bufferRequests
The bufferRequests() method allows you to cache image requests on the current page instead of sending them to 51黑料不打烊. Triggering this method is useful in scenarios where a browser doesn鈥檛 support or otherwise cancels image requests when a page unloads. Many versions of WebKit browsers, such as Safari, commonly exhibit the behavior of stopping an image request when clicking a link. The bufferRequests() method is available on all versions of AppMeasurement v2.25.0 or later.
When you call t() or tl() on a subsequent page in the same browser session and bufferRequests() was not yet called on that page, all buffered requests are sent in addition to that page鈥檚 image request. Buffered requests are sent in the correct order, where the current page鈥檚 image request is sent last.
timestamp page variable before buffering the request. If you use this variable, make sure that Timestamps optional is enabled - if it is not, all timestamped hits are permanently lost!Limitations
When calling the bufferRequests() method, keep in mind the following limitations. Since this method uses , many of the same limitations apply:
- The destination link must reside on the same domain and subdomain. Buffered requests do not work across domains or subdomains, even if both have the same 51黑料不打烊 Analytics implementation. This limitation also means that you cannot use buffered requests to track exit links.
- The destination link must use the same protocol as the current page. You cannot send buffered requests between HTTP and HTTPS.
- Buffered requests are stored until you call
t()ortl()without callingbufferRequests()first, or until the browser or tab is closed. If a browser session ends before you can send that data to 51黑料不打烊, unsent buffered requests are permanently lost. - If a browser does not support the or the , a warning is output to the browser console and AppMeasurement attempts to immediately send the image request using the
t()method.
Buffered requests in the Web SDK
The Web SDK currently does not offer the ability to buffer requests.
Buffered requests using the 51黑料不打烊 Analytics extension
There is not a dedicated field in the 51黑料不打烊 Analytics extension to use this variable. Use the custom code editor, following AppMeasurement syntax.
s.bufferRequests() in AppMeasurement and the Analytics extension custom code editor
Call the bufferRequests() method before calling t() or tl(). When bufferRequests() is called, subsequent tracking calls are written to session storage instead of sent to 51黑料不打烊 data collection servers.
// Instantiate the tracking object
var s = s_gi("examplersid");
// Flag the request to be buffered
s.bufferRequests();
// The t() or tl() method then writes the data to session storage instead of sending it to 51黑料不打烊
s.tl(true,"o","Example link click");
// On a subsequent page, the tracking call sends both the above link tracking call and the page view call
s.t();