ExtJS:使用远程加载的单例值来存储定义

我在尝试弄清楚如何做到这一点时遇到了一些麻烦(如果甚至可能的话)。

我有一个应用程序使用parse.com来存储它的数据,事情是我希望每个用户有一个不同的parse.com帐户,所以他们的数据集不会相交。 所以我创建了一个存储用户的appId和apiKey的单身人士(设置),这是从我管理的一般parse.com帐户加载的,并包含每个用户的电子邮件,appId和apiKey,因此当他们登录到应用程序时,用户的appId和apiKey。

事情是我需要在我的商店的定义中使用这些设置,appId和apiKey,因为我需要将它们发送到标题中。 我做了一些测试,试图在应用程序启动时设置单例的全局变量,但在商店定义时,这两个“全局变量”都为空,因为应用程序尚未启动。

这是我的一些代码,所以我可以让自己更清楚一些,因为我知道这不是最容易理解的事情。

的application.js

Ext.define('Settings', {
    singleton: true,        
    appId: null,
    apiKey: null
});


Ext.define('MyApp.Application', {
    extend: 'Ext.app.Application',        
    name: 'MyApp',        
    stores: [],
    launch: function () {
        Ext.create('MyApp.store.Settings').load({
            params: {
                'where': '{"email": "useremail@gmail.com"}' //email is supposed to be a user input but for the sakes of testing I just made it static
            },
            callback: function(records){
                var s = records[0];
                Settings.appId = s.get('appId');
                Settings.apiKey = s.get('apiKey');
                Parse.initialize(Settings.appId, Settings.apiKey);
            }
        });
    },


    onAppUpdate: function () {
        Ext.Msg.confirm('Application Update', 'This application has an update, reload?',
            function (choice) {
                if (choice === 'yes') {
                    window.location.reload();
                }
            }
        );
    }
});

商店

Ext.define('MyApp.store.Things', {
    extend: 'Ext.data.Store',        
    model: 'MyApp.model.Thing',        
    proxy: {
        type: 'rest',
        api: {
            read: 'https://api.parse.com/1/classes/Thing',
            create: 'https://api.parse.com/1/classes/Thing'
        },
        reader: {
            type: 'json',
            rootProperty: 'results'
        },
        useDefaultXhrHeader: false,
        withCredentials: false,
        headers: {
            'X-Parse-Application-Id': Settings.appId, //this is null at the time of definition, but I want it to be the newly fetched value at the time of app launch
            'X-Parse-REST-API-Key': Settings.apiKey, //this is obviously null as well
            'Content-Type': 'application/json'
        }
    },
    autoLoad: true,
    autoSync: true
});

这是怎么回事?

顺便说一句,如果有人可以想到这个线程的专有名称,请随时更改或建议。


试试像这样:

Ext.define('Settings', {
    singleton: true,
    appId: null,
    apiKey: null
});

Ext.define('MyApp.store.Things', {
    extend: 'Ext.data.Store',

    model: 'MyApp.model.Thing',

    proxy: {
        type: 'rest',
        api: {
            read: 'https://api.parse.com/1/classes/Thing',
            create: 'https://api.parse.com/1/classes/Thing'
        },
        reader: {
            type: 'json',
            rootProperty: 'results'
        },
        useDefaultXhrHeader: false,
        withCredentials: false,
    },
    //autoLoad: true,
    autoSync: true
});

Ext.define('MyApp.Application', {
    extend: 'Ext.app.Application',

    name: 'MyApp',


    stores: ['Things'],
    launch: function() {
        var settings = Ext.create('MyApp.store.Settings');
        settings.on('load', function() {
            var things = Ext.getStore('Things');
            things.getProxy().setHeaders({
                'X-Parse-Application-Id': Settings.appId, 
                'X-Parse-REST-API-Key': Settings.apiKey, 
                'Content-Type': 'application/json'
            });
            things.load();
        });

        settings.load({
            params: {
                'where': '{"email": "useremail@gmail.com"}' //email is supposed to be a user input but for the sakes of testing I just made it static
            },
            callback: function(records) {
                var s = records[0];
                Settings.appId = s.get('appId');
                Settings.apiKey = s.get('apiKey');
                Parse.initialize(Settings.appId, Settings.apiKey);
            }
        });
    },


    onAppUpdate: function() {
        Ext.Msg.confirm('Application Update', 'This application has an update, reload?',
            function(choice) {
                if (choice === 'yes') {
                    window.location.reload();
                }
            }
        );
    }
});

