I'm using the svg circles in my project like this,
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 160 120">
<g>
<g id="one">
<circle fill="green" cx="100" cy="105" r="20" />
</g>
<g id="two">
<circle fill="orange" cx="100" cy="95" r="20" />
</g>
</g>
</svg>
And I'm using the z-index in the g tag to show the elements the first. In my project I need to use only z-index value, but I can't use the z-index to my svg elements. I have googled a lot but I didn't find anything relatively.
So please help me to use z-index in my svg.
Here is the DEMO.
Specification
In the SVG specification version 1.1 the rendering order is based on the document order:
first element -> "painted" first
Reference to the SVG 1.1. Specification
3.3 Rendering Order
Elements in an SVG document fragment have an implicit drawing order, with the first elements in the SVG document fragment getting "painted" first. Subsequent elements are painted on top of previously painted elements.
Solution (cleaner-faster)
You should put the green circle as the latest object to be drawn. So swap the two elements.
<svg xmlns="http://www.w3.org/2000/svg" viewBox="30 70 160 120">
<!-- First draw the orange circle -->
<circle fill="orange" cx="100" cy="95" r="20"/>
<!-- Then draw the green circle over the current canvas -->
<circle fill="green" cx="100" cy="105" r="20"/>
</svg>
Here the fork of your jsFiddle.
Solution (alternative)
The tag use with the attribute xlink:href (just href for SVG 2) and as value the id of the element. Keep in mind that might not be the best solution even if the result seems fine. Having a bit of time, here the link of the specification SVG 1.1 "use" Element.
Purpose:
To avoid requiring authors to modify the referenced document to add an ID to the root element.
<svg xmlns="http://www.w3.org/2000/svg" viewBox="30 70 160 120">
<!-- First draw the green circle -->
<circle id="one" fill="green" cx="100" cy="105" r="20" />
<!-- Then draw the orange circle over the current canvas -->
<circle id="two" fill="orange" cx="100" cy="95" r="20" />
<!-- Finally draw again the green circle over the current canvas -->
<use xlink:href="#one"/>
</svg>
Notes on SVG 2
SVG 2 Specification is the next major release and still supports the above features.
3.4. Rendering order
Elements in SVG are positioned in three dimensions. In addition to their position on the x and y axis of the SVG viewport, SVG elements are also positioned on the z axis. The position on the z-axis defines the order that they are painted.
Along the z axis, elements are grouped into stacking contexts.
3.4.1. Establishing a stacking context in SVG
...
Stacking contexts are conceptual tools used to describe the order in which elements must be painted one on top of the other when the document is rendered, ...
SVG 2 Support Mozilla - Painting
How do I know if my browser supports svg 2.0
Can I use SVG
Deprecated XLink namespace For SVG 2 use href instead of the additional deprecated namespace xlink:href (Thanks G07cha)
As others here have said, z-index is defined by the order the element appears in the DOM. If manually reordering your html isn't an option or would be difficult, you can use D3 to reorder SVG groups/objects.
Use D3 to Update DOM Order and Mimic Z-Index Functionality
Updating SVG Element Z-Index With D3
At the most basic level (and if you aren't using IDs for anything else), you can use element IDs as a stand-in for z-index and reorder with those. Beyond that you can pretty much let your imagination run wild.
Examples in code snippet
var circles = d3.selectAll('circle')
var label = d3.select('svg').append('text')
.attr('transform', 'translate(' + [5,100] + ')')
var zOrders = {
IDs: circles[0].map(function(cv){ return cv.id; }),
xPos: circles[0].map(function(cv){ return cv.cx.baseVal.value; }),
yPos: circles[0].map(function(cv){ return cv.cy.baseVal.value; }),
radii: circles[0].map(function(cv){ return cv.r.baseVal.value; }),
customOrder: [3, 4, 1, 2, 5]
}
var setOrderBy = 'IDs';
var setOrder = d3.descending;
label.text(setOrderBy);
circles.data(zOrders[setOrderBy])
circles.sort(setOrder);
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 100">
<circle id="1" fill="green" cx="50" cy="40" r="20"/>
<circle id="2" fill="orange" cx="60" cy="50" r="18"/>
<circle id="3" fill="red" cx="40" cy="55" r="10"/>
<circle id="4" fill="blue" cx="70" cy="20" r="30"/>
<circle id="5" fill="pink" cx="35" cy="20" r="15"/>
</svg>
The basic idea is:
Use D3 to select the SVG DOM elements.
