Develop Reference

jQuery mouse event blocks default propagation

I have an issue with a full-body-overlay effect when clicking on any link.
The wanted effect is:
when any link of the page is "pushed" (mousedown or touchstart), an image overlay appears on the top of the whole body (hiding the complete content of the page)
when the link is (or should be) "released" (mouseup or touchend), the overlay should disappear and the original clicked link target should happen (the "href" attribute must be followed for instance).
The first part is OK: I added an event handler listening the "mousedown touchstart" events on every links. The second part is more complicated as the overlay does not trigger the "release" action of the link (the overlay is over the content with the link). So I attached a "mousedown touchend" event handler on the whole document, which works, but the default behavior of the clicked link (go to its "href" attribute for instance) is never fired :(
Here is my JS:
$(document).ready(function(){
// the full-page overlay selector
var $overlay = $('.body-overlay');
// a flag to keep a trace of clicked element
var overlay_triggered = false;
// the "mousedown" event handler
function show_overlay(evt)
{
var $target = $(evt.target);
if (overlay_triggered === false) {
$overlay.show();
overlay_triggered = $target;
$(document).on('mouseup touchend', hide_overlay);
}
return true;
}
// the "mouseup" event handler
function hide_overlay(evt)
{
if (overlay_triggered !== false) {
$(document).off('mouseup touchend', hide_overlay);
$overlay.hide();
// !!! - here I try to trigger a classic click but it never works
$(overlay_triggered).click();
overlay_triggered = false;
}
return true;
}
// attachment of the mousedown handler on all links
$(document).on('mousedown touchstart', 'a', show_overlay);
});
I made a JS Fiddle to show it more clearly.
Does someone know about any mistake here ? Is my logic wrong ?

The problem is caused by the way jQuery executes .click(). It is a shortcut for jQuery's trigger('click') method, and this is what the documentation says:
Although .trigger() simulates an event activation, complete with a synthesized event object, it does not perfectly replicate a naturally-occurring event.
The solution is to call the click method on the DOM element itself. It seems though that the MDN documentation announces the same limitations apply to that method:
The HTMLElement.click() method simulates a mouse click on an element.
However, the click() method will not initiate navigation on an <a> element.
...but in trying this with the current versions of Firefox, Chrome and Edge, the DOM click method does launch the <a> navigation (also when href has a http URL).
So, change this:
overlay_triggered = $target;
to:
overlay_triggered = evt.target;
And change this (which was overkill anyway):
$(overlay_triggered).click();
to:
overlay_triggered.click();
See the updated jsfiddle.

I am not exactly sure why this won't work but I got it working by changing $(overlay_triggered).click(); to window.location = $(overlay_triggered).attr("href");

I have slightly modified the JS part of yours, and all is okay now
The thing i did is holding the target's href value in a variable ( I stored the target's href value in 'href' vaiable in the code below ), and after that "window.location = href;" in 'hide_overlay' function does the trick.
<script>
$(document).ready(function(){
// the full-page overlay selector
var $overlay = $('.body-overlay');
// a flag to keep a trace of clicked element
var overlay_triggered = false;
var href = false;
// the "mousedown" event handler
function show_overlay(evt)
{
var $target = $(evt.target);
href = evt.target.href;
if (overlay_triggered === false) {
$overlay.show();
overlay_triggered = $target;
$(document).on('mouseup touchend', hide_overlay);
}
return true;
}
// the "mouseup" event handler
function hide_overlay(evt)
{
if (overlay_triggered !== false) {
$(document).off('mouseup touchend', hide_overlay);
$overlay.hide();
// !!! - here I try to trigger a classic click but it never works
if( href ) {
window.location = href;
}
overlay_triggered = false;
}
return true;
}
// attachment of the mousedown handler on all links
$(document).on('mousedown touchstart', 'a', show_overlay);
});
</script>

