Select2 带有用于多选的复选框列表答案

【问题标题】：Select2 with a checkbox list for a multiple selectSelect2 带有用于多选的复选框列表
【发布时间】：2014-05-20 00:51:56
【问题描述】：

我需要实现一个类似于这个http://www.erichynds.com/examples/jquery-ui-multiselect-widget/demos/的选择

我想为此使用 select2，但我无法从 select2 的创建者那里找到任何支持这种带有复选框的下拉样式的内容。有谁知道这样做的方法吗？

【问题讨论】：

这会让你感兴趣。 davidstutz.github.io/bootstrap-multiselect

标签： jquery-select2

【解决方案1】：

我也遇到过类似的需求，但找不到。

我遇到的解决方案是使用标志 closeOnSelect 设置为 false

$("#yadayada").select2({closeOnSelect:false}); http://jsfiddle.net/jEADR/521/

【讨论】：

【解决方案2】：

这似乎是旧帖子，但由于这是一个非常常见的问题，所以我在这里发布。

我发现作者已经在 select2 中添加了一个插件，以便该功能具有类似于复选框的选择，并且下拉菜单在单击时不会隐藏：

https://github.com/wasikuss/select2-multi-checkboxes

例子：

$('.select2-multiple').select2MultiCheckboxes({
    placeholder: "Choose multiple elements",
})

http://jsfiddle.net/wasikuss/gx93rwnk/

select2 的所有其他功能都被保留。还有几个预定义的选项设置可以正常工作。

【讨论】：

它不适用于 Select2 4.0.x。感谢您提供此示例，但您使用的是 3.5.4。我用 4.0.x 创建了一个小提琴和一个关于多复选框的问题：stackoverflow.com/questions/52263430/…
4.x版本有更新：github.com/wasikuss/select2-multi-checkboxes/tree/amd

【解决方案3】：

我设法把一些东西放在一起，虽然不完美，但它确实有效。

https://jsfiddle.net/Lkkm2L48/7/

jQuery(function($) {
    $.fn.select2.amd.require([
    'select2/selection/single',
    'select2/selection/placeholder',
    'select2/selection/allowClear',
    'select2/dropdown',
    'select2/dropdown/search',
    'select2/dropdown/attachBody',
    'select2/utils'
  ], function (SingleSelection, Placeholder, AllowClear, Dropdown, DropdownSearch, AttachBody, Utils) {

        var SelectionAdapter = Utils.Decorate(
      SingleSelection,
      Placeholder
    );

    SelectionAdapter = Utils.Decorate(
      SelectionAdapter,
      AllowClear
    );

    var DropdownAdapter = Utils.Decorate(
      Utils.Decorate(
        Dropdown,
        DropdownSearch
      ),
      AttachBody
    );

        var base_element = $('.select2-multiple2')
    $(base_element).select2({
        placeholder: 'Select multiple items',
      selectionAdapter: SelectionAdapter,
      dropdownAdapter: DropdownAdapter,
      allowClear: true,
      templateResult: function (data) {

        if (!data.id) { return data.text; }

        var $res = $('<div></div>');

        $res.text(data.text);
        $res.addClass('wrap');

        return $res;
      },
      templateSelection: function (data) {
        if (!data.id) { return data.text; }
        var selected = ($(base_element).val() || []).length;
        var total = $('option', $(base_element)).length;
        return "Selected " + selected + " of " + total;
      }
    })

  });

});

CSS：

.select2-results__option .wrap:before{
    font-family:fontAwesome;
    color:#999;
    content:"\f096";
    width:25px;
    height:25px;
    padding-right: 10px;

}
.select2-results__option[aria-selected=true] .wrap:before{
    content:"\f14a";
}

【讨论】：

【解决方案4】：

用 css 只添加两个表情符号

.select2-results__options {
    &[aria-multiselectable=true] {

        .select2-results__option {
            &[aria-selected=true]:before {
                content: '☑';
                padding: 0 0 0 4px;
            }

