Develop Reference

Menu animation slide from top function

I would like to add a menu like the one in this demo site Here
it drops down from the top of the page as you can see and i would like to know if this was done with only CSS3 or .
If someone can show me a simple function so i can go off it that would be nice!
EDIT: ok i found the code snippet for it I think , i still want to know if this is a good way to do it , and if someone can make this more simple, seems like a lot of code just for that
var isUp = false;
var navHeight = $('#navContainer').height();
var hideHeight = navHeight - 50;
$('#arrowLink a').click(function(e){
e.preventDefault();
navHeight = $('#navContainer').height();
hideHeight = navHeight - 50;
$('.tooltip').remove();
if(!isUp){
$(this).find('img').attr('src',template_directory+'/images/menu_hide_arrow_bottom.png');
$(this).find('img').attr('title',showNav);
$( "#navContainer" ).animate({
top: '-='+ hideHeight + 'px'
}, 500, "swing", function() {
isUp = true;
});
}else{
$(this).find('img').attr('src',template_directory+'/images/menu_hide_arrow_top.png');
$(this).find('img').attr('title',hideNav);
$( "#navContainer" ).animate({
top: "0"
}, 500, "swing", function() {
isUp = false;
});
if($('body').hasClass('body_show_content'))
{
$('#mainContainer').fadeIn();
}
}
});`

Yes, it can be done. You can use css transition/keyframes and a click event.
Code
html
<div id="container hidden">Something</div>
css
#container {
postion:fixed;
-webkit-transition: all 2s;
transition: all 2s;
}
.hidden {
top: -25px;
}
js
$('#container').click(function(){
$(this).toggleClass('hidden');
});
Explanation
Your menu is fixed at the top of the page. Whenever you toggle the button that displays/hides it, you can add a css class that changes the position of the element. Because you have transition on the element, it will animate to that new location. This can also be done using keyframes instead of transition to have more control.
css transition
css keyframes

If you want to achieve this using pure css, you need to make use of transition effect. Check out the fiddle which gives a fair idea of something similar.
FIDDLE

jQuery change css properties smoothly on scroll

I want to change the height of the header and add a class to it on the scroll. However I want to do it smoothly using the jQuery animate (or similar effect).
The idea is to make the header sticky on the scroll and remove the sub header from it when it is in sticky form. That's why I fade out subheader when it is being scrolled. Is there a better way to do that?
I have managed to do that with following code, however if you see the demo, the css changes are not smooth, it somehow jerky.
Demo:
http://jsfiddle.net/kcW9a/
Here's the code:
var height = $('header').outerHeight();
$(window).scroll(function() {
if($(this).scrollTop() > height)
{
$("header .subheader").fadeOut(200);
$('header').addClass('stick');
$('header').stop().animate({'height' : '50'}, 200);
}else if($(this).scrollTop() <= height)
{
$('header').removeClass('stick');
$("header .subheader").fadeIn(200);
$('header').stop().animate({'height' : '100'}, 200);
}
});
$(window).scroll();

Change css style for fixed head with your sticky head effect
header{
height: 100px;
background: green;
position:fixed;
width:100%;
}

Try using a callback to the fadeOut() call. Fiddle: http://jsfiddle.net/myTerminal/kcW9a/1/
fadeOut(200, function () { $('header').addClass('stick'); });

$(window).scroll(function() {
if($('#main').offset().top === 0) {
$('.subheader').fadeIn(600);
$('#main').stop().animate({ height: '100px' }, 300).removeClass('stick');
}
else {
$('.subheader').fadeOut(1);
$('#main').stop().animate({ height: '50px' }, 300).addClass('stick');
}
});

Slide Down to normal width?

I have a div box, with a lot of p tags in side, and it is getting very long.
So I added on the top of the box, a show more text.
The box have a height: 100px; overflow: hidden;, but then when someone click on show more, I would like it to slideDown the box, to get the normal height, which it would have had if height: 100px; was not set.
Any idea how to do this?
I tried the following: (Note, the box have class .show-limited-content and the show more have class .show-more)
$('.show-more').live("click", function() {
$('.show-more').live("click", function() {
$('.show-limited-content').slideDown("slow");
});
return false;
});

You could use the animate method.
It would look something like the following, depending on how your html is written:
$('.show-more').on("click", function() {
$('.show-limited-content').animate({
height: '500px'
}, 2000);
return false;
});
See this working example to see it in action.
If you need the height dynamically, just add
var curHeight = $('.show-limited-content').height();
$('.show-limited-content').css('height', 'auto');
var autoHeight = $('.show-limited-content').height();
$('.show-limited-content').height(curHeight);
above the event handler and change the animate css to
height: autoHeight
Here is another example.