Prevent all javascript events from firing

I am working on a firebug like javascript element selector, but cannot figure out how to stop all JavaScript events from firing when clicked. The firebug lite plugin (https://getfirebug.com/firebuglite) is doing exactly what I want, but cannot figure out what they are doing.
Any help would be appreciated.
Senario:
User selects element inspector
User clicks on element
onClick, mousedown, mouseup should NOT fire
I have tried the following with no luck:
function stopEvents(el){
for(var key in window) {
if (key.indexOf("on") == 0)
el.addEventListener(key.substr(2), stop, false);
}
}
function StopEvent(pE)
{
stopEvents(pE);
if (!pE)
if (window.event)
pE = window.event;
else
return;
if (pE.cancelBubble != null)
pE.cancelBubble = true;
if (pE.stopPropagation)
pE.stopPropagation();
if (pE.preventDefault)
pE.preventDefault();
if (window.event)
pE.returnValue = false;
if (pE.cancel != null)
pE.cancel = true;
}
EDIT:
$('.somediv').on("click", function(e){
//Stop bubbling and propagation
StopEvent(e);
//EDIT: Still not working with this
e.stopImmediatePropagation();
//RUN only my code here
console.log("My code is running still");
return false;
});
If there is another library such as YUI binding events to the same DOM element. It will fire there event after mine. I cannot seem to hijack the event to stop this from happening.
EDIT:
I cannot use disabled because I need to be able to fire my event. If I did the following, I wouldn't be able to fire the above event. I cannot attach a parent event either because the DOM will stop firing all events on the Tree for that node.
$('.somediv').on("mouseover", function(e){
$(this).attr("disabled", "disabled");
});
EDIT:
The events I want to disable are already created before my script runs. These events could be any javascript library such as YUI, Dojo, jQuery, JavaScript etc...

Disabling all events on the page is very easy. Hard part is to restore them when needed.
document.body.innerHTML = document.body.innerHTML;
This will effectively remove all events bound to DOM nodes by replacing the DOM with it's "virgin" copy.
Most of the time user won't even notice the redraw.

You can't "disable" all of them without also intercepting the actual event binding, so you'd have to end up with something like this:
(function(prototypes) {
prototypes.forEach(function(prototype) {
var eventTracker = {};
var oldAEL = prototype.addEventListener;
prototype.addEventListener = function(a,b,c) {
if (!eventTracker[a]) { eventTracker[a] = true; }
return oldAEL.call(this, a, function(evt) {
console.log(a, eventTracker[a]);
if(eventTracker[a] === true) {
b(evt);
}
},c);
};
prototype.toggleEvent = function(name, state) {
eventTracker[name] = state;
};
});
}([Document.prototype, HTMLElement.prototype, ...]));
example: http://jsfiddle.net/BYSdP/1/
the button gets three click listeners, but if the second button is clicked, the event regulator for "click" is set to false, so none of the events will actually trigger the originally supplied code. Note that this also makes debugging a LOT harder, because you're wrapping handlers in anonymous functions.

event.stopImmediatePropagation() keeps the rest of the handlers from being executed and prevents the
event from bubbling up the DOM tree.
Example:
$( "p" ).click(function( event ) {
event.stopImmediatePropagation();
});
$( "p" ).click(function( event ) {
// This function won't be executed
$( this ).css( "background-color", "#f00" );
});
Source: https://api.jquery.com/event.stopimmediatepropagation/

click outside DIV

<body>
<div id="aaa">
<div id="bbb">
</div>
</div>
</body>
$(#?????).click(function(){
$('#bbb').hide();
})
http://jsfiddle.net/GkRY2/
What i must use if i want hide #bbb if user click outside box #bbb? But if i click on div #bbb then box is still visible - only outside.

$('body').click(function(e){
if( e.target.id == 'bbb' )
{ return true; }
else
{ $('#bbb').hide(); }
});
A note of explanation: There are a few ways to do this, either way we need to listen for a click on a parent element, weather it be a direct parent like #aaa or a distant parent like the body or the document. This way we can capture clicks that occur outside of #bbb.
Now that we have that we need the .hide to NOT occur if the user did click inside of #bbb. We can do this two ways
Stop propagation if the user clicks on #bbb. This will make the click event not 'bubble' up to the parent. That way the click event never reaches the parent and so #bbb will not hide. I personally don't like this method because stop propagation will so ALL click events from bubbling, and you may have click events that you would like to bubble to a local parent and not a distant parent. Or you may have listeners delegated from a distant parent, which will stop working if click propagation is stopped.
Check for the #bbb element in the parent listener. This is the method shown above. Basically this listens on a distant parent, and when a click occurs it checks to see if that click is on #bbb specifically. If it IS NOT on #bbb .hide is fired, otherwise it returns true, so other things that may be tied into the click event will continue working. I prefer this method for that reason alone, but secondarily its a-little bit more readable and understandable.
Finally the manner in which you check to see if the click originated at #bbb you have many options. Any will work, the pattern is the real meat of this thing.
http://jsfiddle.net/tpBq4/ //Modded from #Raminson who's answer is very similar.
New suggestion, leverage event bubbling without jQuery.
var isOutSide = true
bbb = documment.getElementById('bbb');
document.body.addEventListener('click', function(){
if(!isOutSide){
bbb.style.display = 'none';
}
isOutSide = true;
});
bbb.addEventListener('click', function(){
isOutSide = false;
});

