I am a beginner to javascript. I am currently learning it.
HTML:
<!DOCTYPE html>
<html>
<head>
<title>Using Javascript</title>
<meta http-equiv="author" content="#infinity">
<link rel="stylesheet" type="text/css" href="css.css">
</head>
<body>
<h1>Elderflower</h1>
<script src="javascript.js"></script>
<div id="content">
<h2>Custom Signage</h2>
<div id="cost">Cost: $5 per tile</div>
</div>
</body>
</html>
Javascript:
var number;
var costOne;
var totalCost;
number=5;
costOne=2;
totalCost=number*costOne;
var el=document.getElementById('cost');
el.textContent=totalCost;
Now I think that this should work, but its not working. The text of the <div id="cost"> remains same.
Please help.
Most likely you are trying to update the DOM even before it is loaded - you can make sure the javascript is executed after the DOM is loaded by keeping JS at the end of the body tag like below -
<!DOCTYPE html>
<html>
<head>
<title>Using Javascript</title>
<link rel="stylesheet" type="text/css" href="css.css">
</head>
<body>
<h1>Elderflower</h1>
<div id="content">
<h2>Custom Signage</h2>
<div id="cost">Cost: $5 per tile</div>
</div>
<script>
var number;
var costOne;
var totalCost;
number=5;
costOne=2;
totalCost=number*costOne;
var el=document.getElementById('cost');
el.textContent=totalCost;
</scirpt>
</body>
</html>
Start reading from here about Window load vs DOM load events
Related
I am new for html, javascript, and katex. I wonder if you could tell me why the following simple html does not show the equation.
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex#0.16.3/dist/katex.css"
integrity="sha384-yW1frltt4cd2K6QCmOMx4M+ylOmyrGb+NDouZ1f5VL2f4NN7uBu5PQsmUSgWib1W" crossorigin="anonymous">
<script defer src="https://cdn.jsdelivr.net/npm/katex#0.16.3/dist/katex.js"
integrity="sha384-ZfxPSr1+NHNHrv9KI48JF/1RkvdoxKWJPuYyfxE+iexlsGw8tyQR4OuNVNUuzwLN"
crossorigin="anonymous"></script>
<title>My app</title>
</head>
<body>
<span id="idequ">equation</span>
<script>
katex.render("f(a,b,c) = (a^2+b^2+c^2)^3", document.getElementById("idequ"));
</script>
</body>
I am trying to get an HTML element from 2 different html files. The problem is I only get one of them.
var message1 = document.getElementById("message1") works.
But when I try to do the same for the element in the other html page:
var message2 = document.getElementById("message2") it returns null
I have a main html file (index.html):
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>repl.it</title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<p id = "message1">I hate the post office</p>
<script src="script.js"></script>
</body>
</html>
And I also have another html file (page2.html):
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>repl.it</title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<p id = "message2">Random sentence</p>
<script src="script.js"></script>
</body>
</html>
And finally I have a javascript file (script.js):
//Gets message1 from index.html (works)
var message1 = document.getElementById("message1")
//logs message1 from index.html (works)
console.log(message1)
//gets message2 from page2.html (doesn't work)
var message2 = document.getElementById("message2")
//logs message2 from page2.html (logs null)
console.log(message2)
How do I get the elements of id message and message2 in script.js?
I try this another way using iframe. Add in index.html page
<p id="message">I hate the post office</p>
<iframe src="page2.html" frameborder="0" style="display: none;"></iframe>
<script src="script.js"></script>
I made an HTML document with a button that when I click were to it display a prompt that modify a p tag.
Probably, I made a dumb error of code syntax(I am beginner in js).
Help me and explain please.
<DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"/>
<link rel="stylesheet" type="text/css" href='calendar.css'/>
<script type="text/javascript">
function name(x){
var x = prompt("Enter the month name","Ex. January");
document.getElementById("month_name").innerHTML = x;
}
</script>
<title>:)</title>
</head>
<body>
<div class="title_Month">
<button onclick="name()" class="title" >Change the month displayed</button>
<p id="month_name"></p>
</div>
</body>
</html>
name is reserved in javascript.
You should avoid using the name of JavaScript built-in objects, properties, and methods
https://www.w3schools.com/js/js_reserved.asp
<DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"/>
<link rel="stylesheet" type="text/css" href='calendar.css'/>
<script type="text/javascript">
function names(){
var x = prompt("Enter the month name","Ex. January");
document.getElementById("month_name").innerHTML = x;
}
</script>
<title>:)</title>
</head>
<body>
<div class="title_Month">
<button onclick="names()" class="title" >Change the month displayed</button>
<p id="month_name"></p>
</div>
</body>
</html>
I am very new to web development. I am trying to use jquery to show slider on the web-page. However, I am not able to see the silder on the web-page. I tried debugging the code via. firebug. However, I don't see any error over there. Can somebody please tell me on what I am missing possibly?
