Using Text With The Trianglify Javascript Library - javascript

So I've been using the Trianglify library and I've been loving it. My only problem is the way it handles text: it pushes it all to the top, whereas I want the randomly generated background to act as the background, with the text on it. Here's my code so far:
<script>
var pattern = Trianglify({
height: window.innerHeight,
width: window.innerWidth,
cell_size: 40});
document.body.appendChild(pattern.canvas())
</script>
and
<div class="container-fluid" id="welcome">
<div class="row">
<div class="col-md-6 col-md-offset-3">
<h1> Welcome to the website </h1>
</div>
</div>
</div>
Please help! Thanks so much for your time.

I just came across this question because I have the same issue. Here's what I did.
HTML
<canvas id="container1"></canvas>
<script>
var pattern = Trianglify({cell_size: 25, x_colors: 'Blues'});
pattern.canvas(document.getElementById('container1'));
</script>
<div class="screen-container trianglify-container">
<div class="container">
<div class="row">
<h3>This is where my text goes</h3>
</div>
</div>
</div>
CSS
.trianglify-container {
background-color: transparent;
color:#fff;
text-align: center;
padding-top: 20vh;
}
canvas#container1 {
position: absolute;
width: 100vw;
height: 100vh;
}
Explanation
I am using Bootstrap, hence the container and row divs in the HTML.
Setting the canvas#container1 to an absolute position fixes it and everything that follows in the HTML should come over it. Setting width to 100vw and height to 100vh ensures it takes up the whole screen.
Setting the trianglify-container position to relative ensures it shows up relative to any fixed or absolute objects above it, in this case the canvas. Using padding let's you move where you want the text.
If I wanted everything else on the page always to have the same trianglify background, I could do:
canvas#container1 {
position: absolute;
width: 100vw;
height: 100vh;
}

Related

Include my Javascript animation on all the html body so it stays while scrolling the page

Hi i'm learning html/css and javascript and I think I'm having an issue with my html structure. Basically what I want to do is that my particles animation stays on the website while scrolling the page. I have a Javascript file that does a getElementById('particles') to run the canvas on a div but it only stays on the first page.
I tried to move the "particles" div as a main div that will contain all the sections but it didn't work.
Here's the repository of the files if anyone is interested: https://github.com/DanielVillacis/DanielVillacis.github.io
Here's my html structure :
document.addEventListener('DOMContentLoaded', function() {
particleground(document.getElementById('particles'), {
dotColor: '#FFFFFF',
lineColor: '#FFFFFF'
});
var intro = document.getElementById('intro');
intro.style.marginTop = -intro.offsetHeight / 2 + 'px';
}, false);
html,
body {
width: 100%;
height: 100vh;
}
canvas {
display: inline-block;
vertical-align: baseline;
}
header,
section {
display: block;
}
#particles {
width: 100%;
height: 100vh;
overflow: hidden;
position: relative;
}
.container {
scroll-snap-type: y mandatory;
overflow-y: scroll;
height: 100vh;
}
section {
height: 100vh;
width: 100%;
display: inline-block;
scroll-snap-align: start;
}
<body>
<div class="container">
<main role="main">
<section class="intro">
<div id="particles">
<header class="splash" id="splash" role="banner">
<div id="intro">
</div>
</header>
</div>
</section>
<section class="AboutMe">
<div class="introduction">
</div>
</section>
<section class="box">
<div class="projectContainer">
</div>
</section>
<section class="Contact">
<h2 class="ContactTitle">Contact</h2>
<div class="contactLinks">
</div>
</section>
</main>
</div>
</body>
Use the CSS position: fixed; property.
With position set to fixed, your canvas is positioned relative to the viewport and hence would remain even while scrolling.
.pg-canvas {
display: block;
position: fixed;
top: 0;
left: 0;
pointer-events: none;
width: 100%;
height: 100vh;
}
You have put the particles (which are shown on a canvas) into a section which will scroll out of view.
The particles library you are using places this canvas just before the element you have given it, which has id particles.
You can fix just the canvas by adding position: fixed to the canvas selector in your style sheet (watch out if you have other canvases to give a more definite selector).
This will work in many cases to fix the canvas with the particles to the viewport. But note this description from MDN
The element is removed from the normal document flow, and no space is
created for the element in the page layout. It is positioned relative
to the initial containing block established by the viewport, except
when one of its ancestors has a transform, perspective, or filter
property set to something other than none (see the CSS Transforms
Spec), in which case that ancestor behaves as the containing block.
(Note that there are browser inconsistencies with perspective and
filter contributing to containing block formation.) Its final position
is determined by the values of top, right, bottom, and left.
You are OK at the moment because you move intro with top but if that were a translate you’d have to put the canvas out of intro.

