Angular - 存储和读取复选框列表，其中包含localStorage中的状态

I'm trying to store a checkbox list with each checkboxes values in the localStorage but I'm always getting a dupes error within ng-repeat or a Unexpected token o in JSON at position 1, should I use JSON.parse on the object.

我正在尝试在localStorage中存储一个带有每个复选框值的复选框列表,但是我总是在ng-repeat中得到一个dupes错误,或者在位置1的JSON中得到一个Unexpected token o,如果我在对象上使用JSON.parse。

Basically this is an options list that I later want to load but I also want to load the states when I access the menu, should they exist in the localStorage.

基本上这是一个我后来想要加载的选项列表,但我还想在访问菜单时加载状态,如果它们存在于localStorage中。

controller.js

 var initialAlarmColumns = [{
                    columnName: "Alarm",
                    value: true
                }, {
                    columnName: "Description",
                    value: true
                }, {
                    columnName: "Acknowledged by",
                    value: false
                }];

                if(localStorage.getItem('alarmColumns') === null){
                    localStorage.setItem('alarmColumns', JSON.stringify(initialAlarmColumns));
                    self.alarmColumns = initialAlarmColumns;
                }
                else{
                    self.alarmColumns = JSON.parse(localStorage.getItem('alarmColumns'));
                }

                self.setAlarmColumns = function(columnsChecked){
                    localStorage.setItem('alarmColumns', JSON.stringify(columnsChecked));
                };

optionsView.html

<ul class="alarmColumnOptions" ng-repeat="alarmOptions in $ctrl.alarmColumns">
    <li><label><input type="checkbox" name="alarmOptions.columnName" ng-model="alarmOptions.value" ng-change="$ctrl.setAlarmColumns($ctrl.alarmColumns)"> {{alarmOptions.columnName}}</label></li>
</ul>

I'm using simple localStorage and not the directive, due to another unrelated issue in my app.

由于我的应用程序中存在另一个不相关的问题,我使用简单的localStorage而不是指令。

EDIT: here is the code preview in plunkr

编辑:这是plunkr中的代码预览

1 个解决方案

#1

Found out the issue. I was missing track by $index in the ng-repeat.

找到了问题。我在ng-repeat中错过了$ index的跟踪。

    <h3>Alarm Columns</h3>
    <ul class="alarmColumnOptions" ng-repeat="alarmOptions in alarmColumns track by $index">
        <li><label><input type="checkbox" name="alarmOptions.columnName" ng-model="alarmOptions.value" ng-change="setAlarmColumns(alarmColumns)"> {{alarmOptions.columnName}}</label></li>
    </ul>

js changes:

var initialAlarmColumns = [{
                columnName: "Alarm",
                value: true
            }, {
                columnName: "Description",
                value: true
            }, {
                columnName: "Acknowledged by",
                value: false
            }];

        if (localStorage.getItem('alarmColumns') === null) {
            localStorage.setItem('alarmColumns', JSON.stringify(initialAlarmColumns));
        }

        $scope.alarmColumns = JSON.parse(localStorage.getItem('alarmColumns'));

        $scope.setAlarmColumns = function(columnsChecked) {
            localStorage.setItem('alarmColumns', JSON.stringify(columnsChecked));
        };