javascript - NSString from webview with JSON string -


i have webview i'm calling method returns result of json.stringify(); stored in database , used later restore state of page in webview.

nsstring *data = [self.browser stringbyevaluatingjavascriptfromstring:@"course.serialize();"]; [self.course storerawserializeddata:data];

when retrieved database (core data) i'm injecting loaded html page source so:

-(void)connectiondidfinishloading:(nsurlconnection *)connection {     if(_data){         nsstring* content = [[nsstring alloc] initwithdata:_data                                                   encoding:nsutf8stringencoding];         _data = nil;         _jsready = yes;          nsstring *data = @"";         if(self.course.returnrawserializeddata){             data = [data stringbyappendingstring:@"<script type=\"text/javascript\">var restoredata=%@;</script>"];             data = [nsstring stringwithformat:data, self.course.returnrawserializeddata];         }         //inject content page         content = [data stringbyappendingstring:content];         //load modified html string         [self.browser loadhtmlstring:content baseurl:_url];     } }

the problem json being invalid after trip:

the json returned webview is:

{"status":"incomplete","data_json":"{\"colour\":\"#000000\"}"}

and after injecting looks this:

<script type=\"text/javascript\">var restoredata={"status":"incomplete","data_json":"{\"colour\":\"#000000\"}"};</script>

the page returns syntaxerror: json parse error: unexpected identifier "object"

when wrap single or double quotes in stringbyappendingstring method page returns syntaxerror: json parse error: expected '}'

it works when escape double quotes (manually) don;t know how programatically, expected string returned stringbyevaluatingjavascriptfromstring escaped used within double quotes.

you can consider following solution,

you base64 encode nsstring want inject in objective-c reverse in javascript.


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