AngularJS-当确认对话框为假时如何取消下拉菜单中的更改事件？

这是您可能不知道的窍门：

ng-change="dialog(myDropDown)"         // pass the NEW value of myDropDownng-change="dialog('{{myDropDown}}')"   // pass the OLD value of myDropDown

调用时

dialog()

然后，如果取消对话框，只需回滚即可。

var app = angular.module('myApp', []);app.controller('myCtrl', function($scope) {    $scope.dialog = function(prev) {        var dialog = confirm('Continue?');        if(!dialog) { $scope.myDropDown = prev; alert("Option must not change");        }    }});<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script><div ng-app="myApp" ng-controller="myCtrl">  <select ng-model="myDropDown" ng-change="dialog('{{myDropDown}}')">    <option>a</option>    <option>b</option>  </select></div>