I am using Linux - Fedora core 16 and Firefox- 38.0.5 to run this code
index.html
<!DOCTYPE html>
<html>
<script src= "jquery-2.1.4.min.js"> </script>
<script src= "js/jquery-ui.js"> </script>
<script src= "js/jqueryTutorial.js"> </script>
<title> "My Page"</title>
<head> "Hello Jquery"</head>
<body>
<div id="slider"> </div>
</body>
</html>
Here is the jqueryTutorial.js file.
(function() {
$("#slider").slider();
})();
There are no errors in the firebug console.
Here is the screen shot.
Finally, I did the following from the source - jquery slider
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI Slider - Default functionality</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<script>
$(function() {
$( "#slider" ).slider();
});
</script>
</head>
<body>
<div id="slider"></div>
</body>
</html>
Now, I see the following error on the firebug.
ReferenceError: $ is not defined
$(function() {
index.html (line 11, col 2)
Try this:
jQuery(document).ready(function () {
(function() {
$("#slider").slider();
})();
});
EDITED:
Ok , the issue comes from the tags.
You wrote this:
<!DOCTYPE html>
<html>
<script src= "jquery-2.1.4.min.js"> </script>
<script src= "js/jquery-ui.js"> </script>
<script src= "js/jqueryTutorial.js"> </script>
<title> "My Page"</title>
<head> "Hello Jquery"</head>
<body>
<div id="slider"> </div>
</body>
</html>
And you HAVE to write this:
<!DOCTYPE html>
<html>
<head>
<script src= "jquery-2.1.4.min.js"> </script>
<script src= "js/jquery-ui.js"> </script>
<script src= "js/jqueryTutorial.js"> </script>
<title> "My Page"</title>
</head>
<body>
<div id="slider"> </div>
</body>
</html>
;-)
EDITED AGAIN
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI Slider - Default functionality</title>
<link rel="stylesheet" href="http://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
<script src="http://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<script>
jQuery(function() {
$( "#slider" ).slider();
});
</script>
</head>
<body>
<div id="slider"></div>
</body>
</html>
Include your <script> tags before closing body tag </body>. Moreover you have some mistakes in your markup, like the <title> should be inside <head> tag( for heading use <h1> upto <h7> tags ). Like this:
<!DOCTYPE html>
<html>
<head>
<title>"My Page"</title>
</head>
<body>
<h1>hello jQuery</h1>
<div id="slider"></div>
<!-- load scripts -->
<script src="jquery-2.1.4.min.js">
</script>
<script src="js/jquery-ui.js">
</script>
<script src="js/jqueryTutorial.js">
</script>
</body>
</html>
And your javascript will simply be:
$('#slider').slider();
if that doesn't works try:
$(document).ready( function () {
$('#slider').slider();
}
Because if you include them at beginning, whole HTML document will not be completely loaded at the time the scripts get executed, so the script won't be able to find elements.
And I don't think .slider() gives you what you want. I suggest you learn more first. Try www.codecademy.com
I am new to qunit.I am running simple testcase in qunit.but nothing is getting displayed on screen.
This is HTML Runner:-
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>QUnit Demo</title>
<link rel="stylesheet" href="//code.jquery.com/qunit/qunit-1.14.0.css">
<script src="//code.jquery.com/qunit/qunit-1.14.0.js"></script>
<script src="MyJsUnitTests.js"></script>
<script src="MyJsSourceCode.js"></script>
</head>
<body>
<div id="qunit"></div>
<div id="qunit-fixture"></div>
</body>
</html>
This is MyJsSourceCode.js
var ArthimeticOperations = {
addTwoNumbers : function (number1, number2) {
return number1 + number2;
}
}
This is MyJsUnitTests.js
test('Addition Test', function () {
strictEqual(ArthimeticOperations.addTwoNumbers(3, 5), 8, "Tested the addition functionality");
});
Try swapping the source code and test code includes... my guess is that your tests start running before the source code is included in the page:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>QUnit Demo</title>
<link rel="stylesheet" href="//code.jquery.com/qunit/qunit-1.14.0.css">
<script src="//code.jquery.com/qunit/qunit-1.14.0.js"></script>
<!-- SWAP THESE TWO...
<script src="MyJsUnitTests.js"></script>
<script src="MyJsSourceCode.js"></script>
Like so:
-->
<script src="MyJsSourceCode.js"></script>
<script src="MyJsUnitTests.js"></script>
</head>
<body>
<div id="qunit"></div>
<div id="qunit-fixture"></div>
</body>
</html>