JQueryselect2得到 select 标签的值？

你好，朋友们，这是我的代码:

<select id='first'>
<option value='1'> First  </option>
<option value='2'> Second </option>
<option value='3'> Three  </option>
</select>

这是我的 select2代码:

$("#first").select2();

下面是获取选定值的代码。

$("#first").select2('val'); // It returns first,second,three.

这是返回一个像 first,second,three这样的文本，我想得到 1,2,3。
意味着我需要选择框的值，而不是文本。

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To get Select element you can use $('#first').val();

To get the text of selected value - $('#first :selected').text();

Can you please post your select2() function code

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See this fiddle.
Basically, you want to get the values of your option-tags, but you always try to get the value of your select-node with $("#first").val().

So we have to select the option-tags and we will utilize jQuerys selectors:

$("#first option").each(function() {
console.log($(this).val());
});

$("#first option") selects every option which is a child of the element with the id first.

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最佳答案 
$("#first").val(); // this will give you value of selected element. i.e. 1,2,3.
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$("#first").select2('data') will return all data as map

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This solution allows you to forget select element. Helpful when you do not have an id on select elements. 

$("#first").select2()
.on("select2:select", function (e) {
var selected_element = $(e.currentTarget);
var select_val = selected_element.val();
});
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If you are using ajax, you may want to get updated value of select right after the selection.

//Part 1


$(".element").select2(/*Your code*/)


//Part 2 - continued


$(".element").on("select2:select", function (e) {
var select_val = $(e.currentTarget).val();
console.log(select_val)
});

Credits: Steven-Johnston

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Try this :

$('#input_id :selected').val(); //for getting value from selected option
$('#input_id :selected').text(); //for getting text from selected option
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Simple answer is :

$('#first').select2().val()

and you can write by this way also:

 $('#first').val()
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Other answers wasn't working for me so i developed solution:

I created option with class="option-item" for easy targeting

HTML : 

<select id="select-test">
<option value="5-val" id="first-id" class="option-item"> First option </option>
</select>

Then for every selected option i added display none property

CSS: 

option:checked {
display: none;
}

Now we can add change to our SelectBox to find our selected option with display none property by simple :hidden attribute

JQuery: 

$('#select-test').change(function(){
//value
$('#select-test').find('.option-item:hidden').val();
//id
$('#select-test').find('.option-item:hidden').attr('id');
//text
$('#select-test').find('.option-item:hidden').text();
});

Working fiddle: https://jsfiddle.net/Friiz/2dk4003j/10/

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Solution : 

var my_veriable = $('#your_select2_id').select2().val();
var my_last_veriable = my_veriable.toString();
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Above solutions did not work for me with latest select2 (4.0.13)

With jQuery you can use this solution to retrieve value according to documentation: https://select2.org/programmatic-control/retrieving-selections

$('#first').find(':selected').val();
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$(".element").select2(/*Your code*/)
.on('change', function (e) {
var getID = $(this).select2('data');
alert(getID[0]['id']); // That's the selected ID :)
});

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