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Select2 从输入字段而不是下拉列表开始

[英]Select2 start with input field instead of dropdown

我使用 js 库select2 这是我现在拥有的屏幕截图:
开始:
在此处输入图片说明
点击下拉菜单:
在此处输入图片说明

现在可以有一个输入字段而不是直接下拉列表吗? 我知道这是可能的,因为您可以在 select2 站点上找到它。 一个例子是这样的: 在此处输入图片说明在此处输入图片说明

但是文档非常简短。 这就是我现在所拥有的:

<input type="text" name="questions[question1]" id="question1" class="question1" style="width:500px"/>
function createQuestionTags(data, question_number){
  $(".question" + question_number).select2({
    createSearchChoice: function (term, data) {
      if ($(data).filter(function () {
        return this.text.localeCompare(term) === 0;
      }).length === 0) {
        return {
          id: term,
          text: term
        };
      }
    },
    data: data,
    placeholder: "Enter Question",
    allowClear:true
  });
}

(数据是从ajax调用接收的)

在该示例中,您看到的实际上是一个多选或多值下拉框。 它不是像您在代码中使用的单值下拉框。 根据 Select2 网站,select2 将检测到您正在尝试使用多选框,并将自动应用该样式而不是默认样式(下拉箭头等)。

如果您实际上需要一个单值下拉框,则没有直接的方法让它以多选的格式显示,使其看起来像一个常规输入框。 可能有一种方法可以通过添加或删除 CSS 类来伪造它。 我玩了一会儿,但找不到一个。

由于您不需要格式、搜索框或多选功能(我假设),您可能不需要使用 select2 库。

更新:看起来你不是第一个尝试这样做的人。 他们计划添加此功能,但可能需要一段时间: https : //github.com/ivaynberg/select2/issues/1345

我能想出的唯一解决方法是在设置时同时使用multiple: truemaximumSelectionSize: 1

请在此处查看我的示例: http : //jsfiddle.net/DanEtchy/Lnf8j/

这在 Select2 4.0.0 中可以通过新的选择适配器实现。 您可以用MultipleSelection (包括任何相关的装饰器)替换SingleSelection ,它应该按预期运行。

 $.fn.select2.amd.require([ 'select2/selection/multiple', 'select2/selection/search', 'select2/dropdown', 'select2/dropdown/attachBody', 'select2/dropdown/closeOnSelect', 'select2/compat/containerCss', 'select2/utils' ], function (MultipleSelection, Search, Dropdown, AttachBody, CloseOnSelect, ContainerCss, Utils) { var SelectionAdapter = Utils.Decorate( MultipleSelection, Search ); var DropdownAdapter = Utils.Decorate( Utils.Decorate( Dropdown, CloseOnSelect ), AttachBody ); $('.inline-search').select2({ dropdownAdapter: DropdownAdapter, selectionAdapter: SelectionAdapter }); $('.dropdown-search').select2({ selectionAdapter: MultipleSelection }); $('.autocomplete').select2({ dropdownAdapter: DropdownAdapter, selectionAdapter: Utils.Decorate(SelectionAdapter, ContainerCss), containerCssClass: 'select2-autocomplete' }); });
 .select2-selection__choice__remove { display: none !important; } .select2-container--focus .select2-autocomplete .select2-selection__choice { display: none; }
 <link href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.css" rel="stylesheet"/> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.full.js"></script> <p>With an inline search box</p> <select style="width: 200px" class="inline-search"> <option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option> </select> <p>With the search box in the dropdown</p> <select style="width: 200px" class="dropdown-search"> <option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option> </select> <p>With the selection hidden when it is focused</p> <select style="width: 200px" class="autocomplete"> <option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option> </select>

默认情况下,Select2 将设置下拉列表以进行搜索(而不是选择容器),如果您想完美地模拟多选,您需要覆盖该搜索。

而不是Select2更好的选择是selectize因为Select2似乎死了

用法很简单:

$('select').selectize(options);

以下是一些如何使用和自定义选择的selectize

就我而言,我希望用户从下拉列表中的选择显示在下拉列表下方的列表中,而不是像常规下拉列表一样工作。 所以这个解决方法对我有用:

