forked from vmihailenco/gforms
/
helpers.go
148 lines (126 loc) · 2.95 KB
/
helpers.go
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package gforms
import (
"bytes"
"html/template"
"os"
"path"
"reflect"
"sync"
)
type templatesMap struct {
L sync.RWMutex
M map[string]*template.Template
}
var emptyHTML = template.HTML("")
var templates = &templatesMap{
M: make(map[string]*template.Template),
}
var (
WidgetTemplatePath = rootDir() + "templates/gforms/widget.html"
CheckboxTemplatePath = rootDir() + "templates/gforms/checkbox.html"
RadioTemplatePath = rootDir() + "templates/gforms/radio.html"
)
func rootDir() string {
return os.Getenv("ROOT_DIR")
}
func getTemplate(filepath string) *template.Template {
templates.L.RLock()
t, ok := templates.M[filepath]
if ok {
templates.L.RUnlock()
return t
}
templates.L.RUnlock()
t = template.New(path.Base(filepath))
t = t.Funcs(template.FuncMap{
"field": RenderField,
"label": RenderLabel,
"field_error": RenderError,
})
var err error
t, err = t.ParseFiles(filepath)
if err != nil {
panic(err)
}
templates.L.Lock()
templates.M[filepath] = t
templates.L.Unlock()
return t
}
func RenderErrors(form Form) (template.HTML, error) {
errors := form.Errors()
if len(errors) == 0 {
return emptyHTML, nil
}
fields := form.Fields()
s := ""
for name, e := range errors {
field, ok := fields[name]
if name == "" || (ok && field.Widget().IsHidden()) {
s += `<div class="alert alert-error">` + e.Error() + `</div>` + "\n"
}
}
return template.HTML(s), nil
}
func Render(field Field, attrs ...string) (template.HTML, error) {
if reflect.ValueOf(field).IsNil() {
return emptyHTML, nil
}
data := struct {
Field Field
Attrs []string
Radios []template.HTML
}{
Field: field,
Attrs: attrs,
}
var t *template.Template
switch widget := field.Widget().(type) {
case *HiddenWidget:
return RenderField(field, attrs)
case *CheckboxWidget:
t = getTemplate(CheckboxTemplatePath)
case *RadioWidget:
data.Radios = widget.Radios(attrs, field.(SingleValueField).StringValue())
t = getTemplate(RadioTemplatePath)
default:
t = getTemplate(WidgetTemplatePath)
}
buf := &bytes.Buffer{}
if err := t.Execute(buf, data); err != nil {
return emptyHTML, err
}
return template.HTML(buf.String()), nil
}
func RenderError(f Field) (template.HTML, error) {
err := f.ValidationError()
if err == nil {
return emptyHTML, nil
}
s := `<span class="help-inline">` + err.Error() + `</span>`
return template.HTML(s), nil
}
func RenderLabel(f Field) (template.HTML, error) {
label := f.Label()
if label == "" {
return emptyHTML, nil
}
if f.IsRequired() {
label += "*"
}
s := `<label class="control-label" for="` + f.Name() + `">` + label + `</label>`
return template.HTML(s), nil
}
func RenderField(f Field, attrs []string) (template.HTML, error) {
return f.Render(attrs...), nil
}
func RenderHiddenFields(form Form) (template.HTML, error) {
fields := form.Fields()
var html template.HTML
for _, field := range fields {
if field.Widget().IsHidden() {
html += field.Render()
}
}
return html, nil
}