How to place two canvases on top of one another? - html

I found similar topics but they all used absolute positioning which placed the canvases at the top left of the page. I have them contained within a div but I'm not sure exactly how to get them to layer properly. I tried using absolute and relative positioning in CSS but I wasn't having any luck.

Do this:
<style>
#container { position: relative; }
.canvas { position: absolute; top: 0; left: 0; }
</style>
<div id="container">
<canvas class="canvas" id="canvas1"></canvas>
<canvas class="canvas" id="canvas2"></canvas>
</div>

Make sure to add position: relative to the containing div in order to position the canvas elements absolutely within it.

Related

Layers on top with dynamic width, alternatives other than position: absolute

The only way I know to get a layer on top is to use position: absolute.
(top good, bottom bad)
Once you do that you pretty much lose the option to scale dynamically with the rest of the page.
Sure you can do some width: calc(62% - 60px); hacking and get it almost there, or you can write a script that calculates the size etc..
But is there really no way to have a layer on top and still have it scaling with the page?
Its possible with position:relative; Relatively positioned elements takes the width of parent & can be bring on top by using z-index. z-index is applicable only on positioned elements.
Sample Code:
.menuParent{
height:34px;border:1px solid black;
}
.menu{
width:100%;position:relative;border:1px solid red;top:34px;z-index:1;background: white;
}
<div style="width:120px;" class="menuParent">
<div class="menu">
<div>AirBnb</div>
<div>Booking.com</div>
<div>Expedia
<div>Agents</div>
</div>ThaiHome</div>
</div>
<div> Other div below the menu list</div><br/><br/><br/><br/><br/>
<div style="width:240px;"class="menuParent">
<div class="menu">
<div>AirBnb</div>
<div>Booking.com</div>
<div>Expedia
<div>Agents</div>
</div>ThaiHome</div>
</div>
<div> Other div below the menu list width bigger width</div>
parent{
position: relative;
}
child {
position: absolute;
bottom: 0;
left: 0;
width: 100%;
}

CSS Can't move my images

I'm trying to move some images but I can't move them. I moved other images just fine but these ones won't move?
HTML: (it's a little larger with more images but i can't even move one)
<main>
<p class="window1"> Window 1 </p>
<img class="uparrow1" src="images/up.png" alt="Up">
</main>
CSS:
.uparrow1 {
position: absolute;
top: 300px;
left: 100px;
}
It doesn't response at any command.
Be sure to set the containing div to position: relative, in this case .main.
You can't move your child elements positioned in absolute if you don't set your parent element in relative.
Ex.
CSS
.parent{
position:relative;
}
.child{
position:absolute;
left:100px;
}
HTML code
<div class="parent">
<div class="child">Move me</div>
</div>
Resources for more info: http://www.w3schools.com/css/css_positioning.asp

How do I place an image at certain position of a web page?

I want to position an image (basically a logo) at the bottom right side of my page. I am trying to do it using TOP and LEFT. However, that doesn't have any effect. Moreover, I don't want to do absolute positioning but a relative positioning.
P.S: I know you can align towards the right by using align=right. But, is there also something to align to the bottom right?
<body style="height: 100vh; width: 100vw" background="images/background.jpg">
.........
<img src="images/logo.png" alt="logo" style="TOP:235px;LEFT:270px;">
</body>
Relative positioning will only move the element in relation to it's current position as defined by the current layout.
To fix it in relation to the viewport use fixed positioning
#ImSticky {
position: fixed;
bottom: 0;
right: 0;
}
<img id="ImSticky" src="http://www.fillmurray.com/140/100" />
Note:
This element will stay where it is regardless of the amount of content on the page. It won't move up or down when you scroll. Accordingly, this may not be precisely what you actually require.
Note 2:
Positioning is a very poor method of laying out webpages. It is extremely inflexible and there are much better and more responsive options. Check out LearnLayout.com
Hey try this, it has worked for me it will display your logo at right
bottom
<style type="text/css">
.log
{
position:absolute;
right:0;bottom:0;
}
</style>
<div class="log">
<img alt="mylogo" src="c1.png">
</div>
You can use position: fixed that will place an element relative to the viewport.
body {
height: 100vh;
width: 100vh;
margin: 0;
}
.logo {
position: fixed;
bottom: 0;
right: 0;
}
<body>
<img class="logo" src="images/logo.png" alt="logo">
</body>

