Catch value(s) with jQuery

I have this snippet below, but I don't know how to catch value(s) with jQuery. How could we get some values from input text?

<script type="text/javascript">
$(document).ready(function() {
    $("#fileInput2").uploadify({
        //How get value from input (fileInput2)
    });
});
</script>
<div class="demo">
    <input id="fileInput2" name="fileInput2" type="file" />
    <a href="javascript:$('#fileInput2').uploadifyUpload();">Upload Files</a>
</div>
开发者_StackOverflow中文版

<script type="text/javascript">
    $(document).ready(function()
    {
        $("#fileInput2").uploadify(
        {
            // Get value
            var input_field_value = $(this).val()
       });
    });
</script>

<div class="demo">
    <input id="fileInput2" name="fileInput2" type="file" /> 
    <a href="javascript:$('#fileInput2').uploadifyUpload();">Upload Files</a>
</div>

EDIT

You are calling the uploadify function on fileInput2, so if you write $(this), it will refer to this same element, which is fileInput2 textbox. So writing $(this).val() will give you the value of this input element.

Use the val() method:

$("#fileInput2").val();

Or:

$("#fileInput2").uploadify({
  alert($(this).val());
});