I added to my handler the function you shared, and it looks like this:
initMouseHandling:function(){
var dragged = null,
_mouseP,
selected,
nearest = null,
show = true,
num_console = 0,
timeout,
clicks,
delay = 500;
var handler = {
single_double_click: function (element, clicked, double_click, timeout) {
$(element).observe('click', function (event) {
++clicks;
if (clicks === 1) {
var timeoutCallback = function (event) {
if (clicks === 1) {
clicked.call(this, event);
} else {
double_click.call(this, event);
}
clicks = 0;
};
timeoutCallback.bind(this, event).delay(timeout / 1000);
}
}.bind(this));
return false;
},
clicked:function(e){
...
},
dragged:function(e){
...
},
dropped:function(e){
...
},
over_edge:function(e){
...
},
over_node:function(e){
...
},
double_click:function(e){
...
}}
canvas.mousemove(handler.over_node);
canvas.mousemove(handler.over_edge);
canvas.mousedown(handler.single_double_click);
//canvas.mousedown(handler.clicked);
//canvas.dblclick(handler.double_click);
}
It says:
"Uncaught TypeError: Object [object Object] has no method 'observe'"
Regardless of using $(canvas) or $(window) as I've seen in other places...
I don't know if I should introduce the handlers as parameters or not, why I cannot use "observe" and if for a case like mine I should call my handlers like that:
clicked.call(this, event);
double_click.call(this, event);
Any suggestions?
Have you looked into jQuery's dblclick?
There is no jquery function observe and the error tells you that.
To detect double clicks you start a timeout on the first click,
cancel it if clicked in timeout duration (200ms) and trigger single click or trigger double click on next click:
let timeout;
$("button").on("click", () => {
if (timeout) {
clearTimeout(timeout);
timeout = null;
alert("double click")
return;
}
timeout = setTimeout(() => {
alert("single click");
timeout = null;
}, 200); // 200ms, try other values for best ux
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button>Click me</button>
Related
I created a site that will change images from being displayed on mouse scroll. It was working until this morning on my local machine, but suddenly stopped. When I check the dev console I get an error message that says "[Intervention] Unable to preventDefault inside passive event listener due to target being treated as passive. See https://www.chromestatus.com/features/6662647093133312"
I have read the information at the provided url and I still do not understand how I can turn off this feature. In my code I have the following:
var changeImage = function changeImage(event) {
event.preventDefault();
if (brochure.waitForDelay === false) {
window.onwheel = function () {
return false;
};
brochure.waitForDelay = true;
if (event.deltaY < 0) {
scrollUp();
} else {
scrollDown();
}
setTimeout(function () {
brochure.waitForDelay = false;
window.onwheel = function () {
return true;
};
}, 1250);
} else {
return;
}
};
var determineScrollDirection = function determineScrollDirection() {
document.addEventListener('wheel', changeImage, { passive: false });
};
In determineScrollDirection I set the passive as false and tried to call preventDefault in the changeImage function but I still get the same error message.
I was able to fix this issue by removing the following line:
window.onwheel = function () {
return false;
};
I am playing around with a short little code to see if I can get a function going while the user has their mouse down and then end it when they bring their mouse up. For this example I am trying to increment a number that I am displaying on the screen as the user moves their mouse while holding the button down. I want it to freeze and stop once they release the button, however the counter just resets and the count continues from 0 even though the button is not being pressed...
function dragInit(state, e) {
var i = 0;
$(document).on("mousemove", function() {
if (state) {
i+=1;
$('#debug').text(i); //Show the value in a div
}
});
}
$(document).ready(function() {
$(document).on(
{mousedown: function(e) {
var state = true;
dragInit(e, state);
},
mouseup: function(e) {
var state = false;
dragInit(e, state);
}
});
});
As an aside, is there a way I can display whether a variable is true or false onscreen? When I try it just says [object Object].
There are a lot of mistakes in your code. I suggest you to read more basic concepts before starting to use jQuery.
The order of the parameters passed to dragInit() is wrong on both mouseup and mousedown event bindings.
The reason your counter is restarting is because your variable i is local, so it exists only during the function context it is declared in.
You are making the same mistake with the state variable, but in this case it is completely unnecessary to declare it.
Consider making your counter a global (even though it is not a good practice).
I can't provide you code because I am answering from my phone. A solution would be create a mousemove event that checkes whether the mouse button is pressed before incrementing your counter.
