Browser 7.3 XMLHttpRequest Issue (Known Issue)

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Article Metadata

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Tested with

Devices(s): All devices with Browser 7.3

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Compatibility

Platform(s): Symbian^3, Symbian S60 5th Edition, Symbian S60 3rd Edition FP2

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Article

Created: User:Nokia Developer KB (23 Aug 2011)

Last edited: lpvalente (16 Jun 2012)

Description

When a Symbian Web Runtime widget, started from the Applications menu, is trying to access the internet for the first time, an 'Allow connection to Network?' prompt is shown. In previous browser versions, answering 'No' fires an onoffline event and XMLHttpRequest completes with status code 0. In Browser 7.3, denying network access fires an onoffline event, but XMLHttpRequest does not complete.

Solution

The solution is to implement a timer that aborts the XMLHttprequest if it is taking too long to complete. This will ensure that the request won’t be left hanging forever. Also, please note that usage of online/offline API is recommended in all WRT widgets.

var timeOutDelay = 10000; // 10 sec
var timerId;
 
var xmlHttpRequest = new XMLHttpRequest();
xmlHttpRequest.open("GET", "http://www.nokia.com", true);
 
xmlHttpRequest.onreadystatechange = function(){
    if (xmlHttpRequest.readyState == 4 && xmlHttpRequest.status == 200) {
        clearTimeout(timerId);
        alert(xmlHttpRequest.responseText);
    }
}   
xmlHttpRequest.send(null);
timerId = setTimeout(xmlHttpRequestOnTimeOut, timeOutDelay);
 
function xmlHttpRequestOnTimeOut(){
   xmlHttpRequest.abort();
   alert("XMLHttpRequest timed out");
}