Translate3d adds extra space at the end of document - javascript

I made a smooth scroll on the page using transform translate3d.
But there is a problem. Translate3d adds extra space at the end of the document.
You can see it here: https://codepen.io/anon/pen/WEpLGE
I think that the problem is somewhere here:
if(Math.round(currentY) !== Math.round(destY)){
var newY = Math.round(currentY + ((destY - currentY) * 0.1));
container.css({
transform: 'translate3d(0, -' + newY + 'px, 0)'
});
}
You can see that at the end of the image container, there is an empty space.
How can I solve the problem?

Using transform does not cause the surrounding elements to reflow. Essentially this means the browser isn't rerendering the size of the containing element even though you're moving it with translate3d. The images are staying in their original spot when it comes to influencing the size of the parent container, or where text gets flowed around them but the user sees it moved by the translate.
In short, it's not adding space. That space is the space which the translated element would be taking up if it wasn't moved.
This article explains it in the third paragraph of the "Transform" section.
I'm not exactly sure what you're trying to achieve with the translate. It looks to me like it's some sort of parallax effect? I'd remove the if statement where the transform is added, and see if you're fine with that. You might try position: absolute also. I can explain why it's happening, but without more detail as to what you're trying to achieve it's going to be hard to help with a solution.
Edit:
After looking at the code, it looks like you're going for a smooth scroll effect where the images lag behind the scroll then drift into place. Kind of like scrolling on a cellphone where it drifts to its final position.
This is technically 2 questions in one, "Why is there extra space" and "how do I get this smooth scroll". I recommend you add another question, or edit this one to be more specific to one or the other. But I'll give you a hint as to how I would fix it.
My recommendation would be to change the code, not to add an incrementing offset (which is why you end up with the space at the end). But detect a scroll, add a class which shifts everything up with a css transition then when the scrolling stops remove that class so everything shifts back down.
This would leave everything in its original place on the screen when they stop scrolling instead of leaving it offset as it is now.
If you confirm this I'll give you some example code, not going to take the time on an assumption though.

Related

Split Ajax animation

I am developing a mobile web application using jQuery and i have been requested to have each page transition into the next with an animation where the page is "split in half", then have the upper part slides up and the bottom part slides down, thus revealing the next page.
I have a small idea, but i dont seem to have the knowledge to get trough:
2 Canvas with display: none, each width width: 100%, height: 50%. - Check
Have the actual display be rendered into said canvas's - I have not the slightest of ideas.
Ajax the next page in a div below both canvas's - Check
Slide the canvas's in the respective directions - Check
Set the canvas's to display: none and restore them to their original positions - Check
Any thoughts? I'm open to use any other framework appart from jQuery, if that's the need. I am also open to change my canvas idea into something else.
EDIT:
As for clarification imagine the page to be a closet, but a vertical one so its doors (the actual page) will slide into the roof and the floor respectively (Its not the greatest of comparisons, but please bear with me) and thus let you see and interact with the content of the closet (The next page). This will go on and on until the application's workflow ends at the last screen, as there will be no back button.
I'm pretty sure I know what you want. You have multiple pages in your registration/form process and instead of having the old fadein/fadeout or sliding effects, you want the top half to slide up and the bottom half to slide down. In order to do this, I'd dump the canvas idea. I don't think that there's an easy way to do it using canvas as of right now. You could try using the html2canvas script, but it's not 100% accurate when it comes to rendering things like this.
As an alternative, I'd recommend using the following process. As a preface, make sure that every step in your form has its own container div (called something obvious like "step-wrap" or "step-container"). Then, when you begin the animation, the first thing to do is to duplicate the current step-wrap, calling it something like step-wrap-animation. Give the original wrap, step-wrap, a height of 50% and position the duplicate below the first with the same height of 50%. Both of the divs should have styling that has an overflow of hidden. Make sure, also, that you set the scrollTop of the duplicate div to scroll to the bottom so that it looks like a continuation of the first div. Everything from here should be smooth sailing.
Second, once you have everything in the first step working, start the animation process. You can do this however you want now that we have the splitting functionality figured out. Make sure that before you start splitting the two divs apart you put the next step behind the previous so that it unravels.
Essentially, what you need to do is:
Duplicate the div
Position both divs (the original and the duplicate) so that both the heights equal 50% and they look like continuations of each other
Animate the top div up, bottom div down
Here's a basic fiddle illustrating how something like this should work. Click on the rendered screen to get the animation going.
Take a look at backbone.js and marionette.js based on backbone.js.
backbone.js is MVC framework where you can define separate views. Marionette is an extension which supports regions and switching views based on whatever you want. Inside switching logic you can easily implement your transitions. Very generic answer but perhaps it will help you to get started.