Hope I helped
You could do something like this:
function dragInit() {
$(document).on("mousemove", function () {
if (eventState.state) {
eventState.count += 1;
$('#debug').text(eventState.count); //Show the value in a div
}
});
}
// Create an object to track event variables
var eventState = {
count:0, //replaces your previous 'i' variable
state: false //keeps track of mouseup or mousedown
};
$(document).ready(function () {
$(document).on({
mousedown: function (e) {
eventState.state = true;
dragInit(); //don't need to pass anything anymore
},
mouseup: function (e) {
eventState.state = false;
dragInit(); //don't need to pass anything anymore
}
});
});
jsFiddle
Or keep everything together as one object
var dragInit = function () {
var count = 0;
var state = false;
var action = function () {
$(document).on("mousemove", function () {
if (state) {
count += 1;
$('#debug').text(count); //Show the value in a div
}
})
};
$(document).on({
mousedown: function (e) {
state = true;
action(); //don't need to pass anything anymore
},
mouseup: function (e) {
state = false;
action(); //don't need to pass anything anymore
}
});
}
$(document).ready(function () {
var obj = new dragInit();
});
jsFiddle 2
Example in response to comment
jsFiddle: This shows why the following code snippets differ in execution.
// Works
$(document).on("mousemove", function () {
if (state) {
}
})
// Doesn't
if (state) {
$(document).on("mousemove", function () {
});
}
Less code, You just need this.
Use jquery on and Off to turn on and off mousemove event.
Counter Reset http://jsfiddle.net/kRtEk/
$(document).ready(function () {
var i = 0;
$(document).on({
mousedown: function (e) {
$(document).on("mousemove", function () {
$('#debug').text(i++); //Show the value in a div
});
},
mouseup: function (e) {
i = 0;
$('#debug').text(i);
$(document).off("mousemove");
}
});
});
W/O Reset http://jsfiddle.net/gumwj/
$(document).ready(function () {
var i = 0;
$(document).on({
mousedown: function (e) {
$(document).on("mousemove", function () {
$('#debug').text(i++); //Show the value in a div
});
},
mouseup: function (e) {
$(document).off("mousemove");
}
});
});
WithNoCounter http://jsfiddle.net/F3ESx/
$(document).ready(function () {
$(document).on({
mousedown: function (e) {
$(document).on("mousemove", function () {
$('#debug').data('idx',parseInt($('#debug').data('idx')|0)+1).text($('#debug').data('idx')); //Show the value in a div
});
},
mouseup: function (e) {
$(document).off("mousemove");
}
});
});
Assuming you are married to Jquery (nothing wrong with that) - check out and consider entirely re-thinking your approach leveraging the ".one()" (http://api.jquery.com/one/) method.
edit: and if that taste doesn't sit well - familiarize yourself with the "deferred" object (http://api.jquery.com/category/deferred-object/)
lots of ways to approach this via jquery - what you decide in the end depends on what you really intend to do with this.
If i want to bind an event on page scrolling i can use scroll();.
But how to fire when scroll() is ended up?
I would like to reproduce this:
$(window).scroll(function(){
//do somenthing
});
$(window).scrollSTOPPED(function(){ //--> when i'm scrolling then i stop to scrolling (so NOT when page scrollbar is at the end top or bottom :)
//do somenthing else
});
any ideas?
tiny jquery way
$.fn.scrollStopped = function(callback) {
var that = this, $this = $(that);
$this.scroll(function(ev) {
clearTimeout($this.data('scrollTimeout'));
$this.data('scrollTimeout', setTimeout(callback.bind(that), 250, ev));
});
};
After 250 ms from the last scroll event, this will invoke the "scrollStopped" callback.
http://jsfiddle.net/wtRrV/256/
lodash (even smaller)
function onScrollStopped(domElement, callback) {
domElement.addEventListener('scroll', _.debounce(callback, 250));
}
http://jsfiddle.net/hotw1o2j/
pure js (technically the smallest)
function onScrollStopped(domElement, callback, timeout = 250) {
domElement.addEventListener('scroll', () => {
clearTimeout(callback.timeout);
callback.timeout = setTimeout(callback, timeout);
});
}
https://jsfiddle.net/kpsxdcv8/15/
strange fact
clearTimeout and clearInterval params don't have to be defined and can even be wrong types or even omitted.
http://jsfiddle.net/2w5zLwvx/
the event itself doesn't exist as scroll is a single event fired everytime the user scrolls by a certain increment.
What you can do however is emulate the event.
Credit to James Padolsey for this, lifted from his webpage:.
