I'm trying to learn AJAX, and do the example listed on W3School, but when I set up node js as server and trying to change DOM of my html, it didn't work.
This is before I press Button.
This is after I press Button.
The example lists below:
enter link description here
my code:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").load("demo_test.txt");
});
});
</script>
</head>
<body>
<div id="div1"><h2>Let jQuery AJAX Change This Text</h2></div>
<button>Get External Content</button>
</body>
</html>
Related
Im looking for a library that don't requires to be installed e.g it's API listed from an external source, like jQuery:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("p").click(function(){
$(this).hide();
});
});
</script>
</head><!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("p").click(function(){
$(this).hide();
});
});
</script>
</head>
<body>
<p>If you click on me, I will disappear.</p>
<p>Click me away!</p>
<p>Click me too!</p>
</body>
</html>
<body>
<p>If you click on me, I will disappear.</p>
<p>Click me away!</p>
<p>Click me too!</p>
</body>
</html>
In this case it's Socket.IO, but the problem here is that I need install Socket.IO. I don't want to do that. I just want to load its javascripts from an external source as above.
So my questions are:
Can Sockets.IO be loaded from an external source without being installed? If yes, from where? Who is hosting a reliable source?
If the anser is no on question 1. Is there another Socket library that can be done that way?
Yes, you can use the <script> tag to load Socket.io from a CDN:
<script src="https://cdn.socket.io/4.5.4/socket.io.min.js" integrity="sha384-/KNQL8Nu5gCHLqwqfQjA689Hhoqgi2S84SNUxC3roTe4EhJ9AfLkp8QiQcU8AMzI" crossorigin="anonymous"></script>
(Code snippet was borrowed from https://socket.io/docs/v4/client-installation/#from-a-cdn)
Below code work for if I used the same web URL
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").load("https://www.samewebsiteurl h1");
});
});
</script>
</head>
<body>
<div id="div1"><h2>Let jQuery AJAX Change This Text</h2></div>
<button>Get External Content</button>
</body>
</html>
I also want to fetch my website content on the same website, but it's not working in BlogSpot because of my website on Blogger.
Here is an example of one of my blog
http://ethiopian-adv.blogspot.com/2021/02/chemicals-and-conditioners-for-your.html
Please help me to fetch its post heading.
Is there a way to display a file having a .php extn in html using javacript on a click event as any files which are supposed to be displayed on different clicks ?
You can do this by jquery which is fairly simpler method
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").load("your file url");
});
});
</script>
</head>
<body>
<div id="div1"></div>
<button>load file</button>
</body>
</html>
I have typed in the javascript just as you have but on a separate file linked through the HTML file. The button shows up however I am not getting any alert when it is clicked. My code is as follows:
Javascript(index.js):
document.getElementById("myButton").onclick = function () {
alert("Hi");
}
HTML:
<!DOCTYPE html>
<html>
<head>
<title>Javascript is Fun!(When it works)</title>
<script type="text/javascript" src="index.js"></script>
</head>
<body>
<button id="myButton">Click</button>
</body>
</html>
Anyone know why my button is not working? It seems to me all my code is in order unless I am overlooking something.
Your code is being executed prior to the element it refers to existing in the page. Move the JavaScript to the end of the document or wrap it in a window.onload function.
window.onload = function () {
document.getElementById("myButton").onclick = function () {
alert("Hi");
}
}
jsFiddle example
You need to wait for the document to be constructed before you can reference elements in it.
Put your script tag in body, just before the end. This will ensure that the document is there when the script runs.
Or, you can wrap your js in a load listener like this
window.addEventListener("load", function(){
//...your stuff here
})
You should not put <script type="text/javascript" src="index.js"></script>
before <body></body>, because when the browser is trying to register the event, the <button> is not loaded already. So when you take a look at the control panel, you would get something like TypeError: document.getElementById(...) is null.
The right version might be
<!DOCTYPE html>
<html>
<head>
<title>Javascript is Fun!(When it works)</title>
</head>
<body>
<button id="myButton">Click</button>
</body>
<script type="text/javascript" src="index.js"></script>
</html>
Sometimes you should put script code below the button
<button id="myButton">Click</button>
document.getElementById("myButton").onclick = function () {
alert("Hi");
}
first thing is you haven't included jquery in your code, change your HTML to this
!DOCTYPE html>
<html>
<head>
<title>Javascript is Fun!(When it works)</title>
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
</head>
<body>
<button id="myButton">Click</button>
</body>
<script type="text/javascript" src="index.js"></script>
</html>
and your index.js to
$(document).ready(function(){
$('#myButton').click(function(){
alert("Hi");
});
});
this worked for me hope this work for you too
I have an image.html file in dreamweaver.
in source code I link an js file called img.js
<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<title>PHOTO</title>
<script language="javascript" type="text/javascript" src="js/img.js"></script>
</body>
</html>
if an use an alert in img.js
alert("My First Jquery Test");
it shows correctly in web page but if write some javascript code like
<html>
<body>
<p id="p2">Hello World!</p>
<script>
document.getElementById("p2").style.color="blue";
</script>
The paragraph above was changed by a script.
nothing shows..why and how I show this?
The script is working as you can see here.
Report your fully HTML file if still have problem.
Remember:
<html>
<head></head>
<body>
<p id="p2">Hello World!</p>
<script>
document.getElementById("p2").style.color="blue";
</script>
</body>
</html>
Do it right
edit img.js
window.onload=function(){
alert("My First Jquery Test");
document.getElementById("p2").style.color="blue";
}