Friday, July 28th, 2006
MS announced this week that IE7 will be pushed as a high-priority update, so we can expect it to be popular pretty quickly. Reader Shawn Lauriat brought our attention to the question: How native is IE7’s XMLHttpRequest?
The IE team have promoted the new IE7 as including native XMLHttpRequest. This is the case, insofar as you can instantiate an XHR using new XMLHttpRequest(). More importantly than the syntax, XHR will still work when ActiveX has been disabled (unlike IE6 and below).
- xhr.prototype fails. Indeed, it’s reported that any dynamic member creation fails (e.g. xhr.callId = 25; an idiom that can be useful for Call Tracking). If this is still the case, it’s not the behavior of a native object and it’s not consistent with other browsers.
- It’s also worth pointing out that IE has an option to disable native XHR. (Aside: can we switch to positive terminology already – “enable” rather than “disable” … it’s hardly a secret of HCI that options should be stated in the positive :-/). The XHR option is, reasonably enough, motivated by security. Although it sounds like XHR will default to enabled (sorry, “not disabled”), it’s still a reality that some users will be continue to be lost if you rely on XHR. Don’t throw out that IFrame just yet!
IE7 XHR – Native or Not?
Posted by Michael Mahemoff at 2:42 pm