Catch the click event as it bubbles-up to the document element. When it hits the document element, hide the element. Then in a click event handler for the element, stop the propagation of the event so it doesn't reach the document element:
$(function () {
$(document).on('click', function () {
$('#bbb').hide();
});
$('#bbb').on('click', function (event) {
event.stopPropagation();
});
});
Here is a demo: http://jsfiddle.net/KVXNL/
Docs for event.stopPropagation(): http://api.jquery.com/event.stopPropagation/

I made a plugin that does this. It preserves the value for this where as these other solutions' this value will refer to document.
https://github.com/tylercrompton/clickOut
Use:
$('#bbb').clickOut(function () {
$(this).hide();
});

You can use target property of the event object, try the following:
$(document).click(function(e) {
if (e.target.id != 'bbb') {
$('#bbb').hide();
}
})
DEMO

This will work
$("#aaa").click(function(){
$('#bbb').hide();
});
$("#bbb").click(function(event){
event.stopPropagation();
})​
Becouse bbb is inside the aaa the event will "bubbel up to aaa". So you have to stop the bubbling by using the event.stopPropagation when bbb is clicked
http://jsfiddle.net/GkRY2/5/

OK
* this is none jquery. you can easly modify it to work with IE
first create helper method to facilitate codding don't get confused with JQuery $()
function $g(element) {
return document.getElementById(element);
}
create our listener class
function globalClickEventListener(obj){
this.fire = function(event){
obj.onOutSideClick(event);
}
}
let's say we need to capture every click on document body
so we need to create listeners array and initialize our work. This method will be called on load
function initialize(){
// $g('body') will return reference to our document body. parameter 'body' is the id of our document body
$g('body').globalClickEventListeners = new Array();
$g('body').addGlobalClickEventListener = function (listener)
{
$g('body').globalClickEventListeners.push(listener);
}
// capture onclick event on document body and inform all listeners
$g('body').onclick = function(event) {
for(var i =0;i < $g('body').globalClickEventListeners.length; i++){
$g('body').globalClickEventListeners[i].fire(event);
}
}
}
after initialization we create event listener and pass reference of the object that needs to know every clcik on our document
function goListening(){
var icanSeeEveryClick = $g('myid');
var lsnr = new globalClickEventListener(icanSeeEveryClick);
// add our listener to listeners array
$g('body').addGlobalClickEventListener(lsnr);
// add event handling method to div
icanSeeEveryClick.onOutSideClick = function (event){
alert('Element with id : ' + event.target.id + ' has been clicked');
}
}
* Take into account the document body height and width
* Remove event listeners when you don't need them

$(document).click(function(event) {
if(!$(event.target).closest('#elementId').length) {
if($('#elementId').is(":visible")) {
$('#elementId').hide('fast');
}
}
})
Change the "#elementId" with your div.

How can I check on which element the event was triggered?

addLBEvent : function()
{
var amount = this.imageList.length;
for(var i = 0;i < amount;i++)
{
if(this.imageList[i].addEventListener)
{
this.imageList[i].addEventListener("click",this.startLB,false);
}
/*
IE<9-part
*/
}
},
startLB : function(src)
{
}
I'd like to know which element triggered the event.
If I'd do this in the HTML-Code I'd write something like onlick="startLB(this.src)" for example. How can I do such a thing with addEventListener?
I've already tried `addEventListener("click","myobjectname.startLB(this.src)" but it didn't work.
And sorry for my bad English

An event object is passed in as the first argument to any event handler.
The event object as a target property identifying the element to which the event applies.
addLBEvent : function(event) {
console.log(event.target);
}
https://developer.mozilla.org/en/DOM/event.target

You can access a reference to the element that triggered the event...
var elementThatTriggeredEvent = e.target || e.srcElement;
...assuming that e is the reference to the event.