var circles = d3.selectAll('circle')
Create some array of z-indices with a 1:1 relationship with your SVG elements (that you want to reorder). Z-index arrays used in the examples below are IDs, x & y position, radii, etc....
var zOrders = {
IDs: circles[0].map(function(cv){ return cv.id; }),
xPos: circles[0].map(function(cv){ return cv.cx.baseVal.value; }),
yPos: circles[0].map(function(cv){ return cv.cy.baseVal.value; }),
radii: circles[0].map(function(cv){ return cv.r.baseVal.value; }),
customOrder: [3, 4, 1, 2, 5]
}
Then, use D3 to bind your z-indices to that selection.
circles.data(zOrders[setOrderBy]);
Lastly, call D3.sort to reorder the elements in the DOM based on the data.
circles.sort(setOrder);
Examples
You can stack by ID
With leftmost SVG on top
Smallest radii on top
Or Specify an array to apply z-index for a specific ordering -- in my example code the array [3,4,1,2,5] moves/reorders the 3rd circle (in the original HTML order) to be 1st in the DOM, 4th to be 2nd, 1st to be 3rd, and so on...
Try to invert #one and #two. Have a look to this fiddle : http://jsfiddle.net/hu2pk/3/
Update
In SVG, z-index is defined by the order the element appears in the document. You can have a look to this page too if you want : https://stackoverflow.com/a/482147/1932751
You can use use.
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 160 120">
<g>
<g id="one">
<circle fill="green" cx="100" cy="105" r="20" />
</g>
<g id="two">
<circle fill="orange" cx="100" cy="95" r="20" />
</g>
</g>
<use xlink:href="#one" />
</svg>
The green circle appears on top.
jsFiddle
As discussed, svgs render in order and don't take z-index into account (for now). Maybe just send the specific element to the bottom of its parent so that it'll render last.
function bringToTop(targetElement){
// put the element at the bottom of its parent
let parent = targetElement.parentNode;
parent.appendChild(targetElement);
}
// then just pass through the element you wish to bring to the top
bringToTop(document.getElementById("one"));
Worked for me.
Update
If you have a nested SVG, containing groups, you'll need to bring the item out of its parentNode.
function bringToTopofSVG(targetElement){
let parent = targetElement.ownerSVGElement;
parent.appendChild(targetElement);
}
A nice feature of SVG's is that each element contains it's location regardless of what group it's nested in :+1:
Using D3:
If you want to re-inserts each selected element, in order, as the last child of its parent.
selection.raise()
Using D3:
If you want to add the element in the reverse order to the data, use:
.insert('g', ":first-child")
Instead of .append('g')
Adding an element to top of a group element
There is no z-index for svgs. But svg determines which of your elements are the uppermost by theire position in the DOM. Thus you can remove the Object and place it to the end of the svg making it the "last rendered" element. That one is then rendered "topmost" visually.
Using jQuery:
function moveUp(thisObject){
thisObject.appendTo(thisObject.parents('svg>g'));
}
usage:
moveUp($('#myTopElement'));
Using D3.js:
d3.selection.prototype.moveUp = function() {
return this.each(function() {
this.parentNode.appendChild(this);
});
};
usage:
myTopElement.moveUp();
This is the top Google result for searches regarding z-index and SVGs. After reading all the answers, some of which are very good, I was still confused.
So for rookies like me, here is the current summary, 9 years later in 2022.
You can't use z-index with SVGs.
In SVGs, z-index is defined by the order the element appears in the document.
If you want something to appear on top, or closer to the user, draw it last or insert it before. Source
SVG 2 could support z-index but might never come out
SVG 2 is a proposal to implement that and other features but it is at risk of never moving forward.
