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## - `FormData` for the JavaScript target: https://developer.mozilla.org/en-US/docs/Web/API/FormData
when not defined(js):
{.fatal: "Module jsformdata is designed to be used with the JavaScript backend.".}
type FormData* = ref object of JsRoot ## FormData API.
func newFormData*(): FormData {.importjs: "new FormData()".}
func add*(self: FormData; name: cstring; value: SomeNumber | bool | cstring) {.importjs: "#.append(#, #)".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/append
## Duplicate keys are allowed and order is preserved.
func add*(self: FormData; name: cstring; value: SomeNumber | bool | cstring, filename: cstring) {.importjs: "#.append(#, #, #)".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/append
## Duplicate keys are allowed and order is preserved.
func delete*(self: FormData; name: cstring) {.importjs: "#.$1(#)".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/delete
##
## .. warning:: Deletes *all items* with the same key name.
func getAll*(self: FormData; name: cstring): seq[cstring] {.importjs: "#.$1(#)".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/getAll
func hasKey*(self: FormData; name: cstring): bool {.importjs: "#.has(#)".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/has
func keys*(self: FormData): seq[cstring] {.importjs: "Array.from(#.$1())".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/keys
func values*(self: FormData): seq[cstring] {.importjs: "Array.from(#.$1())".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/values
func pairs*(self: FormData): seq[tuple[key, val: cstring]] {.importjs: "Array.from(#.entries())".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/entries
func put*(self: FormData; name, value, filename: cstring) {.importjs: "#.set(#, #, #)".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/set
func `[]=`*(self: FormData; name, value: cstring) {.importjs: "#.set(#, #)".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/set
func `[]`*(self: FormData; name: cstring): cstring {.importjs: "#.get(#)".}
## https://developer.mozilla.org/en-US/docs/Web/API/FormData/get
func clear*(self: FormData) {.importjs:
"(() => { const frmdt = #; Array.from(frmdt.keys()).forEach((key) => frmdt.delete(key)) })()".}
## Convenience func to delete all items from `FormData`.
func toCstring*(self: FormData): cstring {.importjs: "JSON.stringify(#)".}
func `$`*(self: FormData): string = $toCstring(self)
func len*(self: FormData): int {.importjs: "Array.from(#.entries()).length".}
runnableExamples("-r:off"):
let data: FormData = newFormData()
data["key0"] = "value0".cstring
data.add("key1".cstring, "value1".cstring)
data.delete("key1")
assert data.hasKey("key0")
assert data["key0"] == "value0".cstring
data.clear()
assert data.len == 0
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