重置select2值并显示占位符

How do I set the placeholder on value reset by select2. In my example If locations or grade select boxes are clicked and my select2 has a value than the value of select2 should reset and show the default placeholder. This script is resetting the value but won't show the placeholder

如何通过select2设置值重置上的占位符。在我的示例中，如果单击了位置或等级选择框，并且我的select2的值大于select2的值，则应该重置并显示默认占位符。这个脚本正在重新设置值，但不会显示占位符

$("#locations, #grade ").change(function() {
   $('#e6').select2('data', {
     placeholder: "Studiengang wählen",
     id: null,
     text: ''
   });
});

$("#e6").select2({
   placeholder: "Studiengang wählen",
   width: 'resolve',
   id: function(e) {
     return e.subject;
   },
   minimumInputLength: 2,
   ajax: {
     url: "index.php?option=com_unis&task=search.locator&tmpl=component&<?php echo JSession::getFormToken() ?>=1",
     dataType: 'json',
     data: function(term, page) {
       return {
         q: term, // search term
         g: $('#grade option:selected').val(),
         o: $('#locations option:selected').val()
       };
     },
     results: function(data, page) {
       return {
         results: data
       };
     }
   },
   formatResult: subjectFormatResult,
   formatSelection: subjectFormatSelection,
   dropdownCssClass: "bigdrop",
   escapeMarkup: function(m) {
     return m;
   }
});

28 个解决方案

#1

183

You must define the select2 as

必须将select2定义为

$("#customers_select").select2({
    placeholder: "Select a customer",
    initSelection: function(element, callback) {                   
    }
});

To reset the select2

重设select2

$("#customers_select").select2("val", "");

#2

Select2 has changed their API:

Select2改变了他们的API:

Select2: The select2("val") method has been deprecated and will be removed in later Select2 versions. Use $element.val() instead.

Select2: Select2(“val”)方法已被废弃，将在以后的Select2版本中删除。使用$ element.val()。

The best way to do this now is:

现在最好的办法是:

$('#your_select_input').val('');

Edit: December 2016 Comments suggest that the below is the updated way to do this:

编辑:2016年12月评论建议以下是更新的方式:

$('#your_select_input').val([]);

#3

The accepted answer does not work in my case. I'm trying this, and it's working:

在我的情况下，公认的答案是无效的。我正在尝试这个，它正在起作用:

Define select2:

定义select2:

$("#customers_select").select2({
    placeholder: "Select a State",
    allowClear: true
});

或

$("#customers_select").select2({
    placeholder: "Select a State"
});

To reset:

重置:

$("#customers_select").val('').trigger('change')

或

$("#customers_select").empty().trigger('change')

#4

The only thing can work for me is:

唯一对我有用的是:

$('select2element').val(null).trigger("change")

I'm using version 4.0.3

我用4.0.3版本

#5

Select2 uses a specific CSS class, so an easy way to reset it is:

Select2使用特定的CSS类，因此重置它的一种简单方法是:

$('.select2-container').select2('val', '');

And you have the advantage of if you have multiple Select2 at the same form, all them will be reseted with this single command.

如果在同一个表单中有多个Select2，那么所有的选项都将通过这个命令被重新设置。

#6

Use this :

用这个:

$('.select').val([]).trigger('change');

#7

TO REMOVE SELECTED VALUE

删除选中的值

$('#employee_id').select2('val','');

TO CLEAR OPTION VALUES

清除选项值

$('#employee_id').html('');

#8

I know this is kind of an old question, but this works for the select2 version 4.0

我知道这是一个老问题，但这适用于select2版本4.0。

 $('#select2-element').val('').trigger('change');

或

$('#select2-element').val('').trigger('change.select2');

if you have change events bound to it

如果您有更改事件绑定到它

#9

Firstly you must define select2 like this:

首先，您必须这样定义select2:

$('#id').select2({
    placeholder: "Select groups...",
    allowClear: true,
    width: '100%',
})

To reset select2, simply you may use the following code block:

