Smart way to enlarge image on hover - javascript

Is there a way to mimic this on have image event?
On hover image enlarges but it is done in smart way - it knows were browser window ends and all the times it manages to reposition enlarged image so it always shows full image.
Foto example of what I am talking about:

First assign a mouseover and mouseout event handler to the image class that sets a flag variable to true and false. On the mouseover event, get the img source then display that image in the viewing box. If the flag variable is true, then display the viewing box and adjust it's position according to the mouse's position. As far as deciding which side of the mouse to display the image on, I would recommend simply checking if the mouse is farther than half way across the x axis. You can do this by checking if event.clientX > window.innerWidth/2

Related

Get coordenates depending on responsive design

I'm creating a plugin that saves user mouse movements. I would like to create a kind of heatmap where the mouse goes. I don't know how to paint the coordinates in a responsive way. The elements are moving depending on device's width.
I thought that maybe I could create a function in JS that gets the userwidth, Xcoordenate, and Ycoordenate and returns the coordinates depending on the current screen. But, I would need to get (by javascript) which elements changes position from user width to current width. Is it possible? Any advice?
I would think that this is extremely difficult to do correctly.
You could try to store the mouse coordinates relative to the current element the mouse is moving over, but even that has its limits: When the page width changes the width and height, and even the content, of an element could change.
I think it would be better to only register over which element the mouse cursor is. Then it doesn't matter what shape an element has, or where it is.
See: Determine which element the mouse pointer is on top of in JavaScript

Trigger onMouseOver when mouse pointer already is over after page load

I have several pages that are all very similar. They have some javascript rollover links (images are preloaded, then there is a onMouseOver event that calls an image swap function and finally, there is a onMouseOut event that restores the original image).
When the user clicks on a rollover link that points to another page that has a rollover link on the exact same position, the image on the new page would be expected to load on the "over" state. This is not the case in Chrome and Safari (IE and Firefox work as expected).
So... On page load, is there a way to check if the mouse is already hovering the image to swap it right away? Something like "OnMouseAlreadyOver"?
Thank you.
If you using jQuery, it works without any problems!
http://jsfiddle.net/beuae
(not only for buttons, for divs also)
Actually, jQuery is a very good framework which assures everything goes as you expect, and cross-browser. This example confirms it.
The W3C standard says
onmouseover = script [CT]
The onmouseover event occurs when the pointing device is moved onto an element. This attribute may be used with most elements.
onmousemove = script [CT]
The onmousemove event occurs when the pointing device is moved while it is over an element. This attribute may be used with most elements.
mouseover is fired on moving over the boundary of the object. mousemove happens when the mouse is already over the element.
You may need to use onmousemove (or even both).
You may need to actually do the calculation based on the element position and the mouse cursor position.
//Get Mouse Position
document.onmousemove=getMouseCoordinates;
function getMouseCoordinates(event){
ev = event || window.event;
mouseX = ev.pageX;
mouseY = ev.pageY;
}
You can't without passing a variable to the other page or using cookies to track which was hovered (and that will fail over if people do change their mouse position)
In theory you could check the mouse position and the button position however there is no way to get the mouse position unless an event is triggered, so the mouse has to move and if it move the CSS :hover should get triggered.
It's a minor issue tho, I doubt most people are going to click a link, wait for the next page and then expect that link to be hovered and ready to click again (why wouldn't anyone one to keep clicking the same button unless it does different things)
From a UX point of view I wonder if webkit doesn't have the best approach here, why port the action of one page to another.
You can use document.getElementFromPoint(mouseX, mouseY) to get the element, but the only way to get the cursor's position is via an event. The problem is, the only events are clicks and mouse movements, which require user input from the beginning, which is what you're trying to avoid.
In short, no, it's not possible to do with JavaScript. You're left with using CSS.

JavaScript Click and Drag function

I'm trying to build an interactive map and I'm looking for information on how to have a click and drag in one window, affect an image in its parent window.
As this is hard to explain if you visit http://liamg.co.uk/map/map.html you will see a small window/map in the top left, Id like to be able to drag a small window around the map and have that move the larger/zoomed in image, does this make sense?
Any information/help is greatly appreciated!
jquery supports drag n drop elements, see here: http://jqueryui.com/demos/draggable/
you have to set the right boundaries, and then add an event that performs on drop in which you will read the position of the dropped element and can then apply it to the map however you want to.
The right example you want is this: http://jqueryui.com/demos/draggable/constrain-movement.html
The first one in the box has the boundaries of the box.
And here you see how to react on the drop: http://jqueryui.com/demos/draggable/events.html
I think what you need is not exactly a drag event, you want a element moving only inside the little map, yeah?
Let me explain:
1- Add a listener to mouse down, up and move to that little map;
2- When flag mousedown is true, mousemove works changing a position of a square div around the little map (showing what portion of image the user is seeing). Use pageX and Y (coordinates);
3- Make the math by size of the portion div and size of the big overflowed with the full map to show the exactly zoomed portion of the map.
I belive drag is really implemented when your move a think around all the document, or using the drop event. But it's what I think.

Move Mouse Cursor Javascript

I'm building a joke microsite for a company. They want a feature where the mouse cursor will randomly change position when the user hovers over a certain image.
Is this possible in Javascript? How would I implement it?
Thanks!
You can't... but you can - in a way.
What you can do to mimic this behavior is that you can hide the actual cursor with css cursor: none and then create an image representing the cursor which would look the same and would be placed in position of the real cursor. Then whe user would move the mouse you'd have to update the position of the cursor image and apply your random position changes as you wish - though be aware that when user will scroll outside of the browser content window (on the controls or outside the browser) they will get their mouse cursor back to real position and your cursor will be stuck in its last position.
The only way you could pull this prank out. Good luck with it and hope they'll enjoy it ;)
PS.
inverting the mouse movement direction can be funny as well :>
You can't move the mouse cursor.
You can move the page or the image relative to the position of the cursor, which might make it look like the cursor moved when it didn't?
You can change your cursor with invisible custom icon, and then make a fake cursor and move it.

Add another image on top of a drawn image on canvas, then have it respond to onclick event, is it possible?

Here's a canvas app I come across : canvasphoto (uses YUI 2 I believe, which I haven't used before). It displays images on a canvas and it lets you resize/move the images across the canvas. What I want to do is to add a close button on the top right side of the images drawn on the canvas and have it trigger an onclick event when clicked (I'd display a confirm button asking the user if he/she wants to remove the image).
Is this possible? If so, can you help me get started on this (resource/link for drawing an image on top of another image drawn on a canvas, basic canvas manipulation, etc.) Thanks!
Edit: solved the part where the image rendered will respond to click (on top right corner only). So, the only problem left is drawing the close button on the top right corner of the image.
There is no way for something drawn into a canvas to respond to events without additional work. Either you can store the position of the close box and have an onclick event on the canvas check if the click occurs within the rectangle, or you could place an element over the canvas where the rectangle has been drawn and use that to handle the click. A relatively positioned div with no contents would work.
Instead of drawing on the corkboard, a div with an image is rendered on the page above the top right corner of the image by setting a higher z-index than the canvas and and absolute position (with the coordinates of the top right corner, of course).

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