Possible to toggle/animate between two sizes using jQuery?

Basically I have a small div that is initially styled to 60x60. I have created click event that animates the expansion of the div:
$("#myDiv").click(function () {
$(this).animate(
{
width: "350px",
height: "300px"
}, 500);
}
I would like to reverse this animation if someone clicks the div again. Is there anyway to toggle between the original size and the expanded size (still using the animate function) with each click?
I found the toggleClass function but I don't think this will work with animiate.
You can see a basic fiddle here: http://jsfiddle.net/NS9Qp/

$("#myDiv").toggle(function() {
$(this).stop().animate({
width: "350px",
height: "300px"
}, 500);
}, function() {
$(this).stop().animate({
width: "60px",
height: "60px"
}, 500);
});
Example.
The jQuery toggle() function allows you to define two or more functions to cycle through on each mouse click. In this case, the first one (triggered on the first click) expands the div and the second one (triggered on the second click) resets it. On the third click, it starts back at the first one, and so on.
More about toggle() here.

just to be different :
var size=[];
$("#cornerBox").click(function(){
$(this).width() >= 350 ? size=[60, 60] : size=[350, 300];
$(this).stop().animate({ width: size[0], height: size[1] },500);
});
Fiddle: http://jsfiddle.net/NS9Qp/1/

I ended up using jQuery UI's animated toggleClass effect: http://jqueryui.com/demos/toggleClass/
super simple code:
$('h2').click(function() {
$(this).next().toggleClass("hidden", 1000);
});

Do not hardcode css styles (in my example I used inline css for myDiv element, put this in css files).
<div id="myDiv" style="background:red; width: 60px; height: 60px;"></div>
<script type="text/javascript">
var div = $('#myDiv');
div
.attr('defWidth', div.width())
.attr('defHeight', div.height())
.toggle(function() {
$(this).stop().animate({width: "350px", height: "300px"}, 500);
}, function() {
$(this).stop().animate({width: $(this).attr('defWidth'), height: $(this).attr('defHeight')}, 500);
}
);
</script>

What I do for cases like this, is store a transformation array.
var transforms = { 'height0': 60, 'width0': 60, 'height1': 300, 'width1': 350};
Then, store a toggle between 0 or 1, and use the corresponding values for the animation.
EDIT: combine this with the previous example of toggle, and you've got yourself a solid working solution!

Setting height of text area based on text inside of it using jQuery

I have a <textarea> element in my form that has this code attached to it:
$('#links').focusin(function() {
$('#links').animate({
height: '100px'
}, 300, function() {
// done
});
});
This works perfectly, when the text area gets focus it increases in height nicely to 100px. Now, I want it to shrink back down to a suitable size based on the text inside it when it loses focus. I wrote this:
$('#links').focusout(function() {
$('#links').animate({
height: 'auto'
}, 300, function() {
// done
});
});
But it doesn't work, it just stays at the same height (100px). Is there any way to do this?
Thanks. :)
Edit: To save some confusion, the even handler for $('#links').focusout works fine, that's the first thing I tested. So I assume it's a problem with the animation or the CSS property.

Try $( '#links' ).blur( function(){ ... } ) instead
http://api.jquery.com/blur/
Edit, your actual code:
$('#links').blur(function() {
$('#links').animate({
height: 'auto'
}, 300, function() {
// done
});
});
Some other notes.. You can use $( '#links' ).focus() instead of focusin, and also, once you're in the function, you can use $( this ).animate(), as a shortcut. Just little tips and whatnot.

This isn't quite the same as what you're doing, but quite similar: http://james.padolsey.com/javascript/jquery-plugin-autoresize/

auto_height_link = $( '#links' ).css('height');
$('#links').focusin(function() {
$(this).animate({
height: '100px'
}, 300, function() {
// done
});
}).focusout(function() {
$(this).animate({
height: auto_height_link
}, 300, function() {
// done
});
});
but anyways the animate doesnt read the css value auto for height
i stumbled upon this http://www.unwrongest.com/projects/elastic/ which is what you need i guess

You can't use auto to animate in jQuery. You should set it to auto, then get the actual height (in px) and finaly animate it.
Take a look here