Issue with putting div over another div

Before giving negative vote or placing the question as duplicate, please read the issue first.
I'm having some issue with putting one div under another. I know that make people have asked this question here and I've read all of them and also tried everything out, but none of them worked for me.
Everyone days to give position: relative to to div and then give one higher z-index and another lower. None of them worked for me. So, I'm here for help.
In my project (http://loadtest.isaumya.com/) I have 2 divs i.e.
<body>
<div class="conteiner">blah blah blah</div>
<div id="particle-js"></div>
</body>
I want to put the <div id="particle-js"></div> behind of container, but nothing is working out. So please help.
You have ordered them badly:
<div class="container">...</div>
<div id="particles-js">...</div>
invert positions:
<div id="particles-js">...</div>
<div class="container">...</div>
makes sense since you want your full-screen canvas particles to be naturally z-index lower than the latter #container. Precedence rule.
also add this styles to your particle-js element:
#particles-js{
position:absolute;
top:0;
width:100%;
height:100%;
}
If the above still does not helps (it should) add:
.container {
position: relative;
z-index: 1;
}
Make your canvas element display:block;
Result image:
its just a very simple concept you need to remember about position in css
A relative positioned element is positioned relative to its normal
position
An absolute position element is positioned relative to the first
parent element that has a position other than static.
JSFiddle
this is how you may solve this problem:
<body>
<div class="container">blah blah blah</div>
<div id="particle-js"></div>
</body>
and the css
div {
width: 100px;
height: 100px;
}
.container {
position: absolute;
background-color: blue;
z-index: 1;
}
#particle-js {
position: absolute;
background-color: red;
}
make the z-index higher to wichever element you want a be displayed at the top

How do I position one image on top of another in HTML?

