Develop Reference

Attribute in Background Image url

First look at my code:
IMAGE:
<img class="small" src="http://thecodeplayer.com/uploads/media/iphone.jpg" width="200"/>
BACKGROUND URL:
<div class="small" style="background-image: url('http://thecodeplayer.com/uploads/media/iphone.jpg')" ></div>
In the IMAGE I can use an attribute src in jquery
attr("src");
But how can I do it to in a background Image URL? I made this code and added an attribute but it's not working, any ideas?
<div class="small" style="background-image: url(attr(data-image-src='http://thecodeplayer.com/uploads/media/iphone.jpg')" ></div>
attr("data-image-src");
Now the reason why I want this to happen is that if you will look in this CodePen:
codepen
The sample code is an image and they used an attr(src) in jquery code, but I want it to be a background image URL, not an image.

To get the background-image in jQuery you can use:
var urlFull = $('.small').css('background-image');
//You will get the full value here
url = urlFull.split('"');
//But for using it properly you have to split it and get the url with `"` which will be holding the url.
console.log(url[1]); //You will get URL here
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="small" style="background-image: url('http://thecodeplayer.com/uploads/media/iphone.jpg')"></div>
Now for your real issue:
$(document).ready(function() {
var native_width = 0;
var native_height = 0;
var urlFull = $('.small').css('background-image');
//You will get the full value here
url = urlFull.split('"');
//But for using it properly you have to split it and get the url with `"` which will be holding the url.
//console.log(urlFull);
$(".large").css("background-image", urlFull);
//Now the mousemove function
$(".magnify").mousemove(function(e) {
//When the user hovers on the image, the script will first calculate
//the native dimensions if they don't exist. Only after the native dimensions
//are available, the script will show the zoomed version.
if (!native_width && !native_height) {
//This will create a new image object with the same image as that in .small
//We cannot directly get the dimensions from .small because of the
//width specified to 200px in the html. To get the actual dimensions we have
//created this image object.
var image_object = new Image();
image_object.src = url[1];
//This code is wrapped in the .load function which is important.
//width and height of the object would return 0 if accessed before
//the image gets loaded.
native_width = image_object.width;
native_height = image_object.height;
} else {
//x/y coordinates of the mouse
//This is the position of .magnify with respect to the document.
var magnify_offset = $(this).offset();
//We will deduct the positions of .magnify from the mouse positions with
//respect to the document to get the mouse positions with respect to the
//container(.magnify)
var mx = e.pageX - magnify_offset.left;
var my = e.pageY - magnify_offset.top;
//Finally the code to fade out the glass if the mouse is outside the container
if (mx < $(this).width() && my < $(this).height() && mx > 0 && my > 0) {
$(".large").fadeIn(100);
} else {
$(".large").fadeOut(100);
}
if ($(".large").is(":visible")) {
//The background position of .large will be changed according to the position
//of the mouse over the .small image. So we will get the ratio of the pixel
//under the mouse pointer with respect to the image and use that to position the
//large image inside the magnifying glass
var rx = Math.round(mx / $(".small").width() * native_width - $(".large").width() / 2) * -1;
var ry = Math.round(my / $(".small").height() * native_height - $(".large").height() / 2) * -1;
var bgp = rx + "px " + ry + "px";
//Time to move the magnifying glass with the mouse
var px = mx - $(".large").width() / 2;
var py = my - $(".large").height() / 2;
//Now the glass moves with the mouse
//The logic is to deduct half of the glass's width and height from the
//mouse coordinates to place it with its center at the mouse coordinates
//If you hover on the image now, you should see the magnifying glass in action
$(".large").css({
left: px,
top: py,
backgroundPosition: bgp
});
}
}
})
})
/*Some CSS*/
* {
margin: 0;
padding: 0;
text-align: center
}
.magnify {
width: 200px;
margin: 50px auto;
position: relative;
cursor: none;
display: inline-block;
}
/*Lets create the magnifying glass*/
.large {
width: 175px;
height: 175px;
position: absolute;
border-radius: 100%;
/*Multiple box shadows to achieve the glass effect*/
box-shadow: 0 0 0 7px rgba(255, 255, 255, 0.85), 0 0 7px 7px rgba(0, 0, 0, 0.25), inset 0 0 40px 2px rgba(0, 0, 0, 0.25);
/*hide the glass by default*/
display: none;
background-repeat: no-repeat;
}
/*To solve overlap bug at the edges during magnification*/
.small {
display: block;
width: 200px;
height: 400px;
float: left;
background-size: contain;
background-repeat: no-repeat;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Lets make a simple image magnifier -->
<div class="magnify">
<!-- This is the magnifying glass which will contain the original/large version -->
<div class="large"></div>
<!-- This is the small image -->
<div class="small" style="background-image:url('http://thecodeplayer.com/uploads/media/iphone.jpg')" width="200" />
</div>
</div>
Codepen if you want.
I hope this woks for you.

