Best Practice Combining Toggle and Hover - javascript

I have some elements which have hover effects as well as should be selected when clicked. Currently when I add the stop() to the effect it causes the animation to stop in place when clicked. I tried using fadeToggle() for the same effect but could not wrap my head around how to get it to function properly. The id I am targeting are passed to the href of the clicked element.
Can someone give pointers on the best way to write this script?
$(function() {
$("#map-hovers > ul > li").hide();
$('area').click(function(e) {
e.preventDefault();
var $hoodClick = $($(this).attr('href'));
if ($hoodClick.hasClass('selected')) {
$($hoodClick).fadeOut().removeClass('selected');
} else {
$($hoodClick).fadeIn().addClass('selected');
}
}).hover(function() {
var $hoodHoverOver = $($(this).attr('href'));
$hoodHoverOver.fadeIn();
},
function() {
var $hoodHoverOut = $($(this).attr('href'));
if ($hoodHoverOut.hasClass('selected')) {
} else {
$hoodHoverOut.fadeOut();
}
})
});

Use .stop(true, true). It skips to the end of the animation & clears the animation queue. Read more about it in the API: http://api.jquery.com/stop/

Related

To make certain JS code more important than another (disappear on mouse out)

I know this might be silly but I would like to know if there is a way to realize.
Basically, I would like the dropdown-content element to 'KEEP DISPLAYING' even after 3 secs of mouse moving-out of the parental 'dropbtn' button or element.
E.g. code:
$(function() {
$('#dropbtn').hover(function() {
$('.dropdown-content').css('display', 'block');
}, function() {
// on mouseout:
setTimeout(function(){$('.dropdown-content').css('display', 'none');}, 3000);
});
$('.dropdown-content').hover(function(){
$('.dropdown-content').css('display', 'block');
},function(){
$('.dropdown-content').css('display', 'none');
})
});
Current issue is that setTimeout() function is overriding my desired way on this particular line of JS code:
$('.dropdown-content').css('display', 'block');
In another word, I want setTimeout() to be effective if and only if I set not my mouse cursor on 'dropdown-content' div.
Hope someone can help out :)
Instead of using hover, you could use mouseenter/mouseleave to 'toggle' the .dropdown-content, except the delay of 3s on mouseleave:
$(function() {
var dropdownTimeout = null;
$('#dropbtn').mouseenter(function() {
if(dropdownTimeout) {
clearTimeout(dropdownTimeout);
dropdownTimeout = null;
}
$('.dropdown-content').css('display', 'block');
});
$('#dropbtn').mouseleave(function() {
dropdownTimeout = setTimeout(function(){$('.dropdown-content').css('display', 'none');}, 3000);
});
});

