jquery - Angular 自定义指令在输入字段更改时调用函数

Question

我有一个指令，将文件上传输入字段放置在 DOM 上，然后我希望能够在该文件更改时调用函数。如何在不将 on-change 函数放置在编译器区域的情况下使其工作？我知道它不属于那里，因为我被告知编译器更加占用内存，并且只能用于预渲染的东西。

angular.module('myApp').directive('customDirective', ['$http', function ($http) {

  return {
    controller() {

    },
    compile(element) {
      const $fileinput = $('<input type="file" accept=".csv">').appendTo(element);
      return {
        controller: () => {
          $fileinput.on('change', (e) => {
            // Stuff happens
          });
        },
        link: () => {
        },
      };
    },
  };
}]);

Answer 1

试试这个:

<p>
  Select a file, and you should see an alert message
</p>

<div ng-app="myApp" ng-controller="myCtrl">
    <input type="file" custom-on-change="uploadFile"/>
</div>

var myApp = angular.module('myApp', []);
myApp.directive('customOnChange', function() {
  return {
    restrict: 'A',
    link: function (scope, element, attrs) {
      var onChangeFunc = scope.$eval(attrs.customOnChange);
      element.bind('change', onChangeFunc);
    }
  };
});


myApp.controller('myCtrl', function($scope) {
    $scope.uploadFile = function(){
        var filename = event.target.files[0].name;
        alert('file was selected: ' + filename);
    };
});

这是工作fiddle