Javascript 在 bootstrap-select 中获取当前值

Get the current value in bootstrap-select

提问by Gene9y

I used e.target.valueto retrieve the current selected value from bootstrap-select but it returned the first selected value i.e. the alert kept displaying item 1, when item 1 and item 2 where selected even when item 2 was the most recently selected.

我曾经e.target.value从 bootstrap-select 中检索当前选定的值，但它返回了第一个选定的值，即警报继续显示项目 1，当项目 1 和项目 2 被选中时，即使项目 2 是最近选择的。

How can I get the value for the recent selection and how can I get how many options are selected?

如何获取最近选择的值以及如何获取选择了多少个选项？

   <select multiple class="selectpicker" multiple data-selected-text-format="count > 1">
    <option value="item 1">Item 1</option>
    <option value="item 2">Item 2</option>
    <option value="item 3">Item 3</option>
    <option value="item 4">Item 4</option>
    <option value="item 5">Item 5</option>

$('.selectpicker').change(function (e) {
    alert(e.target.value);
});

回答by Mirza Obaid

I think the answer may be easier to understand like this:

我认为这样的答案可能更容易理解：

$('#empid').on('click',function() {
  alert($(this).val());
  console.log($(this).val());
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.0/jquery.min.js"></script>
<select id="empid" name="empname" multiple="multiple">
  <option value="0">item0</option>
  <option value="1">item1</option>
  <option value="2">item2</option>
  <option value="3">item3</option>
  <option value="4">item4</option>
</select>
<br />
Hold CTRL / CMD for selecting multiple fields

If you select "item1" and "item2" in the list, the output will be "1,2".

如果在列表中选择“item1”和“item2”，输出将为“1,2”。

回答by kritikaTalwar

instead of e.target.value, you can use $(this).find("option:selected").text();

而不是e.target.value，你可以使用$(this).find("option:selected").text();

 $('.selectpicker').change(function () {
        var selectedItem = $('.selectpicker').val();
        alert(selectedItem);
    });

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />
<script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>


<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap-select.min.css">

<!-- Latest compiled and minified JavaScript -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap-select.min.js"></script>


<select class="selectpicker" multiple data-selected-text-format="count > 1">
 <option value="1">Item 1</option>
 <option value="2">Item 2</option>
 <option value="3">Item 3</option>
 <option value="4">Item 4</option>
 <option value="5">Item 5</option>
</select>

回答by akshat

$('.selectpicker').on('change', function(){
    var selected = []
    selected = $('.selectpicker').val()
    console.log(selected); //Get the multiple values selected in an array
    console.log(selected.length); //Length of the array
});

回答by Jean Dok

According to this post, you should do something like :

根据这篇文章，您应该执行以下操作：

$('.selectpicker').on('changed.bs.select', function (e) {
    var selected = e.target.value;
});

回答by Bilal Mustafa

This is the Solution:

这是解决方案：

$('#payment_method').on('hidden.bs.select', function (e) {
  // console.log(e.target.value);

  console.log(e.target.selectedOptions.length);

$.each( e.target.selectedOptions , function( index, obj ){
    console.log(obj.value);
});

});

You get the length of the selections, so may be helpful in for loop

您获得了选择的长度，因此可能对 for 循环有所帮助

console.log(e.target.selectedOptions.length);

and you can loop through the selected values too:

您也可以遍历选定的值：

$.each( e.target.selectedOptions , function( index, obj ){
    console.log(obj.value);
});

回答by Sheri Bgh

This is how I get the value of selected Item from select list:

这就是我从选择列表中获取所选项目的值的方式：

var e = document.getElementById("field_ID");  
var selected_value = e.options[e.selectedIndex].value;

回答by Icepack

In your case you need to take the value. I use jQuery to help for this:

在您的情况下，您需要取值。我使用 jQuery 来帮助解决这个问题：

$('.selectpicker').change(function (e) {
    alert($(e.target).val());
});

回答by Theva

My solution might help somebody

我的解决方案可能会帮助某人

The option value isn't always the same as the text

选项值并不总是与文本相同

$('.selectpicker').on('changed.bs.select', function () {
    let val = $(this).siblings('.btn.dropdown-toggle').attr('title');
    console.log(val);
});