I think you have missed a Single quote in your attribute.
Change
<div class="small" style="background-image: url(http://thecodeplayer.com/uploads/media/iphone.jpg')" ></div>
to
<div class="small" style="background-image: url('http://thecodeplayer.com/uploads/media/iphone.jpg')" ></div>
Hope this helps.

First you have to set '' to url
<div class="small" style="background-image: url('http://thecodeplayer.com/uploads/media/iphone.jpg')" ></div>
To get url of background-image:
var url=$('.small').attr('src')
$('.large').css('background-image',"url('"+ url + "')");
.large{
background-repeat: no-repeat;
width: 175px;
height: 175px;
background-size: cover;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<img class="small" src="http://thecodeplayer.com/uploads/media/iphone.jpg" width="200"/>
<div class="large"></div>

How do you create 3 adjustable divs?

What I want:
| A | | B | | C |
^ ^
When you move the handles left and right A, B, and C resize accordingly
| A | | B | | C |
What I have is the || between B and C sliding, but not resizing B and all I get on the other one is the resize cursor. Basically C is a curtain and covers A and B. I did get min size working for C.
| A | C |
I broke somebody else's perfectly good code to get this far:
var isResizing = false,
who='',
lastDownX = 0;
$(function () {
var container = $('#container'),
left = $('#left'),
right = $('#right'),
middle = $('#middle'),
hand2 = $('#hand2'),
handle = $('#handle');
handle.on('mousedown', function (e) {
isResizing = true;
who=e.target.id;
lastDownX = e.clientX;
});
$(document).on('mousemove', function (e) {
var temp, min;
// we don't want to do anything if we aren't resizing.
if (!isResizing)
return;
min=container.width() * 0.1;
temp = container.width() - (e.clientX - container.offset().left);
if (temp < min)
temp = min;
if (who == 'handle')
right.css('width', temp);
if (who == 'hand2')
left.css('width', temp);
}).on('mouseup', function (e) {
// stop resizing
isResizing = false;
});
});
body, html {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
#container {
width: 100%;
height: 100%;
/* Disable selection so it doesn't get annoying when dragging. */
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: moz-none;
-ms-user-select: none;
user-select: none;
}
#container #left {
width: 40%;
height: 100%;
float: left;
background: red;
}
#container #middle {
margin-left: 40%;
height: 100%;
background: green;
}
#container #right {
position: absolute;
right: 0;
top: 0;
bottom: 0;
width: 200px;
background: rgba(0, 0, 255, 0.90);
}
#container #handle {
position: absolute;
left: -4px;
top: 0;
bottom: 0;
width: 80px;
cursor: w-resize;
}
#container #hand2 {
position: absolute;
left: 39%;
top: 0;
bottom: 0;
width: 80px;
cursor: w-resize;
}
<div id="container">
<!-- Left side -->
<div id="left"> This is the left side's content!</div>
<!-- middle -->
<div id="middle">
<div id="hand2"></div> This is the middle content!
</div>
<!-- Right side -->
<div id="right">
<!-- Actual resize handle -->
<div id="handle"></div> This is the right side's content!
</div>
</div>
Been playing with it here: https://jsfiddle.net/ju9zb1he/5/

