iPhone 4 Pass JSON string to Javascript within a Web View

Question

I know this is possible in Java with Javascript handler :

   graphView.addJavascriptInterface(handler, "javahandler");
   graphView.loadUrl("file:///android_asset/html/show_data_from_file.html");

    JSONObject json = new JSONObject();
    json.put("data", jsonArray);
    json.put("label","labelString");
    handler.json = json;

Within the javascript page, the "javahandler" would have "json" object, which I can get the data array and the label to display on the page.

Is there something similar for iOS? I'm very new to web programming with iOs, and would appreciate your help!

sElanthiraiyan · Accepted Answer · 2011-10-08 07:42:06Z

2

You can use stringByEvaluatingJavascriptFromString to call a javascript method and pass your JSON string through that method,

[yourWebViewInstance stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"useThisJSONString(%@)", JSONString]];

answered Oct 8, 2011 at 7:42

sElanthiraiyan

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2 Comments

Alex Stone Over a year ago

are there any limits on the string length with this method? I want to pass about 700kb of data.

sElanthiraiyan Over a year ago

I guess no, But this may reduce the performance of your javascript.

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