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elements.go
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elements.go
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package jaws
import (
"html/template"
"strconv"
"strings"
"time"
)
type ClickFn func(rq *Request) error
type InputTextFn func(rq *Request, val string) error
type InputFloatFn func(rq *Request, val float64) error
type InputBoolFn func(rq *Request, val bool) error
type InputDateFn func(rq *Request, val time.Time) error
const ISO8601 = "2006-01-02"
func (rq *Request) inputHTML(id, typ, val, attrs string) template.HTML {
need := 11 + len(id) + 8 + len(typ) + 9 + len(val) + 1 + 1 + len(attrs) + 1
b := make([]byte, 0, need)
b = append(b, `<input id="`...)
b = append(b, id...)
b = append(b, `" type="`...)
b = append(b, typ...)
if val != "" {
b = append(b, `" value="`...)
b = append(b, val...)
}
b = append(b, '"')
if attrs != "" {
b = append(b, ' ')
b = append(b, attrs...)
}
b = append(b, '>')
return template.HTML(b)
}
func (rq *Request) innerHTML(id, tag, typ, inner, attrs string) template.HTML {
need := 1 + len(tag)*2 + 5 + len(id) + 8 + len(typ) + 1 + 1 + len(attrs) + 1 + len(inner) + 2 + 1
b := make([]byte, 0, need)
b = append(b, '<')
b = append(b, tag...)
b = append(b, ` id="`...)
b = append(b, id...)
if typ != "" {
b = append(b, `" type="`...)
b = append(b, typ...)
}
b = append(b, '"')
if attrs != "" {
b = append(b, ' ')
b = append(b, attrs...)
}
b = append(b, '>')
b = append(b, inner...)
b = append(b, "</"...)
b = append(b, tag...)
b = append(b, '>')
return template.HTML(b)
}
func (rq *Request) maybeClick(id string, fn ClickFn) string {
var wf EventFn
if fn != nil {
wf = func(rq *Request, id, evt, val string) (err error) {
if evt == "click" {
err = fn(rq)
}
return
}
}
return rq.RegisterEventFn(id, wf)
}
func (rq *Request) maybeInputText(id string, fn InputTextFn) string {
var wf EventFn
if fn != nil {
wf = func(rq *Request, id, evt, val string) (err error) {
if evt == "input" {
err = fn(rq, val)
}
return
}
}
return rq.RegisterEventFn(id, wf)
}
func (rq *Request) maybeInputFloat(id string, fn InputFloatFn) string {
var wf EventFn
if fn != nil {
wf = func(rq *Request, id, evt, val string) (err error) {
if evt == "input" {
var v float64
if v, err = strconv.ParseFloat(val, 64); err == nil {
err = fn(rq, v)
}
}
return
}
}
return rq.RegisterEventFn(id, wf)
}
func (rq *Request) maybeInputBool(id string, fn InputBoolFn) string {
var wf EventFn
if fn != nil {
wf = func(rq *Request, id, evt, val string) (err error) {
if evt == "input" {
var v bool
if v, err = strconv.ParseBool(val); err == nil {
err = fn(rq, v)
}
}
return
}
}
return rq.RegisterEventFn(id, wf)
}
func (rq *Request) maybeInputDate(id string, fn InputDateFn) string {
var wf EventFn
if fn != nil {
wf = func(rq *Request, id, evt, val string) (err error) {
if evt == "input" {
var v time.Time
if v, err = time.Parse(ISO8601, val); err == nil {
err = fn(rq, v)
}
}
return
}
}
return rq.RegisterEventFn(id, wf)
}
// OnInput registers a HTML id and a function to be called when it's input event fires.
// Returns a nil error so it can be used inside templates.
func (rq *Request) OnInput(id string, fn InputTextFn) error {
rq.maybeInputText(id, fn)
return nil
}
// OnClick registers a HTML id and a function to be called when it's click event fires.
// Returns a nil error so it can be used inside templates.
func (rq *Request) OnClick(id string, fn ClickFn) error {
rq.maybeClick(id, fn)
return nil
}
func (rq *Request) Div(id, inner string, fn ClickFn, attrs string) template.HTML {
return rq.innerHTML(rq.maybeClick(id, fn), "div", "", inner, attrs)
}
func (rq *Request) Span(id, inner string, fn ClickFn, attrs string) template.HTML {
return rq.innerHTML(rq.maybeClick(id, fn), "span", "", inner, attrs)
}
func (rq *Request) Li(id, inner string, fn ClickFn, attrs string) template.HTML {
return rq.innerHTML(rq.maybeClick(id, fn), "li", "", inner, attrs)
}
func (rq *Request) Td(id, inner string, fn ClickFn, attrs string) template.HTML {
return rq.innerHTML(rq.maybeClick(id, fn), "td", "", inner, attrs)
}
func (rq *Request) A(id, inner string, fn ClickFn, attrs string) template.HTML {
return rq.innerHTML(rq.maybeClick(id, fn), "a", "", inner, attrs)
}
func (rq *Request) Button(id, txt string, fn ClickFn, attrs string) template.HTML {
return rq.innerHTML(rq.maybeClick(id, fn), "button", "button", txt, attrs)
}
func (rq *Request) Text(id, val string, fn InputTextFn, attrs string) template.HTML {
return rq.inputHTML(rq.maybeInputText(id, fn), "text", val, attrs)
}
func (rq *Request) Range(id string, val float64, fn InputFloatFn, attrs string) template.HTML {
return rq.inputHTML(rq.maybeInputFloat(id, fn), "range", strconv.FormatFloat(val, 'f', -1, 64), attrs)
}
func (rq *Request) Checkbox(id string, val bool, fn InputBoolFn, attrs string) template.HTML {
if val {
attrs += " checked"
}
return rq.inputHTML(rq.maybeInputBool(id, fn), "checkbox", "", attrs)
}
func (rq *Request) Date(id string, val time.Time, fn InputDateFn, attrs string) template.HTML {
if val.IsZero() {
val = time.Now()
}
return rq.inputHTML(rq.maybeInputDate(id, fn), "date", val.Format(ISO8601), attrs)
}
func radioGroup(id string) string {
if slash := strings.IndexByte(id, '/'); slash != -1 {
return id[slash+1:]
}
panic("radio button ID's must be in the form 'buttonid/groupid'")
}
func (rq *Request) Radio(id string, val bool, fn InputBoolFn, attrs string) template.HTML {
attrs += " name=\"" + radioGroup(id) + "\""
if val {
attrs += " checked"
}
return rq.inputHTML(rq.maybeInputBool(id, fn), "radio", "", attrs)
}
func (rq *Request) Select(id string, val *NamedBoolArray, fn InputTextFn, attrs string) template.HTML {
id = rq.maybeInputText(id, fn)
b := make([]byte, 0, 256)
b = append(b, "<select id=\""...)
b = append(b, id...)
b = append(b, '"')
if attrs != "" {
b = append(b, ' ')
b = append(b, attrs...)
}
b = append(b, ">\n"...)
for _, nb := range *val {
b = append(b, "<option value=\""...)
b = append(b, (nb.Value)...)
if nb.Checked {
b = append(b, "\" selected>"...)
} else {
b = append(b, "\">"...)
}
b = append(b, (nb.Text)...)
b = append(b, "</option>\n"...)
}
b = append(b, "</select>\n"...)
return template.HTML(b)
}