Question

我有一个html选择选项

<select>
    <option ng-repeat="field in filter.fields" value="{{field.id}}">{{field.name}}</option>
</select>

我正在从ng-repeat迭代，我想基于一个可选择的字段来禁用选项

<select>
    <option ng-repeat="field in filter.fields" {field.selectable==true?enable:disable} value="{{field.id}}">{{field.name}}</option>
 </select>

我怎样才能用角度来实现这个目标？

Answer 1

假设您有这样的结构：

  $scope.filter = {
    fields: [
      {id: 1, name: "a", selectable: false},
      {id: 2, name: "asdf", selectable: true},
      {id: 3, name: "qwet", selectable: false},
      {id: 4, name: "qnjew", selectable: true},
      {id: 5, name: "asdjf", selectable: false}
    ]
  };

这应该适合你：

  <select>
    <option ng-repeat="field in filter.fields" ng-disabled="field.selectable" value="{{field.id}}">{{field.name}}</option>
  </select>

Answer 2

虽然ng-disabled属性在技术上有效，但在使用ng-repeat on选项时可能会遇到错误。这是一个众所周知的问题，正是角度团队创建ng-options的原因。将ng-options和ng-disabled一起使用还没有角度实现，但 Alec LaLonde 创建了这个可以添加和使用的自定义指令。 See the issue forum here: https://github.com/angular/angular.js/issues/638和jsfiddle from that post。

angular.module('myApp', [])
.directive('optionsDisabled', [ '$parse', function($parse) {
        var disableOptions = function($scope, attr, $element, data, fnDisableIfTrue) {
            $element.find('option:not([value="?"])').each(function(i, e) { //1
                var locals = {};
                locals[attr] = data[i];
                $(this).attr('disabled', fnDisableIfTrue($scope, locals));
            });
        };

        return {
            priority: 0,
            require: 'ngModel',
            link: function($scope, $element, attributes) { //2
                var expElements = attributes.optionsDisabled.match(/^\s*(.+)\s+for\s+(.+)\s+in\s+(.+)?\s*/),
                    attrToWatch = expElements[3],
                    fnDisableIfTrue = $parse(expElements[1]);
                $scope.$watch(attrToWatch, function(newValue, oldValue) {
                    if (!newValue) return;

                    disableOptions($scope, expElements[2], $element, newValue, fnDisableIfTrue);
                }, true);

                $scope.$watch(attributes.ngModel, function(newValue, oldValue) { //3
                    var disabledOptions = $parse(attrToWatch)($scope);
                    if (!newValue) return;

                    disableOptions($scope, expElements[2], $element, disabledOptions, fnDisableIfTrue);
                });
            }
        };
    }
]);
//1 refresh the disabled options in the select element
//2 parse expression and build array of disabled options
//3 handle model updates properly

function OptionsController($scope) {
    $scope.ports = [{name: 'http', isinuse: true},
                    {name: 'test', isinuse: false}];

    $scope.selectedport = 'test';
}

Answer 3

这实际上是一个相当古老的问题。在Angular（angular 1.4+）的更高版本中，您有ngOptions指令。这是链接： -

https://docs.angularjs.org/api/ng/directive/ngOptions

现在有一种处理这种情况的语法： -

label disable when disable for value in array track by trackexpr

我想我会把它放在以防其他人访问此页面。

Angular HTML Select选项禁用和启用

3 个答案: