Hard time writing a simple code on jscript - jscript

I have hard time with this simple jscript for no reason. this code should display the time once clicked. but i get the error below. what am i doing wrong
{
"message": "Uncaught TypeError: Cannot set properties of null (setting 'innerHTML')",
"filename": "https://stacksnippets.net/js",
"lineno": 30,
"colno": 43
}
function item(name)
{
var d = new Date();
document.getElementById("but1").innerHTML = d;
}
<!DOCTYPE html>
<html>
<body>
<script src="C:\Users\kalyanasundar.s\OneDrive - HCL Technologies Ltd\Desktop\proj\animation\index.Js"></script>
<h2>JavaScript Statements</h2>
<p id="demo">You cannot break a code line with a \ backslash.</p>
<button onclick="item(name)">Try it</button>
</body>
</html>


This id (#but1) does not exist, so innerHtml won't work, try changing it.
function item(name) {
var d = new Date();
document.getElementById("demo").innerHTML = d;
}
<!DOCTYPE html>
<html>
<body>
<script src="C:\Users\kalyanasundar.s\OneDrive - HCL Technologies Ltd\Desktop\proj\animation\index.Js"></script>
<h2>JavaScript Statements</h2>
<p id="demo">You cannot break a code line with a \ backslash.</p>
<button onclick="item(name)">Try it</button>
</body>
</html>

Related

How to escape '-' hyphen symbol from xml in MathJax

<!DOCTYPE html>
<html>
<head>
<title>MathJax MathML Test Page</title>
<script type="text/javascript" id="MathJax-script" async
src="https://cdn.jsdelivr.net/npm/mathjax#3/es5/mml-chtml.js">
</script>
</head>
<body>
<p>
<math overflow="scroll"><mfrac><msup><msub><mi mathvariant="-italic">Q</mi><mrow><msub><mi mathvariant="italic">T</mi><mi mathvariant="italic">i</mi></msub><mo mathvariant="italic">max</mo></mrow></msub><mn mathvariant="normal">0.75</mn></msup><msup><mi mathvariant="italic">β</mi><mn mathvariant="normal">0.75</mn></msup></mfrac><mo>≤</mo><mn mathvariant="normal">5</mn><mo>×</mo><msub><mi mathvariant="italic">AEL</mi><msub><mi mathvariant="italic">T</mi><mi mathvariant="italic">i</mi></msub></msub><mo>×</mo><msup><msub><mi mathvariant="italic">Q</mi><msub><mi mathvariant="italic">T</mi><mi mathvariant="italic">m</mi></msub></msub><mrow><mo>−</mo><mn mathvariant="normal">0.25</mn></mrow></msup><mo></mo></math>
</p>
</body>
</html>
Getting parsing error with new CDN https://cdn.jsdelivr.net/npm/mathjax#3/es5/mml-chtml.js

Here is a configuration you can use to post-filter the MathML to fix the invalid -italic math variant value.
MathJax = {
startup: {
ready() {
MathJax.startup.defaultReady();
MathJax.startup.input[0].postFilters.add(({data}) => {
data.walkTree(node => {
if (node.attributes) {
if (node.attributes.get('mathvariant') === '-italic') {
node.attributes.set('mathvariant', 'italic');
}
}
});
});
}
}
}
Place this in a <script> tag just before the script that loads mml-html.js.

Simple SVG project cause error on Internet Explorer 11

I am learning svg and would like to compare displaying svg items on different browsers. My code works fine on firefox, chrome, edge, safari etc, but cannot work on ie11. Unfortunately application I develop needs to support ie11 so I need to force my code to work correctly.
Here is fiddle: https://jsbin.com/hemawaboqa/1/edit?html,js,output
HTML
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/#svgdotjs/svg.js"></script>
</head>
<body>
<div style="position:absolute;left:0px;top:0px;right:0px;bottom:0px;overflow:hidden;" id="svg-main-container">
<div style="position:absolute;left:0px;top:0px;bottom:0px;right:300px;border:1px solid #dadada;overflow:auto;" id="svg-canvas"></div>
</div>
</body>
</html>
JS
var draw = SVG().addTo('#svg-canvas').size(400, 400)
var rect = draw.rect(100, 100)
Why that code is not working on ie11?

I have created a sample using the SVG.js 3.0 version with your code, it will show the "Object doesn't support property or method 'from'" in IE11 browser, perhaps the issue is related to the svg.js version, and it is a plugin issue, you could feedback this issue to SVG.js forum.
Besides, I suggest you could refer to the following code, to use the old version of SVG.js:
<!DOCTYPE html>
<html lang=en-us>
<head>
<meta charset=utf-8>
<title>TEST</title>
</head>
<body>
<div style="position:absolute;left:0px;top:0px;right:0px;bottom:0px;overflow:hidden;" id="svg-main-container">
<div style="position:absolute;left:0px;top:0px;bottom:0px;right:300px;border:1px solid #dadada;overflow:auto;" id="drawing">
</div>
</div>
<script src=https://cdnjs.cloudflare.com/ajax/libs/svg.js/2.6.6/svg.min.js></script>
<script>
(function () {
'use strict';
// Add title as first child of SVG element:
var createTitle = function (svgObject, text) {
var fragment = document.createDocumentFragment();
var titleElement = document.createElement('TITLE');
fragment.appendChild(titleElement);
titleElement.innerHTML = text;
svgObject.node.insertAdjacentElement('afterbegin', titleElement);
};
SVG.extend(SVG.Doc, {
namespace: function () {
return this
.attr({xmlns: 'http://www.w3.org/2000/svg', version: '1.1'})
.attr('xmlns:xlink', SVG.xlink, SVG.xmlns);
}
});
var draw = new SVG('drawing').size(300, 300);
var rect = draw.rect(100, 100).attr({fill: '#f06'});
// Add title to SVG element
createTitle(draw, 'Rectangle');
}());
</script>
</body>
</html>
The result as below:

The library you are using has ECMA 6 elements that are not understood in IE.
If you need your project to work in IE, you will have to use another library or find out how to change it so it allows for older browsers (as suggested here: https://svgjs.dev/docs/3.0/compatibility/)

Popup.js toggle button typeError

I'm trying to replicate this jsfiddle and add a toggle on/off button to my popup in my chrome extension.
popup.html
<!DOCTYPE html>
<html>
<head>
<script src="popup.js"></script>
</head>
<body>
<button id="toggle">OFF</button>
</body>
</html>
popup.js
console.log("popup.js running..")
var button = document.getElementById('toggle');
var isToggled = false;
button.onclick = function(e){
isToggled = !isToggled;
// Your code here
button.innerText = isToggled ? 'ON' : 'OFF';
};
My error:
Uncaught TypeError: Cannot set property 'onclick' of null
why do I get this error on the bottun.onclick? How can I fix this?

Bokeh is not generating plot and is instead returning an HTML file

I am new to Python and was trying out the Bokeh library. I try to plot a basic line graph and instead of returning the graph I get an ouput HTML file. When I ran the HTML code it looks like the graph does generate. Does anyone have any idea why the show() method is not showing me the chart as expected. I tried this in both Jupyter Notebook as well as Atom and both return the HTML code. I am running Windows 7 as well.
My code:
from bokeh.plotting import figure
from bokeh.io import output_file , show
x=[1,2,3,4,5]
y=[6,7,8,9,10]
output_file("test1.html")
f=figure()
f.line(x,y)
show(f)
Returned HTML file:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Bokeh Plot</title>
<link rel="stylesheet" href="https://cdn.bokeh.org/bokeh/release/bokeh-0.13.0.min.css" type="text/css" />
<script type="text/javascript" src="https://cdn.bokeh.org/bokeh/release/bokeh-0.13.0.min.js"></script>
<script type="text/javascript">
Bokeh.set_log_level("info");
</script>
</head>
<body>
<div class="bk-root" id="d48bbd43-55c8-4727-befa-468754bdb0b5"></div>
<script type="application/json" id="41bd10a1-5a61-4504-80f1-8c56f40e644b">
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</script>
<script type="text/javascript">
(function() {
var fn = function() {
Bokeh.safely(function() {
(function(root) {
function embed_document(root) {
var docs_json = document.getElementById('41bd10a1-5a61-4504-80f1-8c56f40e644b').textContent;
var render_items = [{"docid":"c99a857f-320f-48ba-8576-3ef2bd47c6ce","roots":{"4da3e749-cdb4-48ed-8dc6-b78818d8f587":"d48bbd43-55c8-4727-befa-468754bdb0b5"}}];
root.Bokeh.embed.embed_items(docs_json, render_items);
}
if (root.Bokeh !== undefined) {
embed_document(root);
} else {
var attempts = 0;
var timer = setInterval(function(root) {
if (root.Bokeh !== undefined) {
embed_document(root);
clearInterval(timer);
}
attempts++;
if (attempts > 100) {
console.log("Bokeh: ERROR: Unable to run BokehJS code because BokehJS library is missing")
clearInterval(timer);
}
}, 10, root)
}
})(window);
});
};
if (document.readyState != "loading") fn();
else document.addEventListener("DOMContentLoaded", fn);
})();
</script>
</body>
</html>

Yes that will happen but is easy to resolve :
right click the (output html file) in working folder ---> hover over open with----> choose default program---> click on always open with (google chrome)
Now the next time you run your code plot will open up in chrome instead of .html file in notepad

YUI CustomEvent no errors being reported

Does anyone know how to get the below to report a javascript error? (any browser)
<head>
<title></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/yui/2.6.0/build/yahoo-dom-event/yahoo-dom-event.js">
</script>
<script type="text/javascript">
ObjWithEvent = {
testEvent: new YAHOO.util.CustomEvent("testEvent")
};
ObjSubscriber = {
handleTestEvent: function(){
alert('the next line will not show up in the error console');
not_a_valid_function_bro();
}
};
ObjWithEvent.testEvent.subscribe(ObjSubscriber.handleTestEvent);
ObjWithEvent.testEvent.fire();
</script>
</head>
<body>
</body>

Possibly one of the worst chosen default settings ever.....
YAHOO.util.Event.throwErrors is set to false by default, so if you want to see errors:
YAHOO.util.Event.throwErrors = true;

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