$('#myselect').select2({
    multiple:true
})
.on('select2:select', function (e) {
    //clear the input box after a selection is made
    $(this).val([]).trigger('change');
});

当然,如果您希望所选项目在 select2 的输入框中保持选中状态,就像在常规 select2 多选列表中一样。

使用 Bootstrap 样式的自定义实现,简单但实用:

 var elements = $(document).find('select.form-control'); for (var i = 0, l = elements.length; i < l; i++) { var $select = $(elements[i]), $label = $select.parents('.form-group').find('label'); $select.select2({ allowClear: false, placeholder: $select.data('placeholder'), minimumResultsForSearch: 0, theme: 'bootstrap', width: '100%' // https://github.com/select2/select2/issues/3278 }); // Trigger focus $label.on('click', function (e) { $(this).parents('.form-group').find('select').trigger('focus').select2('focus'); }); // Trigger search $select.on('keydown', function (e) { var $select = $(this), $select2 = $select.data('select2'), $container = $select2.$container; // Unprintable keys if (typeof e.which === 'undefined' || $.inArray(e.which, [0, 8, 9, 12, 16, 17, 18, 19, 20, 27, 33, 34, 35, 36, 37, 38, 39, 44, 45, 46, 91, 92, 93, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 123, 124, 144, 145, 224, 225, 57392, 63289]) >= 0) { return true; } // Already opened if ($container.hasClass('select2-container--open')) { return true; } $select.select2('open'); // Default search value var $search = $select2.dropdown.$search || $select2.selection.$search, query = $.inArray(e.which, [13, 40, 108]) < 0 ? String.fromCharCode(e.which) : ''; if (query !== '') { $search.val(query).trigger('keyup'); } }); // Format, placeholder $select.on('select2:open', function (e) { var $select = $(this), $select2 = $select.data('select2'), $dropdown = $select2.dropdown.$dropdown || $select2.selection.$dropdown, $search = $select2.dropdown.$search || $select2.selection.$search, data = $select.select2('data'); // Above dropdown if ($dropdown.hasClass('select2-dropdown--above')) { $dropdown.append($search.parents('.select2-search--dropdown').detach()); } // Placeholder $search.attr('placeholder', (data[0].text !== '' ? data[0].text : $select.data('placeholder'))); }); }
 /* !important not needed with less */ .form-group { padding: 25px; } .form-group.above { position: absolute; bottom: 0; left: 0; right: 0; } .select2-container--open .select2-selection { box-shadow: none!important; } .select2-container--open .select2-selection .select2-selection__arrow { z-index: 9999; /* example */ } .select2-dropdown { /* .box-shadow(@form-control-focus-box-shadow); (from select2-boostrap */ -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(102, 175, 233, 0.6); box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(102, 175, 233, 0.6); /* border-color: @input-border-focus; */ border-color: #66afe9; border-top-width: 1px!important; border-top-style: solid!important; /* border-top-left-radius: @input-border-radius; */ border-top-left-radius: 4px!important; /* border-top-right-radius: @input-border-radius; */ border-top-right-radius: 4px!important; /* margin-top: -@input-height-base; */ margin-top: -34px!important; } .select2-dropdown .select2-search { padding: 0; } .select2-dropdown .select2-search .select2-search__field { /* !important not needed using less */ border-top: 0!important; border-left: 0!important; border-right: 0!important; border-radius: 0!important; /* padding: @padding-base-vertical @padding-base-horizontal; */ padding: 6px 12px; /* height: calc(@input-height-base - 1px); */ height: 33px; } .select2-dropdown.select2-dropdown--above { /* border-bottom: 1px solid @input-border-focus; */ border-bottom: 1px solid #66afe9!important; /* border-bottom-left-radius: @input-border-radius; */ border-bottom-left-radius: 4px!important; /* border-bottom-right-radius: @input-border-radius; */ border-bottom-right-radius: 4px!important; /* margin-top: @input-height-base; */ margin-top: 34px!important; } .select2-dropdown.select2-dropdown--above .select2-search .select2-search__field { /* border-top: 1px solid @input-border; */ border-top: 1px solid #66afe9!important; border-bottom: 0!important; }
 <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/> <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.1/css/select2.min.css" rel="stylesheet"/> <link href="https://select2.github.io/select2-bootstrap-theme/css/select2-bootstrap.css" rel="stylesheet"/> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.1/js/select2.full.min.js"></script> <div class="form-group"> <label class="control-label">Below example (click label to focus)</label> <select class="form-control" id="select2-single-box" name="select2-single-box" data-placeholder="Pick your choice" data-tabindex="1"> <option></option> <option value="1">First choice</option> <option value="2">Second choice</option> <option value="3">Third choice</option> <option value="4">Fourth choice</option> <option value="5">Fifth choice</option> <option value="6">Sixth choice</option> <option value="7">Seventh choice</option> <option value="8">Eighth choice</option> <option value="9">Ninth choice</option> </select> </div> <div class="form-group above"> <label class="control-label">Above example (click label to focus)</label> <select class="form-control" id="select2-single-box" name="select2-single-box" data-placeholder="Pick your choice" data-tabindex="2"> <option></option> <option value="1">First choice</option> <option value="2">Second choice</option> <option value="3">Third choice</option> <option value="4">Fourth choice</option> <option value="5">Fifth choice</option> <option value="6">Sixth choice</option> <option value="7">Seventh choice</option> <option value="8">Eighth choice</option> <option value="9">Ninth choice</option> </select> </div>