I was looking for a solution that required less extensive CSS. It does have one minor bug(FIXED), but hopefully this should get you started. Here is a DEMO.
Also I aimed to use DOM Traversal methods like .next() and .prev() that way it wouldn't be so attribute dependent, and would be easily reusable if you needed a feature like this multiple times on a page.
Edit - Further Explanation
The idea here is onClick of a .handle we want to gather the total width (var tWidth) of the .prev() and .next() divs relative to the .handle in the DOM. We can then use the start mouse position (var sPos) to substract the amount of pixels we've moved our mouse (e.pageX). Doing so gives us the correct width that the .prev() div should have on mousemove. To get the width of the .next() div we need only to subtract the width of the .prev() div from the total width (var tWidth) that we stored onClick of the .handle. Hope this helps! Let me know if you have any further questions, however I will likely be unavailable till tomorrow.
HTML
<div class="container">
<div id="left"></div>
<div id="l-handle" class="handle"></div>
<div id="middle"></div>
<div id="r-handle" class="handle"></div>
<div id="right"></div>
</div>
CSS
#left, #middle, #right {
display: inline-block;
background: #e5e5e5;
min-height: 200px;
margin: 0px;
}
#l-handle, #r-handle {
display: inline-block;
background: #000;
width: 2px;
min-height: 200px;
cursor: col-resize;
margin: 0px;
}
jQuery
var isDragging = false,
cWidth = $('.container').width(),
sPos,
handle,
tWidth;
$('#left, #middle, #right').width((cWidth / 3) - 7); // Set the initial width of content sections
$('.handle').on('mousedown', function(e){
isDragging = true;
sPos = e.pageX;
handle = $(this);
tWidth = handle.prev().width() + handle.next().width();
});
$(window).on('mouseup', function(e){
isDragging = false;
});
$('.container').on('mousemove', function(e){
if(isDragging){ // Added an additional condition here below
var cPos = sPos - e.pageX;
handle.prev().width((tWidth / 2) - cPos); // This was part of the bug...
handle.next().width(tWidth - handle.prev().width());
// Added an update to sPos here below
}
});
Edit
The bug was caused by 2 things.
1) On mousemove we were dividing the total width by two, instead of an updated mouse offset.
2) The sPos was not updating on mousemove, and stayed a static number based off of the click location.
Resolution
Update the sPos on mousemove that way the mouse offset is accurately based off of the previous mousemove position, rather than the click position. When this is done we can then subtract the .next() div's width from the total width. Then we subtract our current mouse position from the remaining width. The fiddle has been updated as well.
$('.container').on('mousemove', function(e){
var cPos = sPos - e.pageX;
if(isDragging && ((tWidth - handle.next().width()) - cPos) <= tWidth){
handle.prev().width((tWidth - handle.next().width()) - cPos);
handle.next().width(tWidth - handle.prev().width());
sPos = e.pageX;
}
});
Edit
Added an additional condition on mousemove to prevent the drag from exceeding the total width (var tWidth).

Can you please explain what you're trying to accomplish?
I don't believe you need to use position: absolute. The premise of absolute positioning is to override the margin and padding imposed on an element by its parent.
You don't need to do this, all elements have relative positioning by default which makes them push eachother around and don't allow overlapping.
I'm probably missing something, but I think this is what you want with nothing but some very basic CSS: http://jsfiddle.net/3bdoazpk/
<div class='first'>
asdf
</div><div class='second'>
dasdf
</div><div class='third'>
sadf
</div>
body {
margin: 0;
}
div {
display: inline-block;
height: 100%;
}
.first, .third {
width: 40%;
}
.first {
background-color: red;
}
.second {
background-color: blue;
width: 20%;
}
.third {
background-color: green;
}

