Select2 从筛选列表中选择所有选项以进行多项选择

Question

在我的 select 下拉菜单中使用 jQuery 的 select2 插件允许我快速输入和查找部分匹配项。但是，如果我想获取所有部分匹配项，我必须单击一个，再次键入过滤器，单击下一个，等等。很快就会变得乏味。相反，我想做的是输入前几个字符，然后输入 select 所有 FILTERED 选项。

例如，如果我有美国每个州的列表，然后输入 "New"，我会看到 "New Hampshire, New Jersey, New Mexico, New York"。我想要一种方法来 select 所有 4 个，而不必单击每个。

这是一个 jsfiddle 示例：https://jsfiddle.net/myingling/xv7bzqek/4/

<select name='state' id='state' multiple='multiple'>
                    <option value='null'> - Please Select - </option>
                    <option value='AL'>Alabama</option>
                    <option value='AK'>Alaska</option>
                    <option value='AZ'>Arizona</option>
                    <option value='AR'>Arkansas</option>
                    <option value='CA'>California</option>
                    <option value='CO'>Colorado</option>
                    <option value='CT'>Connecticut</option>
                    <option value='DE'>Delaware</option>
                    <option value='DC'>District Of Columbia</option>
                    <option value='FL'>Florida</option>
                    <option value='GA'>Georgia</option>
                    <option value='HI'>Hawaii</option>
                    <option value='ID'>Idaho</option>
                    <option value='IL'>Illinois</option>
                    <option value='IN'>Indiana</option>
                    <option value='IA'>Iowa</option>
                    <option value='KS'>Kansas</option>
                    <option value='KY'>Kentucky</option>
                    <option value='LA'>Louisiana</option>
                    <option value='ME'>Maine</option>
                    <option value='MD'>Maryland</option>
                    <option value='MA'>Massachusetts</option>
                    <option value='MI'>Michigan</option>
                    <option value='MN'>Minnesota</option>
                    <option value='MS'>Mississippi</option>
                    <option value='MO'>Missouri</option>
                    <option value='MT'>Montana</option>
                    <option value='NE'>Nebraska</option>
                    <option value='NV'>Nevada</option>
                    <option value='NH'>New Hampshire</option>
                    <option value='NJ'>New Jersey</option>
                    <option value='NM'>New Mexico</option>
                    <option value='NY'>New York</option>
                    <option value='NC'>North Carolina</option>
                    <option value='ND'>North Dakota</option>
                    <option value='OH'>Ohio</option>
                    <option value='OK'>Oklahoma</option>
                    <option value='OR'>Oregon</option>
                    <option value='PA'>Pennsylvania</option>
                    <option value='PR'>Puerto Rico</option>
                    <option value='RI'>Rhode Island</option>
                    <option value='SC'>South Carolina</option>
                    <option value='SD'>South Dakota</option>
                    <option value='TN'>Tennessee</option>
                    <option value='TX'>Texas</option>
                    <option value='UT'>Utah</option>
                    <option value='VT'>Vermont</option>
                    <option value='VA'>Virginia</option>
                    <option value='WA'>Washington</option>
                    <option value='WV'>West Virginia</option>
                    <option value='WI'>Wisconsin</option>
                    <option value='WY'>Wyoming</option>
</select>
<input type='button' id='all_visible' value='Select Visible' />
<script>
    jQuery('#state').select2();

    jQuery('#all_visible').click(function() {
         var visible = null; // TODO: how do we grab the filtered list?
         jQuery('#state').val(visible).trigger('change');
    });
</script>

有办法吗？ select2 文档展示了如何以编程方式 select 一个单一选项，而不是从他们自己的过滤列表中集中。 selecting ALL选项还有很多其他答案，但这将包括被过滤器隐藏的那些（例如：加利福尼亚）。

模拟样本：

Answer 1

我尝试从 select 下拉列表中获取筛选后的可见值。 select2插件将所有插件数据存储在data()对象中。在这里你可以得到 $("#select").data().

