vanillajs-browser-helpers/once.js

Collection of convenience code snippets (helpers) that aims to make it a little easier to work with vanilla JS in the browser

"use strict";
var __rest = (this && this.__rest) || function (s, e) {
    var t = {};
    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
        t[p] = s[p];
    if (s != null && typeof Object.getOwnPropertySymbols === "function")
        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
                t[p[i]] = s[p[i]];
        }
    return t;
};
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var isEventTarget_1 = __importDefault(require("./isEventTarget"));
var eventOptionsSupported_1 = __importDefault(require("./eventOptionsSupported"));
var on_1 = __importDefault(require("./on"));
var off_1 = __importDefault(require("./off"));
var manuelOnce = function (elm, handler, when) {
    var offHandler = function (e) {
        if (when && when(e) !== true) {
            return true;
        }
        (0, off_1.default)(elm, e.type, offHandler);
        return 'handleEvent' in handler
            ? handler.handleEvent(e)
            : handler(e);
    };
    return offHandler;
};
var bind = function (elm, eventNames, handler, options) {
    var noOptions = !(0, eventOptionsSupported_1.default)();
    var _a = options || {}, when = _a.when, eventOptions = __rest(_a, ["when"]);
    eventOptions.once = !when;
    var eventHandler = when || noOptions
        ? manuelOnce(elm, handler, when)
        : handler;
    (0, on_1.default)(elm, eventNames, eventHandler, eventOptions);
    return function () { return (0, off_1.default)(elm, eventNames, eventHandler, eventOptions); };
};
function once(elm, eventNames, handler, options) {
    if (!(0, isEventTarget_1.default)(elm)) {
        options = handler;
        handler = eventNames;
        eventNames = elm;
        elm = document;
    }
    return bind(elm, eventNames, handler, options);
}
exports.default = once;