jquery text change when input change

Question

How can we do like the bottom, the simple way ?

?

it updates when we change the input.

Answer 1

Say you had the following HTML:

<input type="text" id="textbox"/>

<span>http://twitter.com/<span id="changeable_text"></span></span>

Your JS would listen for the keyup event.

$('input#textbox').keyup(function() {
   //perform ajax call...
   $('#changeable_text').text($(this).val());
});

Answer 2

Just attach to the keyup event of that textbox and update a span accordingly.

The textbox and span

<input type="text" id="txt-url-suffix" />
<div>Your public profile: http://www.twitter.com/<span id="url-suffix" /></div>

And some simple jQuery

var $urlSuffix = $("#url-suffix");
$("#txt-url-suffix").keyup(function() {
    var value = $(this).val();
    $urlSuffix.text(value);
});