javascript - How does JQuery get the ID of the current element through the dot mark button (how to get the ID of dynamic data)

Question

1. The images in the picture and the candidate information displayed are all iterated from the DataList. The purpose is to obtain the corresponding examination time, subject code and other information by clicking the mark button.

To achieve this, click the mark button to send the current candidate's information back to the background for processing. How does JS get the detailed information of the current handwriting card? These pictures are dynamically iterated and have no fixed ID and name. JQuery does not know how to obtain unique picture-related information.

Page code:

    <asp:DataList ID="DataList1" runat="server" RepeatColumns="2">
        <ItemTemplate>
            <p class="col-lg-12">
                <p class="col-md-4 kmdm" style="margin-top: 5px">科目代码：<%#Eval("TJ_KM_DM")%></p>
                <p class="col-md-4 kssj" style="margin-top: 5px">考试时间：<%#Eval("KSSJ") %></p>
                <p>
                    <input class="jddz" type="text" value="<%#Eval("KSSJ").ToString()+Eval("TJ_KM_DM").ToString().Trim()+Eval("KS_ZKZ")%>" /></p>
                <p class="col-md-4">
                    <input style="margin-bottom: 5px" value="未标记" class="chexSign btn btn-success" type="button" onclick="signCard(this)" /></p>
                <img src="../../img/200701/0094/010207301376.jpg" alt="Responsive image" class=" well well-lg img-responsive img-thumbnail " />
            </p>
        </ItemTemplate>
    </asp:DataList>

Answer 1

function signCard(item){
    var parentp = $(item).parents(".col-lg-12"); // 外层的　p
    var time = parentp.find(".kssj").text(); // 这里取你想要的信息
    console.log(time);
}

parent() 取直接父级元素
parents() 取所有祖先元素

Answer 2

The usual practice is to generate data flags when dynamically generating dom, such as data-index = 'KSSJ', when jquery dynamically binds click events, use $(e.currentTarget).data('index') to obtain . Other fields can also be obtained through the e object, and detailed attributes can be browsed using console.log(e).