I''m having trouble preventing my Ajax.Request from caching my data
file, which is updated and needs to be reloaded every 2-3 seconds.
Here''s what I have now:
function createSidebar() {
new Ajax.Request(''sample.json'', {
method:''get'',
requestHeaders:{"Cache-control":"no-cache"},
requestHeaders:{"If-Modified-Since":"Sat, 1 Jan 2000"},
onSuccess: function(transport) {
json = transport.responseText.evalJSON();
updateTables();
},
onFailure: function() { alert(''There was a problem loading the XML
file.'') }
});
}
window.setInterval("createSidebar()", 2000);
I have no idea if I''m using those requestHeaders correctly. I
couldn''t find any examples to go on.
Safari seems to be pretty good about not caching the file, but Firefox
might sit there for 15-20 seconds before showing any change.
Any help would be really appreciated.
Thanks,
Eric
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How about putting a time stamp at the end of the url?
Like -
var today = new date();
var rand = today.getTime();
var url = ''sample.json?rand=''+rand;
new Ajax.Request(url, {....
Thanks,
Mandy.
________________________________
From: rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org on behalf of
emont88
Sent: Tue 4/17/2007 9:52 AM
To: Ruby on Rails: Spinoffs
Subject: [Rails-spinoffs] Ajax.Request caching
I''m having trouble preventing my Ajax.Request from caching my data
file, which is updated and needs to be reloaded every 2-3 seconds.
Here''s what I have now:
function createSidebar() {
new Ajax.Request(''sample.json'', {
method:''get'',
requestHeaders:{"Cache-control":"no-cache"},
requestHeaders:{"If-Modified-Since":"Sat, 1 Jan
2000"},
onSuccess: function(transport) {
json = transport.responseText.evalJSON();
updateTables();
},
onFailure: function() { alert(''There was a problem
loading the XML
file.'') }
});
}
window.setInterval("createSidebar()", 2000);
I have no idea if I''m using those requestHeaders correctly. I
couldn''t find any examples to go on.
Safari seems to be pretty good about not caching the file, but Firefox
might sit there for 15-20 seconds before showing any change.
Any help would be really appreciated.
Thanks,
Eric
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Hey Eric, emont88 a écrit :> requestHeaders:{"Cache-control":"no-cache"}, > requestHeaders:{"If-Modified-Since":"Sat, 1 Jan 2000"},Several issues here: 1) you don''t define two headers, you define the options twice; the second time overwrites the first time. When you need multiple headers, just go: requestHeaders: { name: ''value'', name2: ''value2''... } 2) Technically, these headers are not the most appropriate. - The no-cache value of Cache-Control simply forces the server to *revalidate* anyway, which may not be good enough is the server layer is not properly coded. - The If-Modified-Since request header only works if the cache for the URL holds a properly defined Last-Modified header. Try with: requestHeaders: { ''Cache-Control'': ''no-store'' } Two neat things to look at: http://www.mnot.net/cache_docs/ (really good write-up, although it incorrectly states that Cache-Control is response-only) http://tools.ietf.org/html/rfc2616 (HTTP 1.1 spec)> Safari seems to be pretty good about not caching the file, but Firefox > might sit there for 15-20 seconds before showing any change.I assume you mean for 15 to 20" using your AJAX requests again won''t hit fresh data? -- Christophe Porteneuve a.k.a. TDD "[They] did not know it was impossible, so they did it." --Mark Twain Email: tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Spinoffs" group. To post to this group, send email to rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-spinoffs?hl=en -~----------~----~----~----~------~----~------~--~---
Thanks! Those links were really helpful and everything is working now. -Eric --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Spinoffs" group. To post to this group, send email to rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-spinoffs?hl=en -~----------~----~----~----~------~----~------~--~---