How to dinamically update the child div width after insert other elements in the parent div

I have a main div (with fixed height and scroll-x and scroll-y):
<div style="position:relative;border:solid 2px #000;overflow-y:scroll;overflow-x:scroll; height:200px; width:100%;" id="pippo">
</div>
and a bunch of child div created dynamically in js and inserted in the parent div with absolute position:
<div style='z-index:3;position:absolute; top: 50px; left: "+pos+"px;border:solid 1px;'>m</div>
This divs can be created everywhere, also beyond the parent div height and width (I don't care because I get the scrollbars).
My problem is:
there are other child divs (created in js) that represent a background like a chart. The divs have a border and a width of 100%. An example of one of them:
<div style='z-index:2;border-bottom:solid 1px #ccc; color:#ccc;position:absolute;width:100%;bottom:"+yyy+"px;'>0</div>
When javascript create dynamically the divs, the background don't update his width to the new one (if the divs go beyond the parent measures).
So, if you scroll on the right, you don't see the background.
How can I do to give the right width (100%) to the background when the parent width is dynamically changed?
http://jsfiddle.net/4x2KP/157/
Thanks everybody!

I've do an work around to it, if you can add specific class to the axis divs.
You can listen to the scroll event on the #pippo and adjust the offset of the axis, as its fixed horizontally inside the #pippo. But you may have to separate the digit part and axis-line part to make the digit part movable by the scrollbar.
var t = 250;
var $axis;
var offsets;
$(document).ready(function(){
crea_bg();
setTimeout(function(){ pippo(); }, t);
});
var pos = 0;
function pippo(){
pos = pos + 30;
$("#pippo").append("<div style='z-index:3;position:absolute; top: 50px; left: "+pos+"px;border:solid 1px;'>m</div>");
setTimeout(function(){ pippo(); }, t);
}
function crea_bg(){
var yyy = 0;
$("#pippo").append("<div class='axis' style='z-index:2;border-bottom:solid 1px #ccc; color:#ccc;position:absolute;width:100%;bottom:"+yyy+"px;'>0</div>");
for (i = 25; i <= 300; i=i+25) {
$("#pippo").append("<div class='axis' style='z-index:2;border-bottom:solid 1px #ccc; color:#ccc;position:absolute;width:100%;bottom:"+(yyy+(-i))+"px;'>"+(-i)+"</div>");
$("#pippo").append("<div class='axis' style='z-index:2;border-bottom:solid 1px #ccc; color:#ccc;position:absolute;width:100%;bottom:"+(yyy+(i))+"px;'>"+i+"</div>");
}
$axis = $('.axis').css('left', 0);
}
$('#pippo').scroll(function() {
//var currentLeft = parseFloat($axis.css('left'));
//console.log($axis.css('left'), currentLeft, $axis.position().left);
//$axis.css('left', currentLeft - $axis.position().left);
$axis.css('left', '-=' + $axis.position().left);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<div style="position:relative;border:solid 2px #000;overflow-y:scroll;overflow-x:scroll; height:200px; width:100%;" id="pippo">
</div>

I'm not sure if this is what you are asking for, but this code creates those background lines at the same time that the letters are written.
You can adjust it easily changing the "width" var.
var t = 250;
$(document).ready(function(){
crea_bg();
setTimeout(function(){ pippo(); }, t);
});
var pos = 0;
function pippo(){
pos = pos + 30;
crea_bg();
$("#pippo").append("<div style='z-index:3;position:absolute; top: 50px;"
+" left: "+pos+"px;border:solid 1px;'>m</div>");
setTimeout(function(){ pippo(); }, t);
}
function crea_bg(){
var yyy = 0;
var width = pos + 30;
$("#pippo").append("<div style='z-index:2;border-bottom:solid 1px #ccc;"
+"color:#ccc;position:absolute;width:"+width+"px;bottom:"+yyy+"px;'>0</div>");
for (i = 25; i <= 300; i=i+25) {
$("#pippo").append("<div style='z-index:2;border-bottom:solid 1px #ccc;"
+" color:#ccc;position:absolute;width:"+width+"px;bottom:"+(yyy+(-i))+"px;'>"+(-i)+"</div>");
$("#pippo").append("<div style='z-index:2;border-bottom:solid 1px #ccc;"
+ "color:#ccc;position:absolute;width:"+width+"px;bottom:"+(yyy+(i))+"px;'>"+i+"</div>");
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<div style="position:relative;border:solid 2px #000;overflow-y:scroll;overflow-x:scroll; height:200px; width:100%;" id="pippo">
</div>

