Develop Reference

How to stop event bubbling in jquery?

I'm using some JQ stuff on check box, even if the parent div is clicked. I am toggling the value of check box. Clicking on div is working perfectly but when you click on checkbox the function is called twice. Is there any way to solve this problem? following is my code(Fiddle)
HTML:
<div class="check-unit">
<input type="checkbox" class="check" />
<p class="brandList">Model</p>
</div>
JQ:
$('.check').on('change',function(e){
e.stopImmediatePropagation();
if($(this).is(':checked')){
console.log("checked");
}else{
console.log("unchecked");
}
});
$('.check-unit').on('click',function(e){
var checkbox = $(this).children('.check'),
chhhk= checkbox.attr('checked') ? false : true;
checkbox.attr('checked',chhhk);
$(this).children('.check').change();
});
I've seen eventbubbling problem on stackoverflow, but still confused how to do this. FIDDLE

Only execute the callback on the parent element if the target is not the input
$('.check').on('change',function(e){
if(this.checked){
console.log("checked");
}else{
console.log("unchecked");
}
});
$('.check-unit').on('click',function(e){
if ( ! $(e.target).hasClass('check')) {
$(this).children('.check').prop('checked', function(_,state) {
return !state;
}).trigger('change');
}
});
FIDDLE
As a sidenote, this is what label elements are for!

You need to use .prop() instead of .attr() to set the checked property.
$('.check').on('change', function (e) {
if (this.checked) {
console.log("checked");
} else {
console.log("unchecked");
}
}).click(function (e) {
//prevent clicks in the checksboxes from bubbling up otherwise when you click on the checkbox the state will get toggled again the event will be bubbled to check-unit which will again toggle the state negating the click
e.stopPropagation()
});
$('.check-unit').on('click', function () {
var checkbox = $(this).children('.check'),
//use .is() and checked-selector to check whether the checkbox is checked
chhhk = checkbox.is(':checked');
//use .prop() instead of .attr() & toggle the checked state
checkbox.prop('checked', !chhhk).change();
});
Demo: Fiddle

You can check if you are clicking the checkbox before changing.
$('.check-unit').on('click', function (e) {
if (!($(e.target).hasClass('check'))) {
var checkbox = $(this).children('.check'),
chhhk = checkbox.prop('checked');
checkbox.prop('checked', !chhhk).change();
}
});
Also note that the code is using prop instead of attr because when you are using boolean attribute values you should use .prop()
DEMO

jquery uncheck and check and vise versa checkbox of child element

Here is my html
#This will be generated throught loop
<li class="selector">
<a>
<input type="checkbox" value="test" /> test
</a>
</li>
Here is my jquery click event
$('.selector').on('click', function() {
if($(this).find('input').is(':checked')){
#uncheck the checkbox
}else{
#check the checkbox
}
});
How do I uncheck if checked and check if unchecked

Try
$(document).on('click', '.selector', function (e) {
if (!$(e.target).is('input')) {
$(this).find('input').prop('checked', function () {
return !this.checked;
});
}
});
Demo: Fiddle
Another way
$(document).on('click', '.selector', function (e) {
$(this).find('input').prop('checked', function () {
return !this.checked;
});
});
$(document).on('click', '.selector input', function (e) {
e.stopPropagation();
});
Demo: Fiddle

Try this
$('.selector').on('click', function() {
var checkbox = $(this).find(':checkbox');
if($(checkbox).is(':checked')){
$(checkbox).prop('checked', false);
}else{
#check the checkbox
$(checkbox).prop('checked', true);
}
});

I don't understand why you are trying to do this with JavaScript. If the user clicks directly on the checkbox it will automatically check/uncheck itself, but if you add code to check/uncheck it in JS that would cancel out the default behaviour so in your click handler you'd need to test that the click was elsewhere within the .selector.
Anwyay, the .prop() method has you covered:
$('.selector').on('click', function(e) {
if (e.target.type === "checkbox") return; // do nothing if checkbox clicked directly
$(this).find("input[type=checkbox]").prop("checked", function(i,v) {
return !v; // set to opposite of current value
});
});
Demo: http://jsfiddle.net/N4crP/1/
However, if your goal is just to allow clicking on the text "test" to click the box you don't need JavaScript because that's what a <label> element does:
<li class="selector">
<label>
<input type="checkbox" value="test" /> test
</label>
</li>
As you can see in this demo: http://jsfiddle.net/N4crP/2/ - clicking on the text "test" or the checkbox will toggle the current value without any JavaScript.

