Binding Doesn't Work Inside A JQuery Callback?

I have the following code:

<input type="text" ID="JOB_CODETextBox" runat="server" value='<%# Eval("JOB_CODE") %>' readonly="readonly"
onclick="$('#basic-modal-content').modal(
{
appendTo:'form', persist: true,
onClose: function (dialog)
{
document.findElementById('<%= JOB_CODETextBox.ClientID %>').value = 'value';
$.modal.close();
}
} );" />

The problem is, the binding '<%= JOB_CODETextBox.ClientID %>' doesn't work, it returns the same binding expression after renderign instead of replace it with the actual client id!