html zoom on mouse over - javascript

I want to have a photo in a site, and when I mouse over, I want a little magnifier zoom effect.
Can I do this in html with canvas or something? javascript maybe?
thank you

Enclose your photo in a div and add Zoom via CSS on hover. You may want to increase the z-index upon hover. You can add to the below CSS to make the zoomed photo look/style better. If you don't want to reinvent the wheel, look out for some Jquery plugin which may accomplish the same thing in an elegant manner with less effort.
CSS:
#div-1 {
position: absolute;
}
#div-1.hover {
position: absolute; zoom: 70%; border: solid 1px; z-index:10;
}
Jquery/Javascript:
<script type = "text/javascript">
$(document).ready(function() {
$(".div-1").onmouseover(function() {
toggle_visibility('div-1');
})
function toggle_visibility(id) {
var e = document.getElementById(id);
if ($(e).hasClass("hover")) {
$(e).removeClass("hover");
} else {
$($(e)).addClass("hover");
$($(e)).attr({
width: "100%",
height: "100%"
});
}
}}); < /script>

Canvas isn't supported by IE without third-party plug-ins. You'll want to do this in JavaScript. jQuery makes this very easy and clean. Bind handlers for the hover in / out events for the image element you want to zoom using .hover(). "Binding handlers" simply means you pass two functions to .hover() which will be executed when the user hovers in and out, respectively. These functions will use animate(), which you can simply pass a new size.
Have a look at the documentation for .animate() and .hover(). If you're totally new to jQuery, check out the tutorials.

You can show the image in a div as a background-image and change the position with a little javascript.
Here's a library with some examples: http://www.mind-projects.it/projects/jqzoom/demos.php

Related

html div not allowed to go off page

First off, let me give you a little background. I am creating a responsive page using % for positioning my divs. It allows the user to drag and drop items wherever they please. The issue arises when the user places the object to near the edge of the page. When you resize the browser the images start to go off the page and get cut off.
#div1
{
overflow: hidden;
right: <?php variable>;
bottom: <?php variable>;
}
#div2
{
overflow: hidden;
left: <?php variable>;
top: <?php variable>;
}
What I would like to try and do is allow the percentage's to control the placement up until the edge of the page. Then I would like to hardcode the variables to something like 10px so it never goes of the page.
I thought of doing this in javascript(if statement('s)), but thought maybe there was a simpler way(css properties). Any help or suggestions would be greatly appreciated.
Thanks,
Rob
If you are going to use javascript you need to have a separate function that triggers on browser resize:
window.onresize = function(event) {
//your code here
}
or if you are using the popular jQuery
$(window).resize(function(){
//your code here
});
is the same.
If you want to hardcode it with css use a #media query:
#media(max-width:767px) { /*or whatever you want to use to trigger the css that will be used after browser size fits your problem */
.myImage {left:10px;top:10px;}
}
More info on what you can use with #media can be found here http://www.w3.org/TR/css3-mediaqueries/
If you ask me I think that you will accomplish a much more solid solution using javascript and since I suspect you are using js to drag elements around just go with it for resizing and repositioning too.

