Panning a background image in all directions on mouseover using Javascript - javascript

I am trying to add a panning effect to background image in a page, the image is quite large 1800 x 1067 ,so basically will be larger than the window
I want to pan the background in all directions when the mouse reaches the end of the window only ,
I found a Javascript code that does the panning, but only horizontally , tried playing around with it to enable vertical panning. didnt work.
here is the code on JSFiddle: http://jsfiddle.net/v662t/
// HTML
<div id="pageBg">
</div>
//CSS
#pageBg {
background: url(images/pageBg.jpg) no-repeat 0 0 scroll;
background-size: cover;
height: auto;
left: 0;
min-height: 768px;
min-width: 1024px;
overflow: hidden;
position: fixed;
top: 0;
width: 100%;
}
// Javascript
$(document).ready(function(){
$('#pageBg').mousemove(function(e){
var mousePosX = (e.pageX/$(window).width())*100;
$('#pageBg').css('background-position-x', mousePosX +'%');
});
});

remove background-size: cover and add a few javascript lines for mousePosY:
var mousePosY = (e.pageY/$(window).height())*100;
$('#pageBg').css('background-position-y', mousePosY +'%');
check out the working fiddle here: http://jsfiddle.net/georgedyer/XWnUA/2/

I'm answering the comment about panning at the edges here to include better formatting.
It depends on how exactly you want panning at the edges to work. Will the image move only if the mouse is moving over the edge, or even when the mouse is motionless but hovering over the edge?
In the first case: you can use the same fiddle code and just check to see if mousePosX or mousePosY are < 10 or > 90 (or whatever percentages you want to define as edges). If so, then instead of moving the image to a percentage of the window you'd move it to a percentage of the edge.
Since that may end up a little too sensitive, so you could go with the alternative of just moving on hover, in which case you'd use mouseEnter and mouseLeave events instead, and just start an interval on mouseEnter (using var interval = setInterval(moveImage,250);) that moves the background image a pixel, then clear that interval (clearInterval(interval);) on mouseLeave.
I'll leave it to you to edit the fiddle yourself and see if you can get it working how you want.

Related

Part of the block disappears after applying CSS scale

I would like to zoom in div by clicking on it, but part of this block is hidden after zoom.
Demo: http://jsbin.com/xumuzine/2/edit
CSS property transform-origin: 0 0; is not suitable, because in the future I will need to track the location where I clicked and increase it to this place.
Thanks.
UPD:
Okay, guys.
I may not accurately explained the problem.
http://jsbin.com/fecaduxidele/2/edit
Here i add click event handler that receives the coordinates of the click, and makes zoom to click position.
And if I click to cell with number 9 (for example), I can't scroll my grid to cell with number 1.
You could set the content size directly instead of scaling and use background-size to scale the image with it, e.g.:
#content {
width: 300px;
height: 300px;
background: url(http://placeimg.com/300/300/any);
background-size: 100%;
}
#content.scaled {
width: 450px;
height: 450px;
/* -webkit-transform: scale(1.5); */
-webkit-transition: all .5s ease-in-out;
}
Edit:
The above already fixes the issue of not being able to scroll to part of the image. You can handle the coordinate issue with a JQuery animation (you can't control scroll position from CSS), but it will not be smooth because it does not synchronize with the CSS animation. Your click handler would be something like:
var x = event.clientX,
y = event.clientY,
$this = $(this),
scaling = !$this.hasClass('scaled');
$this.toggleClass('scaled');
if (scaling) {
$this.parent().animate({
scrollLeft: x,
scrollTop: y
}, 500);
}
Here is the result applied to your second bin:
http://jsbin.com/jikididizice/1/edit
The issue was if the parent and the child is of same size its will show a scroller as you can see in this fiddle
JS Bin
as you can see in the above fiddle i have added scroll and the width and height is same as the parent in px so the scroller is coming
the fix is you can give 100% width and height like in the example i have shown below
if you dont want the scroller to come you can remove overflow:auto from the parent
JS Bin
you can also use transform-origin property to from where you want to scale the image like i have used center center in the example below so that it will scale from center
JS Bin
Few solutions:
Remove the overflow auto of the wrapper.
http://jsbin.com/xumuzine/40/
Scale the wrapper instead of the contents.
http://jsbin.com/mojoyapamuyi/1/
You should try with zoom property:
#content.scaled {
zoom:1.2;
}

