使用Javascript和/或JQuery,如何根据类查找后代元素？

Question

我无法修改此HTML:

<li data-corners="false" data-shadow="false" data-iconshadow="true" data-rapperels="div" data-icon="arrow-r" data-iconpos="right" data-theme="c" class="ui-btn ui-btn-icon-right ui-li-has-arrow ui-li ui-btn-up-c">
    <div class="ui-btn-inner ui-li">
        <div class="ui-btn-text"> 
            <a class="make-inline ui-link-inherit" href="#"> 
                <h3 class="ui-li-heading"> Attending: 
                </h3> 
            </a> 

            <div class="ui-select">
                <a href="#" role="button" id="undefined-button" aria-haspopup="true" aria-owns="undefined-menu" data-corners="true" data-shadow="true" data-iconshadow="true" data-wrapperels="span" data-icon="arrow-d" data-iconpos="right" data-theme="c" data-inline="true" data-mini="false" class="ui-btn ui-btn-up-c ui-btn-inline ui-shadow ui-btn-corner-all ui-fullsize ui-btn-icon-right ui-disabled" aria-disabled="true">
                    <span class="ui-btn-inner ui-btn-corner-all">
                        <span class="ui-btn-text"> Maybe </span>
                        <span class="ui-icon ui-icon-arrow-d ui-icon-shadow">&nbsp;</span>
                    </span>
                </a>
                <select class="attending 310 mobile-selectmenu-disabled ui-state-disabled" data-inline="true" data-native-menu="false" tabindex="-1" disabled="disabled" aria-disabled="true">
                    <option value="2"> Yes </option>
                    <option value="0"> No </option>
                    <option value="1"> Maybe </option>
                </select>
            </div>
        </div>


        <span class="ui-icon ui-icon-arrow-r ui-icon-shadow">&nbsp;</span>


    </div>
</li>

在选择标签包含类="出席",这是唯一对这个特定页面,所以我利用来访问的这部分代码.最后,我正在尝试使用class ="ui-icon-arrow-r" 访问最后一个span标记,所以我可以设置它的样式.我尝试过像这样使用jQuery:

$(".attending").parent().find(".ui-icon-arrow-r").css('background-color','yellow');

它不起作用.当我删除find()部分时,它会选择页面上的所有li元素.所以,我知道那部分是有效的.但是查找部分不是,我无法弄清楚为什么不.如何选择这个元素？

Answer 1

试试这个:

$(".attending").closest('div.ui-btn-inner').find(".ui-icon-arrow-r").css('background-color','yellow');