Untitled

Copy selection from one select field to many other select fields with jQuery?
<select class="offer_1 value_source" name="xnamex">
    <option value="">Please Select</option>
    <option value="xxxxxxx">Text</option>
</select>
<button class="copy_select offer_1" type="button" name="Copy" value="">Copy Down</button>
<select class="offer_1" name="xnamex">
    <option value="">Please Select</option>
    <option value="xxxxxxx">Text</option>
</select>
<!-- unknown quantity of selects follow -->

$(document).ready(function() {
    $('.copy_select').click(function() {
        attr_class = $(this).attr('class');
        attr_class = attr_class.replace('copy_select ', '.');
        $(attr_class).val($(attr_class + ' value_source').val());
        alert(attr_class);
    });
});

$('.copy_select').click(function() {
    $selects = $($(this).data('selects'));
    $source = $selects.filter('.value_source');
    $copies = $selects.not('.value_source');
    console.log($selects);
    console.log($source);
    console.log($copies);
    console.log($source.val());
    $copies.val($source.val());
})

<select class="offer_1 value_source" name="xnamex">
    <option value="">Please Select</option>
    <option value="a">Text</option>
    <option value="b">Foo</option>
    <option value="c">Bar</option>
</select>
<button class="copy_select" data-selects='.offer_1' type="button" name="Copy" value="">Copy Down</button>
<select class="offer_1" name="xnamex">
    <option value="">Please Select</option>
    <option value="a">Text</option>
    <option value="b">Foo</option>
    <option value="c">Bar</option>
</select>

$(".copy_select").click(function() {
    $("select[class^='offer_']").val($(this).prev().val());
});

$(document).ready(function() {
  $(".copy_select").click(function() {
    // store value
    var v =  $( ".value_source option:selected" ).val();
    // store text
    var t =  $( ".value_source option:selected" ).text();
    $("select[class^='offer_']").append(
         "<option value="" + v + "">" + t + "</option>"
    );
  });
});