SVG 2 reached the Candidate Recommendation stage in 2016, and was revised in 2018 and the latest draft was released on 8 June 2021. Source
However it doesn't have a lot of support and very few people are working on it. Source So don't hold your breath waiting for this.
You could use D3 but probably shouldn't
D3 a commonly used to visualize data supports z-index by binding your z-index and then sorting but it is a large and complex library and might not be the best bet if you just want a certain SVG to appear on top of a stack.
The clean, fast, and easy solutions posted as of the date of this answer are unsatisfactory. They are constructed over the flawed statement that SVG documents lack z order. Libraries are not necessary either. One line of code can perform most operations to manipulate the z order of objects or groups of objects that might be required in the development of an app that moves 2D objects around in an x-y-z space.
Z Order Definitely Exists in SVG Document Fragments
What is called an SVG document fragment is a tree of elements derived from the base node type SVGElement. The root node of an SVG document fragment is an SVGSVGElement, which corresponds to an HTML5 <svg> tag. The SVGGElement corresponds to the <g> tag and permits aggregating children.
Having a z-index attribute on the SVGElement as in CSS would defeat the SVG rendering model. Sections 3.3 and 3.4 of W3C SVG Recommendation v1.1 2nd Edition state that SVG document fragments (trees of offspring from an SVGSVGElement) are rendered using what is called a depth first search of the tree. That scheme is a z order in every sense of the term.
Z order is actually a computer vision shortcut to avoid the need for true 3D rendering with the complexities and computing demands of ray tracing. The linear equation for the implicit z-index of elements in an SVG document fragment.
z-index = z-index_of_svg_tag + depth_first_tree_index / tree_node_qty
This is important because if you want to move a circle that was below a square to above it, you simply insert the square before the circle. This can be done easily in JavaScript.
Supporting Methods
SVGElement instances have two methods that support simple and easy z order manipulation.
parent.removeChild(child)
parent.insertBefore(child, childRef)
The Correct Answer That Doesn't Create a Mess
Because the SVGGElement (<g> tag) can be removed and inserted just as easily as a SVGCircleElement or any other shape, image layers typical of Adobe products and other graphics tools can be implemented with ease using the SVGGElement. This JavaScript is essentially a Move Below command.
parent.insertBefore(parent.removeChild(gRobot), gDoorway)
If the layer of a robot drawn as children of SVGGElement gRobot was before the doorway drawn as children of SVGGElement gDoorway, the robot is now behind the doorway because the z order of the doorway is now one plus the z order of the robot.
A Move Above command is almost as easy.
parent.insertBefore(parent.removeChild(gRobot), gDoorway.nextSibling())
Just think a=a and b=b to remember this.
insert after = move above
insert before = move below
Leaving the DOM in a State Consistent With the View
The reason this answer is correct is because it is minimal and complete and, like the internals of Adobe products or other well designed graphics editors, leaves the internal representation in a state that is consistent with the view created by rendering.
Alternative But Limited Approach
Another approach commonly used is to use CSS z-index in conjunction with multiple SVG document fragments (SVG tags) with mostly transparent backgrounds in all but the bottom one. Again, this defeats the elegance of the SVG rendering model, making it difficult to move objects up or down in the z order.
NOTES:
(https://www.w3.org/TR/SVG/render.html v 1.1, 2nd Edition, 16 August 2011)
3.3 Rendering Order Elements in an SVG document fragment have an implicit drawing order, with the first elements in the SVG document
fragment getting "painted" first. Subsequent elements are painted on
top of previously painted elements.
3.4 How groups are rendered Grouping elements such as the ‘g’ element (see container elements) have the effect of producing a temporary
separate canvas initialized to transparent black onto which child
elements are painted. Upon the completion of the group, any filter
effects specified for the group are applied to create a modified
temporary canvas. The modified temporary canvas is composited into the
background, taking into account any group-level masking and opacity
settings on the group.
Another solution would be to use divs, which do use zIndex to contain the SVG elements.As here:
https://stackoverflow.com/a/28904640/4552494
We have already 2019 and z-index is still not supported in SVG.
You can see on the site SVG2 support in Mozilla that the state for z-index – Not implemented.
