What I am trying to do is to test when an element (a SELECT) loses its focus if the focus has been transfered to another specific element (another SELECT). I want to trigger something when the focus is lost and is not on one of the two.
The problem is I test in the first select when it has lost the focus (with the blur event) if the other select has it, but the DOM is not yet updated.
Here's an exemple of what I did:
$select1.on("blur", function() {
if($select2.is(":focus"))
{
// do something
}
else
{
// do something else
}
});
$select1 and $select2 are just two variables that contain the element. I read that JQuery adds an identifier ":focus" when an element gains the focus, but the way I did it, it doesn't work.
In all cases, it goes into the else "do something else".
Matt is right about the order of events but you can be a little more creative.
For example use a setTimeout to delay the check for blur so you know you already fired your focus. Simple.
$select1.on("blur", function() {
window.setTimeout(function() {
if($select2.is(":focus"))
{
// do something
}
else
{
// do something else
}
},100);
});
Try that one.
Because the blur event is distinctly fired before the focus of the new element is, the only thing you can do is set a variable in one event and detect it in the other.
$select1.on('blur', function (e) {
var $that = $(this);
setTimeout(function () {
if (($that.data('focussed') || 0) > e.timeStamp - 5) {
// Do something
} else {
// Something else
}
}, 1);
});
$select2.on('focus', function (e) {
$select1.data('focussed', e.timeStamp);
});
See it working here; http://jsfiddle.net/uZAMm/
Related
When user clicks on input field, two consecutive events are being executed: focus and click.
focus always gets executed first and shows the notice. But click which runs immediately after focus hides the notice. I only have this problem when input field is not focused and both events get executed consecutively.
I'm looking for the clean solution which can help me to implement such functionality (without any timeouts or weird hacks).
HTML:
<label for="example">Example input: </label>
<input type="text" id="example" name="example" />
<p id="notice" class="hide">This text could show when focus, hide when blur and toggle show/hide when click.</p>
JavaScript:
$('#example').on('focus', _onFocus)
.on('blur', _onBlur)
.on('click', _onClick);
function _onFocus(e) {
console.log('focus');
e.preventDefault();
e.stopPropagation();
e.stopImmediatePropagation();
$('#notice').removeClass('hide');
}
function _onClick(e) {
console.log('click');
$('#notice').toggleClass('hide');
}
function _onBlur(e) {
console.log('blur');
$('#notice').addClass('hide');
}
UPDATED Fiddle is here:
I think you jumbled up the toggles. No need to prevent propagation and all that. Just check if the notice is already visible when click fires.
Demo: http://jsfiddle.net/3Bev4/13/
Code:
var $notice = $('#notice'); // cache the notice
function _onFocus(e) {
console.log('focus');
$notice.removeClass('hide'); // on focus show it
}
function _onClick(e) {
console.log('click');
if ($notice.is('hidden')) { // on click check if already visible
$notice.removeClass('hide'); // if not then show it
}
}
function _onBlur(e) {
console.log('blur');
$notice.addClass('hide'); // on blur hide it
}
Hope that helps.
Update: based on OP's clarification on click toggling:
Just cache the focus event in a state variable and then based on the state either show the notice or toggle the class.
Demo 2: http://jsfiddle.net/3Bev4/19/
Updated code:
var $notice = $('#notice'), isfocus = false;
function _onFocus(e) {
isFocus = true; // cache the state of focus
$notice.removeClass('hide');
}
function _onClick(e) {
if (isFocus) { // if focus was fired, show/hide based on visibility
if ($notice.is('hidden')) { $notice.removeClass('hide'); }
isFocus = false; // reset the cached state for future
} else {
$notice.toggleClass('hide'); // toggle if there is only click while focussed
}
}
Update 2: based on OP's observation on first click after tab focus:
On second thought, can you just bind the mousedown or mouseup instead of click? That will not fire the focus.
Demo 3: http://jsfiddle.net/3Bev4/24/
Updated code:
$('#example').on('focus', _onFocus)
.on('blur', _onBlur)
.on('mousedown', _onClick);
var $notice = $('#notice');
function _onFocus(e) { $notice.removeClass('hide'); }
function _onClick(e) { $notice.toggleClass('hide'); }
function _onBlur(e) { $notice.addClass('hide'); }
Does that work for you?
Setting a variable for "focus" seems to do the trick : http://jsfiddle.net/3Bev4/9/
Javascript:
$('#example').on('focus', _onFocus)
.on('click', _onClick)
.on('blur', _onBlur);
focus = false;
function _onFocus(e) {
console.log('focus');
$('#notice').removeClass('hide');
e.preventDefault();
e.stopPropagation();
e.stopImmediatePropagation();
focus = true;
}
function _onClick(e) {
console.log('click');
if (!focus) {
$('#notice').toggleClass('hide');
} else {
focus = false;
}
}
function _onBlur(e) {
console.log('blur');
$('#notice').addClass('hide');
}
If you want to hide the notice onBlur, surely it needs to be:
function _onBlur(e) {
console.log('blur');
$('#notice').addClass('hide'); // Add the hidden class, not remove it
}
When doing this in the fiddle, it seemed to fix it.