Read it here to fully understand the code and how it is implemented.
http://james.padolsey.com/javascript/special-scroll-events-for-jquery/
(function(){
var special = jQuery.event.special,
uid1 = 'D' + (+new Date()),
uid2 = 'D' + (+new Date() + 1);
special.scrollstart = {
setup: function() {
var timer,
handler = function(evt) {
var _self = this,
_args = arguments;
if (timer) {
clearTimeout(timer);
} else {
evt.type = 'scrollstart';
jQuery.event.handle.apply(_self, _args);
}
timer = setTimeout( function(){
timer = null;
}, special.scrollstop.latency);
};
jQuery(this).bind('scroll', handler).data(uid1, handler);
},
teardown: function(){
jQuery(this).unbind( 'scroll', jQuery(this).data(uid1) );
}
};
special.scrollstop = {
latency: 300,
setup: function() {
var timer,
handler = function(evt) {
var _self = this,
_args = arguments;
if (timer) {
clearTimeout(timer);
}
timer = setTimeout( function(){
timer = null;
evt.type = 'scrollstop';
jQuery.event.handle.apply(_self, _args);
}, special.scrollstop.latency);
};
jQuery(this).bind('scroll', handler).data(uid2, handler);
},
teardown: function() {
jQuery(this).unbind( 'scroll', jQuery(this).data(uid2) );
}
}; })();
Probably worth noting that there are several questions related to yours, so this may be a possible duplication.
e.g.
Javascript: do an action after user is done scrolling
and Fire event after scrollling scrollbars or mousewheel with javascript
You can verify if window.scrollY == 0
$(window).scroll(function(){
if (window.scrollY == 0) {
//...
}
});
But this event will be fired at every scroll.
I prefer to be able to listen on a event. This is what I do:
The jquery plugin:
+function(jQuery){
var scrollStopEventEmitter = function(element, jQuery) {
this.scrollTimeOut = false;
this.element = element;
jQuery(element).on('scroll', $.proxy(this.onScroll, this));
}
scrollStopEventEmitter.prototype.onScroll = function()
{
if (this.scrollTimeOut != false) {
clearTimeout(this.scrollTimeOut);
}
var context = this;
this.scrollTimeOut = setTimeout(function(){ context.onScrollStop()}, 250);
}
scrollStopEventEmitter.prototype.onScrollStop = function()
{
this.element.trigger('scrollStop');
}
jQuery.fn.scrollStopEventEmitter = function(jQuery) {
return new scrollStopEventEmitter(this, jQuery);
};
}($);
In this case, window will now trigger scrollStop event
$(window).scrollStopEventEmitter($);
Now I can listen on scrollStop
$(window).on('scrollStop',function(){
// code
What I am trying to do is make a function that calls another function continuously as long as the mouse button is being held. I am doing this just so I can get a better understanding of .call() and callbacks. Here is my code:
jQuery.fn.contmousedown = function(mousedownCallback){
var interval, self = this;
jQuery(this).mousedown(function(event){
interval = setInterval(function(self, event){
mousedownCallback.call(self, event);
console.log('on');
},0);
});
jQuery(this).mouseup(function(event){
clearInterval(interval);
});
}
$(document).contmousedown(function(e){
$('#run').html(e.pageX+', '+e.pageY);
});
And the error I receive is:
Uncaught TypeError: Cannot read property 'pageX' of undefined
And of course I am receiving that about 300x a second. :) If i change my interval declaration line to interval = setInterval(function(self){ then I get 'on' logged to my console at about 300x a second but I lose the event. So my question is how can I make it so I can callback the function and pass it the event parameter?
Example - http://jsfiddle.net/ZxKxD/
Thinking about this on my commute home, I decided that it would be nice to keep both events. So here is my final code:
jQuery.fn.mousehold = function(mousedownCallback){
var interval, self = this, move_event;
jQuery(this).mousemove(function(e){
move_event = e;
});
jQuery(this).mousedown(function(click_event){
interval = setInterval(function(){
mousedownCallback.call(self, click_event, move_event);
},0);
});
jQuery(this).mouseup(function(){
clearInterval(interval);
});
jQuery(this).mouseout(function(){
clearInterval(interval);
});
}
$(document).mousehold(function(click_event, move_event){
$('#run').html(click_event.pageX+':'+move_event.pageX+', '
+click_event.pageY+':'+move_event.pageY);
});
setInterval does not pass arguments to the callback, so remove the self and event arguments. You don't "lose" the event in doing so.
$.fn.contmousedown = function(mousedownCallback)
{
var interval,
self = this;
$(this).mousedown(function(event)
{
interval = setInterval(function()
{
mousedownCallback.call(self, event);
console.log('on');
}, 0);
});
$(this).mouseup(function()
{
clearInterval(interval);
});
}
Demo: http://jsfiddle.net/mattball/9veUQ
So how can I get a continuous update on the cursor position?
