How to get input from the users in javascript programming language

Question

I want to get the data using forms in html

Answer 1

var person = prompt("Please enter your name", "Harry Potter");

if (person != null) {
document.getElementById("demo").innerHTML =
"Hello " + person + "! How are you today?";
}

like that...
https://www.w3schools.com/jsref/met_win_prompt.asp
https://www.w3schools.com/js/js_input_examples.asp

Answer 2

Example:
<input type="text" class="input_class">

<button class="btn" onClick="getValue()"><button>

Javascript:

function getValue(){

var inputVal = document.querySelector(".input_class").value

alert(inputVal)

}

Answer 3

<form name="f" onsubmit="alert(f[0].value); event.preventDefault();">
<input type="text" />
<button type="submit">Send</button>
</form>

https://code.sololearn.com/WHW6Acl3iWcY/?ref=app