ExtJS 4.2 DatePicker Multiselect 在控制器中捕获事件 [英] ExtJS 4.2 DatePicker Multiselect catch event in controller

问题描述

我正在使用 MVC 架构在 ExtJS 4.2 中创建自定义日期选择器.这个想法是该组件允许用户一次输入/选择多个日期，但是我遇到了一些问题:

I am creating a custom date-picker in ExtJS 4.2 using the MVC architecture. The idea is that the component allows a user to input / select multiple dates at a time however I am having a few issues:

• 我的 selectedDates 变量是一个对象，我不知道如何让它返回日期列表.
• 当您打开一个新窗口时，选择器会记住上次打开该窗口时之前选择的日期.我认为当你在 Ext 中close一个窗口时，组件被破坏?

• My selectedDates variable is an object and I don't how how to make it return the list of dates.
• When you open a new window the picker remembers the previously selected dates from the last time that the window was open. I thought that when you close a window in Ext, the components are destroyed?

要粘贴到我的帖子中的代码有点多，但我创建了一个 在这里小提琴.我在点击时放置了一个按钮，我想获取所选日期 - 有人可以看看吗?

There is a little too much code to paste into my post but I've created a fiddle here. I placed a button where on click, I want to get the selected dates - could someone please take a look?

推荐答案

当你在 Ext 中define一个类时，你在配置中指定的属性存在于原型链中，不强> 对象实例本身.除非在调用组件的构造函数时将新对象分配给 selectedDates，否则您正在修改对 单个 对象的 same 引用.当您关闭一个窗口时，对象被销毁，但原型/类定义仍然存在.

When you define a class in Ext the properties you specify in the configuration exist in the prototype chain, not the object instance itself. Unless a new object is assigned to selectedDates when the component's constructor is called then you are modifying a the same reference to a single object. When you close a window the object is destroyed but the prototype / class-definition still exists.

如果您想使用复合类型作为默认" 值，那么您应该在对象的constructor 方法中解决这些问题.例如:

If you want to use composite types as "default" values then you should resolve these in the object's constructor method. For example:

Ext.define('MyClass', {
    extend: 'Ext.Component',
    // ...
    selectedDates: null,

    constructor: function(args){
        args = args || {};
        Ext.applyIf(args, {
            selectedDates: {}
        });
        this.callParent([args]);
    }
});

<小时>

获取您的 selectedDates 是简单的部分，这只是迭代对象并将值添加到数组的情况 - 此外您唯一缺少的是 itemId 在您的选择器组件上，以便您可以轻松获取对它的引用，例如:

---

Getting your selectedDates is the easy part, it's just a case of iterating over your object and adding the values to an array - further to that the only thing you are missing is an itemId on your picker component so that you can easily obtain a reference to it, for example:

Ext.define('HighlightableDatePicker', {

    // ...

    getSelectedDates: function(){
        var dates = [];
        Ext.iterate(this.selectedDates, function(key, val){
            dates.push(val);
        });
        dates.sort();
        return dates;
    }
});

// Ext.Window items config...
{
    xtype: 'highlightdate',
    itemId: 'datePicker'
},
{
    xtype: 'button',
    text: 'Get Selected Dates',
    handler: function(){
        var picker = this.up('window').down('#datePicker');
        console.log( picker.getSelectedDates() );
    }
}

»更新小提琴

注意:您的小提琴中没有 MVC 但同样的原则适用 - 您已经有了 handleSelectionChanged可以触发自定义事件的方法，例如:

Note: there's no MVC in your fiddle but the same principle applies - you already have a handleSelectionChanged method where you could fire a custom event, for example:

handleSelectionChanged: function(cmp, date){
    // after existing logic ...
    this.fireEvent('dateselection', this.getSelectedDates());
}

现在选择器组件有一个 itemId，您的控制器将能够监听事件.

Now that the picker component has an itemId, your controller will be able to listen for the event.

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