products[1].Name" value="TV Bravia 32"/>
  <input type="text" name="Products[1].Type" value="TVs"/>
  <input type="text" name="Founders[0]" value="Masaru Ibuka"/>
  <input type="text" name="Founders[0]" value="Akio Morita"/>
  <input type="text" name="Employees" value="90000"/>
  <input type="text" name="public" value="true"/>
  <input type="url" name="website" value="http://www.sony.net"/>
  <input type="date" name="foundation" value="1946-05-07"/>
  <input type="text" name="Interface.ID" value="12"/>
  <input type="text" name="Interface.Name" value="Go Programming Language"/>
  <input type="submit"/>
</form>

Server-Side - in iris app

// file: main.go
package main

import (
    "net/url"
    "time"

    "github.com/kataras/iris"
)

type InterfaceStruct struct {
    ID   int
    Name string
}

type Company struct {
  Public     bool      `form:"public"`
  Website    url.URL   `form:"website"`
  Foundation time.Time `form:"foundation"`
  Name       string
  Location   struct {
    Country  string
    City     string
  }
  Products   []struct {
    Name string
    Type string
  }
  Founders   []string
  Employees  int64

  Interface interface{}
}

func main() {
    app := iris.New()
    app.RegisterView(iris.HTML("./views", ".html"))

    app.Get("/", func(ctx iris.Context) {
        ctx.View("form.html")
    })

    // IMPORTANT
    app.Post("/", func(ctx iris.Context) {
        m := Company{
            Interface: &InterfaceStruct{}, // its is possible to access to the fields although it's an interface field!
        }
        err := ctx.ReadForm(&m)
        if err != nil {
            ctx.StatusCode(iris.StatusBadRequest)
            ctx.WriteString(err.Error())
        }
    })
}