Controlling image movement using scroll bar of browser

I want to guide an image through a path. The scroll down of browser should bring the image down the path, and the scroll up of browser should make the image to trace back its path.
Here is an example of what I would like to acheive:
I want to guide that bug down the path as the user scrolls down through the article on the page and make it retrace its path when the user scrolls up (The bug's head will always be in the direction of motion).
How can I achieve this using jQuery and javascript?
You'll need to calculate the path you intend to use, and then bind a function to the scroll event that moves the image based on the distance scrolled, something like :
$(window).on('scroll', function(e) {
var S = $(this).scrollTop(), // scrolled distance
T = 10 + (S/24), // value for Top
L = 10 + Math.abs(Math.sin(S/400)*50); // value for Left
$("img").css({top: T+'%', left: L+'%'}); //set CSS
});​
FIDDLE
I don't believe you can directly capture the mouses scroll with javascript or jquery alone. As that works with whats part of the browser, and inside the "window". You can however capture a scroll event. Based on the windows height/width. It takes a little calculation via javascript to build a reliable/stable equation that will work on all browsers in all resolutions. I'm not going to go into details here more so due to the fact that your question is rather vague and doesn't supply a problem to be solved more than it sounds like a demand for an answer.
But the essence of what you may want to do is, get the width/height of the window/body. And through some trickery of smoke and mirrors or in this case HTML and CSS and properly laying out a bunch of layers on top of one another create a page thats a mile long, with a hidden scroll bar, that you have 2 layers on top of one acting as your "path" and the other your image.. Of which when scrolled from point a to point b is tracked via the scrolling event of the page being a mile long under it all. And then use that couples with the width/height found to make adjustments so it doesnt run off screen at any given point (less thats what you want).

Dynamic jQuery menu with sliding pictures

I need to make a dynamic jQuery menu for showing products.
There will be one main picture with text and hyperlink on it, taking 60% of the screen, and on the right of it I need three small pictures (one above the other, horizontally) with 20% width of screen (but all together taking same height as the main one).
I need help for the animation. The animation will be next:
the three pictures on the right are sliding up, and the top most disappears, and a new one is appended to the bottom (at the same time as the top most is disapearing). Now, the one that dissapeared becomes the main one.
I've made an easy solution with .slideUp function, but that doesn't actually made the div go up, instead it is just losing it's height until it becomes invisible. It is not the solution I wanted.
Thanks.
EDIT:
I've managed to get some solution with jQuery.sliedUp function, but still I didn't get the effect that the client was asking for.
Now with a little bit more search, I've found that the jQuery UI hide function extension can do the effect I am looking for.
Here's an example: http://jsfiddle.net/WMPRJ/
My problem now is if you click on the top div, while it is sliding up, the bottom div does not follow it up and take its place. I need to do that. Please provide me with a solution.
Append the current main to the bottom of your thumbnails, slide up the top one and remove() it. Take its src attribute and set it to the main image.
Here's some (sorry, not a self-contained example) code that should get you where you're going. If you actually take the time to read it you'll see it does exactly what I described in the first two sentences.
$('.thumb').first().slideUp(function(){
$('#main').attr('src', $(this).attr('src'));
$(this).remove();
});
if this a homework please append homework tag.
I can't provide you with full HTML and javascript, but an idea. You have two blocks. Float the right block;
Left Block - 60%.
Right Block - 20% (float:right)
Define height for Right & Left block and give overflow:hidden for Right Block.
Now define a click function like this.
var nextAnimateImageId = 1;
$("#my_button").click(function{
jQuery("#my_image"+animateImageId).animate({height:'toggle'});
nextAnimateImageId = nextAnimateImageId + 1;
});
My idea is, if you have 5 images, only 3 will be shown becaue of defined height and overflow:hidden property. When you animate the first image to height=0 (which is what toggle does), the 4th image will come up due to the space freed up, giving you a nice scroll up animation.

How did they do those effects in http://artofflightmovie.com/?

