使用jquery从嵌套div中获取id

Question

我不知道怎么说这个.这有点乱.我不能用写字来提问.这是我的代码:

<div id="addfieldcontainerdropdown">
    <div id="addDropdownfield">
        <div id="div0">
            <select name="0" style="margin: 20px" id="0">
                <option value="1">1</option>
                <option value="2">2</option>
            </select>
            <input style="margin: 7px" id="1" placeholder="Value" onkeyup="check_if_value_set(this); return false;"
                   type="text">

            <span style="margin: 7px;cursor: pointer;" onclick="remove_fields(this);return false;"><iclass="fa fa-times"></i></span>
        </div>

        <div id="div2">
            <select name="2" style="margin: 20px" id="2">
                <option value="1">1</option>
                <option value="2">2</option>
            </select>
            <input style="margin: 7px" id="3" placeholder="Value" onkeyup="check_if_value_set(this); return false;"
                   type="text">

            <span style="margin: 7px;cursor: pointer;" onclick="remove_fields(this);return false;"><i class="fa fa-times"></i></span>
        </div>

        <div id="div4">
            <select name="4" style="margin: 20px" id="4">
                <option value="1">1</option>
                <option value="2">2</option>
            </select>
            <input style="margin: 7px" id="5" placeholder="Value" onkeyup="check_if_value_set(this); return false;"
                   type="text">
            <span style="margin: 7px;cursor: pointer;" onclick="remove_fields(this);return false;"><i class="fa fa-times"></i></span>
        </div>

    </div>

    <a href="javascript:void(0)" onclick="show_new_text_field(this);event.preventDefault();return false;" style="cursor:pointer">

    <span id="add_new_span" class="addnew" style="float: none;margin-left: 1%;"><i class="fa fa-plus fa-fw"></i>Add New Field</span>

    </a>
</div>

您可以看到代码底部有一个名为"show_new_text_field(this)"的函数.使用这个函数,我需要获取说id,div4的id或选择id的框4.如何做到这一点？我尝试使用prent()和nearest().没有任何效果.任何类型的建议将不胜感激.提前致谢 !!

Answer 1

像这样的东西？

var lastDiv = $("[id^=div]").last(); //Get Last div whose ID begins with "div"
var lastDivId = lastDiv.attr('id'); //Get ID of that div
var firstSelect = lastDiv.find('select').first(); //Get the first 'select' of that div
var firstSelectId = firstSelect.attr('id'); //Get that select's ID

console.log("Last Div: " + lastDivId); // "Last Div: div4"
console.log("First Select in " + lastDivId + ": " + firstSelectId); //"First Select in div4: 4"

如果您的div不总是以"div"开头,您可以通过这样做div来选择父(addDropdownfield)的最后一个子节点:

var lastDiv = $("#addDropdownfield div").last(); //Get all children divs of addDropdownfield - from that list, just the last one