The code you have written is correct, except that you have to replae $('#notice').removeClass('hide'); with $('#notice').addClass('hide');
Because onBlur you want to hide so add hide class, instead you are removing the "hide" calss.
I hope this is what the mistake you have done.
Correct if I am wrong, Because I don't know JQuery much, I just know JavaScript.
you can use many jQuery methods rather than add or move class:
Update: add a params to deal with the click function
http://jsfiddle.net/3Bev4/23/
var showNotice = false;
$('#example').focus(function(){
$('#notice').show();
showNotice = true;
}).click(function(){
if(showNotice){
$('#notice').show();
showNotice = false;
}else{
showNotice = true;
$('#notice').hide();
}
}).blur(function(){
$('#notice').hide();
});
To expound upon the question:
I've got an element which when clicked receives a sub-element. That sub-element is given a blur handler.
What I would like is for that handler not to be invoked when the browser loses focus (on window blur).
Towards that goal I've attempted several tacks, this being my current effort:
function clicked() {
// generate a child element
...
field = $(this).children(":first");
$(window).blur(function () {
field.unbind("blur");
});
$(window).focus(function () {
field.focus();
field.blur(function () {
save(this);
});
});
field.blur(function () {
save(this);
});
}
This doesn't work. What appears to be occurring is that when the browser loses focus, the field is losing focus first.
Nice question!
This is possible, and fairly straightforward.
field.blur(function() {
if(document.activeElement !== this) {
// this is a blur that isn't a window blur
}
});
JSFiddle
Or in vanilla JS:
field.addEventListener('blur', function() {
if(document.activeElement !== this) {
// this is a blur that isn't a window blur
}
});
Edit: Though your answer deals with the browser losing focus, know that Firefox has unusal behavior (bug?) when returning to focus. If you have a input focused, and then unfocus the window, the element's blur is triggered (which is what the question was about). If you return to something other than the input, the blur event is fired a second time.
A mildly dirty way to do this could be to use a setTimeout() prior to taking action.
var windowFocus;
$(window).focus(function() {
windowFocus = true;
});
$(window).blur(function() {
windowFocus = false;
});
function clicked() {
// generate a child element
...
field = $(this).children(":first");
field.blur(function () {
setTimeout(function() {
if (windowFocus) {
save(this);
}
}, 50);
});
}
I am looking for a way to manage the events. I have a hover function for element A, and click function for element B. I want to disable A`s hover function temporary while the second click of B.
I am looking for a way that not necessary to rewrite the hole function of A inside of B. Something very simply just like "Store and Disable Event, Call Stored Function"
I found some technique like .data('events') and console.log. I tired but failed, or maybe I wrote them in a wrong way.
Please help and advice!
$(A).hover();
$(b).click(
if($.hasData($(A)[0])){ // if A has event,
//STORE all the event A has, and disable
}else{
//ENABLE the stored event for A
}
);
Try this
var hoverme = function() {
alert('Hover Event Fired');
};
$('.A').hover(hoverme);
var i = 0;
$('.B').on('click', function(){
if(i%2 === 0){
// Unbind event
$('.A').off('hover');
}
else{
// Else bind the event
$('.A').hover(hoverme);
}
i++;
});
Check Fiddle
I think that what you want to do is something like this (example for JQuery 1.7.2):
$("#a").hover(function(){alert("test")});
$("#a")[0].active=true;
$("#b").click(function(){
if($("#a")[0].active){
$("#a")[0].storedEvents = [];
var hoverEvents = $("#a").data("events").mouseover;
jQuery.each(hoverEvents , function(key,handlerObj) {
$("#a")[0].storedEvents.push(handlerObj.handler);
});
$("#a").off('hover');
}else{
for(var i=0;i<$("#a")[0].storedEvents.length;i++){
$("#a").hover($("#a")[0].storedEvents[i]);
}
}
$("#a")[0].active = ($("#a")[0].active)==false;
});
JSFiddle Example
But there are a couple of things that you must have in consideration:
This will only work if you add the events with JQuery, because JQuery keeps an internal track of the event handlers that have been added.
Each version of JQuery handles data("events") differently, that means that this code may not work with other version of JQuery.
I hope that this helps.
EDIT:
data("events") was an internal undocumented data structure used in JQuery 1.6 and JQUery 1.7, but it has been removed in JQuery 1.8. So in JQuery 1.8 the only way to access the events data is through: $._data(element, "events"). But keep in mind the advice from the JQuery documentation: this is not a supported public interface; the actual data structures may change incompatibly from version to version.
