Prevent cache in every Dojo xhr request on page

Question

I\'m able to intercept Dojo 1.6.1 xhr requests using IO Pipeline Topics as described here:

Dojo - intercepting XHR calls

I would like to add a time para

Answer 1

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.

Answer 2

Both dojo/io/script and dojo/xhr have a preventCache parameter that does exactly what you are trying to do. So instead of trying to intercept, can you just add preventCache: true to the request arguments?

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