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CSS: Transition of horizontal scroll menu is not smooth

I would like to make the transition of the menu to be smooth. The problem is when you click the arrows, the 2nd div will show on the bottom of the 1st div, making it not smooth to look at. pls see below for my code:
Pls see my code here:
http://www.codeply.com/go/mdMPOkmFVH

in your code you need to do some basic change in CSS, your CSS should be as follows
.btn-arrow {
display: inline-block;
text-align: center;
}
.effects-list {
text-align: center;
}
.col-xs-4 {
min-height:20px;
}
Here you need to set minimum height 20px for class .col-xs-4, The reason behind this is the jquery function needs to set sliding element to have position absolute, and you were setting it to relative by force. and if all child elements in divs are absolute elements, then absolute elements won't acquire it's space in parent div and that is why it will make parent div's acquired content will be empty. so it will treat it as empty div and set it's height as 0px, and won't show anything in the div... so here we are specifying it's minimum height to solve our issue.
Another thing that we could have done is adding white space to the parent div
e.g.
<div class="col-xs-4" id="effects_menu"> </div>

How to stop a parent div expanding vertically when child div becomes visible

I have a parent div that has a height set on it.
There are child divs inside of it with initial visibility turned off.
When I make it visible, the parent div expands vertically. I dont want that.
Background:
I'm using DataTables, with the scroller and filterColumn plugins.
The header of my table has an action on it assigned by jQuery that when I click on the a column header, a div is to appear below it and show some content.
Issue is, when it appears, the header div expands.
I've tried overflow: hidden, auto, etc, but the closest i can get is the scrolling body seems to cover the floating div. I also set the z-index to above the scroller, but that doesnt do anything either.
Any suggestions?

You can give the parent div a fixed height
.parent {
height: 400px;
}
and make your child div have absolute position
.child {
position: absolute;
}

use position:absolute on the element being shown to remove it from the page's flow. this will prevent it from affecting the width of the parent div.

make the whole page scroll beneath a certain height at the top without any scroll bar

html:
<div class="div_fixed"></div>
<div class="other_content">
content goes here
</div>
css:
.div_fixed{
position:fixed;
height:40px;
}
.other_content{
height:200px;
}
The div_fixed will remain fixed at the top position of the page.
But as the page scrolls up, the content of the div other_content will vanish just at the lower edge of the div div_fixed .
In the case of scrolling down the invisible content of other_content will begin to be visible from the lower edge of the div_fixed
How to achieve that ?
EDIT: no scroll bar should appear for any div

Use overflow: hidden to get rid of scrollbars

Is this what you're looking for? http://jsfiddle.net/BCRPa/

I've taken your HTML/CSS and added a bit on a jsFiddle - I think in order to achieve the effect you're looking for, you just need to make your content actually tall enough to be scrollable. At 200px high and one line of text, nothing is going to scroll.
So I made your other_content div taller, and then added a top: 0 to your .div_fixed selector, to keep it stuck to the top of the screen, and a margin-top: 40px to the .other_content div in order to have it start below the floating div.
If you want it to be a navbar-type thing, you can of course add a width: 100% to the .div_fixed.
All of this should transfer into a container div (with position: relative) fairly easily as well if you want, although you may have to re-position the fixed div.

toggle jquery - issue

I have this demo
However the mouse over when dragged to left or right stops the toogle.
The hover() event didn't solve the problem.
Any idea ?
div.fileinputs {
position: relative;
display: none;
}
#show {
width: 200px;
height: 40px;
background-color: red;
z-index: -2px;
position: absolute;
}
<div id="show"></div>
<div class="fileinputs">Visible Panel Div</div>
$('#show').mouseover(function() {
$('.fileinputs').toggle();
});

Given that you want to simply show the element on mouseover and then hide it on mouseout, you should also use mouseout() to define the desired behavior you want when the mouse is removed:
$("#show")
.mouseover(function(){
$(".fileinputs").toggle();
})
.mouseout(function(){
$(".fileinputs").toggle();
});
Example. (It's choppy because fileinputs is a separate element, and it's not counting hovering over that as hovering over the show div).
But you should use hover, just to make it easier:
$("#show").hover(function(){
$(".fileinputs").show();
}, function(){
$(".fileinputs").hide();
});
Example. (Choppy for the same reason as above).
Since your desired behavior is definite, we'll just use show() for when the mouse is over it and hide() when it is removed.
By the way, it is preferred that you bind events using delegate() (for older versions of jQuery) or on() (for jQuery 1.7+):
$(document).on("mouseover mouseout", "#show", function(){
$(".fileinputs").toggle();
});
Example.
Though, you really should just use CSS for this. You can place fileinputs inside of show and use a child selector:
#show:hover > .fileinputs {
display: block;
}
Example. This one doesn't flicker because the element is inside the one that's getting the hover declarations attached to it, and CSS considers it as though you are still hovering over the parent element (because you technically are, as the target of the hover is within the boundaries of the parent [it would still work if it was outside the boundaries because the element is still nested]).

I think it's because you set your z-index on show to be -2. Once the fileInputs div is visible, it becomes on top of show, and as a result, mouseover for show no longer responds.
If you notice, if you hover from left to right over the red show div, but just below where the text is, the fileinputs div does in fact toggle.

If you add a border around the fileinputs div, the cause of the behavior will be clearer.
See: http://jsfiddle.net/pS9L8/
Moving your cursor over the region where the two divs overlap triggers a mouseover event, showing the hidden fileinputs div. Since that div is now displayed on top of show, your cursor is no longer directly over the original show div. You then continue to move your cursor, and as it moves outside the fileinputs region, that move is seen as another entrance to the underlying show div. Which again triggers the .toggle(), re-hiding the fileinputs div.
One quick fix is to switch to the jQuery custom event mouseEnter instead of mouseover (although you may get some jerky artifacts as jQuery reasons about the meaning of "over"). Depending on what you're trying to achieve, another option would be to reorder the two divs by z-index.

Hide an element without masking item over top

I've created an effect whereby an HTML element is initially hidden behind another HTML element, and the CSS 'top' value of the hidden element is animated to expose it from beneath the masking element in a smooth sliding motion.
Does anyone know if there is a way to recreate this effect without the masking element on top?
I want to avoid the jQuery'esque slideDown where the height of the element being shown is animated.
I have the feeling that this just isn't possible, but if someone is otherwise aware, your advise would be much appreciated.

You can easily do this with a wrapper that has overflow set to hidden
http://jsfiddle.net/xvNf6/1/
HTML
<div id="wrapper" style="height:0px;">
<div>content</div>
</div>
Sample CSS
#wrapper{width:300px;height:280px;margin:0 auto; overflow:hidden; background:#eee}
Javascript
//if you must not use jQuery
var animationTimer = setInterval(function(){
var wrapper = document.getElementById("wrapper");
wrapper.style.height = (parseInt(wrapper.style.height) + 1) + "px";
if(parseInt(wrapper.style.height) >= 280)
clearInterval(animationTimer)
},1);
//if you can use jQuery
$("#wrapper").animate({height:"280px"},1000);

Place your element within a parent div with overflow:hidden. Then, position your element beyond bounds of the parent div so that it is hidden.
#wrapper { overflow: hidden; }
#target { height: 100px; top: -100px; } /* shift element out of view */
You can then reveal it by animating to {"top":0} to get the slidedown effect that doesn't resize the height of the element.
Here's a rather crude demo: http://jsfiddle.net/7RSWZ/
Update: Here's another demo that attempts to deal better with different content sizes by dynamically setting the heights and top values. http://jsfiddle.net/7RSWZ/2/