Develop Reference

Ext splitter - programmatically changing its position

I have a panel with 3 items in it. A panel then a horizontal splitter then a panel. This layout works fine and the user can easily drag the splitter up and down to resize the adjoining panels.
But how do I set the position of the splitter programmatically? Ideally I'd like to animate the splitter to its new position.
The splitter has a method setPosition, which also takes an animate argument. But this method simply moves the splitter without changing the heights of either panel. So the splitter is now floating over the top of one of the panels. In the afteranimate listener I've tried all manner of doLayout, updateLayout, panel.setHeight, etc... but nothing seems to affect the panel sizes. According to the console the code is run, it just doesn't appear to do anything.
So what is the method for changing the position of a horizontal position between two panels?
This is using Ext 4.1.1a.
splitter.setPosition(0,30,{
listeners:{
beforeanimate: function(){
console.log('animate');
},
afteranimate: function(){
console.log('finished');
bottomPanel.setHeight(500); //Does nothing
splitter.updateLayout(); //Does nothing
rightColumn.doLayout(); // Puts splitter bar back to the original position
}
}
});

I have solved a very similar problem with ExtJS 4.1.3. I have two panels separated by a vertical splitter and I wanted the splitter position to persist across page refreshes.
After trying for some time trying to hook into the splitter itself, I abandoned the idea. The way I have been able to set the splitter position programmatically starts by listening to the resize event of one of the panels.
I store the width of the sidebar with the ExtJS state manager. If the new width parameter is undefined, then this is a page reload situation and I grab the last saved sidebar panel width from the state manager. I set the width of the sidebar to the saved value, then set the splitter position to 20 pixels more than the width (to account I assume for the scrollbar.)
Inside the sidebar panel:
resize: function (sidebar, newWidth, newHeight, oldWidth, oldHeight) {
var sidebarWidth = newWidth;
if (oldWidth === undefined) {
// page reload. restore width from state manager
savedWidth = Ext.state.Manager.get('sidebar_width');
sidebarWidth = savedWidth === undefined ? sidebarWidth : savedWidth;
}
sidebar.splitter.setPosition(sidebarWidth + 20);
sidebar.setWidth(sidebarWidth);
Ext.state.Manager.set('sidebar_width', sidebarWidth);
}
I had avoided setting a listener inside a panel because I didn't know how to get a handle to the splitter object. The breakthrough came when I discovered that the context parameter sent into the resize event (named sidebar in the example code provided) holds a reference to the splitter object.
This solution worked for me and hopefully it will be helpful to others with this question.

JS / jQuery How to get height of dynamic (responsive) div?

I have not been able to find an answer that works for me on SO.
Basically I have a div with an image that has fixed positioning. It is responsive and will shrink or grow to whatever the screen size is.
What I want to do is get the height anytime the screen size changes and input it as a positioning value for another div so that it there is no overlapping (due to the fixed positioning).
I can get the height initially but it never changes after the first value when the screen is being resized.
quick demo up here: link
look in console to see height being returned. notice that it doesn't change when browser is resized.
JS
$(function(){
var explore = $('#explore').height();
console.log(explore);
$( window ).on("resize", function() {
console.log(explore);
});
});
I've also tried .css("height") but that didn't fix the issue.
*note the div does not have fixed positioning on this example since it would make the layout more confusing

You are not modifying explore:
Change it as follows:
$(function(){
var explore = $('#explore').css("height");
console.log(explore);
$( window ).on("resize", function() {
explore = $('#explore').css("height");
console.log(explore);
});
});

You need to add a resize listener to the window like so:
function repositionDivOnResize() {
// this is where you'll dynamically reposition your element
}
$(window).on("resize", repositionDivOnResize)