jquery stopPropogation() not working as expected

here is my html :
<span class="checkbox checked replacement" tabindex="0">
<span class="check-knob"></span>
<input type="checkbox" name="data[InfoPagesClient][3][info_page_id]" value="25" checked="checked" class="">
</span>
<label for="InfoPagesClient3InfoPageId" class="label">asdasd</label>
now I want to show hide this pencil box on checkbox click event..
javascript :
$("p.checkbox-group span.checkbox").on('click', function(){
if($(this).hasClass('checked')) {
$(imgId).hide();
} else {
console.log('aaaaaaaaaaa');
$(imgId).show();
}
});
$("label.label").on('click', function(e) {
if ($(this).siblings('span.checkbox').hasClass('checked')) {
$(imgId).hide();
} else {
$(imgId).show();
}
e.stopImmediatePropagation();
});
clikcing on label it is going to span click event and prints console value... I tried using e.stopPropogation() and stopImmediatePropogation().. but ti is not working..
any idea ??

e.stopPropogation() or e.stopImmediatePropogation() will prevent the event from bubbling up, but will not stop the event immediately.
You can use e.preventDefault() along with e.stopPropogation(). e.preventDefault() will prevent the default event from occurring. You can check with the following change in your code.
$("p.checkbox-group span.checkbox").on('click', function(e){
e.preventDefault();
e.stopPropagation();
if($(this).hasClass('checked')) {
$(imgId).hide();
} else {
console.log('aaaaaaaaaaa');
$(imgId).show();
}
});
$("label.label").on('click', function(e) {
e.preventDefault();
e.stopPropagation();
if ($(this).siblings('span.checkbox').hasClass('checked')) {
$(imgId).hide();
} else {
$(imgId).show();
}
});

When you use label with for, browser will automatically click the associated control which triggers the "click" event. That is another event triggered later, in your case when you use e.stopImmediatePropagation();, it just stops the current "click" event and has no effect on the event of the associated control fired after that
To fix your issue, try removing for
Use this:
<label class="label">asdasd</label>
Instead of:
<label for="InfoPagesClient3InfoPageId" class="label">asdasd</label>

If you add the id attribute to your checkbox, then the label will work. Then you can simplify your code as follows:
$(function () {
$("p.checkbox-group input[type=checkbox]").on('change', function () {
if (this.checked) {
$(this).parent().addClass('checked').siblings('a.edit-content').hide();
} else {
$(this).parent().removeClass('checked').siblings('a.edit-content').show();
}
});
});
http://jsfiddle.net/gFXcm/2/

mmmh, isn't it a feature instead of a bug ? shouldn't the click on the label trigger the same action as the click on the "checkbox" ? That's precisely why the for attribute is used I guess.

How do you propagate a click to child elements if the parent element has preventDefault?

UPDATE:
this doesn't work in the latest version of firefox (15.0.1):
http://jsfiddle.net/DerNalia/NdrNV/5/
clicking the checkbox navigates to google... but it shouldn't :(
it appears that adding e.stopPropagation() doesn't help / doesn't work.
playarea: http://jsfiddle.net/DerNalia/NdrNV/1/
What I'm trying to do:
When I click the checkbox that is next to (but actually is a child element of) the anchor, it should change states, and also change the state of the "other" checkbox.
But because the anchor has e.preventDefault() invoked, the checkbox never gets checked.
Here is my markup
Link Name <input class="home" type="checkbox"/>
<br />
Sync'd checkbox: <input class="other" type="checkbox" />​
Here is some the troubled jquery
$(function() {
$("input.home").click(function() {
$("input.other").click();
});
$("a").click(function(e) {
e.preventDefault();
// prevent default so we can do some ajaxy things instead of follow the href
});
})​
So, how do I change the jQuery click action on the anchor tag such that clicks propagate to child elements (but I can still do ajaxy things without the browser following the href of the anchor tag)?
Is there a way to do this without changing the markup? (the way it is now makes semantic sense for my web application)

It doesn't work because event.preventDefault would cancel the event.
Using e.preventDefault on click on the checkbox which is wrapped inside <a> would not let you change the checkbox state.
A workaround I could think of is to set the checkbox state in a different context so that the e.preventDefault code is ineffective.
DEMO: http://jsfiddle.net/NdrNV/10/
$(function() {
$("input.home").click(function() {
$("input.other").click();
});
$("a").click(function(e) {
e.preventDefault();
var setCheckbox = function() {
var checkbox = $(e.target)[0];
checkbox.checked = checkbox.checked?false:true;
}
if ($(e.target).is(':checkbox')) {
setTimeout(setCheckbox, 0);
}
});
})
Note: This is a workaround.

