jQuery - delete element if exists body area - javascript

I am using jQuery animate to change the position of multiple elements on the page (decorative elements). I want the element to be deleted if it exits body area. (if left is larger than body width or top is larger than body height).
The following can not be used in my case:
overflow hidden for the body
manually animating the element. I want to use jQuery animate to keep it simple (I dinamically create elements, animate them then I don't care about them, don't keep track of them, they have a .remove() methode when the animation is complete)
http://jsfiddle.net/a7Nck/
So in this JSfiddle I want the red div to dissappear when it reaches right edge of the body so that no scrollbars will appear.
Isn't there any CSS3 media query for example so that if a div is not in the viewport it will be hidden?
EDIT:
I just thought of a solution: get the width of the body prior to triggering the animation and then animate the top and left by using the minimum between the body size and what the animation should do. The problem is that this will affect animation speed.

You can use animate's step function.
The second version of .animate() provides a step option — a callback function that is fired at each step of the animation. This function is useful for enabling custom animation types or altering the animation as it is occurring. It accepts two arguments (now and fx), and this is set to the DOM element being animated.
var w = $(window).width()
$('div').animate({
left: '20px'
}, 500).delay(1000).animate({
left: '2000px'
}, {
step: function(now, fx) {
if (now > w) {
$(fx.elem).remove()
}
}
}, 1000);
Fiddle

One possible workaround (assuming your first restriction is about globally adding overflow: hidden on your CSS): add overflow: hidden with js when the animation starts, and remove it when it ends:
$('body').css('overflow', 'hidden');
$('div').animate({left: '20px'},400).delay(1000).animate(
{left: '2000px'},1000, false, function(){
$(this).hide();
$('body').css('overflow', 'auto');
});​
http://jsfiddle.net/a7Nck/3/

Just hide the div when the last animation get completed i.e.
$('div').animate({left: '20px'},400).delay(1000).animate({left: '2000px'},1000, function(){ $(this).hide(); });
See DEMO

As soon as the div leaves the visible area, the scrollbar will appear. If you want to prevent the scrollbar from appearing, you can't allow the div to leave the screen. Here's my solution:
$('div')
.animate({left: '20px'},400)
.delay(1000)
.animate(
{left: ($(window).width()-$('div').width()) + "px"},
1000,
null, // default easing
function() { $('div').hide() }
);
Jsfiddle: http://jsfiddle.net/j4rdA/1/
​

Related

Javascript focusing a large div with fixed header

I'm using a tiny library called '$.scrollTo' to animate a scroll to a div element in my html. at the top of my page I have a fixed navgation bar.
at the end of the animation, I would like to have that div focused (for accessibility). if my div is to large, at the end of the animation, the fact that it gets focus - simply sends it a bit off the screen.
This does not happen with small divs.
here is my code (check jsfiddle below):
$('#buttonid').on("click", function() {
//fixed nav bar height (to compensate when scrolling)
var fixed_navbar_height = $("#navbar-id").height();
//the element to scroll to
var $go_to_selector = $("#topic2");
$.scrollTo($go_to_selector, {
duration: 1000,
offset: -fixed_navbar_height,
onAfter: function() {
//if you comment out this .focus it works as intended.
$go_to_selector.focus();
}
});
});
here is a JSFIDDLE example:
https://jsfiddle.net/dy35obpq/3/
obviously the onAfter messes it up, but i would like both the animation and the focus. Any ideas on how to implement a focus on a large div without letting it change the scroll bar ? suggestions are more than welcome.
Try this.
onAfter: function() {
$go_to_selector.focus();
$(window).scrollTop($($go_to_selector).offset().top - fixed_navbar_height);
}
I have simply added this line in your onAfter callback.
$(window).scrollTop($($go_to_selector).offset().top - fixed_navbar_height);
and it seems to have fixed the problem while still retaining focus. You might want to use css to disable the focus blue highlight.

why the animation do not work properly in my slider?

