getting checkbox values with r.FormValue

[will]

Dear Gophers,

I have the following scenario in a web form

<input type="checkbox" name="cars" value="mercedes" >Mercedes<br>

<input type="checkbox" name="cars" value="bmw" >BMW<br>

In golang if i try:

var myCars []string = r.FormValue("cars"), wont work. What should i use to get the values of all the selected vehicles (assuming more than one is selected

[James Bardin]

On Friday, February 12, 2016 at 12:08:08 PM UTC-5, will wrote:

var myCars []string = r.FormValue("cars"), wont work. What should i use to get the values of all the selected vehicles (assuming more than one is selected

r.ParseForm()

cars := r.Form["cars"]

From the form value docs: https://golang.org/pkg/net/http/#Request.FormValue

> To access multiple values of the same key, call ParseForm and then inspect Request.Form directly. 

[will]

I get the error cannot call non-function r.Form (type url.Values)

[Shawn Milochik]

Please post some working code (as minimal as possible) duplicating the problem.

And it's r.ParseForm(), then cars := r.FormValue("cars"); I believe that was a typo in the advice above.

[James Bardin]

On Fri, Feb 12, 2016 at 12:27 PM, will <wma...@gmail.com> wrote:
> I get the error cannot call non-function r.Form (type url.Values)

Request.Form isn't a function, is of type url.Values, which is a
map[string][]string. The FormValue method only returns the first
element of the []string.
https://golang.org/src/net/http/request.go?s=28248:28294#L933

[will]

Hi James,

Thanks for your input.

Here is what worked:

var myCars []string

r.ParseForm()

for key, values := range r.Form { 

for _, value := range values {

if key == "cars" {

myCars = append(myCars, value)

[Carlos Alberto Costa Beppler]

I thnk that this would work too

var myCars []string

myCars = r.Form["cars"]

[James Bardin]

Why not simply?

myCars := r.Form["cars"]

or if myCars already contains items,

myCars = append(myCars, r.Form["cars"]...)

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[will]

Carlos and James

You are both right.

i was trying myCars := r.Form("cars") instead of  myCars := r.Form["cars"] //Note the square brackets

I really suggest they update the documentation with such easy examples.

Thanks, it works really well

[Konstantin Khomoutov]

On Fri, 12 Feb 2016 11:36:00 -0800 (PST)
will <wma...@gmail.com> wrote:

> Carlos and James
> You are both right.
> i was trying myCars := r.Form("cars") instead of myCars := r.Form
> ["cars"] //Note the square brackets
>
> I really suggest they update the documentation with such easy
> examples.

I'm afraid that's not realistically possible.
The docs clearly state that Form is a map[string]string,
and you're supposed to have completed at least some entry-level
tutorial on Go which would certainly contain a section on using
maps in Go. The API docs assume working knowledge of the language
itself and can't go all the way down to the basics--otherwise any
example in API docs would contain a tutorial on Go in it.