The useage of circles.js in the html - javascript

I'm now make a some circle in the html. however I can't handle circles.js library.
Library URL : https://github.com/lugolabs/circles
My source code is below.
<!doctype html>
<html>
<head>
<script src="circles.js"></script>
<script>
Circles.create({
id: 'circles-1',
percentage: 43,
radius: 60,
width: 10,
number: 7.13,
text: '%',
colors: ['#D3B6C6', '#4B253A'],
duration: 400
})
</script>
</head>
<body>
<div id="canvas">
<div class="circle" id="circles-1"></div>
</div>
</body>
</html>
Actually, I didn't learn how to use the javascript in the html. So I was in a trouble by using javascript. how know solve that? or give advices to study the javascript?

Related

Why isn't the javascript in my html working?

I'm running it in vscode and when I run my site, the spot where the javascript should be, is just a blank area. I tried a console.log message to test it and that isn't coming through either.
Here's where I'm trying to add a progress bar.
<p class="infoBox">
<h3>Skills</h3>
<h4>Computer Languages</h4>
Java <div id="container"></div></br>
Python</br>
Here's my javascript.
<script type="text/javascript" src="/require.js">
console.log("Hello World!"); // a test for js and it's not showing up in chrome's console
var ProgressBar = require('progressbar.js');
var bar = new ProgressBar.Line(container, {
strokeWidth: 4,
easing: 'easeInOut',
duration: 1400,
color: '#FFEA82',
trailColor: '#eee',
trailWidth: 1,
svgStyle: {width: '100%', height: '100%'}
});
bar.animate(1.0);
</script>
Here's my css.
#container {
margin: 20px;
width: 400px;
height: 8px;
}
Here's what's coming up when I run it.
You mixed something up. if you use <script src=""></script> you tell the browser to import a js library (in your case require.js). The contents between <script> and </script> are then ignored.
If you want to execute javascript code you have two options.
Option 1: Inline Javascript like this:
<script src="require.js"></script>
<script>
console.log("test")
</script>
Option 2: Create your own .js file and extract the code there:
<script src="require.js"></script>
<script src="your_own_js_file.js"></script>
If src is in the tag it will not read its contents. Simply remove the src and it should work.
According to your source variable container is undefined, so you try to set the progress bar to an empty container. So either assign value '#container' to your variable or just replace new ProgressBar.Line(container, with new ProgressBar.Line("#container",
And yes, you need to split and your script like
<script src="/require.js"/>
<script>
Your script here
</script>
Since you are using the id of the div element to render the progress bar, you need to load the javascript code after the window is loaded.
index.js
window.onload = function onLoad() {
var bar = new ProgressBar.Line(container, {
strokeWidth: 4,
easing: 'easeInOut',
duration: 1400,
color: '#FFEA82',
trailColor: '#eee',
trailWidth: 1,
svgStyle: { width: '100%', height: '100%' },
});
bar.animate(1.0);
};
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<title>ProgressBar.js - Minimal Example</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
#container {
margin: 20px;
width: 400px;
height: 8px;
}
</style>
</head>
<body>
<p class="infoBox"></p>
<h3>Skills</h3>
<h4>Computer Languages</h4>
<p>Java</p>
<div id="container"></div>
<p>Python</p>
<script src="https://cdn.rawgit.com/kimmobrunfeldt/progressbar.js/0.5.6/dist/progressbar.js"></script>
<script src="index.js"></script>
</body>
</html>

jsPDF generates empty pdf only

I am working with jsPDF to create a PDF from my HTML. However, it always generates an empty page doesn't matter which HTML content I enter as the source.
Here is my code:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Save HTML TO PDF</title>
</head>
<body>
<div><button id="cmd">download as PDF</button></div>
<div id="content">Hello</div>
<script src="https://unpkg.com/jspdf#latest/dist/jspdf.min.js"></script>
<script src="https://html2canvas.hertzen.com/dist/html2canvas.min.js"></script>
<script type="text/javascript">
document.getElementById("cmd").addEventListener("click", function () {
window.html2canvas = html2canvas;
var doc = new jsPDF("p", "pt", "a4");
doc.html(document.getElementById("content"), {
callback: function(pdf) {
pdf.save("cv-a4.pdf");
}
});
});
</script>
</body>
</html>
What am I doing wrong? In my opinion that matches exactly the documentation. However, as stated above, the pdf generated does not show any content and not the "Hello". ( I took some of the code from this StackOverflow question)
#threxx
Try this code :
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Save HTML TO PDF</title>
</head>
<body>
<div><button id="cmd">download as PDF</button></div>
<div id="content">
<h1 style="color: brown;">Hello, He/She..</h1>
<p style="color: green;">How Are you ??</p>
Thank you.
</div>
<script src="https://unpkg.com/jspdf#latest/dist/jspdf.min.js"></script>
<script src="https://html2canvas.hertzen.com/dist/html2canvas.min.js"></script>
<script type="text/javascript">
document.getElementById("cmd").addEventListener("click", function () {
var doc = new jsPDF("p", "pt", "a4");
var source = window.document.getElementById('content').innerHTML;
doc.fromHTML(source, 30, 30);
doc.save("cv-a4.pdf");
});
</script>
</body>
</html>
I hope above code will be useful for you.
Thank you.
So after doing some more research I found this answer which will return a PDF from the HTML. Small problem: still only very poor CSS styles but afaik jspdf doesn't support custom CSS.
<script src="https://unpkg.com/jspdf#latest/dist/jspdf.min.js"></script>
<script src="https://html2canvas.hertzen.com/dist/html2canvas.min.js"></script>
<script type="text/javascript">
document.getElementById("cmd").addEventListener("click", function () {
var doc = new jsPDF("p", "pt", "a4");
var source = document.body;
var margin = {
top: 20,
left: 20,
right: 20,
bottom: 20
};
doc.fromHTML(source, 30, 30, {
'width': 80, // max width of content on PDF
},
function(pdf){doc.save('saveInCallback.pdf');},
margin
);
});
</script>