how to add scrollbars to (a potentially infinite) canvas using fabric.js

I could be missing something here (I'm by no means an expert with HTML or CSS and have only just started using fabric).
It would seem that fabric is a nice tool for creating shape (object) based drawing applications but I can't figure out how to use it in such a way that a user can't lose objects by placing them off the canvas.
none of the demos have any functionality to prevent this but this seems like it would be a massive limitation to the framework. does anybody know of a way of solving this?
essentially, I want to allow users to arbitrarily add objects to the canvas and for usability, these objects will have to be spaced out and so the canvas will have to be potentially infinite. Obviously, the interaction area for the canvas will have to be of a fixed size.
Any help to get this sorted would be much apreciated
Adding to Benicks answer - you can call the canvas.on("object:moving", function(e) {}) which is triggered when an object is moved. So the wrapper will have the follwing css:
#wrapper{
position: absolute;
overflow: auto;
max-height: 600px;
max-width: 800px;
}
with an index file:
<div id="wrapper">
<canvas id="c2"></canvas>
</div>
To expand the canvas as an object is dragged to the edge of the wrapper you can do the following(done in coffee script):
canvas.on "object:moving", (e) ->
currentCanvasHeight = canvas.height
currentCanvasWidth = canvas.width
# e.target returns the selected canvas object
# Once the objects offset left value + the objects width is greater than the canvas
# width, expand the canvas width
if (e.target.left + e.target.currentWidth) > currentCanvasWidth
canvas.setWidth currentCanvasWidth + 50
$("#wrapper").scrollLeft e.target.left # scroll alongside the canvas expansion
$('#wrapper').on 'scroll', canvas.calcOffset.bind(canvas) # to fix the mouse
#position bug issue
# do the same for the top
if (e.target.top + e.target.currentHeight) > currentCanvasHeight
canvas.setHeight currentCanvasHeight + 50
$("#wrapper").scrollTop e.target.top
$('#wrapper').on 'scroll', canvas.calcOffset.bind(canvas)
we sort of had the same problem and solved by creating a viewport. We created a div around the canvas div.
<div id="viewport">
<div id="canvas"></div>
</div>
CSS:
#viewport {
height: 500px;
left: 0;
position: absolute;
top: 0;
width: 500px;
overflow: auto;
}
JS to create the canvas:
var canvas = new fabric.Canvas('canvas');
canvas.setWidth(1000);
canvas.setHeight(1000);
canvas.renderAll();
Now you should be able the scroll through the canvas. However you will realize that your mouseposition is not correct anymore. You can fix that using the canvas.calcOffset() method and bind it to the scroll event of the viewport for example.
Hope this helps.

