20 go
使用html/template我试图在模板中使用我自己的一个函数.不幸的是我无法使用go模板的功能映射功能.我得到的是以下错误:
% go run test.go
panic: template: tmpl.html:5: function "humanSize" not defined
[...]
简化的测试用例如下(test.go):
package main
import (
"html/template"
"io/ioutil"
"net/http"
"strconv"
)
var funcMap = template.FuncMap{
"humanSize": humanSize,
}
var tmplGet = template.Must(template.ParseFiles("tmpl.html")).Funcs(funcMap)
func humanSize(s int64) string {
return strconv.FormatInt(s/int64(1000), 10) + " KB"
}
func getPageHandler(w http.ResponseWriter, r *http.Request) {
files, _ := ioutil.ReadDir(".")
if err := tmplGet.Execute(w, files); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
func main() {
http.HandleFunc("/", getPageHandler)
http.ListenAndServe(":8080", nil)
}
我有以下简单的模板(tmpl.html):
<html><body>
{{range .}}
<div>
<span>{{.Name}}</span>
<span>{{humanSize .Size}}</span>
</div>
{{end}}
</body></html>
这是1.1.1.
zzz*_*zzz 33
IIRC,模板函数映射必须.Funcs在解析模板之前定义.以下代码似乎有效.
package main
import (
"html/template"
"io/ioutil"
"net/http"
"strconv"
)
var funcMap = template.FuncMap{
"humanSize": humanSize,
}
const tmpl = `
<html><body>
{{range .}}
<div>
<span>{{.Name}}</span>
<span>{{humanSize .Size}}</span>
</div>
{{end}}
</body></html>`
var tmplGet = template.Must(template.New("").Funcs(funcMap).Parse(tmpl))
func humanSize(s int64) string {
return strconv.FormatInt(s/int64(1000), 10) + " KB"
}
func getPageHandler(w http.ResponseWriter, r *http.Request) {
files, err := ioutil.ReadDir(".")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if err := tmplGet.Execute(w, files); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
func main() {
http.HandleFunc("/", getPageHandler)
http.ListenAndServe(":8080", nil)
}
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