背景：当option特别多时，一般的下拉框选择起来就有点力不从心了，所以使用multiselect是个很好的选择，可以通过输入文字来选择选项很方便，但是有一个需要下拉框联动，网上找了半天才找到解决方法，在此分享一下

1、先引入

<script src="~/Assets/js/bootstrap-multiselect.min.js"></script>
 <link href="~/Assets/css/bootstrap-multiselect.css" rel="external nofollow" rel="stylesheet" />

然后全局定义

 function RegSelect() {
 $('.multiselect').multiselect({
 buttonClass: 'btn btn-white ',
 enableFiltering: true,
 enableHTML: true,
 includeSelectAllOption: true,
 selectAllText: '全选',
 allSelectedText: '全部选中',
 nonSelectedText: '请选择',
 nSelectedText: '个被选中',
 templates: {
 button: '<button type="button" class="multiselect dropdown-toggle" data-toggle="dropdown"><span class="multiselect-selected-text"></span>  <b class="fa fa-caret-down"></b></button>',
 ul: '<ul class="multiselect-container dropdown-menu"></ul>',
 filter: '<li class="multiselect-item filter"><div class="input-group"><span class="input-group-addon"><i class="fa fa-search"></i></span><input class="form-control multiselect-search" type="text"></div></li>',
 filterClearBtn: '<span class="input-group-btn"><button class="btn btn-default btn-white btn-grey multiselect-clear-filter" type="button"><i class="fa fa-times-circle red2"></i></button></span>',
 li: '<li><a tabindex="0"><label></label></a></li>',
 divider: '<li class="multiselect-item divider"></li>',
 liGroup: '<li class="multiselect-item multiselect-group"><label></label></li>'
 }
 });
 }

只需要在页面加载时RegSelect();（只能调用一次，不然会出现问题）就可以了

2、两个下拉框

 <div class="form-group">
 <label for="RepairOrg" class="col-sm-3 control-label">维修单位</label>
 <div class="col-sm-9">
 @Html.DropDownList("RepairOrgUID", ViewBag.OrgList as List<SelectListItem>, "请选择", new { @class = "form-control multiselect", onchange = "OrgChange(this)", id = "RepairOrg" })
 </div>
 </div>
 <div class="form-group">
 <label for="RepairContact" class="col-sm-3 control-label">维修人</label>
 <div class="col-sm-9">
 @Html.DropDownList("RepairContactUID", ViewBag.ContactList as List<SelectListItem>, "请选择", new { @class = "form-control multiselect", id = "RepairContact" })
 </div>
 </div>

3、js代码

function OrgChange(obj, patientID) {
 var RepairOrg = $(obj).val();
 $.post("/TerminalManage/GetContactByOrg", { RepairOrg: RepairOrg }, function (data) { 
 var newCitys = new Array();
 var obj = new Object();
 obj = {
 label: "请选择",
 value: ""
 };
 newCitys.push(obj);
 for (var i = 0; i < data.length; i++) {
 obj = {
 label: data[i].Text,
 value: data[i].Value
 };
 newCitys.push(obj);
 }
 $("#RepairContact").multiselect('dataprovider', newCitys);
 $('#RepairContact').multiselect('refresh');
 });
 }

总结

以上所述是小编给大家介绍的基于BootStrap multiselect.js实现的下拉框联动，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！