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event.js
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event.js
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/// <reference path="../_definitions.d.ts" />
define(["require", "exports", "knockout"], function (require, exports, ko) {
var doc = document;
/** Trigger event of given type on the target element */
function trigger(element, eventType, eventArgs) {
var evt;
if (doc.createEvent) {
evt = doc.createEvent("HTMLEvents");
evt.initEvent(eventType, true, true);
}
else {
evt = doc.createEventObject();
evt.eventType = eventType;
}
evt.eventName = eventType;
ko.utils.extend(evt, eventArgs);
if (doc.createEvent) {
element.dispatchEvent(evt);
}
else {
element.fireEvent("on" + evt.eventType, evt);
}
}
exports.trigger = trigger;
/** Attach the given handler to given event types */
function attach(element, eventTypes, handler) {
var types = eventTypes.split(" ");
for (var t = 0, len = types.length; t < len; t++) {
if (element.addEventListener) {
element.addEventListener(types[t], handler, false);
}
else if (doc.attachEvent) {
element.attachEvent("on" + types[t], handler);
}
}
}
exports.attach = attach;
/** Detach the given handler from given event types */
function detach(element, eventTypes, handler) {
var types = eventTypes.split(" ");
for (var t = 0, len = types.length; t < len; t++) {
if (element.removeEventListener) {
element.removeEventListener(types[t], handler, false);
}
else if (doc.detachEvent) {
element.detachEvent("on" + types[t], handler);
}
}
}
exports.detach = detach;
/** Attach the given handler to given event types and detach it on the first call */
function once(element, eventTypes, handler) {
var fn = function () {
handler.apply(this, arguments);
detach(element, eventTypes, fn);
};
attach(element, eventTypes, fn);
}
exports.once = once;
/** Check existence of given event name */
function check(eventName) {
var tagnames = { "select": "input", "change": "input", "submit": "form", "reset": "form", "error": "img", "load": "img", "abort": "img" };
var element = doc.createElement(tagnames[eventName] || "div");
eventName = "on" + eventName;
var isSupported = (eventName in element);
if (!isSupported) {
element.setAttribute(eventName, "return;");
isSupported = typeof element[eventName] === "function";
}
element = null;
return isSupported;
}
exports.check = check;
function stopPropagation(event) {
if (!event)
event = window.event;
if (event.stopPropagation)
event.stopPropagation();
else
event.cancelBubble = true;
}
exports.stopPropagation = stopPropagation;
function preventDefault(event) {
if (!event)
event = window.event;
if (event.preventDefault)
event.preventDefault();
event.returnValue = false;
return false;
}
exports.preventDefault = preventDefault;
function getTarget(event) {
if (!event)
event = window.event;
return event.target || event.srcElement;
}
exports.getTarget = getTarget;
});