Interactive HTML webpage

EDIT: Thanks for a lot of great examples on how to solve these. I cant decide between who to accept yet, but I will go though all examples and see which I like the most. Great feedback guys! =D
I normally do these kind of things in flash, but this time it has to be compatible with mac, iPads and all those units too.
So, what do I need help with?
I've got a picture, with some "hotspots" on. I want to be able to click any of those hotspots to show some information.
This should be fairly basic and easy to achieve, but since I've never done this in html before I have to ask you guys =)
So, what would be the best way to do this? It have to be compatible with any browser and device, and it doesnt need to be very advanced. If it's possible to add effects to the box (sliding out, fading in, or anything like that) then thats a nice bonus, but not something I need.
Any help would be great!
BREAKDOWN:
I have a background image with some "hotspots" (numbers 1 and 2 in my example). The users should be able to either hover the mouse over any of these or click it to get more information, as seen in picture #2
This is that happens when you hover/click any of these hotspots.
Text and image is displayed inside a nice little info box.
If the user clicks "more information" it will open up even further to display more information if available. Like in this img:
I don't think the Javascript approach is really necessary here. I created a little CSS-only mock-up for you on JSBin.
Basically the point is that you enclose the image in a relatively positioned div, then absolute position the hotspots inside the same div. Inside the hotspots divs you will have the more info elements, showing only on :hover of their parents.
This makes it simple, and far more accessible.
Update: cropping the image equally from both sides
If you want to keep the image centered and still not use any javascript, you could set the required image as a background-image of the container, and setting its background-position parameters to center center.
You would have to make sure that the width of this div is set to the width of your image, and the max-width to 100%, so that when the window gets resized below the image width it stays at the center.
Now, a problem that I encountered here is how to make the hotspots stay center relatively to the image. I solved it this way:
I created a wrapper div for the hotspots with these characteristics:
margin: 0 auto;
position: relative;
width: 0px;
This basically makes sure that the wrapper div finds the center of our image. Then, you would position the hotspots relatively to the top-center position of the image, instead of the top-left as a starting point.
Then you have what you are looking for.
Working demo
Here's another approach, and in my opinion far superior to using a map or excessive JS. Place <div> elements on top of the element with the background-image and have HTML and CSS do the heavy lifting for you.
See it on JSFiddle
HTML
The HTML should seem pretty each enough to understand, we create <div>s with the class hotspot and rely on certain things being present. Namely .text (to show digit), .hover-popup (to show on hover) and .click-popup (which is inside .hover-popup and is shown when clicked).
<div id="hotspot1" class="hotspot">
<div class="text">1</div>
<div class="hover-popup">
I was hovered!
<div class="click-popup">
I was clicked on!
</div>
</div>
</div>
<div id="hotspot2" class="hotspot">
<div class="text">2</div>
<div class="hover-popup">
I was hovered!
<div class="click-popup">
I was clicked on!
</div>
</div>
</div>
CSS
This is where most of the magic happens, see the comments for further explanation.
/* These two position each hotspot */
#hotspot1 {
left:15%; /* we could use px or position right or bottom also */
top:20%;
}
#hotspot2 {
left:35%;
top:25%;
}
/* General styles on the hotspot */
.hotspot {
border-radius:50%;
width:40px;
height:40px;
line-height:40px;
text-align:center;
background-color:#CCC;
position:absolute;
}
.hotspot .text {
width:40px;
height:40px;
}
/* Show the pointer on hover to signify a click event */
.hotspot .text:hover {
cursor:pointer;
}
/* hide them by default and bring them to the front */
.hover-popup,
.click-popup {
display:none;
z-index:1;
}
/* show when clicked */
.hotspot.clicked .click-popup {
display:block;
}
/* show and position when clicked */
.hotspot:hover .hover-popup {
display:block;
position:absolute;
left:100%;
top:0;
width:300px;
background-color:#BBB;
border:1px solid #000;
}
JavaScript (with jQuery)
Unfortunately you're going to have to use some JavaScript for the clicking part as CSS doesn't have a 'clicked' state (outside of hacks with checkboxes). I'm using jQuery because it's dead easy to do what I want.
$(document).ready(function () {
$('.hotspot').click(function () {
$(this).toggleClass('clicked');
});
});
Creating the arrow
Over at css-tricks you can find a tutorial for attaching an arrow to a element using the :before and/or :after pseudo-elements. You can even 'simulate' a border around them by placing the :after element on top of the :before. But yea, lots of resources on how to do this.
You should be able to use the onclick or OnMouseOver event in the map area (define the href as "").
An example using OnMouseOver is here: http://www.omegagrafix.com/mouseover/mousimap.html
Give a class for that image in html (Ex: imgclass). And in javascript(using jquery), build that hover box in html format and bind it to 'mouseover' event of that image.
For example:
function bindhtmltoimage() {
myimg = $('body').find('.imgclass');
divSlot.each(function (index) {
$(this).bind('mouseover', function () {
try {
//position the hover box on image. you can customize the y and x axis to place it left or right.
var x = $(this).offset().left;
var y = $(this).offset().top;
var position = $(window).height() - ($("#divHover").height() + y);
var widthposition = $(window).width() - ($("#divHover").width() + x);
if (position < 0 || widthposition < 0) {
if (position < 0) {
$("#divHover").css({
position: 'absolute',
left: x + 20,
top: y - $("#divHover").height() - 20
});
}
if (widthposition < 0) {
$("#divHover").css({
position: 'absolute',
left: x - $("#divHover").width(),
top: y + 20
});
}
}
//build your html string for that hover box and apply to it.
$('#divHover').html("your Html content for that box goes here");
$('#divHover').show();
//if you want the box dynamically generated. create the html content and append to the dom.
}
catch (e) {
alert(e)
}
});
});
}
it will work fine in desktop and mobile. if you face any problem in touch devices, bind the function to click event instead of 'mouseover'.
Also, for map approach, i strongly recommend SVG instead of images.