If you want to know which element was clicked, use event.target.
If you want to know which element you had the handler on, use event.currentTarget or, in most cases, this. addEventListener will call your handler with this set to the element on which you called addEventListener.
Note the distinction. For instance, if you had this markup:
<div id="foo"><span id="bar">Hi there</span></div>
...and this code:
document.getElementById("foo").addEventListener('click', function(event) {
alert(this.id);
alert(event.target.id)
}, false);
...then if the user clicks the text "Hi there", this will be the div but event.target will be the span.
Live example | source
See how this is the element you hooked the event on, and event.target is the element on which it fired (and then it bubbled up to the div).
Note that addEventListener isn't available on older versions of IE; you have to use attachEvent instead. attachEvent doesn't ensure that this is set to the element on which you hooked it, so beware that difference between APIs. To smooth things like that out, you might look to any decent library, like jQuery, YUI, Closure, or any of several others.

Use this:
startLB : function(src)
{
var element = src.target.tagName;
alert("element >> "+element);
}

I think it's best for you to bind it like this:
var that = this;
this.imageList[i].addEventListener("click",function() {
that.startLB(this.src);
},false);
this will become the event target, so we have to access the object somehow, I named that that

try this...
addLBEvent : function(e)
{
if (!e) e = event;
e = e.srcElement || e.target;
.......
}

Prevent keydown() from being captured by document binding

I'm not exactly sure how to phrase this, so I couldn't search it. Basically, I have a keydown() bind on $(document). I'd like to show() another div, and have all keydown events be rerouted to this div and prevented from firing off in the document handler. Is this even possible, or would I have to put all my main keybindings on another div and work from there?

e.stopPropagation, or
e.preventDefault (depending on the situation)
Where e is the event.
Ex:
function onKeyDown(e) {
doStuff();
e.preventDefault();
}

e.preventDefault() will prevent the default behaviour of an event. What you need is to use
e.stopPropagation(), so that the event does not bubble up the DOM structure.
$(element).keydown(function(e) {
// do the task
// allow the default behaviour also
e.stopPropagation();
//^. BUT stop the even bubbling up right here
});
e.stopProgation(), can be bit confusing to grasp on the first but I created a demo with click event to explain it.
Hope it helps!!

Try:
​$(document).on('keydown', function (evt) {
$('#foo').show().trigger(evt);
});​​​​​
$('#foo').on('keydown', function (evt) {
console.log(evt);
return false; // this is very important. Without it, you'll get an endless loop.
});
​
demo: http://jsfiddle.net/Z7vYK/

The only way I can think of to even have a keydown event run on something other than an input or document, is to manually trigger it. You could have a global variable keep track of whether or not your div is showing, then trigger the event on your div accordingly.
Here's one such solution
HTML
Show div
<div id="hiddendiv"></div>​
Javascript
var showing = false;
function showdiv()
{
showing = true;
$('#hiddendiv').show(200);
}
// Set up events on page ready
$(function() {
$(document).keydown(function(e) {
// If the div is showing, trigger it's keydown
// event and return
if(showing)
{
$('#hiddendiv').data('keydown_event', e).keydown();
return true;
}
alert('Document keydown! Keycode: ' + e.keyCode);
// Otherwise do the normal keydown stuff...
});
// Keydown for the hidden div
$('#hiddendiv').keydown(function() {
e = $(this).data('keydown_event');
alert('Hiddendiv keydown! Keycode: ' + e.keyCode);
// Make sure to stop propagation, or the events
// will loop for ever
e.stopPropagation();
return false;
});
});
​
As you can see, the #hiddendiv keydown event is being triggered by the document keydown event. I've also included a slight hack to get the event object to the hidden div using the jQuery data function.
Here's a demonstration of the code: http://jsfiddle.net/Codemonkey/DZecX/1/