Remove transparency on menu drop down Javascript

I've been trying to implement a feature that removes the transparency of the dropdown menu on my website so that it is actually readable for visitors.
The code I am currently using, which removes transparency on scroll but not on drop down is:
$(document).ready(function(){
var stoptransparency = 100; // when to stop the transparent menu
var lastScrollTop = 0, delta = 5;
$(this).scrollTop(0);
$(window).on('scroll load resize', function() {
var position = $(this).scrollTop();
if(position > stoptransparency) {
$('#transmenu').removeClass('transparency');
} else {
$('#transmenu').addClass('transparency');
}
lastScrollTop = position;
});
$('#transmenu .dropdown').on('show.bs.dropdown', function() {
$(this).find('.dropdown-menu').first().stop(true, true).slideDown(300);
});
$('#transmenu .dropdown').on('hide.bs.dropdown', function() {
$(this).find('.dropdown-menu').first().stop(true, true).slideUp(300);
});
});
I tried changing it to this (and variations of this) but can't seem to get it to work:
$(document).ready(function(){
var stoptransparency = 100; // when to stop the transparent menu
var lastScrollTop = 0, delta = 5;
$(this).scrollTop(0);
$(window).on('scroll load resize', function() {
var position = $(this).scrollTop();
if(position > stoptransparency) {
$('#transmenu').removeClass('transparency');
} else {
$('#transmenu').addClass('transparency');
}
lastScrollTop = position;
});
$('#transmenu .dropdown').on('show.bs.dropdown', function() {
$(this).find('.dropdown-menu').first().stop(true, true).slideDown(300);
$('#transmenu').removeClass('transparency');
});
$('#transmenu .dropdown').on('hide.bs.dropdown', function() {
$(this).find('.dropdown-menu').first().stop(true, true).slideUp(300);
$('#transmenu').addClass('transparency');
});
});
Any help would be greatly appreciated!
Thanks!
Without the html that this is hooking into it's a bit difficult to answer your question.
But given the fact that scrolling gets the job done, the only element I can see that could be preventing the functionality you want is that your selector to add show event handler is either selecting nothing in particular or an element in the DOM that is not the bootstrap dropdown element that triggers 'show.bs.dropdown', which is my reasoning for the first statement.
You can try the following debug code to verify:
// Should log to console with 'selected' if selector works alternatively 'not selected'
console.log($('#transmenu .dropdown').length > 0 ? 'selected' : 'not selected');
// Log to console when show event triggered
$('#transmenu .dropdown').on('show.bs.dropdown', function() {
console.log('triggered');
});
Hope that helps you find a solution. Happy coding!
see the documentation at http://api.jquery.com/on/ and it should become obvious why your fancy named events are never being triggered (without defining any event namespace in the first place).
$('#transmenu .dropdown')
.on('show', function() {})
.on('hide', function() {});
the DOM selector also might be #transmenu.dropdown instead of #transmenu .dropdown (depending if id and class attributes are present on the DOM node to select - or if one selects the parent node by id and there is/are nested node/s with a class attribute present).

faking a Gif with javascript/jquery

I have a function that hides and shows divs on scroll based on pageY position, but I also need the ability to have it automatically hide and show divs in order(only the ones with children), sort of like a fake animated Gif, looping forever.
I tried this:
function autoPlay() {
$('.conP').each(function(){
if ($(this).children().length > 0) {
setInterval(function(){
$(this).show().delay('100').hide();
},300);
}
});
}
which is not returning any errors, but it's not hiding or showing any of the divs with class="conP".
Any suggestions as to what I'm doing wrong/how I could improve this?
try this -
function autoPlay() {
$('.conP').each(function(){
if ($(this).children().length > 0) {
var $that = $(this);
setInterval(function(){
$that.show().delay('100').hide();
},300);
}
});
}
You have an incorrect reference to this in your setInterval closure. Refer to "How this works" in JavaScript Garden.
In your case you should save the reference to this in a variable:
$('.conP').each(function() {
var $element = $(this);
setInterval(function () {
$(element).show().delay('100').hide();
}, 300);
});
Or, better use the first argument passed to each, which is equal to $(this) in this case.
Not sure it's a great idea to run intervals inside loops, but I'm guessing the issue is scope inside the interval function :
function autoPlay() {
$('.conP').each(function(i, elem){
if ( $(elem).children().length ) {
setInterval(function(){
$(elem).show().delay(100).hide();
},300);
}
});
}
I really appreciate all the help guys, I seem to have figured out the animation part:
setInterval( function() {
autoPlay();
},120);
function autoPlay() {
var backImg = $('#outterLax div:first');
backImg.hide();
backImg.remove();
$('#outterLax').append(backImg);
backImg.show();
}
By hiding whichever div is first, and removing it from-then appending it back into-the containing div, and showing the new first div, it animates quite nicely!