我建议使用路由来实现这一点,因为你使用的是ExtJs 6.它完全是开箱即用的,但是它对于你的情况是非常理想的。 通过这种方式,您可以简单地确保在调用路由并且加载了应用程序的一部分时,您始终可以执行一些检查。 例如,这对于检查用户凭证非常有用。 有关路线的更多信息可以在这里找到。 当你想通过路由处理用户会话时,这是一个很棒的帖子。

单身人士:

Ext.define('Settings', {
    singleton: true,        
    appId: null,
    apiKey: null
});

基地商店:

Ext.define('Base', {
    extend: 'Ext.data.Store',
    alias: 'store.base',
    storeId: 'base',

    autoLoad: false,

    proxy: {
        type: 'rest',
        useDefaultXhrHeader: false,
        withCredentials: false
    },

    listeners: {
        beforeload: function(store, operation, eOpts) {
            store.getProxy().headers = {
                'X-Parse-Application-Id': Settings.appId,
                'X-Parse-REST-API-Key': Settings.apiKey,
                'Content-Type': 'application/json'
            }
        }
    }
});

东西商店:

Ext.define('MyApp.store.Things', {
    extend: 'MyApp.store.Base',        
    alias: 'store.things',
    model: 'MyApp.model.Thing',        

    storeId: 'things',

    requires: [
        'Settings'
    ],

    proxy: {
        api: {
            read: 'https://api.parse.com/1/classes/Thing',
            create: 'https://api.parse.com/1/classes/Thing'
        },
        reader: {
            type: 'json',
            rootProperty: 'results'
        }
    },
    autoLoad: false, // --> set to false
    autoSync: true
});

您的主控制器:

Ext.define('MyApp.view.main.MainController', {
    extend : 'Ext.app.ViewController',

    requires: [
        'Settings'
    ],

    stores: [
        'Things'
    ],

    routes : {
        'user/:id' : {
            before  : 'onBeforeUser',
            action  : 'onUser'
        }
    },

    onBeforeUser : function(id, action) {
        Ext.create('MyApp.store.Settings').load({
            params: {
                'where': '{"email": "useremail@gmail.com"}' //email is supposed to be a user input but for the sakes of testing I just made it static
            },
            callback: function(records){
                var s = records[0];
                Settings.appId = s.get('appId');
                Settings.apiKey = s.get('apiKey');
                Parse.initialize(Settings.appId, Settings.apiKey);
                action.resume();
            }
        });

        // or even better

        Ext.Ajax.request({
            url: 'url/to/the/api',
            params: {
                'where': '{"email": "useremail@gmail.com"}' //email is supposed to be a user input but for the sakes of testing I just made it static
            },
            success: function(response, opts) {
                var obj = Ext.decode(response.responseText);

                Settings.appId = obj.appId;
                Settings.apiKey = obj.apiKey;
                Parse.initialize(Settings.appId, Settings.apiKey);
                action.resume();
            },
            failure: function(response, opts) {
                action.stop(true);
            }
        });
    },

    onUser : function(id) {
        Ext.getStore('things').load();
    }
});

我认为这个问题可以通过将代理定义移动到'Things'store的构造函数来解决,如下所示。

Ext.define('MyApp.store.Things', {
    extend: 'Ext.data.Store',

    model: 'MyApp.model.Thing', 
    autoLoad: true,
    autoSync: true,

    constructor: function(config) {

        config = Ext.apply({
            proxy: {
                type: 'rest',
                api: {
                    read: 'https://api.parse.com/1/classes/Thing',
                    create: 'https://api.parse.com/1/classes/Thing'
                },
                reader: {
                    type: 'json',
                    rootProperty: 'results'
                },
                useDefaultXhrHeader: false,
                withCredentials: false,
                headers: {
                    'X-Parse-Application-Id':  Settings.appId,
                    'X-Parse-REST-API-Key':  Settings.appId,
                    'Content-Type': 'application/json'
                }
            }
        }, config);
        this.callParent([config]);
    }
}); 

当代理定义位于构造函数内部时,Settings.appId和Settings.apiKey仅在创建'MyApp.store.Things'的实例时解析。

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