scrollIntoView() is not working: does not taking in account fixed element

I'm trying to use scrollIntoView() in my application, but because I have a top fixed bar, when I use the scrollIntoView(), the elements will be scroll to the fixed bar back.
This means that when I try to put some element visible to the user, by scrolling the element to a visible area, it will be scrolled, but to another invisible ate that is were this fixed bar is.
Follows an example of what I'm trying to do:
let element = document.getElementsByClassName('second-element')[0];
element.scrollIntoView();
.fixed-element{
height: 30px;
width: 100%;
background-color:black;
position:fixed;
}
.parent-element {
width: 100%;
height: 40000px;
background-color:blue;
}
.element {
width: 100%;
height:100px;
background-color: yellow;
margin-top:10px;
}
.second-element{
width: 100%;
background-color: red;
height:200px;
}
<div class="fixed-element"></div>
<div class='parent-element'>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='second-element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
<div class='element'></div>
</div>
There is any way that I could use this function in a way that the scroll elements not became invisible because of the fixed bar?
I would like a vanilla JavaScript solution. Also, and only if it is possible, a solution that doesn't need to know the existent of any fixed elements.
You can make the window scrollTo x position 0 and y position the element's offsetTop subtracted by the fixed element's offsetHeight.
JSFiddle with your code: http://jsfiddle.net/3sa2L14k/
.header{
position: fixed;
background-color: green;
width: 100%;
top: 0;
left: 0;
right: 0;
}
html, body{
height: 1000px;
}
#toBeScrolledTo{
position: relative;
top: 500px;
}
<div class="header">
Header
</div>
<div id="toBeScrolledTo">
Text Text Text
</div>
<script>
window.scrollTo(0, document.getElementById('toBeScrolledTo').offsetTop - document.getElementsByClassName('header')[0].offsetHeight);
</script>
Your question is answered in this link.
var node = 'select your element';
var yourHeight = 'height of your fixed header';
// scroll to your element
node.scrollIntoView(true);
// now account for fixed header
var scrolledY = window.scrollY;
if(scrolledY){
window.scroll(0, scrolledY - yourHeight);
}
Also you can use this way:
let item = // what we want to scroll to
let wrapper = // the wrapper we will scroll inside
let count = item.offsetTop - wrapper.scrollTop - xx // xx = any extra distance from top ex. 60
wrapper.scrollBy({top: count, left: 0, behavior: 'smooth'})
Source: https://github.com/iamdustan/smoothscroll/issues/47
A great simple solution (inspired by Sanyam Jain's comment in this link) is to use {block: 'center'} to vertically center the selection like this:
scrollIntoView({block: 'center'})
Edit - I sadly found on MDN page that this features is 'experimental - should not be used in production'. Also, IE doesn't support it (if that's a need).
Try scroll padding. It is not a JavaScript solution (it is a CSS property) but it can be helpful with your problem.
MDN
CSS Tricks
This is 2021, so you could solve this by just using scroll-margin-top. It exists for this express purpose!

Inverse direction of jQuery UI resizable

I have a floating sidebar which is located on the right of the page which I want to be able to resize using a handle on the left of the container.
At the moment, when I drag the sidebar using the handle, it makes the sidebar wider when dragging right, and smaller when dragging left - I wan't it to do the inverse of this. i.e., dragging to the left increases the size of the sidebar etc..
I would prefer to not change the html structure and hopefully have a simple line of javascript to fix the problem - please help!
Here is a fiddle: https://jsfiddle.net/c01gat3/us8vktjq/
html
<div id="sidebar">
<div id="drag">
</div>
</div>
css
#sidebar{
position: absolute;
top: 0;
right: 0;
width: 200px;
height: 100% !important;
background-color: blue;
}
#drag{
position: absolute;
left: -10px;
width: 10px;
height: 100%;
background-color:black;
cursor:ew-resize;
}
Javascript
$('#sidebar').resizable({
minWidth: 100,
handles: { "w" : $("#drag") }
});
You're missing the associated CSS file.
Add the following reference to your HTML page:
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
Adjust your HTML code to include the needed classes:
<div id="sidebar">
<div id="drag" class="ui-resizable-handle ui-resizable-w">
</div>
</div>
Working fiddle here: https://jsfiddle.net/us8vktjq/2/
Read more here: http://api.jqueryui.com/resizable/#option-handles

How to position a div above another div?

