Using custom functions in html/template

[Alex Sinelnikov]

I'm trying to add custom function using FuncMap:

var funcMap = template.FuncMap{
   "sayHello": sayHello,
 }

 func sayHello() string {
 return "Hello World"
 }
tmpl, err := template.New("base").Funcs(funcMap).ParseFiles(html_path)
tmpl.Execute(writer, nil)

In html file i have

{{ sayHelo }}

This throws me an error

runtime error: invalid memory address or nil pointer dereference.

What am i doing wrong?

[Tamás Gulácsi]

Misspell.

[Alex Sinelnikov]

In my html code, there's a misspell, but thats just wrongly copied. In my code, everything spelled correctly

воскресенье, 14 июня 2015 г., 17:16:45 UTC+3 пользователь Alex Sinelnikov написал:

[Alex Sinelnikov]

Thanks, but that was a typo in code in this thread. 

воскресенье, 14 июня 2015 г., 17:25:29 UTC+3 пользователь Tamás Gulácsi написал:

Misspell.

[Kiki Sugiaman]

Once you do:

var funcMap = template.FuncMap{
   "whatEver": sayHello,
}

Then you invoke in html using {{.whatEver}}, because now you invoke using the map's key, not its value.





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[Kiki Sugiaman]

sigh, was drunk while giving answer.
I'll just leave a note here to invalidate my previous reply that everything should work without the typo.

[Alex Sinelnikov]

i guess there's something wrong with that map by itself. Ill check and return with more info

воскресенье, 14 июня 2015 г., 17:16:45 UTC+3 пользователь Alex Sinelnikov написал:

I'm trying to add custom function using FuncMap:

[Alex Sinelnikov]

So, i've checked my map,

map[whatEver:0x400b0]

funcMap["whatEver"]  =>

0x400b0

so key, val exists, and address returns. What else am i missing?

воскресенье, 14 июня 2015 г., 21:15:33 UTC+3 пользователь ksug написал:

[Kiki Sugiaman]

Well, yes. That's the address of the function.

But copy-paste of your snippet works just fine:
http://play.golang.org/p/WpnEXoF-6V

The reason for my first "auto-pilot" reply was because I've gotten used to passing regular map (when I don't care about efficiency) into Execute().

--

[Alex Sinelnikov]

I've found root of problem, here is description

https://groups.google.com/forum/#!topic/golang-nuts/vmZHHfLsH8M

воскресенье, 14 июня 2015 г., 23:16:37 UTC+3 пользователь ksug написал:

[Ignacio Grande]

I recently had exactly the same problem by the same reason. I found the answer in Stack Overflow: http://stackoverflow.com/questions/10199219/go-template-function

 I think that this behaviour should be better documented.