Input In JS

Question

How can I use something inputed on an HTML page in an if/switch statement?

Answer 1

Example-
var myName = prompt("Enter Name");// stores whatever you put in the prompt to the myName variable.

if(myName==""){
document.write("Please Enter a valid name.");
}else{
document.write("Nice name " + myName);
}
//you just need to declare your myName variable to use whatever you inputed using the prompt method.

Answer 2

HTML
<input id="myInput" />

JS
input = document.getElementById("myInput").value;
if(input === someValue){
// do something
}