You can also see on the site Bug 360148 "Support the 'z-index' property on SVG elements" (Reported: 12 years ago).
But you have 3 possibilities in SVG to set it:
With element.appendChild(aChild);
With parentNode.insertBefore(newNode, referenceNode);
With targetElement.insertAdjacentElement(positionStr, newElement); (No support in IE for SVG)
Interactive demo example
With all this 3 functions.
var state = 0,
index = 100;
document.onclick = function(e)
{
if(e.target.getAttribute('class') == 'clickable')
{
var parent = e.target.parentNode;
if(state == 0)
parent.appendChild(e.target);
else if(state == 1)
parent.insertBefore(e.target, null); //null - adds it on the end
else if(state == 2)
parent.insertAdjacentElement('beforeend', e.target);
else
e.target.style.zIndex = index++;
}
};
if(!document.querySelector('svg').insertAdjacentElement)
{
var label = document.querySelectorAll('label')[2];
label.setAttribute('disabled','disabled');
label.style.color = '#aaa';
label.style.background = '#eee';
label.style.cursor = 'not-allowed';
label.title = 'This function is not supported in SVG for your browser.';
}
label{background:#cef;padding:5px;cursor:pointer}
.clickable{cursor:pointer}
With:
<label><input type="radio" name="check" onclick="state=0" checked/>appendChild()</label>
<label><input type="radio" name="check" onclick="state=1"/>insertBefore()</label><br><br>
<label><input type="radio" name="check" onclick="state=2"/>insertAdjacentElement()</label>
<label><input type="radio" name="check" onclick="state=3"/>Try it with z-index</label>
<br>
<svg width="150" height="150" viewBox="0 0 150 150">
<g stroke="none">
<rect id="i1" class="clickable" x="10" y="10" width="50" height="50" fill="#80f"/>
<rect id="i2" class="clickable" x="40" y="40" width="50" height="50" fill="#8f0"/>
<rect id="i3" class="clickable" x="70" y="70" width="50" height="50" fill="#08f"/>
</g>
</svg>
Push SVG element to last, so that its z-index will be in top. In SVG, there s no property called z-index. try below javascript to bring the element to top.
var Target = document.getElementById(event.currentTarget.id);
var svg = document.getElementById("SVGEditor");
svg.insertBefore(Target, svg.lastChild.nextSibling);
Target: Is an element for which we need to bring it to top
svg: Is the container of elements
Move to front by transform:TranslateZ
Warning: Only works in FireFox
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 160 160" style="width:160px; height:160px;">
<g style="transform-style: preserve-3d;">
<g id="one" style="transform-style: preserve-3d;">
<circle fill="green" cx="100" cy="105" r="20" style="transform:TranslateZ(1px);"></circle>
</g>
<g id="two" style="transform-style: preserve-3d;">
<circle fill="orange" cx="100" cy="95" r="20"></circle>
</g>
</g>
</svg>
A better example of use, that I've ended up using.
<svg>
<defs>
<circle id="one" fill="green" cx="40" cy="40" r="20" />
<circle id="two" fill="orange" cx="50" cy="40" r="20"/>
</defs>
<use href="#two" />
<use href="#one" />
</svg>
To control the order you can change href attribute values of these use elements. This can be useful for animation.
Thanks to defs, circle elements are drawn only once.