要重置select2，只需使用以下代码块:

$("#id > option").removeAttr("selected");
$("#id").trigger("change");

#10

For users loading remote data, this will reset the select2 to the placeholder without firing off ajax. Works with v4.0.3:

对于加载远程数据的用户，这将在不启动ajax的情况下将select2重置为占位符。适用于v4.0.3:

$("#lstProducts").val("").trigger("change.select2");

#11

Use following to configure select2

使用以下命令配置select2

    $('#selectelementid').select2({
        placeholder: "Please select an agent",
        allowClear: true // This is for clear get the clear button if wanted 
    });

And to clear select input programmatically

并以编程方式清除select输入。

    $("#selectelementid").val("").trigger("change");
    $("#selectelementid").trigger("change");

#12

Following the recommended way of doing it. Found in the documentation https://select2.github.io/options.html#my-first-option-is-being-displayed-instead-of-my-placeholder (this seems to be a fairly common issue):

遵循推荐的方法。在文档中发现https://select2.github.io/options。html#my-first- is being-display -instead of- of-my-placeholder(这似乎是一个相当普遍的问题):

When this happens it usually means that you do not have a blank <option></option> as the first option in your <select>.

当这种情况发生时，通常意味着您在

as in:

如:

<select>
   <option></option>
   <option value="foo">your option 1</option>
   <option value="bar">your option 2</option>
   <option value="etc">...</option>
</select>

#13

I was also having this problem and it stems from val(null).trigger("change"); throwing a No select2/compat/inputData error before the placeholder gets reset. I solved it by catching the error and setting the placeholder directly (along with a width). Note: If you have more than one you will need to catch each one.

我也有这个问题它来自val(null)。trigger(“改变”);在占位符重置之前抛出一个No select2/compat/inputData错误。我通过捕获错误并直接设置占位符(以及宽度)来解决这个问题。注意:如果你有一个以上的，你需要抓住每一个。

try{
    $("#sel_item_ID").select2().val(null).trigger("change");
}catch(err){
    console.debug(err)
}
try{
    $("#sel_location_ID").select2().val(null).trigger("change");
}catch(err){
    console.debug(err)
}
$('.select2-search__field')[0].placeholder='All Items';
$('.select2-search__field')[1].placeholder='All Locations';
$('.select2-search__field').width(173);

I'm running Select2 4.0.3

我跑步Select2 4.0.3

#14

You can clear te selection by

你可以通过

$('#object').empty();

But it wont turn you back to your placeholder.

但它不会让你回到你的占位符。

So its a half solution

这是一半的解

#15

I have tried above solutions but none worked with version 4x.

我已经尝试过以上的解决方案，但是没有一个能与4x版本兼容。

What i want to achieve is: clear all options but don't touch the placeholder. This code works for me.

我想实现的是:清除所有选项，但不要触摸占位符。这个代码适合我。

selector.find('option:not(:first)').remove().trigger('change');

#16

I tried the above solutions but it didn't work for me.

我尝试了上述的解决方案，但没有奏效。

This is kind of hack, where you do not have to trigger change.

这是一种技巧，你不需要触发改变。

$("select").select2('destroy').val("").select2();

或

$("select").each(function () { //added a each loop here
        $(this).select2('destroy').val("").select2();
});

#17

as of v.4.0.x...

作为v.4.0.x……

to clear the values, but also restore the placeholder use...

要清除值，还要恢复占位符的使用…

.html('<option></option>');  // defaults to placeholder

if it's empty, it will select the first option item instead which may not be what you want

如果它是空的，它会选择第一个选项项而不是你想要的

.html(''); // defaults to whatever item is first

frankly...Select2 is such a pain in the butt, it amazes me it hasn't been replaced.

坦率地说……选择2是如此的痛苦，它让我惊讶它没有被取代。

#18

For the place holder

的占位符

$("#stateID").select2({
    placeholder: "Select a State"
});

To reset a select 2

重置选择2

$('#stateID').val('');
$('#stateID').trigger('change');

Hope this helps

希望这有助于

#19

This is the correct way:

这是正确的方法:

 $("#customers_select").val('').trigger('change');

I am using the latest release of Select2.

