从javascript DevExpress访问对象 [英] access object from javascript DevExpress

问题描述

我想知道为什么我无法通过javascript通过ClientInstanceName访问对象。

I wonder why I cant access Object by ClientInstanceName from javascript.

示例：

function NextStep(pageControl) {
        currentStep = pageControl.GetActiveTabIndex();
        switch (currentStep) {
            case 0:
                selectedRowsCount = GridViewClient.GetSelectedRowCount();
break;
}

错误是：

没有GridViewClient的定义；

There is no definition for GridViewClient;

但是ClientInstanceName设置为GridViewClient

but ClientInstanceName is set to GridViewClient

在ASPxPageControl的其他选项卡上有thos网格，因此这些选项卡不可见，但是我想做的是在显示它之前刷新其中之一，并且我想使用客户端ASPxGridViewClient.Refresh（）。

Case is that I have thos grid on other tabs in ASPxPageControl so that these aren't visible but What I want to do is to refresh one of it before displaying it and I wanted to use client side ASPxGridViewClient.Refresh().

推荐答案

这意味着，每次激活新选项卡时，ASPxPageControl都会向服务器发送回调。此回调对于获取活动选项卡的内容并将其显示在客户端上是必需的。因此，这种方法减少了将少量内容发送到客户端时加载页面所需的时间。请注意，如果EnableCallbacks设置为true，则ASPxPageControl会将其内容缓存在客户端。因此，当您激活已经处于活动状态的Tab时，不会发送回调，因此将使用纯客户端代码激活Tab。

This means that the ASPxPageControl sends a callback to the server every time you activate a new tab. This callback is necessary to obtain the content of the active tab and show it on the client. So, this approach reduces the time needed to load a page as a small content is sent to the client side. Note, that if the EnableCallbacks is set to true, the ASPxPageControl caches its contents on the client side. So, when you activate a Tab which was already active, a callback is not sent and thus tab is activated using the pure client side code.

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