Ynmc — Mon, 26 Jun 2006 06:27:00 GMT

作�? ynmc
原文地址:http://www.aygfsteel.com/ynmc/archive/2006/06/26/55149.html�Ƣ迎转蝲,请保留出�?

在用DWR传输xml文档�Q�document�Q�或者节点（Element�Q�的时候，通过DWR Debug��面从函��C��直接取返回数据时�Q�由于DWR对于Firefox的支持度比IE好的原因�Q�在FireFox下面能正常运行，在IE下会报[Ojbect Error]。我用DWR1.1和DWR M2两个版本都进行了��试�Q�都会报出同��L��错误�?br />
关于�q�个错误�Q�我已经和DWR的作者joe walker通过user-list联系�q�，他表�C�由于时间的问题�Q�在ie下面的确有一些bug没有来得及处理�?br />
同时�Q�我又做了一些测试，发现其实�q�个问题��实如Joe后来回复的邮件所��_��是个没有什么意义的��问题。在IE下其实也是可以传递Document或者Element数据的，只是在DWR Debug��面下，直接从函��C��q�回Document或者Element�Ӟ��DWR弹出的显�C�元素的对话框。这个时候DWR隐式的将Document或者Element对象转换成了String�Q�而DWR对FireFox支持的较好，没有问题�Q�而在IE中就会弹出Object Error错误�?br />
所以对实际应用来讲�Q�这个bug完全可以忽略�Q�因为除了debug以外�Q�在使用中没有�Q何媄响�?br />
Joe 最后回复了邮�g,也给��Z��处理办法,他的意思是�q�种情况出现的比较少,意义不大�Q�我��是听他说了�q�句话之后发��C��开始自��q��理解有误�Q�看来多与�h交流是非帔R��要的啊。）

下面是邮件原�?

From: Joe Walker <joseph.walker@...>
Subject: Re: Re: [new user]problem: can't send/return DOM object?
Newsgroups: gmane.comp.java.dwr.user
Date: 2006-06-26 08:32:37 GMT (1 day and 48 minutes ago)
Expires: This article expires on 2006-07-10

The DOM converter will convert from browser DOM objects to server side DOM objects, but it wasn't designed to convert from browser strings to SS DOM.

How do you parse a browser string into a browser DOM?

This can't be done without some cross-browser tweaks. Take a look at DWREngine._unserializeDocument(). It is a private method to DWREngine, so you should not use it directly, but you can copy it.

DWREngine._unserializeDocument = function(xml) {
var dom;
if (window.DOMParser) {
    var parser = new DOMParser();
    dom = parser.parseFromString(xml, "text/xml");
    if (!dom.documentElement || dom.documentElement.tagName == "parsererror") {
      var message = dom.documentElement.firstChild.data;
      message += "\n" + dom.documentElement.firstChild.nextSibling.firstChild.data;
      throw message;
    }
    return dom;
}
else if ( window.ActiveXObject) {
    dom = DWREngine._newActiveXObject(DWREngine._DOMDocument);
    dom.loadXML(xml);
    // What happens on parse fail with IE?
    return dom;
}
else {
    var div = document.createElement ('div');
    div.innerHTML = xml;
    return div;
}
};

There is bug in IE is that I mentioned in a previous post. The bug is that HTML nodes do not have the DOM properties to allow DWR to marshall them properly. This might be something that DWR can work around, but to date I have never seen the need to fix the bug. Sending the browser HTML DOM to the server isn't all that useful since the server gave it to the browser in the first place.

Joe.

目前的ajax框架中DWR的文档是做的比较好的�Q�这也有利于�q�大的开发者�?br />DWR 官方站点�Q?br />http://getahead.ltd.uk/dwr/

DWR User-list�Q�作者会�l�常对在�q�里提出的问题进行回�{�，目前已经有约5000条记录）�Q?br />http://news.gmane.org/gmane.comp.java.dwr.user

最后感谢Joe Walker�Q�他不仅写出了DWR�Q�还非常热心的回�{�了我和其它user的问题�?br />

Ynmc 2006-06-26 14:27 发表评论

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