Using SuperScrollorama to drop image in from top of page

I'm using SuperScrollorama to trigger a lot of animations on a single page (scrolling) website. All of the images and text that slide in from the left or right work perfectly. The problem is when I try to make an image drop in from the top of the screen the image will bounce up and down the whole time the user scrolls until they finally get down to the point where the image is supposed to "sit" (It basically goes back to it's original position and then down to where it's supposed to stay and then back up again and so on)... Here's my relevant code:
HTML:
<div id="about-pin-div">
<div id="pin-frame-pin" class="pin-frame"><img src="img/about-products.png" style="width: 55%;"></div>
</div>
CSS:
#about-pin-div { position: relative; width: 100%; height: 100%; left: -5%; overflow: hidden; }
.pin-frame { position: absolute; width: 100%; height: 100%; overflow: hidden; }
.pin-frame img { margin-top: -200px; }
JAVASCRIPT:
$(document).ready(function() {
var controller = $.superscrollorama();
controller.addTween('#about-pin-div', TweenMax.from( $('#about-pin-div'), .5, {css:{bottom:'1000px'}, ease:Quad.easeInOut}), 0, 600);
// set duration, in pixels scrolled, for pinned element
var pinDur = 1000;
// create animation timeline for pinned element
var pinAnimations = new TimelineLite();
pinAnimations
.append(TweenMax.from($('#pin-frame-pin img'), .5, {css:{marginTop:80}}))
// pin element, use onPin and onUnpin to adjust the height of the element
controller.pin($('#about-pin-div'), pinDur, {
anim:pinAnimations,
onPin: function() {
$('#about-pin-div').css('height','100%');
},
onUnpin: function() {
$('#about-pin-div').css('height','100%');
}
});
});
Thanks in advance for any help!
I think you are having a number of issues here and I will try to point out some problems that I have had with this plugin.
(1) When in doubt turn off pushFollowers for your pins.
In an effort not to continue to repeat myself
Play through pinned elements in superscrollorama
janpaepke did an excellent job in writing this work around because he had the same issues himself.
(2) Never use margins for adjusting the position, IE handles margins badly sometimes depending on the context won't work the way you want it to.
When to use margin vs padding in CSS
Does a better job at explaining it then I can.
(3) I don't understand the need to trigger on pin functions to adjust the height of #about-pin-div. You are just resetting the starting value over and over that I don't see ever gets changed. Unless you were trying to compensate for the automatically adjusting of pinned elements but the work around in (1) should fix that.

Elements misposition at resize (using max-width:100% to scale rel. to window size)

I am using max-width: 100%; height: auto; on all my <img> elements and on my image slider wrapper.
When resizing the browser window, the images scale correctly, but many surrounding elements don't follow along and misposition. They will self-correct once the page is refreshed or next image is loaded in the image slider. Any ideas?
Demo - scale the window, css at line 25
Pikachoose library sets the sizes of a few elements on each animation.
<div class="pika-stage" style="height: 355px;">
<div class="pika-aniwrap" style="position: absolute; top: 0px; left: 0px; width: 835px;">
This is why everything fixes itself when the next animation happens. You could look though the source and replicate the animations re-sizing code and put it in a $(window).resize event handler. Looking at the docs for Pikachoose it seems that they have a goto method.
You could do something like this:
$(window).resize(function(){$('#pikame').data('pikachoose').GoTo(3)})
Where the index of 3 is the current active slide. You probably want to use a form of timeout and only call it once to improve performance.
var resizeSlider = null
$(window).resize(function(){
if(resizeSlider) clearTimeout(resizeSlider)
resizeSlider = setTimeout(function() {
$('#pikame').data('pikachoose').GoTo(3)
}, 300)
})
This should make it so the goto is fired 300ms after the last window.resize event.
Hope this gives you some ideas.