I have a jQuery simple slider it has 15 picture each five show in a slide. I have a previous button and next button.
Each next click generate a left movement by 855px with a slider animation.
Each previous click generate a right movement by 855px with a slider animation.
This is my jQuery code :
$(document).ready(function(){
$(".prev_button").click(function(){
$("ul.slider").animate({
left: "+=855"
}, 3000, function(){
$("ul.slider").css('left', '0');
li_no = 0;
$("ul.slider").find("li").each(function(){
li_no = li_no + 1;
});
slide_after_this = li_no - 6;
$('ul.slider li:gt('+slide_after_this+')').prependTo('ul.slider'); // << line changed
});
});
$(".next_button").click(function(){
//alert($("ul.slider").css("right"));
$("ul.slider").animate({
right: "+=855"
}, 3000, function(){
//alert($("ul.slider").css("right"));
$("ul.slider").css('right', '0');
$('ul.slider li:not(:nth-child(n+6))').appendTo('ul.slider');
});
});
});
Now I have two problems :
First one is with the previous button (left arrow) When I click it the animation shows and the elements changed but they do not wrapped with each other (I mean does not show the last elements immidiatly before the first element). I can not find the reason of this.
Second problem is with both right and left arrows it is like following :
If I click just the right arrow the slider working fine it animates and change the elements but If I click the both button in order (I mean right then left or left then right ) the elements change but the animation does not show. but I check if the routine go inside the animate function by some alerts and it is going inside but does not animate on the screen .
This is a link that may help you:
http://jsfiddle.net/mpx83tpv/18/
you are really close try overflow:hidden for .slider_container
div.slider_container
{
height:380px;
width:855px;
margin-left:auto;
margin-right:auto;
overflow:hidden;
}
edit js:
also use below code as you are using both right and left in the end the slider has both of them one of them is always zero.
$(document).ready(function(){
$(".prev_button").click(function(){
$("ul.slider").animate({
left: "+=855"
}, 3000);
});
$(".next_button").click(function(){
//alert($("ul.slider").css("right"));
$("ul.slider").animate({
left: "-=855"
}, 3000);
});
});
if you want a infinite scrolling you need to use right and left in this case replace your $("ul.slider").css('right', '0'); line to $("ul.slider").css('right', ''); do same for left as well, as you need the remove them.
for adding the next visible div implement you logic before the animation as you callbacks do it after the animation.
the tricky part would be the prev button for this after calculation of the div count you also need the set new left without animation and then call left move animation.
hope these make sense.

Choosing Parent Height With white-space:nowrap

So I have these DIVs which I have arranged to slide left an right inside of the parent.
See the following JSFiddle to see the design:
http://jsfiddle.net/StevP/C9WL7/
You can see that by adjusting the margin-left of the first child DIV by multiples of -100%, it's rather simple to correctly horizontally position the DIVs inside the parent. Therefore, it's very easy to animate.
Now, this brings me to my issue. I'm using jQuery to move them left and right. It works great. However, I'd like to choose which child the parent gets its height from.
I know, I can just add...
$('#parent').height($('.child:eq()').outerHeight());
...Which is what I have it currently doing. However, the contents of the children are likely to change causing them to resize (by animate) and, therefore, be cut off. So, having a set height isn't a possibility.
I need to use height:auto; on the parent and somehow cause it to ignore the heights of specific children. I can't for the life of me think of a way.
I don't want to use a timer and onresize/.resize() don't seem to work with my Chrome.
You could use jQuery to monitor the DOM subtree and adjust the height of your parent div in the callback like this:
$('.content').bind('DOMSubtreeModified', function(e) {
if (e.target.innerHTML.length > 0) {
$(".parent").height($(".content").height());
}
});
Here's a working jsfiddle: http://jsfiddle.net/9386d/
And a question explaining the dom subtree: jQuery watch for domElement changes?
jQuery docs for bind(): http://api.jquery.com/bind/
Well... To be perfectly honest I'm not really a huge fan of jQuery anymore so I feel bad offering this answer. It just feels so frik'n inefficient, but here is a solution that does three things: 1) it resizes the hight of the container on step and uses a CSS transition attribute for eye candy (works just as well without). 2) it sets the child height of all but the current child to 0 and uses overflow:hidden so they don't affect the flow of the document anymore. 3) it resets these children to automatic height on animation start so they are visible during transition. All I can say is "yuck", but it does work.
CSS
.child{
...
overflow:hidden;
}
jQuery
var animation_prefs = {
duration: 3000,
start: function() {
$('.child').height('auto');
},
step: function(now) {
var current_index = (Math.floor((now + 50) / 100) * -1);
$('#parent').height($('.child:eq(' + current_index + ')').outerHeight());
$('#parent').data('current', current_index);
},
complete: function() {
$('#parent').height('auto');
$('.child:not(:eq('+$('#parent').data('current')+'))').height(0);
}
}
$('.child:eq(0)').animate(
{
marginLeft:'-200%' //~ Move it back 2 children
},
animation_prefs
).animate(
{
marginLeft:'-100%' //~ Move it back 1 child
},
animation_prefs
).animate(
{
marginLeft:'-200%' //~ Move it back 2 children again
},
animation_prefs
);
Demo
http://jsfiddle.net/Gq4xs/show
Source
http://jsfiddle.net/Gq4xs/