Use mousemove to capture the event.
$.fn.contmousedown = function(mousedownCallback)
{
var interval,
self = this,
event;
$(this).mousemove(function(e)
{
event = e;
});
$(this).mousedown(function ()
{
interval = setInterval(function()
{
mousedownCallback.call(self, event);
}, 0);
});
$(this).mouseup(function()
{
clearInterval(interval);
});
};
Demo: http://jsfiddle.net/mattball/dVaWS/
Ok with this..
$(window).scroll(function()
{
$('.slides_layover').removeClass('showing_layover');
$('#slides_effect').show();
});
I can tell when someone is scrolling from what I understand. So with that I am trying to figure out how to catch when someone has stopped. From the above example you can see I am removing a class from a set of elements while the scrolling is occurring. However, I want to put that class back on when the user stops scrolling.
The reason for this is I am intent on having a layover show while the page is scrolling to give the page a special effect I am attempting to work on. But the one class I am trying to remove while scrolling conflicts with that effect as its a transparency effect to some nature.
$(window).scroll(function() {
clearTimeout($.data(this, 'scrollTimer'));
$.data(this, 'scrollTimer', setTimeout(function() {
// do something
console.log("Haven't scrolled in 250ms!");
}, 250));
});
Update
I wrote an extension to enhance jQuery's default on-event-handler. It attaches an event handler function for one or more events to the selected elements and calls the handler function if the event was not triggered for a given interval. This is useful if you want to fire a callback only after a delay, like the resize event, or such.
It is important to check the github-repo for updates!
https://github.com/yckart/jquery.unevent.js
;(function ($) {
var on = $.fn.on, timer;
$.fn.on = function () {
var args = Array.apply(null, arguments);
var last = args[args.length - 1];
if (isNaN(last) || (last === 1 && args.pop())) return on.apply(this, args);
var delay = args.pop();
var fn = args.pop();
args.push(function () {
var self = this, params = arguments;
clearTimeout(timer);
timer = setTimeout(function () {
fn.apply(self, params);
}, delay);
});
return on.apply(this, args);
};
}(this.jQuery || this.Zepto));
Use it like any other on or bind-event handler, except that you can pass an extra parameter as a last:
$(window).on('scroll', function(e) {
console.log(e.type + '-event was 250ms not triggered');
}, 250);
http://yckart.github.com/jquery.unevent.js/
(this demo uses resize instead of scroll, but who cares?!)
Using jQuery throttle / debounce
jQuery debounce is a nice one for problems like this. jsFidlle
$(window).scroll($.debounce( 250, true, function(){
$('#scrollMsg').html('SCROLLING!');
}));
$(window).scroll($.debounce( 250, function(){
$('#scrollMsg').html('DONE!');
}));
The second parameter is the "at_begin" flag. Here I've shown how to execute code both at "scroll start" and "scroll finish".
Using Lodash
As suggested by Barry P, jsFiddle, underscore or lodash also have a debounce, each with slightly different apis.
$(window).scroll(_.debounce(function(){
$('#scrollMsg').html('SCROLLING!');
}, 150, { 'leading': true, 'trailing': false }));
$(window).scroll(_.debounce(function(){
$('#scrollMsg').html('STOPPED!');
}, 150));
Rob W suggected I check out another post here on stack that was essentially a similar post to my original one. Which reading through that I found a link to a site:
http://james.padolsey.com/javascript/special-scroll-events-for-jquery/
This actually ended up helping solve my problem very nicely after a little tweaking for my own needs, but over all helped get a lot of the guff out of the way and saved me about 4 hours of figuring it out on my own.
Seeing as this post seems to have some merit, I figured I would come back and provide the code found originally on the link mentioned, just in case the author ever decided to go a different direction with the site and ended up taking down the link.
