javascript - 如何使用 jquery 将所选元素从一个下拉组列表 (optgroup) 移动到另一个下拉组列表 (optgroup)？

Question

我有两个下拉分组列表 (Optgroup)。我想使用向右移动、向左移动按钮在这两个 html 控件之间交换元素。我可以从左侧下拉列表项中选择一个或多个元素，然后单击右移按钮。在这种情况下，我可以将所选元素移动到右侧下拉分组列表。但是元素不会像左侧下拉分组列表那样作为分组列表插入。

这是我的 html 控件。

<select name="AvailableFields" id="AvailableFields" multiple="multiple" size="10">
<option value="">Please select</option>
<optgroup label="Group A">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</optgroup>
<optgroup label="Group B">
<option value="a">A</option>
<option value="b">B</option>
<option value="c">C</option>
</optgroup>
</select>

<button type="button" title="Forward" id="btnRight">Move Right</button>
<button type="button" title="Backward" id="btnLeft">Move Left</button>

<select name="FieldstoBeMatchedOn" id="FieldstoBeMatchedOn" multiple="multiple" size="10">
</select>

我编写了以下代码将元素从左下拉分组列表移动到右下拉分组列表。

<script type="text/javascript">
    $(document).ready(function () {
defaultListBind = function (e) {
            var selectedOpts = $('#FieldstoBeMatchedOn');
            alert(selectedOpts);
            $('#FieldstoBeMatchedOn').append($(selectedOpts).clone());
            $(selectedOpts).remove();
            //e.preventDefault();
        }
        // defaultListBind();

        $('#btnRight').click(function (e) {
            var selectedOpts = $('#AvailableFields option:selected');
            if (selectedOpts.length == 0) {
                alert("Nothing to move.");
                e.preventDefault();
            }

            $('#FieldstoBeMatchedOn').append($(selectedOpts).clone());
            $(selectedOpts).remove();
            defaultSelect();
            e.preventDefault();
        });

        $('#btnLeft').click(function (e) {
            var selectedOpts = $('#FieldstoBeMatchedOn option:selected');
            if (selectedOpts.length == 0) {
                alert("Nothing to move.");
                e.preventDefault();
            }

            $('#AvailableFields').append($(selectedOpts).clone());
            $(selectedOpts).remove();
            defaultSelect();
            e.preventDefault();
        });
defaultSelect = function () {
            $("#FieldstoBeMatchedOn option").each(function () {
                $(this).prop("selected", true);
            });
        }
    });
</script>

如何以分组或类别格式将元素从左侧下拉列表移动到右侧下拉列表？

JSfiddle

非常感谢您的帮助。

Answer 1

这个怎么样，你得想办法在右边什么都没有的时候把组去掉

 $(document).ready(function () {    
$('#btnRight').click(function (e) {
                var selectedOpts = $('#AvailableFields option:selected');
                if (selectedOpts.length == 0) {
                    alert("Nothing to move.");
                    e.preventDefault();
                }

    if(selectedOpts.parent().attr('label') == "Group A"){
        $('#FieldstoBeMatchedOn').append($('<optgroup label="Group A">')).append($(selectedOpts).clone());
                $(selectedOpts).remove();
                defaultSelect();
                e.preventDefault();
    }
    else{
        $('#FieldstoBeMatchedOn').append($('<optgroup label="Group B">')).append($(selectedOpts).clone());
                $(selectedOpts).remove();
                defaultSelect();
                e.preventDefault();
    }
            });

            $('#btnLeft').click(function (e) {
                var selectedOpts = $('#FieldstoBeMatchedOn option:selected');
                if (selectedOpts.length == 0) {
                    alert("Nothing to move.");
                    e.preventDefault();
                }

                $('#AvailableFields').append($(selectedOpts).clone());
                $(selectedOpts).remove();
                defaultSelect();
                e.preventDefault();
            });
    defaultSelect = function () {
                $("#FieldstoBeMatchedOn option").each(function () {
                    $(this).prop("selected", true);
                });
            }
        });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<select name="AvailableFields" id="AvailableFields" multiple="multiple" size="10">
    <option value="">Please select</option>
    <optgroup label="Group A">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    </optgroup>
    <optgroup label="Group B">
    <option value="a">A</option>
    <option value="b">B</option>
    <option value="c">C</option>
    </optgroup>
    </select>

    <button type="button" title="Forward" id="btnRight">Move Right</button>
    <button type="button" title="Backward" id="btnLeft">Move Left</button>

    <select name="FieldstoBeMatchedOn" id="FieldstoBeMatchedOn" multiple="multiple" size="10">
    </select>