jquery - 阅读 select2 version 4 下拉所选文本的正确方法是什么？

Question

我试图找出读取 select2 下拉项中当前选定文本(而不是值)的正确方法。我没有看到此列表 on the documentation .

我可以看到有一个新的 DOM 元素，它是原始选择下拉列表的 ID，带有“-container”后缀和“select2-”前缀，因此不确定是否建议阅读此内容或 select2 有另一个 api打电话。

使用jquery读取当前选定文本的正确方法是什么？

Answer 1

只需使用此答案中的详细信息即可: How to get Selected Text from select2 when using <input>

像这样:

$(function() { 
    // Initialise
    $('.example-basic-single').select2();
    $('.example-basic-multiple').select2();

    // Retrieve default selected value
    var defaultSelection = $('.example-basic-single').select2('data');
    $("#selectedS").text(defaultSelection[0].text);

    // Single select capture
    $('.example-basic-single').on("select2:select", function (e) { 
       var data = $(this).select2('data');
       $("#selectedS").text(data[0].text);
    });

    $('.example-basic-multiple').on("select2:select", function (e) { 
       var data = $(this).select2('data');
       var selectedText = $.map(data, function(selected, i) {
                              return selected.text;
                          }).join();
       $("#selectedM").text(selectedText);
    });
    $('.example-basic-multiple').on("select2:unselect", function (e) { 
       var data = $(this).select2('data');
       var selectedText = $.map(data, function(selected, i) {
                              return selected.text;
                          }).join();
       $("#selectedM").text(selectedText);
    });

});

.demo 
{ 
  margin: 10px;
}
.labelS, .labelM
{
  margin-top: 5px;
}
.selection
{ 
  margin-top: 5px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<script src="https://select2.github.io/dist/js/select2.full.js"></script>
<link href="https://select2.github.io/dist/css/select2.min.css" rel="stylesheet"/>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>

<div class="container">
	<div class="row">
		<div class="col-xs-4">
			<div class="selection">Single select:</div>
			<select class="example-basic-single form-control">
				<option value="1">One</option>
				<option value="2">Two</option>  
				<option value="3">Three</option>
			</select>
			<div class="labelS">Selected:</div>
			<div id="selectedS"></div>
		</div>
		<div class="col-xs-4">  
			<div class="selection">Multiple Select:</div>
			<select class="example-basic-multiple form-control" multiple="multiple">
				<option value="1">One</option>
				<option value="2">Two</option>  
				<option value="3">Three</option>
				<option value="4">Four</option>
				<option value="5">Five</option>
			</select>
			<div class="labelM">Selected:</div>
			<div id="selectedM"></div>
		</div>
	</div>
</div>