Calculating Height of Sidebar Dynamically

I'm trying to work out the algorithm for a fixed div that grows in height (while scrolling) until it's equal to the height of the viewport or div with fixed position relative to another div and the bottom of the viewport
I am using Twitter Bootstrap affix to lock my secondary navigation bar (yellow) and my sidebar (black) to the top of the screen when the user scrolls that far. 
This works fine. The sidebar is the piece that's giving me trouble.  When it is in its in its starting position (as shown in the diagram belorw), I want the top of the bar to sit 30px
down from the secondary navigation bar (yellow) and 30px up from the bottom of the page. 
As the user scrolls, the bar should grow in height so that it remains 30px beneath the secondary navigation bar and 30px above the bottom of the screen (As shown in the diagram below)
After the bar is fixed position, I am able to do what I need to do.  
.sidebar { 
position:fixed;
top:100px;  
bottom:30px;
left:30px;
}
What I can't figure out is how to position the TOP of the sidebar relative to my
secondary navigation bar and the BOTTOM of my sidebar relative to the bottom
of the screen. I've tried calculating the height of the sidebar at the beginning and the end of the
scroll but this causes issues.
I've also tried calculating the final height of the sidebar and letting the bottom of
the sidebar just run off the edge of the screen (when it's in its initial position), but
if there's not enough content on the right side to warrant scrolling, I have no way
of getting to the bottom items in the scroll bar.  Plus my screen starts bouncing
in a really un­attractive way.
below is the current code in use:
ShelvesSideBar.prototype._resize_sidebar = function(_this) {
var PADDING = 50;
var window_height = $(window).height(),
nav_bar_height = $('.nav_bar').height() + $('.secondary_tabs').height(),
sidebar_height = window_height - nav_bar_height - PADDING,
sidebar_scrollable_height = sidebar_height - $('.bar_top').height();
_this.$container.height(sidebar_height);
_this.$container.find('.bar_bottom').height(sidebar_scrollable_height);
/* reset the nanoscroller */
_this.$container.nanoScroller();
};
   
this code is called on page load and again on window resize. Any help would be greatly appreciated!

I've been trying to do something similar (minus the fixed elements and navbars). What I found was in order to do any sort of relative height scaling every element above the element I wished to scale all the way up to the opening html tags had to have a relative height set, even if it was just height:100%;. (here's my original question Variable height, scrollable div, contents floating)
My goal was to have the body height fixed to window size like a native full screen application would be with my content subareas scrolling, so this is a bit off topic for what you're wanting to accomplish. But I tried using JS/JQ to start off with as you're trying to do currently and found that I simply couldn't get the window height because the default behaviour for height management is to expand the page height until everything on the page fits. And all the getHeight methods I tried we're getting the page height not window/viewport height as promised. So you may wish to try fixing your body's height to the window and going from there using overflow:scroll; to scroll the page.
A quick note on overflow:scroll; if you have users who use WP8 IE (and probably other versions of IE) it may be advantageous to implement FTscroller to handle all your scroll elements as the overflow property defaults to hidden and is a fixed browser property. The only problem with FTscroller is because it uses CSS offsets to move the content container it may wreak havoc on elements that are designed to switched to fix when they reach x height from top of page because technically the top of page (or rather the top of the container they're in) isn't at the top of the page anymore it's beyond it. Just something to be aware of if you do need to cater for this browser.
And apologies for the complexity of my sentence structure. :/

so I was able to figure this out, for anyone still looking. What I ended up doing was binding to the window scroll event and - whenever the scroll occurred - I check if the class "affix" has been added to the sidebar. If it has, then I perform one set of calculations to determine sidebar height. Otherwise, I perform the other set of calculations. Code below:
/* called on window scroll */
var PADDING = 70;
var window_height = $(window).height(),
nav_bar_height = $('.nav_bar').height() + $('.secondary_tabs').height(),
header_height = $('.prof_block').height() - nav_bar_height,
sidebar_height = _this.$container.hasClass("affix") ? window_height - nav_bar_height - PADDING : window_height - (header_height + nav_bar_height) - PADDING,
sidebar_scrollable_height = sidebar_height - $('.bar_top').height();
_this.$container.height(sidebar_height);
_this.$container.find('.bar_bottom').height(sidebar_scrollable_height);

How to know when an element will be off screen?