changing element.style on the finishing position of a jQuery animated div

I am using a photo album jQuery plugin (Supersized). It includes a thumbnail tray which slides up from the bottom of the screen at the touch of a button, resulting in the following HTML being created onto the div properties and in firebug css 'element.style. property:
style="display: block; bottom: -150px;"
and when caller clicked:
style="display: block; bottom: 0px;"
I am trying to place a footer div at the bottom of the page though, so want to move the finishing position to 'bottom:0px'. I have seen that an extra element.style can be added to local CSS but without a 'before' and 'after' type of selection I don't understand if that can help me. Furthermore I don't find the function in the JS files and from what I understand it can't be accessed anyway. I need to change these to be:
style="display: block; bottom: -150px;"
and when caller clicked:
style="display: block; bottom: 42px;"
Any advice would be most welcome. Thanks
$('#clickedElement').on('click', function() {
$('#element').css('bottom', '42px')
});
If i didn't missunderstand you?
Probably the function which you can not find is jquery .css() function you can read how it works here.
Also if you want to animate some dive you can use jquery .animate() function (docs).
In your case it should looks like:
$('#button').click(function() {
$('#element').animate({
$('#element').css('bottom', '42px');
}, 5000, function() {
});
});
Where 5000 it's time of your animation in miliseconds.

Event when the user changes font size in browser?

I need to get informed when the user changes the font size in it's browser.
I need it to reposition some elements which have to be relative in one dimension to an anchor inside a text.
So far i haven't found anything and i'm a bit worried that it's not possible. In this case it should be possible to emulate it with a hidden div and some text inside and a script polling for changes of it's width. But i hope someone has a more elegant solution.
EDIT:
I implemented the polling thing like following. It's not properly tested on all Browsers but it doesn't depend on browser specific features. use it like $('body').bind('fontResize', function(){...})
$(function(){
$('body').append($('<div id="theFontResizeCaptureDiv">A<br>B<br>C</div>'));
$('#theFontResizeCaptureDiv').css({visibility: 'hidden', position: 'absolute'});
window.setInterval(function(){
var div = $('#theFontResizeCaptureDiv');
var stored = parseInt(div.attr('c_height'));
if(isNaN(stored)){ // first run
div.attr('c_height', div.innerHeight());
}else if(stored != div.innerHeight()){ // changed
div.attr('c_height', div.innerHeight());
$('body').trigger('fontResize');
}
}, 200);
});
Here's a link to an article describing different methods to detect font resizing:
http://www.alistapart.com/articles/fontresizing/
You can use idea from this file https://github.com/marcj/css-element-queries/blob/master/src/ResizeSensor.js
I've incorported it in jQuery Terminal as jQuery plugin and use div with and css:
.font {
position: absolute;
font-size: inherit;
top: 0;
left: 0;
width: 1em;
height: 1em;
}
that way if parent element, that have position: relative or absolute, change font-size the .font element will change size and trigger resizer callback.
You can use this plugin like this:
var font = $('<div class="font"> </div>').appendTo(self);
font.resizer(function() {
// font changed size
});
where self is your parent element, if you need to detect this event on body you can use 'body' instead.

How can I have my links display a little transparent box on a:hover?

I'd like to display a little tooltip similar to this:
That little black box appears when I put my mouse over it. How can I achieve this? Is it using jQuery or MooTools or what?
Thanks from this beginnig web designer!
I think you can do it with CSS, no need for Javascript.
The black box (the tooltip) can be an absolutely positioned child with display: none by default, and on :hover you can show it.
Here is a little demo.
Example CSS:
.tooltipped { position: relative; }
.tooltip { display: none; position: absolute; width: 100%; left: 0; top: 35px; }
.tooltipped:hover .tooltip { display: block; }
for the HTML (which remains readable without CSS!):
<div class="tooltipped">3 <span class="tooltip">acorns remaining</span></div>​
This method will work in every modern browser and IE >= 7. IE6 only supports the :hover selector on links, so you need to use an a element if you want to support it (or find a different workaround).
This is done through JavaScript. I would recommend using the jQuery framework, as there are a load of different jQuery Tool Tip plug-ins ready for you to use.
For example.
Definitely looks like Tipsy, a jQuery plugin I used.
With jQuery, assuming you had a div properly formatted like thus: (notice this is an extremely simple example. I'm not defining the classes to properly format the elements or anything like that)
3
and
<div class="onmouseoverpopup parent">
<div class="onmouesoverpopup arrowontopmiddle"></div>
<div class="onmouesoverpopup text">Acorns remaining</div>
</div>
You might do something like this
$(document).ready( function() {
$(".acornsremaining").hover( function() {
$(".onmouseoverpopup.parent").show();
}, function() {
$(".onmouseoverpopup.parent").hide();
});
});

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