You can put condition e.target.tagName like this,
if(e.target.tagName == 'A')
e.preventDefault();
Live Demo
$(function() {
$("input.home").click(function() {
$("input.other").click();
});
$("a").click(function(e) {
if(e.target.tagName == 'A')
e.preventDefault();
// prevent default so we can do some ajaxy things instead of follow the href
});
})​

$(function() {
$("input.home").click(function() {
if($(this).attr('checked') == 'checked')
$(this).removeAttr('checked');
else
$(this).attr('checked', 'checked');
$("input.other").click();
});
$("a").click(function(e) {
e.preventDefault();
// prevent default so we can do some ajaxy things instead of follow the href
var target = e.target; // object that triggers the event
$(target).children().trigger('click');
});
});

Javascript/ JQuery Deselecting radio buttons

I have the following javascript, which I want to use to enable the user to deselect a selected radio button by clicking it. (I know this is not standard, but it is required by the system :)
DeselectRadioButton = {
setup: function () {
$(".deselectRadioButton").click(function () {
if ($(this).is(':checked')) {
alert("I am checked!");
($(this).removeAttr('checked'));
}
});
}
};
My issue is that when I select an unselected radio button, it immediately deselects it after the alert shows.
I guess I am receiving the event after the item has changed - how can I fix this code to make my radio button deselectable?
Thanks!

However, the main issue is that when I
select an unselected radio button, it
immediately deselects it after the
alert shows.
It seems you can't prevent the default behavior of a radio button with either return false or e.preventDefault() as the radio button always is checked when the click handler is fired. One way around this was to add a separate class to the radio button and use that as your indicator.
$(".deselectRadioButton").click( function(e){
if($(this).hasClass("on")){
$(this).removeAttr('checked');
}
$(this).toggleClass("on");
}).filter(":checked").addClass("on");
Code example on jsfiddle.

One of the challenges I found while doing this was with groups of radio buttons. The solutions provided work splendidly for a single radio button, but in groups I ran into an issue where de-selecting one and then trying to select another failed (until a second click).
I just came across a solution here that's working splendidly:
var allRadios = $('input[type=radio]')
var radioChecked;
var setCurrent = function(e) {
var obj = e.target;
radioChecked = $(obj).attr('checked');
}
var setCheck = function(e) {
if (e.type == 'keypress' && e.charCode != 32) {
return false;
}
var obj = e.target;
if (radioChecked) {
$(obj).attr('checked', false);
} else {
$(obj).attr('checked', true);
}
}
$.each(allRadios, function(i, val){
var label = $('label[for=' + $(this).attr("id") + ']');
$(this).bind('mousedown keydown', function(e){
setCurrent(e);
});
label.bind('mousedown keydown', function(e){
e.target = $('#' + $(this).attr("for"));
setCurrent(e);
});
$(this).bind('click', function(e){
setCheck(e);
});
});

try:
$(this).removeAttr('checked');

I experienced the same problem David described with groups of radio buttons. Here's another way around that problem (based on Mark's solution) that works for multiple radio button groups on the same page:
$(":radio").click( function(e){
var itsOn = $(this).hasClass("on");
$(":radio[name="+ this.name + "]").removeClass("on");
if(itsOn){
$(this).removeAttr('checked');
$(this).siblings().filter("[value='']").attr('checked', true);
} else {
$(this).addClass("on");
}
}).filter(":checked").addClass("on");

Are you sure there's nothing else messing with it?
I tried this code, and it works:
HTML
<ul>
<li>
<input id="one" name="value" type="radio">
<label for="one">One</label>
</li>
<li>
<input id="two" name="value" type="radio">
<label for="two">Two</label>
</li>
<li>
<input id="three" name="value" type="radio">
<label for="three">Three</label>
</li>
</ul>
JavaScript
$("input[type='radio']").click(function(event) {
// If the button is selected.
if ($(this).hasClass("checked")) {
// Remove the placeholder.
$(this).removeClass("checked");
// And remove the selection.
$(this).removeAttr("checked");
// If the button is not selected.
} else {
// Remove the placeholder from the other buttons.
$("input[type='radio']").each(function () {
$(this).removeClass("checked");
});
// And add the placeholder to the button.
$(this).addClass("checked");
}
});
You can test it here.