我正在使用Select2的最新版本。

#20

Before you clear the value using this $("#customers_select").select2("val", ""); Try setting focus to any other control on reset click.

在使用这个$(“#customers_select”)清除值之前。select2(“val”,“”);尝试设置焦点到任何其他控件的复位点击。

This will show the placeholder again.

这将再次显示占位符。

#21

The DOM interface, already keeps track of the initial state...

DOM接口，已经跟踪了初始状态…

So doing the following is enough:

因此，做以下的事情就足够了:

$("#reset").on("click", function () {
    $('#my_select option').prop('selected', function() {
        return this.defaultSelected;
    });
});

#22

Well whenever I did

每当我做了

$('myselectdropdown').select2('val', '').trigger('change');

I started getting some kind of lag after some three to four triggers. I suppose there's a memory leak. Its not within my code because if I do remove the this line, my app is lag free.

在3到4个触发点之后，我开始有一些延迟。我想可能有内存泄漏。它不在我的代码中，因为如果我删除了这条线，我的应用程序就会被延迟。

Since I have allowClear options set to true, I went with

由于我的allowClear选项设置为true，所以我选择了

$('.select2-selection__clear').trigger('mousedown');

This can be followed by a $('myselectdropdown').select2('close'); event trigger on the select2 dom element in case you wanna close the open suggestion drop down.

然后是$('myselectdropdown').select2('close');在select2 dom元素上的事件触发器，以防您想关闭open suggest下拉。

#23

One [very] hacky way to do it (I saw it work for version 4.0.3):

一种[非常]陈腐的方法(我看到它适用于4.0.3版):

var selection = $("#DelegateId").data("select2").selection;
var evt = document.createEvent("UIEvents");
selection._handleClear(evt);
selection.trigger("toggle", {});

allowClear must be set to true
allowClear必须设置为true。
an empty option must exist in the select element
选择元素中必须存在一个空选项

#24

Using select2 version 3.2 this worked for me:

使用select2版本3.2，这对我有用:

$('#select2').select2("data", "");

Didn't need to implement initSelection

不需要实现initSelection

#25

After trying the first 10 solutions here and failing, I found this solution to work (see "nilov commented on Apr 7 • edited" comment down the page):

在尝试了前10个解决方案后，我发现这个解决方案是有效的(参见“nilov对Apr 7•编辑的评论”):

(function ($) {
   $.fn.refreshDataSelect2 = function (data) {
       this.select2('data', data);

       // Update options
       var $select = $(this[0]);
       var options = data.map(function(item) {
           return '<option value="' + item.id + '">' + item.text + '</option>';
       });
       $select.html(options.join('')).change();
   };
})(jQuery);

The change is then made:

然后进行了更改:

var data = [{ id: 1, text: 'some value' }];
$('.js-some-field').refreshDataSelect2(data);

(The author originally showed var $select = $(this[1]);, which a commenter corrected to var $select = $(this[0]);, which I show above.)

(作者最初显示的是var $select = $(这个[1]);其中一个评论者更正为var $select = $(这个[0]);

#26

My solution is:

我的解决方案是:

$el.off('select2:unselect')
$el.on('select2:unselect', function (event) {
    var $option = $('<option value="" selected></option>');
    var $selected = $(event.target);

    $selected.find('option:selected')
             .remove()
             .end()
             .append($option)
             .trigger('change');
    });

#27

$('myselectdropdown').select2('val', '0')

where 0 is your first value of the dropdown

下拉菜单的第一个值是多少

#28

-1

In order to reset the values and the placeholder I just reinitiate the select2 element:

为了重置值和占位符，我重新启动select2元素:

$( "#select2element" ).select2({
    placeholder: '---placeholder---',
    allowClear: true,
    minimumResultsForSearch: 5,
    width:'100%'
});

#1

183