jsfiddle.net/7msv2w5d
its easy to do it:
clone your items
sort cloned items
replace items by cloned
function rebuildElementsOrder( selector, orderAttr, sortFnCallback ) {
let $items = $(selector);
let $cloned = $items.clone();
$cloned.sort(sortFnCallback != null ? sortFnCallback : function(a,b) {
let i0 = a.getAttribute(orderAttr)?parseInt(a.getAttribute(orderAttr)):0,
i1 = b.getAttribute(orderAttr)?parseInt(b.getAttribute(orderAttr)):0;
return i0 > i1?1:-1;
});
$items.each(function(i, e){
e.replaceWith($cloned[i]);
})
}
$('use[order]').click(function() {
rebuildElementsOrder('use[order]', 'order');
/* you can use z-index property for inline css declaration
** getComputedStyle always return "auto" in both Internal and External CSS decl [tested in chrome]
rebuildElementsOrder( 'use[order]', null, function(a, b) {
let i0 = a.style.zIndex?parseInt(a.style.zIndex):0,
i1 = b.style.zIndex?parseInt(b.style.zIndex):0;
return i0 > i1?1:-1;
});
*/
});
use[order] {
cursor: pointer;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" id="keybContainer" viewBox="0 0 150 150" xml:space="preserve">
<defs>
<symbol id="sym-cr" preserveAspectRatio="xMidYMid meet" viewBox="0 0 60 60">
<circle cx="30" cy="30" r="30" />
<text x="30" y="30" text-anchor="middle" font-size="0.45em" fill="white">
<tspan dy="0.2em">Click to reorder</tspan>
</text>
</symbol>
</defs>
<use order="1" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sym-cr" x="0" y="0" width="60" height="60" style="fill: #ff9700; z-index: 1;"></use>
<use order="4" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sym-cr" x="50" y="20" width="50" height="50" style="fill: #0D47A1; z-index: 4;"></use>
<use order="5" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sym-cr" x="15" y="30" width="50" height="40" style="fill: #9E9E9E; z-index: 5;"></use>
<use order="3" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sym-cr" x="25" y="30" width="80" height="80" style="fill: #D1E163; z-index: 3;"></use>
<use order="2" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sym-cr" x="30" y="0" width="50" height="70" style="fill: #00BCD4; z-index: 2;"></use>
<use order="0" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sym-cr" x="5" y="5" width="100" height="100" style="fill: #E91E63; z-index: 0;"></use>
</svg>
Just wanted to add a trick that works when you want to put a specific element on top.
function moveInFront(element) {
const svg = element.closest('svg'); // Find the parent SVG
svg.appendChild(element); // Append child moves the element to the end
}
This works because, and I quote the docs, "appendChild() moves [the element] from its current position to the new position" instead of adding a copy.
Note: If the element is nested, you would have to move the element to front within the group, and perhaps move the group to front as well.
use works for this purpose, but those elements that are placed with use help after is hard to manipulate...
What I couldn't figure out after I used it was: why I couldn't hover (neither mouseover, mouseenter manipulations from js would work) on the use elements to get additional functionality - like ~ showing text over the circles ~
After returned to circle reordering as it was only way to manipulate with those svg objects
I'm trying to construct a buttons collection for a website. Since the buttons share several properties (colours and effects) I've decided to use SVG. In order to reduce the HTTP requests, I tried to nest several elements and filters inside the same SVG file. The idea is instantiate these elements to construct all the buttons, toggle switches, etc by simply using the <use> tag.
After reading great articles like this, this, and this I'm still not being able to do such thing. I found myself stuck. So I decided to simplify the problem as much as I could within the snippet down bellow.