Avoiding the typical document flow
If you must avoid the typical document flow, you'll need to insert another container between <div id="pippo"> and its child elements, then manually update the new container's width/height as needed.
Staying within the typical document flow
If you don't need to work around the normal document flow and are just searching for any possible way to make a parent expand, use a combination of display: inline-block and white-space: nowrap:
$(document).ready(function() {
setInterval(function() {
$('#pippo').append('<div class="childDiv">m</div>')
}, 250);
});
#pippo {
border: solid 2px #000;
height: 200px;
width: 100%;
overflow-y: scroll;
overflow-x: scroll;
white-space: nowrap;
}
.childDiv {
display: inline-block;
border: solid 1px #000;
margin: 5px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<div id="pippo"></div>

jitter when using jquery to alter background-position

Here's the jsfiddle.
It's the interface to cropping an image. As you can see the selection div takes the same background image and positions it to the negative of the top and left attributes of the selection div. In theory this should give a perfect overlap, but there's a jitter as you move the selection div around, and I can't seem to figure out what is causing it.
html
<div id="main">
<div id="selection"></div>
</div>
css
#main {
width: 600px;
height: 450px;
position: relative;
background: url("http://cdn-2.historyguy.com/celebrity_history/Scarlett_Johansson.jpg");
background-size: contain;
}
#selection {
width: 100px;
height: 100px;
position: absolute;
background: url("http://cdn-2.historyguy.com/celebrity_history/Scarlett_Johansson.jpg");
border: 1px dotted white;
background-size: 600px 450px;
}
jquery
$(document).ready(function () {
var move = false;
var offset = [];
var selection = null;
$("#selection").mousedown(function (e) {
move = true;
selection = $(this);
offset = [e.pageX - selection.offset().left, e.pageY - selection.offset().top];
});
$("#selection").mousemove(function (e) {
if (move == true) {
selection.css("left", e.pageX - offset[0]);
selection.css("top", e.pageY - offset[1]);
selection.css("background-position", (((-selection.position().left) - 1) + "px " + ((-selection.position().top ) - 1) + "px"));
}
});
$("#selection").mouseup(function (e) {
move = false;
});
})

It would appear that there is a value of 5 offset that needs to be added to ensure seamlessness
DEMO http://jsfiddle.net/nzx0fcp5/2/
offset = [e.pageX - selection.offset().left + 5, e.pageY - selection.offset().top + 5];