jQuery Sparklines more the one graph

I am trying to show two spark line graphs using jQuery Sparklines but for some reason i only shows me one, this is my code:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script src="jquery.sparkline.min.js"></script>
</head>
<body>
<div id="graphs">
<span id="sparkline"></span>
<br>
<span id="sparkline2>"></span>
</div>
</body>
<script>
$("#sparkline").sparkline([74.82290216,
74.82290216,
48.70129726,
70.77921869,
72.07791995,
69.15584211,
74.05548778,
76.91853079,
70.24792886,
80.34237956], {
type: 'line',
width: '100',
height: '50'
});
$("#sparkline2").sparkline([74.82290216,
74.82290216,
48.70129726,
70.77921869,
72.07791995,
69.15584211,
74.05548778,
76.91853079,
70.24792886,
80.34237956], {
type: 'line',
width: '100',
height: '50'
});
</script>
</html>
As you can see i have two spans with two different id's and still i get only the first one.
I even tried to load to the same span but it makes no difference.
Thanks

I am unable to implement JCanvas

I am new to learn JCanvas. I am trying to implement a simple JCanvas program.
Here is my code:
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"> </script>
<script src='jcanvas.min.js'></script>
</head>
<body>
<canvas id="drawingCanvas" width="500" height="500" style="border:1px solid black;align:center;"></canvas>
<script>
var canvas = document.getElementById("drawingCanvas");
var ctx = canvas.getContext("2d");
$('canvas').drawArc({
strokeStyle: 'green',
draggable: true,
x:100, y:100,
radius: 50
});
</script>
</body>
</html>
But I am unable to Implement the above.
The Circle I am trying to draw here is not getting displayed on the canvas.
What Am I doing wrong?
Looks like your code is quite fine itself. Consider wrapping your code in $(document).ready(function () {});, like this:
<script>
$(document).ready(function () {
$('canvas#drawingCanvas').drawArc({
strokeStyle: 'green',
draggable: true,
x:100, y:100,
radius: 50
});
});
</script>
This guarantees that your code will executed when the whole DOM structure is loaded in browser memory and ready to interact with JavaScript. See jQuery docs for more details.
I've also created jsFiddle, where your code just works. I attached the jCanvas using URL from here, so it might stop working occasionally.
UPDATE: removed unused variables from the code, added id to jQuery selector.
UPDATE2: Without jsFiddle, it should look like that
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta charset="utf-8">
<title>Sample</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script type="text/javascript" src="http://calebevans.me/projects/jcanvas/resources/jcanvas/jcanvas.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$('canvas#drawingCanvas').drawArc({
strokeStyle: 'green',
draggable: true,
x:100, y:100,
radius: 50
});
});
</script>
</head>
<body>
<canvas id="drawingCanvas" width="500" height="500" style="border:1px solid black;align:center;"></canvas>
</body>
</html>
UPDATE3: Please do not use jCanvas attaching like in the sample above, the link was grabbed from jCanvas showroom and is not supposed to be reliable CDN. It might be changed or removed, and it might not be ready to high load.
there are probably other ways, but this works. I sourced jCanvas and jQuery internally
<!DOCTYPE html>
<html>
<head>
<script src="jquery.js"></script>
<script src='jcanvas.min.js'></script>
<script>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
function init(){
$("canvas").drawArc({
strokeStyle: 'green',
draggable: true,
x:100, y:100,
radius: 50
});
}
</script>
</head>
<body onload="init()">
<canvas id="canvas" width="500" height="500" style="border:1px solid black;align:center;"></canvas>
</body>
</html>

Why is document.getElementById returning a null value?

I've debugged my code and realized that a method in my Javascript isn't working properly. Anyone have an idea why?
index.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Tetris</title>
<link rel="stylesheet" href="css/app.css">
<script type="text/javascript" src="js/main.js"></script>
</head>
<body>
<canvas id="tetrisBoard" width="800" height="600">
Your browser does not support HTML 5.
</canvas>
<p>
</p>
</body>
</html>
main.js:
board = document.getElementById("tetrisBoard")
ctx = board.getContext("2d")
ctx.fillStyle = "rgb(200, 0, 0)"
ctx.fillRect 10, 10, 55, 50
The result of document.getElementById("tetrisBoard") is a null value. Why?
Because you're calling your code prior to the elements existing. Put the script right before the closing body tag and you'll be fine.
Another solution is to do something like this:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Tetris</title>
<link rel="stylesheet" href="css/app.css">
<script type="text/javascript" src="js/main.js"></script>
</head>
<body onload="setup();">
<canvas id="tetrisBoard" width="800" height="600">
Your browser does not support HTML 5.
</canvas>
<p>
</p>
</body>
</html>
Then, in your main.js use something like this:
function setup() {
// Your code here
}
The good thing about this is that you don't have to put the script tag in an unintuitive and unstandard spot (such as right before the end of the body).
Also you could make the script to wait until all the DOM it is loaded... like this:
using jquery
$(document).ready(function(){
board = document.getElementById("tetrisBoard")
ctx = board.getContext("2d")
ctx.fillStyle = "rgb(200, 0, 0)"
ctx.fillRect 10, 10, 55, 50
});
vanilla JavaScript:
document.addEventListener("DOMContentLoaded", function () {
board = document.getElementById("tetrisBoard")
ctx = board.getContext("2d")
ctx.fillStyle = "rgb(200, 0, 0)"
ctx.fillRect 10, 10, 55, 50
}, false);

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