I have an html form like this:

<form id="boxy" action="layout.html" method="get" accept-charset="utf-8">
  <input type="text" id="a" onkeypress="Boxy.Check(this);">
</form>

Invoking javascript like this:

Boxy.Check = function() {
    input = document.getElementById(this.currentSelector.id).value;
    console.log("\"" + input + "\"");
};

However, this.value is the previous value before onkeypress.

For example, if I just type "A" into the form, console.log() prints "". And if I type "AA", console.log prints "A".

Is there a way to get the current content of the input?