// New creates the HTML for a select menu instance with the specified parameters.
func New(options []string, defaultOption string, query url.Values, queryParameter string) template.HTML {
selectElement := &html.Node{Type: html.ElementNode, Data: "select"}
var selectedOption = defaultOption
if query.Get(queryParameter) != "" {
selectedOption = query.Get(queryParameter)
}
if !contains(options, selectedOption) {
options = append(options, selectedOption)
}
for _, option := range options {
o := &html.Node{Type: html.ElementNode, Data: "option"}
o.AppendChild(htmlg.Text(option))
if option == selectedOption {
o.Attr = append(o.Attr, html.Attribute{Key: "selected"})
}
selectElement.AppendChild(o)
}
selectElement.Attr = append(selectElement.Attr, html.Attribute{
Key: "oninput",
// HACK: Don't use Sprintf, properly encode (as json at this time).
Val: fmt.Sprintf(`SelectMenuOnInput(event, this, %q, %q);`, strconv.Quote(defaultOption), strconv.Quote(queryParameter)),
})
return htmlg.Render(selectElement)
}
func Example() {
// Context-aware escaping is done just like in html/template.
html := htmlg.Render(
htmlg.Text("Hi & how are you, "),
htmlg.A("Gophers", "https://golang.org/"),
htmlg.Text("? <script> is a cool gopher."),
)
fmt.Fprintln(os.Stdout, html)
// Output:
// Hi & how are you, <a href="https://golang.org/">Gophers</a>? <script> is a cool gopher.
}
// New creates the HTML for a checkbox instance. Its checked value is directly connected
// to the presence of queryParameter.
// Changing either the presence of queryParameter, or checking/unchecking the checkbox
// will result in the other updating to match.
func New(defaultValue bool, query url.Values, queryParameter string) template.HTML {
inputElement := &html.Node{
Type: html.ElementNode,
Data: "input",
Attr: []html.Attribute{{Key: "type", Val: "checkbox"}},
}
var selectedValue = defaultValue
if _, set := query[queryParameter]; set {
selectedValue = !selectedValue
}
if selectedValue {
inputElement.Attr = append(inputElement.Attr, html.Attribute{Key: "checked"})
}
inputElement.Attr = append(inputElement.Attr, html.Attribute{
Key: "onchange",
// HACK: Don't use Sprintf, properly encode (as json at this time).
Val: fmt.Sprintf(`CheckboxOnChange(event, this, %v, %q);`, defaultValue, strconv.Quote(queryParameter)),
})
return htmlg.Render(inputElement)
}