Question

I am getting undefined as a value using the code below when I try to get the value of a textbox after a post. Is this possible or am I missing something basic?

<input type="text" size="3" value="<?php echo $item['qty'] ?>" id="quantity[<?php echo $sizeid?>]" name="quantity[<?php echo $sizeid?>]">

$.ajax({
type: "POST",
url: "bin/process_updateqty.php",
dataType: 'json',
data: dataString,
success: function(data) {
    $.each(data, function(key, value) {
        alert($('#quantity['+key+']').val());
    });
 }

});

Answer 1

Thanks for all your answers. I figured it out.

The answer to the original question is – YES, you can reference a textbox after a postback. The issue was I was referencing a textbox array incorrectly.

I was originally referencing the textbox like this:

$('#quantity['+key+']').val()

However I should have been referencing the textbox this way:

$('input[name="quantity['+key+']"]').val()