Remove dynamically generated div with jquery

I would like to add/remove a new div when the corresponding checkbox is checked/unchecked with jQuery. Here's my attempt:
<script type="text/javascript">
$(function() {
$("#form1 :checkbox#checkbox1").click(function() {
var d = document.createElement('div');
if ($(this).is(":checked")) {
$(d).addClass("newdiv")
.html("This is a new div")
.appendTo($("#mydiv"))
.hide()
.fadeIn(1000);
}
else {
//$(".newdiv").fadeOut(1000);
$(d).fadeOut(1000);
}
});
});
</script>
The fadeIn process comes out smoothly. But when I tried to fadeOut $(d) using the same methodology, it didn't work: the new generated div remained on the page. I did some research and get a work around, with $(".newdiv").fadeOut(1000); (commented in the code above), but that's not the best solution for me I think. And also I really want to know why my first attempt didn't work. Any suggestions? Thanks.
There are few changes you can make
1. No need for the selector #form1 :checkbox#checkbox1 since you have an id for the checkbox, you can just use #checkbox1
2. Create the div using jQuery instead of using createElement $('<div/>')
3. After fading out the div you need to remove it from the dom
$(function() {
$("#checkbox1").click(function() {
if ($(this).is(":checked")) {
$('<div/>').addClass("newdiv")
.html("This is a new div")
.appendTo($("#mydiv"))
.hide()
.fadeIn(1000);
}
else {
$('#mydiv .newdiv').fadeOut(function(){
$(this).remove()
})
}
});
});
Demo: Fiddle
Another solution is to have a static div which will be shown and hidden
$(function() {
var div = $('<div/>').addClass("newdiv")
.html("This is a new div")
.appendTo($("#mydiv"))
.hide();
$("#checkbox1").click(function() {
if ($(this).is(":checked")) {
div.fadeIn(1000);
} else {
div.fadeOut(1000)
}
});
});
Demo: Fiddle
jsFiddle Demo
Every time your click handler runs, you're creating a new variable d with a new element. Instead, do that before the click handler, so each instance will reference the same element. I have included other optional improvements below.
A change event is more appropriate for checkboxes. Also, notice I made your selector just #checkbox1, since that is already unambiguous and maximally specific.
To get a better visual effect, don't add the element, hide it, then fade it in. In most browsers that will show the element flicker before it appears. Instead, use a class to hide it with css: .hidden {display: none;}. You can also use fadeToggle to toggle the visibility, instead of doing if/else. clearQueue removes extra events for multiple clicks during a transition, and makes transitions appear smoother.
Finally, use jQuery to create the element:
$(function () {
var $d = $('<div>', {
"class": "hidden",
text: "This is a new div"
}).appendTo("#mydiv");
$("#checkbox1").change(function () {
$d.clearQueue()
.stop()
.fadeToggle(1000);
});
});
You better make d a jQuery object.
<script type="text/javascript">
$(function() {
$("#checkbox1").click(function() {
var d = $('<div class="newdiv"></div>');
if ($(this).is(":checked")) {
d.html("This is a new div")
.appendTo($("#mydiv"))
.hide()
.fadeIn(1000);
}
else {
d.fadeOut(1000);
}
});
});
</script>

Help needed Pausing/Resuming FadeIn and FadeOut

Hopefully this is a simple request. I found this code that will work perfectly for what I want to do (Rotate through list items while fading in and out) http://jsfiddle.net/gaby/S5Cjm/1/ . However, I am looking to have the animation pause on mouse over and resume on mouse out. I am a novice at the moment with Javascript and JQuery, so any help would be appreciated.
Thanks.
EDIT: Side questions: Is there a benefit to using JQuery to do this? Would a stand alone script be more appropriate?
I attached the hover event to your list items. The over function stops the animation and all following animations using jQuery.stop(true). The out function resumes the animation:
http://jsfiddle.net/US4Fc/1/
var duration = 1000
function InOut(elem) {
elem.delay(duration).fadeIn(duration).delay(duration).fadeOut(
function() {
if (elem.next().length > 0) {
InOut(elem.next());
}
else {
InOut(elem.siblings(':first'));
}
});
}
$(function() {
$('#content li').hide().hover(
function() {
$(this).stop(true)
},
function() {
var curOp = Number($(this).css("opacity"));
$(this).fadeTo(duration*(1-curOp), 1, function() {
InOut($(this))
});
}
);
InOut($('#content li:first'));
});
Will this work for you?
$(function(){
var active;
$('#content li').hide().hover(
function(){
active = $(this).stop();
},
function(){
active && InOut(active);
}
);
InOut( $('#content li:first') );
});

Categories