I'm trying to make an audio editor but can't seem to get audio value. I've tried document.getElementById("audio).value and document.getElementById("audio").data but both return undefined
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input id="file" type="file">
<button id="save" onclick="save()">Save</button>
</body>
<script>
var audio;
document.getElementById("file").addEventListener("change",function(e){
var read=new FileReader()
read.onload=function(){
var aud=document.createElement("audio")
aud.id="audio"
aud.src=read.result
document.body.appendChild(aud)
aud.play()
}
read.readAsDataURL(document.getElementById("file").files[0])
})
function save(){
var aud=document.getElementById("audio").value
console.log(aud)
var a=document.createElement("a")
a.href=aud
a.download="test.mp3"
document.body.appendChild(a)
a.click()
}
</script>
</html>
The result is undefined because the audio doesn't has a attribute called value instead of value use src
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input id="file" type="file">
<button id="save" onclick="save(event)">Save</button>
</body>
<script>
var audio;
document.getElementById("file").addEventListener("change",function(e){
var read=new FileReader()
read.onload=function(){
var aud=document.createElement("audio")
aud.id="audio"
aud.src=read.result
document.body.appendChild(aud)
aud.play()
}
read.readAsDataURL(document.getElementById("file").files[0])
})
function save(e){
var aud=document.getElementById("audio").src;
var a=document.createElement("a")
a.href=aud
a.download="test.mp3"
document.body.appendChild(a)
a.click()
}
</script>
</html>
Run code snippet
If You use it the audio gonna be downloadable!
Related
I tried using Local Storage to store a variable to determine if a button can be used or not. This however is not working at all like I expected. Why is the Item getting shown as "null" and why is the console.log not working?
Index.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>index.html</title>
<script>
localStorage.setItem('status', 'unused')
console.log(localStorage.getItem('status'))
let usedButton = () => {
localStorage.setItem('status', 'used')
console.log(localStorage.getItem('status'))
window.location.replace('index2.html')
}
</script>
</head>
<body>
<button onclick="usedButton()">Use me</button>
</body>
</html>
index2.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>index2.html</title>
<script>
console.log(localStorage.getItem('status'))
let isButtonUsed = () => {
if(localStorage.getItem('status') == 'used'){
console.log('I was already used')
}
}
</script>
</head>
<body>
<button onclick="isButtonUsed()">Am I used?</button>
</body>
</html>
I tried making it so that the Button on index.html changes the localStorage variable status from 'unused' to 'used'. But on the 2nd page it is showing up as null and so the function is not working. I don't know how I can get a Button to work on one page and by clicking it disabling other buttons on other pages you redirect to.
Thank you in advance for your help.
I am facing a problem using mathjax. the equations already available are formatted but the equations that I put by myself are not being formatted.
here is my code:
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script async="true" src="https://cdn.jsdelivr.net/npm/mathjax#2/MathJax.js?config=AM_CHTML">
</script>
</head>
<body>
<input type="text" id="eq">
<button onclick="amb()">equation</button>
<p id="amb"></p>
<p>`x^3`</p>
<script>
function amb() {
eq = document.getElementById('eq').value;
document.getElementById('amb').append("`" + eq + "`");
}
</script>
</body>
</html>
First, I suggest use a form and a type=submit button for a better UX.
I found the solution you need to queue an action to rescan the page: MathJax.Hub.Queue(["Typeset",MathJax.Hub]);
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script async="true" src="https://cdn.jsdelivr.net/npm/mathjax#2/MathJax.js?config=AM_CHTML">
</script>
</head>
<body>
<form onsubmit="amb(); return false">
<input type="text" id="eq">
<input type="submit" value="equation">
</form>
<p id="amb"></p>
<p>`x^3`</p>
<script>
function amb() {
eq = document.getElementById('eq').value;
document.getElementById('amb').innerText = ("`" + eq + "`");
MathJax.Hub.Queue(["Typeset",MathJax.Hub]);
}
</script>
</body>
</html>
document.querySelectorAll('button').forEach (function(button){
button.onclick=function(){
document.querySelector('#hello').Style.color=button.dataset.color;
}
});
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<h1 id="hello">Hello wprld</h1>
<button data-color="red">Red</button>
<button data-color="green">green</button>
<button data-color="blue">Blue</button>
</body>
</html>
//Trying to change the color of the tag when the user clicks it
//trying to implement this function but it showing the same error style cannot be null
It's case sensitive. Not "Style", it is "style".
When it says undefined, check if it exists
document.querySelectorAll('button').forEach (function(button){
button.onclick=function(){
document.querySelector('#hello').style.color=button.dataset.color;
}
});
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<h1 id="hello">Hello wprld</h1>
<button data-color="red">Red</button>
<button data-color="green">green</button>
<button data-color="blue">Blue</button>
</body>
</html>
I have an assignment where I have to change h1 to whatever is written in the input. I have to do this through making a function with getElementByID.
This is what I have so far
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Change Text</title>
</head>
<body>
<h1 id="Header">Change header</h1>
<p>Use the input to change the header.</p>
<input type="text" oninput="changeh1(this.value)" />
<script>
function changeh1(newtext) {
document.getElementById("Header").textContent=
}
</script>
</body>
</html>
You passed the value (newtext) to your function but never used it:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Change Text</title>
</head>
<body>
<h1 id="Header">Change header</h1>
<p>Use the input to change the header.</p>
<input type="text" oninput="changeh1(this.value)" />
<script>
function changeh1(newtext) {
document.getElementById("Header").textContent=newtext;
}
</script>
</body>
</html>
Try changing your script to this:
function changeh1(newtext) {
document.getElementById("Header").innerText = newtext;
}
<script>
function changeh1(newtext) {
document.getElementById("Header").textContent = newtext;
}
</script>
The textContent API is useful to get and also set the text content of a node. In your original code, you did not set the content of the Node you were trying to modify (the header, h1). To fix it, just set it to the argument of the callback function you defined. In the DOM, you are passing this.value as the argument for newtext
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Change Text</title>
</head>
<body>
<h1 id="Header">Change header</h1>
<p>Use the input to change the header.</p>
<input type="text" oninput="changeh1(this.value)" />
<script>
function changeh1(newtext) {
document.getElementById("Header").textContent = newtext
}
</script>
</body>
</html>
I have embedded the twitter widget in an HTML. I have a JS object that contains URLs of 10 twitter profiles. I want to make a function that would let me replace the current URL (in the widget) with another one from the object.
However when running the script, the href will not change (error say its null).
Does Twitter maybe prevent any changes to href or other tags inside the HTML class?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<p>
<a class="twitter-timeline" id="twitter" data-width="300" data-height="500" href="https://twitter.com/Tesla"></a>
</p>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
<button onclick="change()">Change link</button> <button onclick="check()">Preview link</button>
<script>
var URL = document.getElementById("twitter").href;
console.log(URL);
function change() {
alert(document.getElementById("twitter").href = "https://twitter.com/IBMref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor");
}
function check() {
console.log(document.getElementById("twitter").href);
}
</script>
</body>
</html>
It did change, you just called alert on the change itself.
var URL = document.getElementById("twitter").href;
console.log(URL);
function change() {
document.getElementById("twitter").href = "https://twitter.com/IBM?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor";
alert(document.getElementById("twitter").href);
}
function check() {
console.log(document.getElementById("twitter").href);
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
</head>
<body>
<p>
<a class="twitter-timeline" id="twitter" data-width="300" data-height="500" href="https://twitter.com/Tesla"></a>
</p>
<button onclick="change()">Change link</button>
<button onclick="check()">Preview link</button>
</body>
</html>