<style>
svg,
img,
object {
width: 50px;
height: 50px;
border: 1px solid black;
}
h3 {
margin-top: 50px;
}
</style>
<h1>Swimming Veggies. The SVG club that's driving me nuts.</h1>
<h3>This is an inline SVG.</h3>
<svg viewBox="0 0 50 50">
<g id="pool">
<rect width="50" height="50" fill="aqua" />
</g>
<symbol id="tomato">
<circle cx="35" cy="35" r="10" fill="tomato" />
</symbol>
<g id="orange">
<circle cx="15" cy="15" r="12" fill="orange" />
</g>
</svg>
<p>Things work as expected here. The <g> elements #pool and #orange show up while the <symbol id="tomato"> doesn't. Great!</p>
<h3>This is a SVG using <use> to referencing elements from the inline SVG above.</h3>
<svg style="border: 1px solid black;" width="50" height="50">
<use xlink:href="#pool"></use>
<use xlink:href="#tomato"></use>
</svg>
<p>Note that the <symbol id="tomato"> element shows up here like the g elemet "pool". The "orange" element is NOT being <use>d. Works fine. Expected behaviour.</p>
<h3>This is a SVG being put as an IMG.</h3>
<img src="club.svg">
<p>Works fine to me and the absence of the <symbol id="tomato"> is the expeted behaviour. I don't want to use SVG this way though.</p>
<p> Unfortunately, IMGUR didn't accept SVGs and I didn't find an image sharing platform that accepts SVG files. The "club.svg" file has the same content as the commented code at the end of this HTML snippet. The SVG file is located ON THE SAME FOLDER of the HTML file. Sorry for the inconvenience :(</p>
<h3>This is a SVG being put as an OBJECT</h3>
<object type="image/svg+xml" data="club.svg"></object>
<p>This works as expected.</p>
<p>Again, the "club.svg" file content is shown as a comment inside and at the end of this HTML snippet.</p>
<h3>An unsuccessful attempt to extract elements from an OBJECT SVG </h3>
<object type="image/svg+xml" data="club.svg#tomato"></object>
<p>The browser is ignoring the "#tomato" after the file name. Is it possible to extract/manipulate elements inside the SVG file this way? If so, how?</p>
<h3>This is a SVG being put as an external reference.</h3>
<svg>
<use xlink:href="club.svg#pool"></use>
<use xlink:href="club.svg#tomato"></use>
<use xlink:href="club.svg#orange"></use>
</svg>
<p>That would be my preferable way to clone/manipulate elements from an external source (in this case, "club.svg"). Unfortunately, it's not working for me. It's not clonning the element. What am I doing wrong?</p>
<h3>Here goes the club.svg content (it's commented inside the snippet).</h3>
<!--
Down bellow is the code inside the club.svg file:
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 50 50">
<g id="pool">
<rect width="50" height="50" fill="aqua" />
</g>
<symbol id="tomato">
<circle cx="35" cy="35" r="10" fill="tomato" />
</symbol>
<g id="orange">
<circle cx="15" cy="15" r="12" fill="orange" />
</g>
</svg>
-->
By the way... I tried to open up the file on Brave, Opera, Chrome and Safari. All of them show the same results.
Any help will be very much appreciated.
I need to make text automatically stretch in both dimensions, to fill a container. It will distort.
This shows the the container space in red
This shows what a long name would normally resize to put in that space and maintaining aspect ratio
.
This shows what my client wants to happen
.
I would prefer to use SVG but I will work with what works.
I have searched for a solution to the best of my abilities but all seem to either refer to maintaining aspect ratio or stretching text when the page or viewbox changes dimensions.
That's quite a broad question, but yes you can do it with svg, I'll let you implement it though since you didn't provided anything to chew on.
The key point is to set your svg's preserveAspectRatio to "none":
svg{
height: 100vh;
width: 50vw;
}
body{
margin:0;
}
<div>
<svg xmlns="http://www.w3.org/2000/svg"
viewBox="0 0 300 40" preserveAspectRatio="none">
<text x="0" y="35" font-family="Verdana" font-size="35">
Hello, out there
</text>
</svg>
</div>
If your text is already part of an SVG (as it appears in your example), you will probably need to use a nested <svg> element.
<svg width="400" height="400">
<rect width="400" height="400" fill="rebeccapurple"/>
<!-- rect representing area that our text has to squeeze into -->
<rect x="20" y="50" width="200" height="50" fill="white"/>
<!-- x y width height match above rect -->
<!-- viewBox values need to match text bounds -->
<svg x="20" y="50" width="200" height="50"
viewBox="0 8 244 28" preserveAspectRatio="none">
<text x="0" y="35" font-family="Verdana" font-size="35">
HELLO THERE
</text>
</svg>
</svg>
The hardest part is workoing out the correct values for viewBox. It needs to match the bounds of the (normal unsqueezed) text.
Why would a demo such as this: http://jsbin.com/ejorus/2/edit, have an <svg> element nested inside another <svg> element?
<svg class="graph">
<svg viewBox="0 0 1000 1000" preserveAspectRatio="none">
<g transform="translate(30,0)">
<!-- ... -->
</g>
</svg>
</svg>
The JS Bin is a modified version of the demo in this blog post: http://meloncholy.com/blog/making-responsive-svg-graphs/
Nesting SVG elements can be useful to group SVG shapes together, and
position them as a collection. All shapes nested inside an svg element
will be positioned (x, y) relative to the position (x, y) of its
enclosing svg element. By moving the x and y coordinates of the
enclosing svg element, you move all the nested shapes too.
