How to prevent Ajax caching

Question

I'm created this class to fetch a file from web to check for new version using Ajax. This code run on a Windows gadget, on IE8. But I'm having trouble because of the cache. Is there a way to fix this Ajax class to disable cache?

PS: I don't use any library or frameworks.

var ClassAjax = function() { this.data = null; var that = this; this.get = function(url, send) { var ajax = new function ObjAjax() { try{ return new XMLHttpRequest(); } catch(e){try{ return new ActiveXObject("Msxml2.XMLHTTP"); } catch(e){ return new ActiveXObject("Microsoft.XMLHTTP"); }} return null; } ajax.onreadystatechange = function() { if(ajax.readyState == 1) { that.onLoading(); } if(ajax.readyState == 4) { that.data=ajax.responseText; that.onCompleted(that.data); } } ajax.open("GET", url, true); ajax.send(send); }; this.onLoading = function() { //function called when connection was opened }; this.onCompleted = function(data) { //function called when download was completed }; } var request = new ClassAjax(); request.onCompleted = function(data) { alert(data); } request.get('http://exemple.com/lastversion.html', null);

Victor · Accepted Answer · 2017-04-10 03:50:19Z

You can pass the current timestamp as a variable in the url, like this :

var timestamp = new Date().getTime(); ajax.open("GET", url+'?ts='+timestamp, true);

Also, you can force the page to be reloaded on server-side, using the proper headers

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