的结果

你所要做的就是遍历数据对象中过滤后的结果元素(li标签)并触发mouseup事件所有这些结果元素。

尝试下面的工作示例。

<html>

<head>
   
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  
    
    <script type="text/javascript"
        src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
    <link rel="stylesheet" type="text/css"
        href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/css/select2.min.css">

    <style id="compiled-css" type="text/css">

    </style>

    <script>
        $(document).ready(function() {
            $('#state').select2();
            
            $('#all_visible').click(function(event) {
            event.preventDefault();
            var visible = null; // TODO: how do we grab the filtered list?
             //   $('#state').val(visible).trigger('change');

                // Get the data object of state dropdown
                var filteredValues = [];
                var select2Holder = $('#state').data(); 

                if (select2Holder && select2Holder.select2) {
                    // Find the $results object
                    var results = select2Holder.select2.$results;
                    if (results) {
                      //  var resultNode$ = $(results[0]);
                      //  console.log(resultNode$);
                        
                        if ($(results[0]) && $(results[0]).children().length > 0) {
                            $(results[0]).children().each(function(index, node) {
                               
                                var selectedValue;
                                // Get the option value from attribute
                                var id = $(node).attr('id');
                                // id attribute will be like this 'select2-state-result-x3b0-NH'
                                // split the id attribute using "-" and get last value
                                var arr  = id.split('-');
                                if (arr && arr.length > 0) {
                                  selectedValue = arr[arr.length -1 ];
                                  filteredValues.push(selectedValue);
                                }

                                $(node).trigger('mouseup');
                              
                            })
                          
                        }
                        
                    }

                }
            });
        })
    </script>

  
</head>

<body >
    <select name='state' id='state' multiple='multiple'>
        <option value='null'> - Please Select - </option>
        <option value='AL'>Alabama</option>
        <option value='AK'>Alaska</option>
        <option value='AZ'>Arizona</option>
        <option value='AR'>Arkansas</option>
        <option value='CA'>California</option>
        <option value='CO'>Colorado</option>
        <option value='CT'>Connecticut</option>
        <option value='DE'>Delaware</option>
        <option value='DC'>District Of Columbia</option>
        <option value='FL'>Florida</option>
        <option value='GA'>Georgia</option>
        <option value='HI'>Hawaii</option>
        <option value='ID'>Idaho</option>
        <option value='IL'>Illinois</option>
        <option value='IN'>Indiana</option>
        <option value='IA'>Iowa</option>
        <option value='KS'>Kansas</option>
        <option value='KY'>Kentucky</option>
        <option value='LA'>Louisiana</option>
        <option value='ME'>Maine</option>
        <option value='MD'>Maryland</option>
        <option value='MA'>Massachusetts</option>
        <option value='MI'>Michigan</option>
        <option value='MN'>Minnesota</option>
        <option value='MS'>Mississippi</option>
        <option value='MO'>Missouri</option>
        <option value='MT'>Montana</option>
        <option value='NE'>Nebraska</option>
        <option value='NV'>Nevada</option>
        <option value='NH'>New Hampshire</option>
        <option value='NJ'>New Jersey</option>
        <option value='NM'>New Mexico</option>
        <option value='NY'>New York</option>
        <option value='NC'>North Carolina</option>
        <option value='ND'>North Dakota</option>
        <option value='OH'>Ohio</option>
        <option value='OK'>Oklahoma</option>
        <option value='OR'>Oregon</option>
        <option value='PA'>Pennsylvania</option>
        <option value='PR'>Puerto Rico</option>
        <option value='RI'>Rhode Island</option>
        <option value='SC'>South Carolina</option>
        <option value='SD'>South Dakota</option>
        <option value='TN'>Tennessee</option>
        <option value='TX'>Texas</option>
        <option value='UT'>Utah</option>
        <option value='VT'>Vermont</option>
        <option value='VA'>Virginia</option>
        <option value='WA'>Washington</option>
        <option value='WV'>West Virginia</option>
        <option value='WI'>Wisconsin</option>
        <option value='WY'>Wyoming</option>
</select>
<input type='button' id='all_visible' value='Select Visible' />
</body>

</html>

Select2 从筛选列表中选择所有选项以进行多项选择

Select2 choosing all options from filtered list for multiple selection

jquery

select

jquery-select2