How can I convert a char to its keycode?

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You can use the charCodeAt function to achieve this.

Working example:

function showKeyCode () {
    var character = document.getElementById("character").value.substring(0, 1);
    var code = document.getElementById("character").value.charCodeAt(0);
    var msg = "The Key Code for the \"" + character + "\" character is " + code + ".";
    alert(msg);
}
<input type="text" id="character" size="15">
<input type="button" value="Show Key Code" onclick="showKeyCode();">

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