Here is an example where two rectangles are nested inside two svg
elements. Except for the colors the two rectangles have the same
definitions for x, y, height, and width. The enclosing svg
elements have different x-values. Since the x-position of the
rectangles are interpreted relative to their enclosing svg elements
x-position, the two rectangles are displayed at different
x-positions.
- By Jakob Jenkov
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<svg x="10">
<rect x="10" y="10" height="100" width="100"
style="stroke:#ff0000; fill: #0000ff"/>
</svg>
<svg x="200">
<rect x="10" y="10" height="100" width="100"
style="stroke:#009900; fill: #00cc00"/>
</svg>
</svg>
Credits
You're right (as you say in Mr. Alien's answer) that both SVG elements have the same relative positions, and indeed the graph displays fine without the outer SVG.
The reason I added it is because the JavaScript (which I needed to stop the labels getting squished) uses the SVG element's transform matrix (caused by the applied viewBox attribute) to unscale the text.
Unfortunately the returned matrix doesn't take account of transformations applied to the SVG element itself, so I needed to get the transform matrix relative to an outer element that used the initial coordinate system instead. Hope that helps.
You can define a new viewport & viewbox. With this option, you can use relative positions like as css. For more information, you can see this online article.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Nested SVG</title>
<style>
html,
body {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
overflow: hidden;
}
</style>
</head>
<body>
<svg width="100%" height="100%">
<rect x="25%" y="25%" width="50%" height="50%" style="fill: dodgerblue;" />
<svg x="25%" y="25%" width="50%" height="50%">
<rect x="25%" y="25%" width="50%" height="50%" style="fill: tomato;" />
</svg>
</svg>
</body>
</html>
I am about to do this for an entirely different reason: website implementation efficiency.
I have several SVG files that I insert into my web page after downloading them via AJAX. I want to consolidate them into one file because that's better for downloading. I could do this with a text file and then insert the SVG text into a web page element's innerHTML property, but .svg files offer two additional advantages over .txt files:
1) The standard .svgz format allows you to store pre-zipped files on the web server, no need for mod_deflate. SVG files zip very efficiently, I'm seeing 70-85% compression.
2) The web browser parses the SVG outside of my javascript code, hopefully more efficiently. To insert the svg element into the HTML, I use the parent element's insertBefore or appendChild method instead of innerHTML.
I have a rather large tree diagram modeled in SVG.
It renders well, with vertical scrolling as desired, in IE-9.
In Chrome and Firefox, not so. No scrolling in Chrome but zooming out lets me see a little more.
In Firefox, it is only showing a token amount of the vertical space.
I assume I am missing some attributes in the "svg" element to make it show up correctly in Chrome/Firefox but not sure what.
Here is how the doc source starts:
<!DOCTYPE html>
<html>
<body>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" height="100%" width="100%" style="overflow-x: auto; overflow-y: auto;" >
<rect x="685" y="15" rx="10" ry="10" width="380" height="116" style="fill:lightgrey;stroke-width:5;stroke:rgb(0,0,0)" />
<text x="777" y="38" fill="black" font-size = "18" font-family = "sans-serif" font-weight="bold">Folder</text>
<text x="960" y="38" fill="black" font-size = "18" font-family = "sans-serif" font-weight="bold">Content</text>
<rect x="700" y="45" rx="10" ry="10" width="200" height="75" style="fill:powderblue;stroke-width:1;stroke:rgb(0,0,0)" />
................... and so on for 150000 lines ...................
Any ideas on what can be added so it will render in Chrome/Firefox as it does in IE-9?
Hard coding values into "height" and "width" solved the acute problem of no scrolling in Chrome and Firefox.
Making the script that generates the svg smarter to put in appropriate values for "height" and "width" is a better solution but for now, just setting
height="50000" width="2400"
instead of using the % values, worked for me.