解析来自HTML <form>的输入

Question

I got something running with the Goji framework:

package main

import (
        "fmt"
        "net/http"

        "github.com/zenazn/goji"
        "github.com/zenazn/goji/web"
)

func hello(c web.C, w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello, %s!", c.URLParams["name"])
}

func main() {
        goji.Get("/hello/:name", hello)
        goji.Serve()
}

What I was hoping someone could help me do is figure out how when an HTML form is submitted to send that data to Golang code.

So if there is an input field with the name attribute and the value of that is name and the user types a name in there and submits, then on the form submitted page the Golang code will print hello, name.

Here is what I could come up with:

package main

import(
    "fmt"
    "net/http"

    "github.com/zenazn/goji"
    "github.com/zenazn/goji/web"
)

func hello(c web.C, w http.ResponseWriter, r *http.Request){
    name := r.PostFormValue("name")
    fmt.Fprintf(w, "Hello, %s!", name)
}

func main(){
    goji.Handle("/hello/", hello)
    goji.Serve()
}

and here is my hello.html file:

in the body:

<form action="" method="get">
    <input type="text" name="name" />
</form>

How do I connect hello.html to hello.go so that the Golang code gets what is in the input and returns hello, name in the form submitted page?

I'd greatly appreciate any and all help!

Answer 1

In order to read html form values you have to first call r.ParseForm(). The you can get at the form values.

So this code:

func hello(c web.C, w http.ResponseWriter, r *http.Request){
    name := r.PostFormValue("name")
    fmt.Fprintf(w, "Hello, %s!", name)
}

Should be this:

func hello(c web.C, w http.ResponseWriter, r *http.Request){

    //Call to ParseForm makes form fields available.
    err := r.ParseForm()
    if err != nil {
        // Handle error here via logging and then return            
    }

    name := r.PostFormValue("name")
    fmt.Fprintf(w, "Hello, %s!", name)
}

Edit: I should note that this was a point that tripped me up when learning the net/http package