I have been trying to understand how they did those effects in http://artofflightmovie.com/ with no success so far. I am not even sure what to google for for help. Could any one ellaborate on it and perhaps put links to plugins\tutorials\other websites doing the same thing?
There is already a similar question, but it didn't help me a bit ^^
Custom scroll bar behavior in Javascript?
All of the answers here so far are spot on and cover various pieces of the execution. Joseph's post about how we 'contained' and 'maneuvered' the site are dead-on, and those mentioning jQuery accurately depict our heavy reliance on it :)
With that said, the other concept of moving along a non-linear path was probably the most difficult part. We literally used an Illustrator file that was setup like a piece of graph paper and drew a bezier path that reflected the movement we wanted from the scrollbar. Then we 'downsampled' the path by converting the curved lines into a bunch of straight lines that represented the curve (similar to downsampling audio waveforms) to keep performance/speed high. We took those coordinates, gave them to our designer, and he created a gigantic design file and literally designed each content section at the designated 'stop' points. Next we mapped each coordinate along the path to a percentage value of the scroll position. We stored these values in a JavaScript array. Lastly we wrote some JS functions that we pipe the scroll position through to determine how to offset the positioning of the site 'container'. (It basically 'tweens' between each coordinate allowing us very fine/precise values at any given scroll percentage) The scroll functionality is handled by a tall div that basically sets our document height to force a scrollbar, and we just read it's position during a Scroll Event and slide the container around to where it should be using the above mentioned functions.
The parallax effect is achieved by applying a percentage of the position offset (what we use to move the container around) and applying it to the sub-containers of the various content sections. This makes the subcontainers move slower or faster than the background, but on the same motion path.
Lastly, the little snowboarders and helicopters (which have CSS3 rotations in addition to x,y movement in some browsers!) are positioned by using a simliar array of 'start' and 'end' positions and tweening between them based on the scroll percentage.
I'll leave it at that to keep this from turning into a book, but I'd be happy to elaborate on specifics if you're interested.
Full disclosure: I was lead developer on the site. I'm not posting to 'toot my own horn' or anything like that, just to be helpful and provide assistance to a fellow tinkerer. I come here a lot to dig through and get insight from others. (many, many thanks to those who have helped us!) Also, shameless plug, but the film is breath-taking... go rent it if you haven't yet, you won't be sorry. :)
That's a pretty cool website ;)
Basically using some javascript you can detect how far a person has scrolled. Considering the amount of scrolling you can move the contents of your webpage around if their position is absolute.
There are a couple of jQuery plugins that allow you to do simular stuff although I'm not sure you can "scroll through" a sequence of coordinates.
Here are a couple of jQuery plugins that helps you get simular effects:
http://johnpolacek.github.com/scrolldeck.js/
http://johnpolacek.github.com/scrollorama/
http://demos.flesler.com/jquery/scrollTo
http://webdev.stephband.info/parallax.html
I just picked a couple I'm familiar with but there are many plugins that are alike.
edit:
Decided to add some more simular websites for your pleasure.
http://www.activatedrinks.com
http://www.beetle.de
http://www.nikebetterworld.com
the whole page is an "overlay" - a full width and height wrapper <div>. sort of how modal windows do their "full page shadow" effect and have a small div float inside. the whole page content is in that wrapper. the scroll path is a script. the script captures the body scroll and moves the contents of the div accordingly to the positions provided by the script. with a body long enough to be scrollable (which cannot be seen since the wrapper covers the whole page), it's as if you are scrolling sideways, upwards etc.
an analogy is a modal window. the wrapper is the full-page shade. the modal window is the content. and notice how modal windows stick to the middle? that's using a script to calculate it's position to stay in the middle by moving the modal window down, relative to the page's top. but in that website's case, they move in different directions.
It doesn't seem too complicated.
Using the .scroll(function() {}) in jQuery you listen for a scroll event. When triggered you set the position style (left, top) of the content div to give the appearance of moving sideways instead of down.
I guess you'll need overflow:none property on the div to prevent users from scrolling over the area you don't want them to see.
Sounds like a lot of effort for a clunky user interface in my opinion.

why is this.offsetLeft 0?

I am working on a js player and the seek bar doesnt want to play nice. You can see two on pageload, they both work properly. Now click on either first or second div with the play img on it and a bar will appear. When you click there the bar is not precise. Its several pixels off.
this.offsetLeft is giving me 0 instead of 10 which breaks this. How do i fix it?
-edit- i still dont understand why but i decided to look again a min ago and deleted random css i pasted in. i deleted this single line and it worked. I am not sure what that block does but i know without that line it currently looks the same. player is not done yet so maybe i'll need this and revisit the question
position:relative;
The position:relative style is often used to make the element the "origin" for absolutely-positioned child elements. In other words, child elements with position:absolute calculate their positions from the relative parent's position. (instead of the window's) This way child elements follow the parent wherever it is placed.
Relative positioning also lets you use 'left', and 'top' to adjust the position of the element from its normally position.
The style can also be used to fix positioning and scrolling bugs in Internet Explorer.
It maybe too late for this issue but my experience can be useful here.
I had the same problem, i was getting 0, when i called getOffsetLeft() method.
you must add your widgets into container first and then call getOffsetLeft() method.

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