Javascript 如何（1）从角度/引导下拉列表中获取选定值，以及（2）显示选定选项？_Javascript_Angularjs_Twitter Bootstrap_Drop Down Menu

Javascript 如何（1）从角度/引导下拉列表中获取选定值，以及（2）显示选定选项？

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Javascript 如何（1）从角度/引导下拉列表中获取选定值，以及（2）显示选定选项？,javascript,angularjs,twitter-bootstrap,drop-down-menu,Javascript,Angularjs,Twitter Bootstrap,Drop Down Menu,我正在尝试让Angular UI下拉菜单正常工作：如何将值传递给角度函数，以便处理它如何在用户选择后显示所选选项，而不是始终显示“请选择”：普朗克： HTML: <!doctype html> <html ng-app="ui.bootstrap.demo"> <head> <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.13/angular.js"></

我正在尝试让Angular UI下拉菜单正常工作：

如何将值传递给角度函数，以便处理它

如何在用户选择后显示所选选项，而不是始终显示“请选择”：

普朗克：

HTML:

<!doctype html>
<html ng-app="ui.bootstrap.demo">
<head>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.13/angular.js"></script>
    <script src="//angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.13.0.js"></script>
    <link href="//netdna.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
    <script src="script.js"></script>
</head>
<body>

<div ng-controller="DropdownCtrl">
    <div class="dropdown">
        <button class="btn btn-default dropdown-toggle" 
          type="button" id="menu1" data-toggle="dropdown" ng-click="toggled">Please Select:
            <span class="caret"></span></button>
        <ul class="dropdown-menu" role="menu" aria-labelledby="menu1">
            <li role="presentation" ng-repeat="choice in items">
                <a role="menuitem" tabindex="-1" href="#">{{choice}}</a>
            </li>
        </ul>
    </div>
</div>

</body>
</html>

angular.module('ui.bootstrap.demo', ['ui.bootstrap']);
angular.module('ui.bootstrap.demo').controller('DropdownCtrl', function ($scope, $log) {

    $scope.items = ['one','two','three','four'];

    $scope.toggled = function(value) {
        alert('the value you chose was ' + value)
    };

});

在HTML中，修改与下拉列表相关的代码，以向下拉列表中显示的文本添加绑定（通过

ng bind

）+单击下拉列表中的元素时执行函数（通过

ng click

）：

使用此功能，您可以：
1.获取所单击项目的值

2.更新所选选项。

对于使用引导v4.0.0-alpha.6的Angular 4，这里有一个技巧，介绍如何做到这一点：

用于引导下拉控件的HTML

       <div class="form-group row">
          <label class="col-md-3 form-control-label">Account</label>
          <div class="col-md-9">
            <div class="btn-group" dropdown>
              <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle">
                {{selectedValue}} <span class="caret"></span>
              </button>
              <ul dropdownMenu class="dropdown-menu" role="menu">
                <li *ngFor="let account of accounts" value="{{account._id}}" (click)="selectValue(account)"
                    class="dropdown-item">{{account.firstname}} {{account.lastname}}
                </li>
              </ul>
            </div>
          </div>
        </div>

$scope.selected = "Tutorial";
$scope.setTutorial = function(value) {
  $scope.selected = value;
}

       <div class="form-group row">
          <label class="col-md-3 form-control-label">Account</label>
          <div class="col-md-9">
            <div class="btn-group" dropdown>
              <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle">
                {{selectedValue}} <span class="caret"></span>
              </button>
              <ul dropdownMenu class="dropdown-menu" role="menu">
                <li *ngFor="let account of accounts" value="{{account._id}}" (click)="selectValue(account)"
                    class="dropdown-item">{{account.firstname}} {{account.lastname}}
                </li>
              </ul>
            </div>
          </div>
        </div>

export class UserFormComponent implements OnInit {
   selectedValue: string = '-- select value --';
   selectedId: string;

   // On-Click Method on dropdown control
   selectValue(account: Account) {
      this.selectedValue = account.firstname + ' ' + account.lastname;
      this.selectedId = account._id;
   }
}