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package client;
import js.html.InputElement;
import js.html.KeyboardEvent;
class InputWithHistory {
final element:InputElement;
final maxItems:Int;
final history:Array<String>;
final onEnter:(value:String) -> Bool;
var historyId = -1;
public function new(
element:InputElement,
?history:Array<String>,
maxItems:Int,
onEnter:(value:String) -> Bool
) {
this.element = element;
if (history != null) this.history = history;
else this.history = [];
this.maxItems = maxItems;
this.onEnter = onEnter;
element.onkeydown = onKeyDown;
}
public static function pushIfNotLast(arr:Array<String>, item:String):Void {
final len = arr.length;
if (len == 0 || arr[len - 1] != item) arr.push(item);
}
function onKeyDown(e:KeyboardEvent) {
final key:KeyCode = cast e.keyCode;
switch (key) {
case Return:
final value = element.value.trim();
if (value.length == 0) return;
final isAdd = onEnter(value);
if (isAdd) pushIfNotLast(history, value);
if (history.length > maxItems) history.shift();
historyId = -1;
element.value = "";
onInput();
case Up:
historyId--;
if (historyId == -2) {
historyId = history.length - 1;
if (historyId == -1) return;
} else if (historyId == -1) historyId++;
element.value = history[historyId];
onInput();
case Down:
if (historyId == -1) return;
historyId++;
if (historyId > history.length - 1) {
historyId = -1;
element.value = "";
} else {
element.value = history[historyId];
}
onInput();
default:
}
}
function onInput():Void {
if (element.oninput != null) element.oninput();
}
}
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