Select2 的 minimumInputLength: 1选项可以隐藏焦点/打开下拉菜单...

更新:代码清理,不要在焦点上打开下拉菜单。

马特,)

这项工作

$('.search-town-flat').select2({
        multiple: true,
        placeholder: "Enter values",
        allowClear: true,
        maximumSelectionLength: 2,
        theme      : "classic"
    }).on('select2:select', function (e) {
        $(this).val([]).trigger('change');
        $(this).val([e.params.data.id]).trigger("change");
    });

 $.fn.select2.amd.require([ 'select2/selection/multiple', 'select2/selection/search', 'select2/dropdown', 'select2/dropdown/attachBody', 'select2/dropdown/closeOnSelect', 'select2/compat/containerCss', 'select2/utils' ], function (MultipleSelection, Search, Dropdown, AttachBody, CloseOnSelect, ContainerCss, Utils) { var SelectionAdapter = Utils.Decorate( MultipleSelection, Search ); var DropdownAdapter = Utils.Decorate( Utils.Decorate( Dropdown, CloseOnSelect ), AttachBody ); $('.inline-search').select2({ dropdownAdapter: DropdownAdapter, selectionAdapter: SelectionAdapter }); $('.dropdown-search').select2({ selectionAdapter: MultipleSelection }); $('.autocomplete').select2({ dropdownAdapter: DropdownAdapter, selectionAdapter: Utils.Decorate(SelectionAdapter, ContainerCss), containerCssClass: 'select2-autocomplete' }); });
 .select2-selection__choice__remove { display: none !important; } .select2-container--focus .select2-autocomplete .select2-selection__choice { display: none; }
 <link href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.css" rel="stylesheet"/> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.full.js"></script> <p>With an inline search box</p> <select style="width: 200px" class="inline-search"> <option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option> </select> <p>With the search box in the dropdown</p> <select style="width: 200px" class="dropdown-search"> <option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option> </select> <p>With the selection hidden when it is focused</p> <select style="width: 200px" class="autocomplete"> <option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option><option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option> </select>

使用这些属性

$('#placeSelect').select2({
width: '100%',
allowClear: true,
multiple: true,
maximumSelectionSize: 1,   
});

只需在下拉菜单的 onchange 事件上调用此函数

function ResentForMe(){
var _text=$('.select2-selection__rendered li:first-child').attr('title');
$('.select2-selection__rendered li:first-child').remove();
$('.select2-search__field').val(_text);
$('.select2-search__field').css('width','100%');
}

注意:从选择中删除“多个”属性

伙计们,在任何地方添加一些 CSS:

.select2-dropdown--below {
    margin-top: -33px !important;
    border-radius: 4px !important;
}

试试吧! ;)

我只是用 CSS 格式化了一个标准输入框,使其看起来像一个 Select2() 下拉列表:

input {
    width: 100%;
    padding: 7px 5px;
    margin: 1px 0;
    display: inline-block;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

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