i want to feed my javascript var value = value filled in an <input> . can i do it ? if yes please suggest the code.

Question

i want to pass input value through loops.

<input type="text" id="main">
<script>
var value = document.getElementById("demo") ;
if(value.length <= 6){
document.write("hellow world");
}
</script>

Answer 1

Practically nobody would use document.write to update any dom element. Please don't use document.write in your web update.

You can update input by
document.getElementById("demo").value = "hello world");

Answer 2

In the if section you can write,
if(value.length<=6){
value.innerHTML="hello world"
}
this will assign the element with id demo "hello value"
or you can do what Calvin says

Answer 3

ok!!

but i don,t want to print hellow world in main id .i want to pass input box value in if statement.
like if input box value's length is less or equal to 6 let say alert(" sjdvdjdjd" )

now how can i assign the var value /* in if operator */ = value filled in input box with id main