(function(){
var special = jQuery.event.special,
uid1 = 'D' + (+new Date()),
uid2 = 'D' + (+new Date() + 1);
special.scrollstart = {
setup: function() {
var timer,
handler = function(evt) {
var _self = this,
_args = arguments;
if (timer) {
clearTimeout(timer);
} else {
evt.type = 'scrollstart';
jQuery.event.handle.apply(_self, _args);
}
timer = setTimeout( function(){
timer = null;
}, special.scrollstop.latency);
};
jQuery(this).bind('scroll', handler).data(uid1, handler);
},
teardown: function(){
jQuery(this).unbind( 'scroll', jQuery(this).data(uid1) );
}
};
special.scrollstop = {
latency: 300,
setup: function() {
var timer,
handler = function(evt) {
var _self = this,
_args = arguments;
if (timer) {
clearTimeout(timer);
}
timer = setTimeout( function(){
timer = null;
evt.type = 'scrollstop';
jQuery.event.handle.apply(_self, _args);
}, special.scrollstop.latency);
};
jQuery(this).bind('scroll', handler).data(uid2, handler);
},
teardown: function() {
jQuery(this).unbind( 'scroll', jQuery(this).data(uid2) );
}
};
})();
I agreed with some of the comments above that listening for a timeout wasn't accurate enough as that will trigger when you stop moving the scroll bar for long enough instead of when you stop scrolling. I think a better solution is to listen for the user letting go of the mouse (mouseup) as soon as they start scrolling:
$(window).scroll(function(){
$('#scrollMsg').html('SCROLLING!');
var stopListener = $(window).mouseup(function(){ // listen to mouse up
$('#scrollMsg').html('STOPPED SCROLLING!');
stopListner(); // Stop listening to mouse up after heard for the first time
});
});
and an example of it working can be seen in this JSFiddle
ES6 style with checking scrolling start also.
function onScrollHandler(params: {
onStart: () => void,
onStop: () => void,
timeout: number
}) {
const {onStart, onStop, timeout = 200} = params
let timer = null
return (event) => {
if (timer) {
clearTimeout(timer)
} else {
onStart && onStart(event)
}
timer = setTimeout(() => {
timer = null
onStop && onStop(event)
}, timeout)
}
}
Usage:
yourScrollableElement.addEventListener('scroll', onScrollHandler({
onStart: (event) => {
console.log('Scrolling has started')
},
onStop: (event) => {
console.log('Scrolling has stopped')
},
timeout: 123 // Remove to use default value
}))
You could set an interval that runs every 500 ms or so, along the lines of the following:
var curOffset, oldOffset;
oldOffset = $(window).scrollTop();
var $el = $('.slides_layover'); // cache jquery ref
setInterval(function() {
curOffset = $(window).scrollTop();
if(curOffset != oldOffset) {
// they're scrolling, remove your class here if it exists
if($el.hasClass('showing_layover')) $el.removeClass('showing_layover');
} else {
// they've stopped, add the class if it doesn't exist
if(!$el.hasClass('showing_layover')) $el.addClass('showing_layover');
}
oldOffset = curOffset;
}, 500);
I haven't tested this code, but the principle should work.
function scrolled() {
//do by scroll start
$(this).off('scroll')[0].setTimeout(function(){
//do by scroll end
$(this).on('scroll',scrolled);
}, 500)
}
$(window).on('scroll',scrolled);
very small Version with start and end ability
This detects the scroll stop after 1 milisecond (or change it) using a global timer:
var scrollTimer;
$(window).on("scroll",function(){
clearTimeout(scrollTimer);
//Do what you want whilst scrolling
scrollTimer=setTimeout(function(){afterScroll()},1);
})
function afterScroll(){
//I catched scroll stop.
}
Ok this is something that I've used before.
Basically you look a hold a ref to the last scrollTop().
Once your timeout clears, you check the current scrollTop() and if they are the same, you are done scrolling.
$(window).scroll((e) ->
clearTimeout(scrollTimer)
$('header').addClass('hidden')
scrollTimer = setTimeout((() ->
if $(this).scrollTop() is currentScrollTop
$('header').removeClass('hidden')
), animationDuration)
currentScrollTop = $(this).scrollTop()
)
please check the jquery mobile scrollstop event
$(document).on("scrollstop",function(){
alert("Stopped scrolling!");
});
For those Who Still Need This Here Is The Solution
$(function(){
var t;
document.addEventListener('scroll',function(e){
clearTimeout(t);
checkScroll();
});
function checkScroll(){
t = setTimeout(function(){
alert('Done Scrolling');
},500); /* You can increase or reduse timer */
}
});
This should work:
var Timer;
$('.Scroll_Table_Div').on("scroll",function()
{
// do somethings
clearTimeout(Timer);
Timer = setTimeout(function()
{
console.log('scrolling is stop');
},50);
});
Here is how you can handle this:
var scrollStop = function (callback) {
if (!callback || typeof callback !== 'function') return;
var isScrolling;
window.addEventListener('scroll', function (event) {
window.clearTimeout(isScrolling);
isScrolling = setTimeout(function() {
callback();
}, 66);
}, false);
};
scrollStop(function () {
console.log('Scrolling has stopped.');
});
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
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