[英]Prevent cache in every Dojo xhr request on page
I'm able to intercept Dojo 1.6.1 xhr requests using IO Pipeline Topics as described here: 我能够使用IO管道主题来拦截Dojo 1.6.1 xhr请求,如下所述:
Dojo - intercepting XHR calls Dojo-拦截XHR呼叫
I would like to add a time parameter to the URL (fe &time=12345
) to prevent cache in certain (or all) xhr GET requests originating from dojox.data.JsonRestStore
(details of what I'm trying to achieve are here ). 我想在URL(fe
&time=12345
)中添加一个时间参数,以防止在源自dojox.data.JsonRestStore
某些(或全部)xhr GET请求中进行缓存(有关详细信息,请参见此处 )。 My code looks like this: 我的代码如下所示:
dojo.subscribe("/dojo/io/send", function(deferred) {
if (deferred.ioArgs.url.indexOf("restService1") > -1) {
deferred.cancel();
deferred.ioArgs.url += '&time=12345' // test value at this point
dojo.xhrGet(deferrred.ioArgs);
}
});
Basically I'm trying to cancel the request, add a string to URL and then make the request with the modified URL. 基本上,我试图取消请求,向URL添加一个字符串,然后使用修改后的URL发出请求。
This does not work at all: the request with modified URL does not end up to the server and I'm getting a lot of these errors to browser console: 这根本不起作用:带有修改的URL的请求不会最终到达服务器,并且在浏览器控制台中收到很多这些错误:
The errors occur in line 14 of dojo.js. 错误发生在dojo.js的第14行中。 The Chrome tab crashes eventually after these errors.
这些错误最终导致Chrome标签页崩溃。
I also tried just modifying deferred.ioArgs.url
and doing nothing else but that has no effect. 我还尝试仅修改
deferred.ioArgs.url
,什么也不做,但这没有任何效果。
Both dojo/io/script
and dojo/xhr
have a preventCache
parameter that does exactly what you are trying to do. dojo/io/script
和dojo/xhr
都有一个preventCache
参数,该参数确实可以完成您要尝试的操作。 So instead of trying to intercept, can you just add preventCache: true
to the request arguments? 因此,除了尝试拦截之外,您还可以在请求参数中添加
preventCache: true
吗?
http://dojotoolkit.org/reference-guide/1.6/dojo/io/script.html#dojo-io-script http://dojotoolkit.org/reference-guide/1.6/dojo/io/script.html#dojo-io-script
http://dojotoolkit.org/reference-guide/1.6/dojo/xhrGet.html#dojo-xhrget http://dojotoolkit.org/reference-guide/1.6/dojo/xhrGet.html#dojo-xhrget
The answer comes once again from Sven Hasselbach : 答案再次来自Sven Hasselbach :
/**
* Cache Prevention for Dojo xhr requests
*
* Adds no-cache header and enables dojo's preventCache feature
* for every dojo xhr call. This prevents the caching of partial
* refreshs.
*
* @author Sven Hasselbach
* @version 0.3
*
**/
dojo.addOnLoad(
function(){
if( !dojo._xhr )
dojo._xhr = dojo.xhr;
dojo.xhr = function(){
try{
var args = arguments[1];
args["preventCache"] = true;
args["headers"] = { "cache-control": "no-cache" };
arguments[1] = args;
}catch(e){}
dojo._xhr( arguments[0], arguments[1], arguments[2] );
}
}
)
http://openntf.org/XSnippets.nsf/snippet.xsp?id=cache-prevention-for-dojo-xhr-requests http://openntf.org/XSnippets.nsf/snippet.xsp?id=cache-prevention-for-dojo-xhr-requests
Tried it out and it does exactly what I was looking for by adding &dojo.preventCache=1359366392301
parameter to the xhr URLs. 尝试了一下,并通过向xhr URL添加
&dojo.preventCache=1359366392301
参数来实现我想要的功能。 And it seems to add a cache-control header too. 而且似乎也添加了一个缓存控制标头。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.