Dynamic Background Scrolling

Here's a link to what I'll be referring to.
I'm having some trouble getting the background image to work the way I'd like it to.
I want the background to auto resize based on the width of the window, which it is already doing correctly. If you make your window smaller you'll see the background shrink with it.
Here's the issue. If you make your window wide (short) then the background will resize and go too high so you can't see the top of the background anymore (since the background is bottom positioned).
I want the background to be top position when you are at the top of the page, and as you scroll down it will slowly move to be bottom positioned. Sort of like the effect of an Android phone's background when you move left and right. Of course, keep in mind that I still want the background to auto-resize when you make the window smaller.
html {
background-color: #70d4e3;
height: 100%;
}
body {
height: 100%;
}
.background {
margin-top: 45px;
width: 100%;
position: fixed;
bottom: 0;
left: 0;
z-index: -9999;
}
.banner {
margin: 0px auto;
width: 991px;
margin-bottom: -9px;
}
.content {
background: url("http://i.imgur.com/daRJl.png") no-repeat scroll center center transparent;
height: 889px;
margin: 0 auto;
width: 869px;
}
.innerContent {
padding: 30px;
}
<img src="http://i.imgur.com/6d5Cm.jpg" alt="" class="background" />
<div class="banner">
<img src="http://i.imgur.com/JptsZ.jpg" alt="" />
</div>
<div class="content">
<div class="innerContent">
testing
</div>
</div>
Maybe some javascript or jquery would be needed to achieve this.
Well, this was fun, thanks!
I hope you don't mind me taking the liberty to use percentages to make my life a little bit easier and possibly the script slightly more robust since I can reliably use floats with percentages.
What I did is make the layout, html and css comply with the rules you need for the bg to be animated properly, they stayed largely the same from what you had.
Then it was just a question of figuring out the calculations needed with the right properties to figure out the percentage you were from the top, the *20 is actually the amount of space 'left' to fill by the background image in percentages (as the background height is 80%).
They I moved the calculations to a function so I could call that on scroll and on window resize, making sure it's initiated on any event that modifies the window somehow...
Didn't do extensive testing but it worked in Chrome and I'm tired :p
I believe this is what you are looking for:
http://jsfiddle.net/sg3s/RSqrw/15/ See edit 2
If you wanted this the other way arround just make the page background start at the top and modify that:
http://jsfiddle.net/sg3s/RSqrw/14/ See edit 2
Edit:
As a bonus, and since I had never actually written jquery script as a 'plugin', I decided to convert this into one. What I came up with should be easy to implement and use!
http://jsfiddle.net/sg3s/RSqrw/52/ See Edit 3
Functionality successfully tested in Chrome, Firefox 3.6, IE9 + compatibility mode
Edit 2:
Reading the question again checking if I did it right I noticed I didn't quite do what you want, so I updated the link in the first edit which gives you a plugin in which you can have several options for the scrolling background. It retains my 'old' interpetation while also doing what you want... Read comments in code for some extra descriptions.
Edit 3:
As I went to work today I was bothered with the fact that my plugin 'try' was a little bloated. And as you mentioned in the comment it didn't quite fit the requirements.
So I rewrote it to only do what you want and not much more, tested in Chrome Firefox, IE9 +compat etc etc.. This script is a lot cleaner.
http://jsfiddle.net/sg3s/vZxHW/
You can chose to make the background stick to the top or bottom if the height fits in the window. Nothing else, but that is already more than enough to do some pretty cool stuff :p
An exact solution: Fiddle: http://jsfiddle.net/srGHE/2/show/
View source
Thanks for the challenge. See below for the solution, which is complying with all requirements, including recommended yet optional (with steps on how to remove these) features. I only show the changed parts of your page, with an explanation after each section (CSS, HTML and JavaScript):
CSS (changes):
html,body{
margin: 0;
height: 100%;
padding: 0;
}
body{
background-color: #70d4e3;
}
#background { /*Previously: .background*/
/*Removed: margin-top: 45px;
No other changes*/
}
#banner /*Previously: .banner; no other changes */
#content /*Previously: .content; no other changes */
#innerContent /*Previously: .innerContent; no other changes */
Explanation of CSS revisions:
margin-top:45px at the background is unnecessary, since you're absolutely positioning the element.
All of the elements which are unlikely to appear more than once should be selected via the id (#) selector. This selector is more specific than the class selector.