So, while experimenting I discovered that this was only a problem at certain sizes of the image. At the original size it is no problem, neither at half nor a quarter of this size. It wasn't simply a matter of keeping the image in proportion not having the image square or using even pixel sizes. I'm assuming this had something to do with partial pixel sizes, but I'm not sure, and I couldn't see any way to work around this, at least none that seemed worth the effort.
So while checking out the code of other croppers I took a look at POF's image cropper, they seem to have got round the problem by not using the background-position property at all (I'm not sure if it's plugin or they coded it themselves). They just set the image down and then used a transparent selection div with 4 divs stuck to each edge for the shading. So there's no pixel crunching on the fly at all. I like the simplicity and lightweight nature of this design and knocked up a version myself in jsfiddle to see if I could get it to work well.
new jitter free jsfiddle with no pixel crunching
I liked the solution for the preview box as well.
html
<body>
<div id="main">
<img src="http://flavorwire.files.wordpress.com/2012/01/scarlett_johansson.jpg" />
<div id="upperShade" class="shade" > </div>
<div id="leftShade" class="shade" > </div>
<div id="selection"></div>
<div id="rightShade" class="shade"></div>
<div id="lowerShade" class="shade" ></div>
</div>
</body>
css
#main {
position:relative;
width: 450px;
height: 600px;
}
#selection {
width: 148px;
height: 148px;
position: absolute;
border: 1px dotted white;
top: 0px;
left: 0px;
z-index: 1;
}
.shade {
background-color: black;
opacity: 0.5;
position: absolute;
}
#upperShade {
top: 0px;
left: 0px;
width: 600px;
}
#leftShade {
left: 0px;
top: 0px;
height: 150px;
width: auto;
}
#rightShade {
left: 150px;
top: 0px;
height: 150px;
width: 450px;
}
#lowerShade {
left:0px;
top: 150px;
width: 600px;
height: 300px;
}
jquery
$(document).ready(function () {
var move = false;
var offset = [];
var selection = null;
$("#selection").mousedown(function (e) {
move = true;
selection = $(this);
offset = [e.pageX - selection.offset().left, e.pageY - selection.offset().top];
});
$("#selection").mousemove(function (e) {
if (move == true) {
selection.css("left", e.pageX - offset[0]);
selection.css("top", e.pageY - offset[1]);
setShade();
}
});
function setShade() {
$("#upperShade").css("height", selection.position().top);
$("#lowerShade").css("height", 600 - (selection.position().top + 150));
$("#lowerShade").css("top", selection.position().top + 150);
$("#leftShade").css("top", selection.position().top);
$("#leftShade").css("width", selection.position().left);
$("#rightShade").css("top", selection.position().top);
$("#rightShade").css("left", selection.position().left + 150);
$("#rightShade").css("width", 450 - selection.position().left);
}
$("#selection").mouseup(function (e) {
move = false;
});
});

Dynamically creating triangle with max-width/fit inside div

I have a web page that accepts three inputs.
I am dynamically creating a triangle from these three inputs (by setting border-widths).
I want the triangle to fit inside the div on the page. For example, if the inputs were 500, 500, 300 I want to reduce these to fit inside the div on the page while retaining the aspect ratio of the inputs.
HTML:
<div id="triangle"></div>
CSS:
#triangle {
max-width: 200px;
width: 0;
height: 0;
margin: 0 auto;
}
jQuery:
$("#triangle").css({
"border-left": length1 + "px solid transparent",
"border-right": length2 + "px solid transparent",
"border-bottom": length3 + "px solid #2383ea"
});

Here is one way of doing it.
Start with the following HTML, two nested block elements:
<div id="triangle"><div class="inner"></div></div>
and some basic CSS:
body {
margin: 0;
}
#triangle {
border: 1px dotted gray;
max-width: 400px;
margin: 0 auto;
}
#triangle .inner {
width: 0;
height: 0;
}
and now use the following jQuery/JavaScript:
var length1 = 1500;
var length2 = 1500;
var length3 = 1500;
var maxWidth = parseInt($("#triangle").css("max-width"));
var baseWidth = Math.min($("#triangle").width(),maxWidth);
var scale = baseWidth/(length1+length2);
$("#triangle .inner").css({
"border-left": length1*scale + "px solid red",
"border-right": length2*scale + "px solid green",
"border-bottom": length3*scale+ "px solid #2383ea"
});
You can see a demo at: http://jsfiddle.net/audetwebdesign/WVcvj/
Programming Notes
You will enter the length1, length2 and length3 from a form or something.
By default, #triangle will take on the width of the parent container, so use that width if it is smaller than the maximum width (you can get the value using the .css function). The parseInt() function will strip out the px label that comes with the value.
The base of the triangle has a width of length1+length2, so calculate the ratio of the available width to the specified width.
You then normalize the three border widths and you are done!