在 select2 中使用 ajax 时无法获取自定义属性值

can not get customized attribute value when using ajax in select2

我正在使用 ASP.NET

I have a dropdown using select2 and an (apicontroller) action with two parameters is called using ajax when something is selected.

动作:

public class MyController: ApiController
{
    [HttpGet]
    public string Helper(string para0, string para1, string para2) { return something;}
}

html:

<select id="selectCase">
    <option>Select a Case</option>
    <option value="abc" data-para1="1" data-para2="2"> "abc" </option>
    <option value="def" data-para1="1" data-para2="2"> "abc" </option>
</select>

js函数:

$('#selectCase').on('select2:select', function() {
        $.ajax({
            type: "GET",
            url: "/api/MyController/Helper?para0=" + $(this).val() + "&para1=" + $(this).attr("data-para1") + "&para2=" + $(this).attr("data-para1"),

但是运行时只有$(this).val()得到正确的值,$(this).attr("data-para1"和$(this).attr("data-para1"是两者都未定义。还尝试使用 $(this).data("para1"),但仍然无法正常工作。

谢谢,


我实际上跳过了我在 html 中使用 optgroup 的部分,不确定这是否有什么不同

<select id="selectCase">
    <option></option>
    <optgroup label="0">
        <option value="abc" data-para1="1" data-para2="2"> "abc" </option>
    </optgroup>
    <optgroup label="0">
        <option value="def" data-para1="1" data-para2="2"> "abc" </option>
    </optgroup>
</select>

您可以使用 $(this).find('option:selected') 获取选定的选项,然后获取您在每个选项中定义的自定义属性。

演示代码 :

$('#selectCase').select2({
  width: '100%',
  placeholder: "Select an Option",
  allowClear: true
});

$('#selectCase').on('select2:select', function() {
  //getting selected option and then retrieve required data
  var $select = $(this).find('option:selected');
  console.log("para0=" + $select.val() + "&para1=" + $select.attr('data-para1') + "&para2=" + $select.attr('data-para2'));

});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/css/select2.min.css" rel="stylesheet" />

<select id="selectCase">
    <option></option>
    <optgroup label="0">
        <option value="abc" data-para1="1" data-para2="2"> "abc" </option>
    </optgroup>
    <optgroup label="0">
        <option value="def" data-para1="1" data-para2="2"> "abc" </option>
    </optgroup>
</select>