jquery-ui:如何在选择菜单项(选项)中设置类名？

Question

我有一个<select>为一个选项设置唯一类的形式:

<select id='mylist'>
    <option value = '1'>One</option>
    <option value = '2' class='my_element'>Two</option>
</select>

当我连接时selectmenu

$('#mylist').selectmenu();

新类 selectmenu对象消失(不出现)

<li class="ui-menu-item"><div id="ui-id-3" tabindex="-1" role="option" class="ui-menu-item-wrapper">Two</div></li>

如何解决？我想要

<li class="ui-menu-item"><div id="ui-id-3" tabindex="-1" role="option" class="ui-menu-item-wrapper my_element">Two</div></li>

或者

<li class="ui-menu-item my_element"><div id="ui-id-3" tabindex="-1" role="option" class="ui-menu-item-wrapper">Two</div></li>

Answer 1

您可以覆盖_renderMenu() :

$('#mylist').selectmenu().data("ui-selectmenu")._renderMenu = function(ul, items) {
    var that = this;
    items.forEach(function(ele, idx) {
        var li = that._renderItemData(ul, ele);
        if (ele.element.get(0).classList.length>0) {
            // preserve original classes...
            li.addClass(ele.element.get(0).classList.value);
        }
    });
};

.my_element {
    background-color: red;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://code.jquery.com/ui/1.12.0/themes/smoothness/jquery-ui.css" rel="stylesheet"/>
<script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>

<select id='mylist'>
    <option value='1'>One</option>
    <option value='2' class='my_element'>Two</option>
</select>