You could try having a variable that is outside the scope of functions a and b, and use that variable to trigger the action to take in function b on function a.
var state;
var a = function() {
if(!state) {
state = true;
// Add hover action and other prep. I'd create a third function to handle this.
console.log(state);
};
var b = function() {
if(state) {
state = false;
// Do unbinding of hover code with third function.
} else {
state = true;
// Do whatever else you needed to do
}
}
Without knowing more about what you're trying to do, I'd try something similar to this.
It sounds like you want to disable the click hover event for A if B is clicked.
$("body").on("hover", "#a", function(){
alert("hovering");
});
$("#b").click( function(){
$("body").off("hover", "#a", function() {
alert("removed hovering");
});
});
You can use the jQuery off method, have a look at this fiddle. http://jsfiddle.net/nKLwK/1/
Define a function to assign to hover on A element, so in b click, call unbind('hover') for A element and in second click on b element define again a function to hover, like this:
function aHover(eventObject) {
// Todo when the mouse enter object. You can use $(this) here
}
function aHoverOut(eventObject) {
// Todo when the mouse leave the object. You can use $(this) here
}
$(A).hover(aHover, aHoverOut);
// ...
$(b).click(function(eventObject) {
if($.hasData($(A)[0])){ // if A has event,
$(A).unbind('mouseenter mouseleave'); // This is because not a event hover, jQuery convert the element.hover(hoverIn, hoverOut) in element.bind('mouseenter', hoverIn) and element.bind('mouseleave', hoverOut)
}else{
$(A).hover(aHover, aHoverOut);
}
});
There are provably better ways to do it, but this works fine, on document ready do this:
$("#a")[0].active=false;
$("#b").click(function(){
$("#a")[0].active = ($("#a")[0].active)==false;
if($("#a")[0].active){
$("#a").hover(function(){alert("test")});
}else{
$("#a").off('hover');
}
});
JSFiddle example
You can use .off function from jQuery to unbind the hover on your "a" element.
function hoverA() {
alert('I\'m on hover');
}
$('#a').hover( hoverA );
var active = true;
$('#b').on('click', function(){
if(active){
$('#a').off('hover');
active = false;
} else{
$('#a').hover(hoverA);
active = true;
}
});
Live demo available here : http://codepen.io/joe/pen/wblpC
I need to get the newly focussed element (if any) while executing an onBlur handler.
How can I do this?
I can think of some awful solutions, but nothing which doesn't involve setTimeout.
Reference it with:
document.activeElement
Unfortunately the new element isn't focused as the blur event happens, so this will report body. So you are gonna have to hack it with flags and focus event, or use setTimeout.
$("input").blur(function() {
setTimeout(function() {
console.log(document.activeElement);
}, 1);
});
Works fine.
Without setTimeout, you can use this:
http://jsfiddle.net/RKtdm/
(function() {
var blurred = false,
testIs = $([document.body, document, document.documentElement]);
//Don't customize this, especially "focusIN" should NOT be changed to "focus"
$(document).on("focusin", function() {
if (blurred) {
var elem = document.activeElement;
blurred = false;
if (!$(elem).is(testIs)) {
doSomethingWith(elem); //If we reached here, then we have what you need.
}
}
});
//This is customizable to an extent, set your selectors up here and set blurred = true in the function
$("input").blur(function() {
blurred = true;
});
})();
//Your custom handler
function doSomethingWith(elem) {
console.log(elem);
}
Why not using focusout event? https://developer.mozilla.org/en-US/docs/Web/Events/focusout
relatedTarget property will give you the element that is receiving the focus.
I have a small jQuery script:
$('.field').blur(function() {
$(this).next().children().hide();
});
The children that is hidden contains some links. This makes it impossible to click the links (because they get hidden). What is an appropriate solution to this?
This is as close as I have got:
$('.field').blur(function() {
$('*').not('.adress').click(function(e) {
foo = $(this).data('events').click;
if(foo.length <= 1) {
// $(this).next('.spacer').children().removeClass("visible");
}
$(this).unbind(e);
});
});
The uncommented line is suppose to refer to the field that is blurred, but it doesn't seem to work. Any suggestions?
You can give it a slight delay, like this:
$('.field').blur(function() {
var kids = $(this).next().children();
setTimeout(function() { kids.hide(); }, 10);
});
This gives you time to click before those child links go away.
This is how I ended up doing it:
var curFocus;
$(document).delegate('*','mousedown', function(){
if ((this != curFocus) && // don't bother if this was the previous active element
($(curFocus).is('.field')) && // if it was a .field that was blurred
!($(this).is('.adress'))
) {
$('.' + $(curFocus).attr("id")).removeClass("visible"); // take action based on the blurred element
}
curFocus = this; // log the newly focussed element for the next event
});
I believe you can use .not('a') in this situation:
$('.field').not('a').blur(function() {
$(this).next().children().hide();
});
This isn't tested, so I am not sure if this will work or not.