Marcus Pridham created CB-8468:
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Summary: Applications freezes if breakpoint hits JavaScript
callback invoked from native
Key: CB-8468
URL: https://issues.apache.org/jira/browse/CB-8468
Project: Apache Cordova
Issue Type: Bug
Components: iOS
Reporter: Marcus Pridham
Priority: Minor
It you attach Safari to your application and hit a breakpoint in a Cordova
callback the application freezes and you can't step through or continue. This
only happens in breakpoints in the native to JavaScript callbacks. JavaScript
breakpoints in other areas work fine.
A simple way to reproduce is to use the globalization plugin. Attach safari
and put a breakpoint in the success callback.
navigator.globalization.getPreferredLanguage(function() {
console.log("test"); // Will freeze if breakpoint set here
}, function() {});
The problem seems to have to do with the webview
stringByEvaluatingJavaScriptFromString. It is a synchronous call that can
return the result of the JavaScript back to the native. The native code will
crash if a breakpoint is hit while trying to execute the JavaScript. The
workaround is to have your callback code in a setTimeout so it is not in the
same context as the native stringByEvaluatingJavaScriptFromString call.
A workaround:
Open cordova.js and around line 281 replace:
callbackFromNative: function(callbackId, isSuccess, status, args, keepCallback)
{
With:
callbackFromNative: function(callbackId, isSuccess, status, args,
keepCallback) {
setTimeout(function() {
cordova.callbackFromNative2(callbackId, isSuccess, status, args,
keepCallback);
}, 0);
},
callbackFromNative2: function(callbackId, isSuccess, status, args,
keepCallback) {
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