            &:before {
                content: '◻';
                padding: 0 0 0 4px;
            }
        }
    }
}

您会看到此示例是带有基于表情符号的复选框的 RTL select2

【讨论】：

【解决方案5】：

这里是非常简单的sn-p，没有对js进行奇怪的修改——纯粹简单的css（带“Font Awesome”）

$('.select2[multiple]').select2({
    width: '100%',
    closeOnSelect: false
})

#body{
padding: 30px
}

.select2-results__options[aria-multiselectable="true"] li {
    padding-left: 30px;
    position: relative
}

.select2-results__options[aria-multiselectable="true"] li:before {
    position: absolute;
    left: 8px;
    opacity: .6;
    top: 6px;
    font-family: "FontAwesome";
    content: "\f0c8";
}

.select2-results__options[aria-multiselectable="true"] li[aria-selected="true"]:before {
    content: "\f14a";
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/css/select2.min.css" rel="stylesheet"/>
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.11.2/css/all.css" rel="stylesheet"/>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.11.2/js/all.min.js"></script>


<div id="body">
<select name="fabric_color_en[]" id="fabric_color_en[]" multiple="multiple" class="form-control select2">
    <option value="Beige">
        Beige
    </option>

    <option value="Red">
        Red
    </option>

    <option value="Petrol">
        Petrol
    </option>

    <option value="Royal Blue">
        Royal Blue
    </option>

    <option value="Dark Blue">
        Dark Blue
    </option>

    <option value="Bottle Green">
        Bottle Green
    </option>

    <option value="Light Grey">
        Light Grey
    </option>
</select>
</div>

【讨论】：

【解决方案6】：

现在代码已准备好用于实现多个复选框 select2 下拉菜单。

享受 :) //================================================

//Start - Select 2 Multi-Select Code======================================================
var Select2MultiCheckBoxObj = [];
var id_selectElement = 'id_SelectElement';
var staticWordInID = 'state_';

function AddItemInSelect2MultiCheckBoxObj(id, IsChecked) {
    if (Select2MultiCheckBoxObj.length > 0) {
        let index = Select2MultiCheckBoxObj.findIndex(x => x.id == id);
        if (index > -1) {
            Select2MultiCheckBoxObj[index]["IsChecked"] = IsChecked;
        }
        else {
            Select2MultiCheckBoxObj.push({ "id": id, "IsChecked": IsChecked });
        }
    }
    else {
        Select2MultiCheckBoxObj.push({ "id": id, "IsChecked": IsChecked });
    }
}

function IsCheckedAllOption(trueOrFalse) {
    $.map($('#' + id_selectElement + ' option'), function (option) {
        AddItemInSelect2MultiCheckBoxObj(option.value, trueOrFalse);
    });
    $('#' + id_selectElement + " > option").not(':first').prop("selected", trueOrFalse); //This will select all options and adds in Select2
    $("#" + id_selectElement).trigger("change");//This will effect the changes
    $(".select2-results__option").not(':first').attr("aria-selected", trueOrFalse); //This will make grey color of selected options

    $("input[id^='" + staticWordInID + "']").prop("checked", trueOrFalse);
}

$(document).ready(function () {
    //Begin - Select 2 Multi-Select Code
    $.map($('#' + id_selectElement + ' option'), function (option) {
        AddItemInSelect2MultiCheckBoxObj(option.value, false);
    });

    function formatResult(state) {
        if (Select2MultiCheckBoxObj.length > 0) {
            var stateId = staticWordInID + state.id;
            let index = Select2MultiCheckBoxObj.findIndex(x => x.id == state.id);
            if (index > -1) {
                var checkbox = $('<div class="checkbox"><input class="select2Checkbox" id="' + stateId + '" type="checkbox" ' + (Select2MultiCheckBoxObj[index]["IsChecked"] ? 'checked' : '') +
                    '><label for="checkbox' + stateId + '">' + state.text + '</label></div>', { id: stateId });
                return checkbox;
            }
        }
    }

    let optionSelect2 = {
        templateResult: formatResult,
        closeOnSelect: false,
        width: '100%'
    };

    let $select2 = $("#" + id_selectElement).select2(optionSelect2);

