在页面上的每个Dojo xhr请求中防止缓存 [英] Prevent cache in every Dojo xhr request on page
问题描述
我可以使用 IO管道主题拦截Dojo 1.6.1 xhr请求,如下所述:
尝试它,它正好与我正在寻找的是添加& dojo.preventCache = 1359366392301
参数到xhr U的RL。而且似乎也添加了一个缓存控制头。
I'm able to intercept Dojo 1.6.1 xhr requests using IO Pipeline Topics as described here:
I would like to add a time parameter to the URL (f.e. &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). My code looks like this:
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.
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:
The errors occur in line 14 of dojo.js. The Chrome tab crashes eventually after these errors.
I also tried just modifying deferred.ioArgs.url
and doing nothing else but that has no effect.
The answer comes once again from 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
Tried it out and it does exactly what I was looking for by adding &dojo.preventCache=1359366392301
parameter to the xhr URLs. And it seems to add a cache-control header too.
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