I am writing a simple script that displays a dialog box when a user hovers over a profile picture. It dynamically determines the profile pics location on the page and then places itself to the left of it and about 100px above it. This part is working fine.
My issue arises when a profile pic is at the top of the screen and a user mouses over it. The dialog will appear but the top portion of it will be above the fold (i.e. not in the current browser window). Naturally this is not good usability and I would like it to appear on the screen.
My question is how do I know when a dialog will be off screen so I can recalculate its position on the page?
I saw this question which seems like the same as mine but unfortunately no actual solution was provided other then to link to a jQuery plugin. I am using Prototype.

Prototype already provides positions with Element.viewportOffset().
Edit, as Mathew points out document.viewport gives the rest of the information. For example,
var dialogtop = dialog.viewportOffset().top;
if (dialogtop < 0) {
// above top of screen
}
elseif (dialogtop + dialog.getHeight > document.viewport.getHeight()) {
// below bottom of screen
}

You'll want to find the profile pic's position relative to the document (here's a good article on how, though I suspect Prototype's Element.Offset already handles this), then compare it to the body's scrollTop property to see if it's close enough to the top that it needs to have its dialog repositioned.

I am familiar with this problem, however, last time I was able to use a library (Seadragon) to get the screen dimensions and mouse position. I was also working with a fixed size overlay so no code to share with you other than general approach.
For my pop up box I decided to use the event mouse position rather than location of the div on the page. I then compared the mouse position to the known screen size, which I determined on start or resize.
From How do I get the size of the browser window using Prototype.js?
var viewport = document.viewport.getDimensions(); // Gets the viewport as an object literal
var width = viewport.width; // Usable window width
var height = viewport.height; // Usable window height
In Prototype you can also get the mouse coordinates:
function getcords(e){
mouseX = Event.pointerX(e);
mouseY = Event.pointerY(e);
//for testing put the mouse cords in a div for testing purposes
$('debug').innerHTML = 'mouseX:' + mouseX + '-- mouseY:' + mouseY;
}
Source : http://remorse.nl/2008/06/mouse_coordinates_with_prototype/

Raphael canvas filling a container div

Instead of specifying the width and height of a Raphael canvas, I need it to be 100% the size of its container. So I could just do a Raphael("container", containerElement.width, containerElement.height) and set the onresize function to reset those values. But then the content gets very jumpy and hectic as I resize the window or container because the scrollbars (which I want if it gets too small) flash in and out of existence.
Is this the proper way to bind Raphael's canvas to the full size of a container? I'd also like to provide the option to make the Raphael canvas "full screen" taking up the entire browser window.

If you are using a div then you could use CSS to set that to 100% of the width and height. You then use the Raphael("container", "100%", "100%")
As for making it full screen, most browsers have a command to do this. So if you really are doing 100% then when you press the command button e.g. (F11 in firefox) it will become FULL screen.

Raphael("container", "100%", "100%"); will fill the canvas to width/height of the DIV container. This works fine in Chrome and Safari. To get Firefox on board you'll need to give body and html 100% width/height in the css, otherwise the vector will be clipped.

A little bit late on this one but I'll post here for other people searching.
var h = $('container').height(); //get the container height into variable h
var w = $('container').width(); //get the container width into variable w
//set your Raphael canvas to the variables
var contpaper = Raphael("container", w, h);
var doit;
//function to reload the page and/or do other adjustments
function resizedw(){
document.location.reload()
}
//call function 200 ms after resize is complete.
$(window).resize(function(){clearTimeout(doit);
doit = setTimeout(function() {
resizedw();
}, 200)});
This solution is cross browser and mobile safe so you can use this to incorporate responsive design. By adding caveats for viewport width or height to your javascript in the form of if statements, you can define all of your shapes based on the same variables.