javascript - Bootstrap 多选限制问题

Question

我使用 Bootstrap Multiselect 创建了一个多选下拉列表.我需要在选项选择中设置一个限制(这里我将它设置为 5)，如果达到限制，我只是禁用其他选择选项并且它完美地工作。但问题是当我尝试使用 SHIFT 键选择超过 5 个时。它不起作用(意味着我的 jQuery 阻止选择不起作用)并且我可以选择超过 5 个。请检查代码段并给我一个解决方案。

JSFIDDLE

 jQuery('#soft_skill_list').multiselect({
        enableFiltering: true,
        maxHeight:400,
        enableCaseInsensitiveFiltering:true, 
        nonSelectedText: 'Soft Skills *', 
        numberDisplayed: 2, 
        selectAll: false, 
        onChange: function(option, checked) {
                // Get selected options.
                var selectedOptions = jQuery('#soft_skill_list option:selected');
 
                if (selectedOptions.length >= 5) {
                    // Disable all other checkboxes.
                    var nonSelectedOptions = jQuery('#soft_skill_list option').filter(function() {
                        return !jQuery(this).is(':selected');
                    });
 
                    nonSelectedOptions.each(function() {
                        var input = jQuery('input[value="' + jQuery(this).val() + '"]');
                        input.prop('disabled', true);
                        input.parent('li').addClass('disabled');
                    });
                }
                else {
                    // Enable all checkboxes.
                    jQuery('#soft_skill_list option').each(function() {
                        var input = jQuery('input[value="' + jQuery(this).val() + '"]');
                        input.prop('disabled', false);
                        input.parent('li').addClass('disabled');
                    });
                }
            }});

   
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" ></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-multiselect/0.9.13/js/bootstrap-multiselect.min.js"></script>

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-multiselect/0.9.13/css/bootstrap-multiselect.css" />

<select name="soft_skill_list[]" class="soft_skill_list"  id="soft_skill_list" multiple="multiple">
  <option>Analysing data</option>
  <option>Banquets Operations</option>
  <option>Concierge Operations</option>
  <option>Customer service experience</option>
  <option>Measuring and calculating</option>
  <option>Micros</option>
  <option>Numeracy Skills </option>
  <option>Opening Hotels</option>
  <option>Opera</option>
  <option>Outside catering</option>
  <option>Pre-opening</option>
  <option>Procedures </option>
  <option>Proficiency in computer programming</option>
  <option>Public speaking experience </option>
  <option>Reservation</option>
  <option>Restaurants operations</option>
  <option>Revenue Analysis</option>
  <option>Rooms Division</option>
  <option>Safety and Security</option>
  <option>Sales administration</option>
  <option>Sales Operations</option>
  <option>Social Media</option>
</select>

请查看图片

Answer 1

单击列表选项时需要阻止 Shift 键。试试下面的 jQuery。

Please Check it Out Here -> JSFIDDLE

var shiftClick = jQuery.Event("click");
shiftClick.shiftKey = true;

    $(".multiselect-container li *").click(function(event) {
        if (event.shiftKey) {
           //alert("Shift key is pressed");
            event.preventDefault();
            return false;
        }
        else {
            //alert('No shift hey');
        }
    });