HTML (changes):
All of the class attributes have been replaced by id. No other changes have been made. Don't forget to include the JQuery framework, because I've implemented your wishes using JQuery.
JavaScript (new):
Note: I have added a feature which you didn't request, but seems logical. The code will automatically reserve sufficient margin at the left side of the window in order to always display the background. Remove anything between the marked comments if you don't want this feature.
$(document).ready(function(){
//"Static" variables
var background = $("#background");
var marginTop = parseFloat(background.css("margin-top")) || 0;
var bannerWidth = $("#banner").width(); /*Part of auto left-margin */
var extraContWidth = (bannerWidth - $("#content").width())/2; /*Same as above*/
function fixBG(){
var bodyWidth = $("body").width();
var body_bg_width_ratio = bodyWidth/1920;
var bgHeight = body_bg_width_ratio * 926; //Calcs the visible height of BG
var height = $(document).height();
var docHeight = $(window).height();
var difHeight = bgHeight - docHeight;
var scrollDif = $(document).scrollTop() / (height - docHeight) || 0;
/*Start of automatic left-margin*/
var arrowWidth = body_bg_width_ratio * 115; //Arrow width
if(bodyWidth - bannerWidth > arrowWidth*2){
$("body > div").css("margin-left", "auto");
} else {
$("body > #banner").css("margin-left", arrowWidth+"px");
$("body > #content").css("margin-left", (arrowWidth+extraContWidth)+"px");
}
/*End of automatic left-margin*/
if(difHeight > 0){
background.css({top:(-scrollDif*difHeight-marginTop)+"px", bottom:""});
} else {
background.css({top:"", bottom:"0"});
}
}
$(window).resize(fixBG);
$(window).scroll(fixBG);
fixBG();
});
Explanation of the JavaScript code
The size of the background is determined by calculating the ratio of the background and document width. The width property is used, because it's the most reliable method for the calculation.
Then, the height of the viewport, document body and background is calculated. If applicable, the scrolling offset is also calculated, to prepare the movement of the background, if necessary.
Optionally, the code determines whether it's necessary to adjust the left margin (to keep the background visible at a narrow window).
Finally, if the background arrow has a greater height than the document's body, the background is moved accordingly, taking the scrolling position into account. The arrow starts at the top of the document, and will move up as the user scrolls (so that the bottom side of the arrow will be the bottom of the page when the user has fully scrolled down). If it's unnecessary to move the background, because it already suits well, the background will be positioned at the bottom of the page.
When the page has finished loading, this functionality is added to the Resize and scroll events, so that the background is always at the right location.
If you've got any other questions, feel free to ask them.
well, I'm not sure if I understand you and why do you want to do that, but you can try adding 2 backgrounds (see http://www.css3.info/preview/multiple-backgrounds/ ), one with the top bg and another with the bottom bg but I think that if the page is not too long it will cause issues, so the other answer with pure CSS is as follows: first add 3 horizontal divs with 100% width. Top div will have your top bg and its height, middle div will be transparent and auto height and bottom div will have your bottom bg and its height. All divs will have a 0 z-index. Then create a higher z-index div to act as a container and you'll be set. If I understand your question right, that's the close I can think of to achieve that. This being said, I'm pretty sure you can do this with JQuery with way better results
Using jQuery I was able to give you what I think you're asking for:
$(window).scroll(function() {
var h = Math.max($(document).height(), $(window).height());
var bottom = h - $(".background").height() - $(window).height();
$(".background").css("top", (($(window).scrollTop() / h) * bottom) + "px");
});
EDIT: Forgot to account for the way scrollTop reports position.
Or maybe:
.background {
margin-top: 45px;
max-width: 100%;
position: fixed;
bottom: 0;
left: 0;
z-index: -9999;
max-height: 100%;
}
I reccomend using jQuery Background Parallax
http://www.stevefenton.co.uk/Content/Jquery-Background-Parallax/
The function is as simple as
$("body").backgroundparallax();
Ask if you don't get it to work.
#abney; as i understand your question may that's you want http://jsfiddle.net/sandeep/RSqrw/60/
you need only css for this:
#background {
position: fixed;
width: 100%;
height:100%;
top: 0;
left:0;
z-index: -1;
}
The solution to your issue is a nice little lightweight plugin by Scott Robin. You can get more info, download it, and make your life easier for all of your projects by visiting his project page here.

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