My code is:
HTML:
<section>
<div id="banner">
<div class="container">
<p class="para">hello world</p>
</div>
<div class="container banner-bottom">
<div class="card card-primary text-center z-depth-2 contact-main-text">
<div class="card-block">
<p class="white-text">Please fill out the form below and ESC
staff will be in contact with you shortly.</p>
</div>
</div>
</div>
</div>
</section>
CSS:
.para{
color:white;
background: red;
padding:70px;
text-align:center;}
.white-text{
background:green;
padding:20px;}
Output is: Bootply
And i want:
Could anyone help me with that?
You can set negative top margin to overlay the second div, see the live example:
<div class="container banner-bottom" style="margin-top:-5%;padding:2%">
http://www.bootply.com/MorC45NB4V
PS: I have used inline css just to show, avoid inline css.
My solution uses jQuery and some calculations. My calculation works even if you move the elements around the document. I also used CSS for the margins you wanted.
jQuery
//location of bottom of the red container
var bottomOfContainer = $('#onTopOfMe').offset().top + $('#onTopOfMe').height();
//gets the bottom 4th of the red container
var placement = bottomOfContainer - ($('#onTopOfMe').height() / 4);
//setter of top for green container
$('#placeMe').offset({"top": placement});
CSS
p.white-text{
margin-left:5%;
margin-right:5%;
}
Output
bootply
1) In case you want your lower banner to have a full width:
You could add position: relative; to the lower banner and position it adding a bottom value and use margin to create the same visual effect asked in the question.
.banner-bottom {
position: relative;
bottom: 45px;
margin: 0 40px;
}
2) In case you don't need to have a banner with full width and just center it, then no need to use margins. Remember to set one parent as position: relative;:
#banner { position:relative;}
.banner-bottom {
position: absolute;
top:75%;
right:0;
bottom:auto;
left:0;
}
CODEPEN
http://codepen.io/alexincarnati/pen/PWOPjY
Here's my solution for this.
Basically just make the position of the card block "relative", position the "top" position accordingly, then set the margin to "auto" to center it.
.card-block {
position: relative;
top: -50px;
margin: auto;
width: 80%;
}
A bit of position could help you, here's a rough version that will hopefully get you thinking what you need to do:
#banner { position:relative;}
.banner-bottom { position: absolute; top:75%;right:0;bottom:auto;left:0; }
Heres a forked bootply: http://www.bootply.com/Imuh4wUj50

HTML content after (under) canvas element

I am using this code http://cssdeck.com/labs/pa0yqlki that displays a canvas covering the size of the browser's window.
I am able to display content on top of the canvas (by using absolute positioning and z-index: -1)
What I am not able to do is add content AFTER the canvas.
Once the canvas ends, and so does the window, I want to have an <h1> lets say. So a scroll bar should appear when the page is loaded I should be able to scroll a bit more so that I see the <h1>.
Any ideas?
Okay, thanks to markE's reply I was able to achieve what I wanted.
[...] <canvas> </canvas>
<h1 id="myText"> Text </h1> [...]
this is the part of my HTML. The "myText" will be displayed under the canvas based on the size of the window.
To achieve that I added the following code in the CSS.
#myText
{
padding-top: 100vh;
}
You can achieve this with playing with CSS positions;
Try something like this:
<div>
<canvas width="300" height="200" class="custom-canvas" />
<div class="text">
<div class="main">20 %</div>
<div class="head">Completed</div>
</div>
</div>
SCSS:
.custom-canvas{
position: relative;
clear: both;
width: 450px;
height: 200px;
}
.custom-canvas {
.text {
bottom: 13px;
position: absolute;
left: 6px;
right: 0;
text-align: center;
}
.head {
margin-top: 14px;
}
}
Play with left,right,top and bottom to achieve the exact position.

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