jQuery animate on property change

I have I div or some other element which I load content into with:
$('#my_div').load('ajax.php',function(){
//Do random stuff.
}
However the height of the div will then change, causing the page to jump up and down, looking ugly.
Is there a way for it to animate the height when the new content is loaded or changed? I know one can do this with FluidMoveBehavior in C#.
How can I achieve the same effect with Javascript/jQuery?
Here's some Fiddle
When you want to create a height or width animation with jQuery you have to set a number indicating the desired size. I assume that you use height: auto in this case so you have to find a little workarround.
Get the height:
var autoHeight = $("#content").height("auto").height();
Animate to autoHeight:
$("#content").animate({height: autoHeight}, 1000);
And together:
var currentHeight = $("#content").height();
var autoHeight = $("#content").height("auto").height();
$("#content").height(currentHeight);
$("#content").animate({height: autoHeight}, 1000);
Stolen from here
What I do is the opposite. I animate the page to scroll to the top if not already BEFORE I call the load.
So that the top of any new dynamic content is always in view.
I know this isn't the answer you were looking for, but I've found it works best.
You could hide #my_div before the load(), and then slideDown() in the complete function:
$('#my_div').hide().load('ajax.php', function() {
$(this).slideDown();
});
Or, create a temporary element, hide it, append it, use its height to animate #my_div once the load is complete, and then remove it.
$('<span/>').hide().appendTo('body').load('ajax.php', function(text) {
$('#my_div').animate({ height: $(this).height() }, '800').html(text);
$(this).remove();
});

jquery .animate() - this code sort of does what i want

I am trying to make a div slide down when the mouse moves over another div just above it. Basically the div above it is just the trigger that makes the div slide down. Mouseover of .trigger makes .slidedown expand, and mouseout of .slidedown makes itself slide back up. Here's the code i have so far:
$(document).ready(function() {
$('.slidedown').hide();
//When mouse rolls over
$('.trigger').mouseover(function(){
$('.slidedown').stop().animate({
height: ['toggle', 'swing'],
}, 600, function() {
// Animation complete.
});
});
//When mouse is removed
$('.slidedown').mouseout(function(){
$('.slidedown').stop().animate({
height:'0px'
}, 600, function() {
// Animation complete.
});
});
});
This works, but there are just two teaks i need help with. Firstly, after mouseout and the .slidedown div slides up and disappears, if i then mouse over the .trigger div again, nothing happens. It should make the .slidedown move down again. I need it to every time keep working. I tried removing the .stop() but it still doesn't work.
Also can i make it also slide back up if the mouse moves out of .trigger but only if it isn't moving out of .trigger into .slidedown? This is so incase the user doesn't move the mouse into .slidedown, it would remain forever which isn't good. Or just have a time limit that it can remain expanded if the mouse doesn't move over .slidedown.
Second, is there a way to make a delay of around 1 second between mouseout and the div sliding back up? Thanks for your help!
You might try using the jQuery hover event. For the delay, you can put the closing animation in setTimeout:
$(document).ready( function(){
$('.trigger').hover( function(){ // enter animation
$('.slidedown').stop(true,true).animate({
height: ['toggle', 'swing'],
}, 600, function() { /* animation done */ });
}, function(){ // leave animation
setTimeout( function(){
$('.slidedown').stop(true,true).animate({
height: '0px',
}, 600, function() { /* animation done */ });
}, 1000 );
});
});
You might also look into the hoverIntent plug-in for more nuanced control over the mouseenter/mouseleave behavior, including timing.
I think you'll find that setting a numerical height in $('.trigger').mouseover() may help the animation be repeatable. FYI, you can set an integer number for something like height or width in jQuery and it will automatically set the unit to px for you.
As Ken pointed out, setTimeout is useful for a delay in code, but keep it in your $('.slidedown').mouseout() event or the slideown div will hide after you mouseout of the trigger div instead of when you leave the slidedown div as you specified.

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