覆盖Ext.data.Connection - 最佳实践 [英] Override Ext.data.Connection - Best Practice

问题描述

我需要覆盖Ext.data.Connection以显示一个登录表单。
我现在在Ext.application.launch中执行此操作，可以按预期方式工作。

I need to override Ext.data.Connection to show a Login Form. I do this at the moment in Ext.application.launch which works as expected.

是否可以将这段代码与额外的文件？

Is it possible to swap this piece of code somewhere different like in an extra file?

推荐答案

如果您只需要确认用户未通过身份验证，您可能会考虑做别的事情。像向Ajax单例添加一个处理程序：

If you need this only to recognize when user is not authenticated you might want to consider doing something else. Like adding a handler to Ajax singleton:

function addAjaxErrorHandler(object) {

    Ext.Ajax.on('requestexception', function(conn, response, options, e) {

        var statusCode = response.status,
        errorText = null,
        captionText = response.statusText;

        // 404 - file or method not found - special case
        if (statusCode == 404) {
            Ext.MessageBox.alert('Error 404', 'URL ' + response.request.options.url + ' not found');
            return;
        }

        if (response.responseText != undefined) {
            var r = Ext.decode(response.responseText, true);

            if (r != null) {

                // 401 - not authenticated. For some reason we don't have authentication cookie anymore
                if (r.ErrorCode == 401) {
                    Ext.MessageBox.alert('Error', 'You must log in to use application', 
                        function() { 
// do something when user is not authenticated
                        object);
                    return;
                }

                errorText = r.ErrorMessage;
            }

            if (errorText == null)
                errorText = response.responseText;
        }

        if (!captionText) 
            captionText = 'Error ' + statusCode;

        Ext.MessageBox.alert(captionText, errorText);
    },
    object);        
}

然后只需从application.launch（）函数调用此函数并传递应用程序对象因此定义了范围。

Then just call this function from your application.launch() function and pass application object so the scope if defined.

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