如何查找父级最近的锚点标记

How to find parent closest anchor tag

本文关键字：最近 何查找 查找      更新时间：2023-09-26

我正在尝试更改锚点标记的背景色。为了找到这个锚标记，我有一个带有id的跨度。那么我该如何找到这个锚标签呢。Html代码低于

<li class="fa-2x lesson_strand active">
    <a onclick="window.open('/wwtb/api/viewer.pl?uid=demo_user&cid=1&wid=NAGM15GRA4_HWK4OAC1&role=Student','_blank','toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=1014,height:655,left=150,top=50,titlebar=yes')" href="#">
        <b class="fa_text">Domain 4.OA Cluster 1 Quiz (Homework)</b>
    </a>
    <a onclick="window.open('/ePC/ePlannerAssessment.do?isbn=9780544349179&isSoar=0&toolType=12&uniqueID=NAGM15GRA4_HWK4OAC1&resourceBUID=NAGM15GRA4_HWK4OAC1&nextGenTool=WB%20HTTP/1.1','_blank','toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=1014,height:655,left=150,top=50,titlebar=yes')"
    href="#">
        <span id="assignButton_NAGM15GRA4_HWK4OAC1" class="assignButton" onclick="assignclicksToButton(event)">Assign</span>
    </a>
</li>

我正在尝试更改第一个锚标记的颜色，而我只有跨度id。我该怎么做呢。请帮忙。

谢谢！

使用.closest()（jQuery文档链接）

$(this).closest('a');

来自API文档：

对于集合中的每个元素，获取与选择器，方法是测试元素本身并向上遍历其DOM树中的祖先。

先使用.parent()，然后使用.prev方法$("#assignButton_NAGM15GRA4_HWK4OAC1").parent().prev().css({"color": "red", "border": "2px solid red"});

$("#assignButton_NAGM15GRA4_HWK4OAC1").parent().prev().css({"color": "red", "border": "2px solid red"});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<li class="fa-2x lesson_strand active">
  <a onclick="window.open('/wwtb/api/viewer.pl?uid=demo_user&cid=1&wid=NAGM15GRA4_HWK4OAC1&role=Student','_blank','toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=1014,height:655,left=150,top=50,titlebar=yes')" href="#">
    <b class="fa_text">Domain 4.OA Cluster 1 Quiz (Homework)</b>
  </a>
  <a onclick="window.open('/ePC/ePlannerAssessment.do?isbn=9780544349179&isSoar=0&toolType=12&uniqueID=NAGM15GRA4_HWK4OAC1&resourceBUID=NAGM15GRA4_HWK4OAC1&nextGenTool=WB%20HTTP/1.1','_blank','toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=1014,height:655,left=150,top=50,titlebar=yes')"
  href="#">
    <span id="assignButton_NAGM15GRA4_HWK4OAC1" class="assignButton" onclick="assignclicksToButton(event)">Assign</span>
  </a>
</li>

取closest li，然后取find，取该li的first a。希望下面给出的代码片段能对你有所帮助。

$('#assignButton_NAGM15GRA4_HWK4OAC1').closest('li')
.find('a:first').css('background-color', 'green');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<li class="fa-2x lesson_strand active">
    <a onclick="window.open('/wwtb/api/viewer.pl?uid=demo_user&cid=1&wid=NAGM15GRA4_HWK4OAC1&role=Student','_blank','toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=1014,height:655,left=150,top=50,titlebar=yes')" href="#">
        <b class="fa_text">Domain 4.OA Cluster 1 Quiz (Homework)</b>
    </a>
    <a onclick="window.open('/ePC/ePlannerAssessment.do?isbn=9780544349179&isSoar=0&toolType=12&uniqueID=NAGM15GRA4_HWK4OAC1&resourceBUID=NAGM15GRA4_HWK4OAC1&nextGenTool=WB%20HTTP/1.1','_blank','toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=1014,height:655,left=150,top=50,titlebar=yes')"
       href="#">
        <span id="assignButton_NAGM15GRA4_HWK4OAC1" class="assignButton" onclick="assignclicksToButton(event)">Assign</span>
    </a>
</li>

请尝试以下操作：

$("#assignButton_NAGM15GRA4_HWK4OAC1").closest('a').css({"background-color": "red"});
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