I'm a beginner at rails programming, attempting to show many images on a page. Some images are to lay on top of others. To make it simple, say I want a blue square, with a red square in the upper right corner of the blue square (but not tight in the corner). I am trying to avoid compositing (with ImageMagick and similar) due to performance issues.
I just want to position overlapping images relative to one another.
As a more difficult example, imagine an odometer placed inside a larger image. For six digits, I would need to composite a million different images, or do it all on the fly, where all that is needed is to place the six images on top of the other one.
Ok, after some time, here's what I landed on:
.parent {
position: relative;
top: 0;
left: 0;
}
.image1 {
position: relative;
top: 0;
left: 0;
border: 1px red solid;
}
.image2 {
position: absolute;
top: 30px;
left: 30px;
border: 1px green solid;
}
<div class="parent">
<img class="image1" src="https://via.placeholder.com/50" />
<img class="image2" src="https://via.placeholder.com/100" />
</div>
As the simplest solution. That is:
Create a relative div that is placed in the flow of the page; place the base image first as relative so that the div knows how big it should be; place the overlays as absolutes relative to the upper left of the first image. The trick is to get the relatives and absolutes correct.
This is a barebones look at what I've done to float one image over another.
img {
position: absolute;
top: 25px;
left: 25px;
}
.imgA1 {
z-index: 1;
}
.imgB1 {
z-index: 3;
}
<img class="imgA1" src="https://via.placeholder.com/200/333333">
<img class="imgB1" src="https://via.placeholder.com/100">
Source
Here's code that may give you ideas:
<style>
.containerdiv { float: left; position: relative; }
.cornerimage { position: absolute; top: 0; right: 0; }
</style>
<div class="containerdiv">
<img border="0" src="https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png" alt=""">
<img class="cornerimage" border="0" src="http://www.gravatar.com/avatar/" alt="">
<div>
JSFiddle
I suspect that Espo's solution may be inconvenient because it requires you to position both images absolutely. You may want the first one to position itself in the flow.
Usually, there is a natural way to do that is CSS. You put position: relative on the container element, and then absolutely position children inside it. Unfortunately, you cannot put one image inside another. That's why I needed container div. Notice that I made it a float to make it autofit to its contents. Making it display: inline-block should theoretically work as well, but browser support is poor there.
EDIT: I deleted size attributes from the images to illustrate my point better. If you want the container image to have its default sizes and you don't know the size beforehand, you cannot use the background trick. If you do, it is a better way to go.
One issue I noticed that could cause errors is that in rrichter's answer, the code below:
<img src="b.jpg" style="position: absolute; top: 30; left: 70;"/>
should include the px units within the style eg.
<img src="b.jpg" style="position: absolute; top: 30px; left: 70px;"/>
Other than that, the answer worked fine. Thanks.
You can absolutely position pseudo elements relative to their parent element.
This gives you two extra layers to play with for every element - so positioning one image on top of another becomes easy - with minimal and semantic markup (no empty divs etc).
markup:
<div class="overlap"></div>
css:
.overlap
{
width: 100px;
height: 100px;
position: relative;
background-color: blue;
}
.overlap:after
{
content: '';
position: absolute;
width: 20px;
height: 20px;
top: 5px;
left: 5px;
background-color: red;
}
Here's a LIVE DEMO
It may be a little late but for this you can do:
HTML
<!-- html -->
<div class="images-wrapper">
<img src="images/1" alt="image 1" />
<img src="images/2" alt="image 2" />
<img src="images/3" alt="image 3" />
<img src="images/4" alt="image 4" />
</div>
SASS
// In _extra.scss
$maxImagesNumber: 5;
.images-wrapper {
img {
position: absolute;
padding: 5px;
border: solid black 1px;
}
#for $i from $maxImagesNumber through 1 {
:nth-child(#{ $i }) {
z-index: #{ $maxImagesNumber - ($i - 1) };
left: #{ ($i - 1) * 30 }px;
}
}
}
Inline style only for clarity here. Use a real CSS stylesheet.
<!-- First, your background image is a DIV with a background
image style applied, not a IMG tag. -->
<div style="background-image:url(YourBackgroundImage);">
<!-- Second, create a placeholder div to assist in positioning
the other images. This is relative to the background div. -->
<div style="position: relative; left: 0; top: 0;">
<!-- Now you can place your IMG tags, and position them relative
to the container we just made -->
<img src="YourForegroundImage" style="position: relative; top: 0; left: 0;"/>
</div>
</div>
The easy way to do it is to use background-image then just put an <img> in that element.
The other way to do is using css layers. There is a ton a resources available to help you with this, just search for css layers.
You could use CSS-Grid, which is a very convenient solution if you want to stack, overlap content. First you need to define your grid. Inside that grid, you "tell" your img-tags where to be places within that grid. If you define them to be at the same start of the grid, they will be overlapped. In the following example two images are overlapped, one is below them.
<div style="display: grid; grid-template-columns: [first-col] 100%; grid-template-rows: [first-row] 300px">
<img src="https://fakeimg.pl/300/" style="grid-column-start: first-col; grid-row-start: first-row">
<img src="https://fakeimg.pl/300/" style="grid-column-start: first-col; grid-row-start: first-row">
<img src="https://fakeimg.pl/300/">
</div>
You can find a very good explanation of CSS-Grid here.
Set background-size cover. Then wrap your div with another div now set max-width on parent div.
<div style="max-width:100px">
<div style="background-image:url('/image.png'); background-size: cover; height:100px; width:100px; "></div>
</div>
Here is a solution that worked for me. Assuming all the images to be stacked are inside a div container, all you need to do is to set the display property of the div to flex. Don't set any position for the first image but for every other image, set the position property to absolute. Finally, use z-index to control the layers. You can set the first image's z-index to 1, the second image's z-index to 2, and so on (In my own case, I set the z-index of every other image apart from the first image to 2). If you want to center the images, you can set the justify-content property of the div to center to align the images horizontally to the center and adjust the top property to align the images vertically to the center. The values you use for the justify-content and top properties depend on the size of your images and whether the sizes are responsive on different devices or not.
Here's my example:
img {
border: 2px solid red;
}
.img1n2 {
display: flex;
justify-content:center;
}
.img1 {
z-index: 1;
}
.img2 {
position: absolute;
z-index: 2;
top: 52.5%;
}
<div class="img1n2">
<img class="img1" src="https://fakeimg.pl/400/">
<img class="img2" src="https://fakeimg.pl/300/" width="100">
<img class="img2" src="https://fakeimg.pl/200/" width="50">
<img class="img2" src="https://fakeimg.pl/50/" width="30">
</div>
You can actually stack a thousand or a million images with this method. You can play around with the CSS to suit your specific needs. Happy coding!
#buti-oxa: Not to be pedantic, but your code is invalid. The HTML width and height attributes do not allow for units; you're likely thinking of the CSS width: and height: properties. You should also provide a content-type (text/css; see Espo's code) with the <style> tag.
<style type="text/css">
.containerdiv { float: left; position: relative; }
.cornerimage { position: absolute; top: 0; right: 0; }
</style>
<div class="containerdiv">
<img border="0" src="http://www.gravatar.com/avatar/" alt="" width="100" height="100">
<img class="cornerimage" border="0" src="http://www.gravatar.com/avatar/" alt="" width="40" height="40">
<div>
Leaving px; in the width and height attributes might cause a rendering engine to balk.
Create a relative div that is placed in the flow of the page; place the base image first as relative so that the div knows how big it should be; place the overlays as absolutes relative to the upper left of the first image. The trick is to get the relatives and absolutes correct.