    //var scrollTop;
    //$select2.on("select2:selecting", function (event) {
    //    var $pr = $('#' + event.params.args.data._resultId).parent();
    //    scrollTop = $pr.prop('scrollTop');
    //    let xxxx = 2;
    //});

    $select2.on("select2:select", function (event) {
        $("#" + staticWordInID + event.params.data.id).prop("checked", true);
        AddItemInSelect2MultiCheckBoxObj(event.params.data.id, true);
        //If all options are slected then selectAll option would be also selected.
        if (Select2MultiCheckBoxObj.filter(x => x.IsChecked === false).length === 1) {
            AddItemInSelect2MultiCheckBoxObj(0, true);
            $("#" + staticWordInID + "0").prop("checked", true);
        }
    });

    $select2.on("select2:unselect", function (event) {
        $("#" + staticWordInID + "0").prop("checked", false);
        AddItemInSelect2MultiCheckBoxObj(0, false);
        $("#" + staticWordInID + event.params.data.id).prop("checked", false);
        AddItemInSelect2MultiCheckBoxObj(event.params.data.id, false);
    });

    $(document).on("click", "#" + staticWordInID + "0", function () {
        //var b = !($("#state_SelectAll").is(':checked'));
        var b = $("#" + staticWordInID + "0").is(':checked');

        IsCheckedAllOption(b);
        //state_CheckAll = b;
        //$(window).scroll();
    });
    $(document).on("click", ".select2Checkbox", function (event) {
        let selector = "#" + this.id;
        let isChecked = Select2MultiCheckBoxObj[Select2MultiCheckBoxObj.findIndex(x => x.id == this.id.replaceAll(staticWordInID, ''))]['IsChecked'];
        $(selector).prop("checked", isChecked);
    });

});


//====End - Select 2 Multi-Select Code==

<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.css" rel="stylesheet"/>


<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/js/bootstrap.bundle.min.js" integrity="undefined" crossorigin="anonymous"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/js/select2.min.js"></script>


<div class="container-fluid">
<hr/>
<p>Here, you can select any item by clicking on row or checked in on checkbox and can unselect in reverse way.</p>
<p>But I didn't give the option to select "SelectAll" option by clicking on his row, you can select-all and unselect-all by click on checkbox only rather than row.</p>
        <div class="row" style="width:50%">

            <label for="id_SelectElement" class="col-sm-2">Part Name: </label>
            <div class="col-sm-4">
                <select id="id_SelectElement" placeholder="Select Text" multiple>
                    <option value="0" disabled>Select All</option>
                    <option value="11">Php</option>
                    <option value="22">Bootstrap</option>
                    <option value="33">sql</option>
                    <option value="44">Node Js</option>
                    <option value="55">Laravel</option>
                    <option value="66">Jquery</option>
                     <option value="77">React</option>
                    <option value="88">Vew.JS</option>
                    <option value="99">MVC</option>
                    <option value="10">DotNetCore</option>
                    <option value="12">Java</option>
                    <option value="13">Artifical Intiligence</option>
                     <option value="14">Data Structure</option>
                    <option value="15">Data Science</option>
                    <option value="16">Robotics</option>
                    <option value="17">Node Js 2</option>
                    <option value="18">Laravel 23</option>
                    <option value="19">Jquery 3.4</option>
                </select>

                
            </div>
        </div>


    </div>

【讨论】：

【解决方案7】：

另一种解决方法是使用 CSS “预先”添加复选框图标。我使用引导主题 - 您的 select2-container 可能不同。

.select2-container--bootstrap .select2-results__option[aria-selected=true]:before { content:'\e067 '; padding:0 8px 0 0px; font-family:'Glyphicons Halflings' }
.select2-container--bootstrap .select2-results__option:before { content:'\e157 '; padding:0 8px 0 0px; font-family:'Glyphicons Halflings' }

【讨论】：