Reading a Javascript object from UIWebview

Question

I have a webpage which has data within a javascript object in it. I would like to get access to this data from the UIWebView to use within the native ObjectiveC code.

I have tried a number of ways

In the delegate method -(void) webViewDidFinishLoad:(UIWebView *) webView I tried accessing the object using

[myWebView stringByEvaluatingJavaScriptFromString:@""];

but there didnt seem an easy way to pull in the structured data

Other option I thought was to

just load the HTML as a string and parse it but this seemed like a really ugly approach.

An example of the HTML I have is.

<html>
    <head>
        <script type="text/javascript">
        $(function() {
          myData[0] = {
                name: 'data title',
                data: [
                [1281880800000, 4],[1282485600000, 12],[1283090400000, 15],[1283695200000, 107],[1284300000000, 11],[1284904800000, 14],[1285509600000, 3],[1286110800000, 10],[1286715600000, 12],[1287320400000, 2],[1287925200000, 304],[1288530000000, 18],[1289134800000, 22],[1289739600000, 5],[1290344400000, 6],[1290949200000, 14],[1291554000000, 6],[1292158800000, 10],[1292763600000, 9],[1293368400000, 0],[1293973200000, 4],[1294578000000, 2],[1295182800000, 17],[1295787600000, 6],[1296392400000, 4],[1296997200000, 7],[1297602000000, 50],[1298206800000, 2],[1298811600000, 3],[1299416400000, 3],[1300021200000, 301],[1300626000000, 1],[1301230800000, 72],[1301839200000, 6],[1302444000000, 5],[1303048800000, 2],[1303653600000, 5],[1304258400000, 7],[1304863200000, 8],[1305468000000, 34],[1306072800000, 12],[1306677600000, 6],[1307282400000, 2],[1307887200000, 2],[1308492000000, 7],[1309096800000, 30],[1309701600000, 63],[1310306400000, 3],[1310911200000, 9],[1311516000000, 3],[1312120800000, 4]             ],
                color: '#ff1430'
            };

            myData[1] = {
                name: 'Other Data',
                data: [
                [1281880800000, 29],[1282485600000, 402],[1283090400000, 0],[1283695200000, 1],[1284300000000, 1],[1284904800000, 0],[1285509600000, 0],[1286110800000, 0],[1286715600000, 1],[1287320400000, 10],[1287925200000, 2],[1288530000000, 0],[1289134800000, 10],[1289739600000, 1],[1290344400000, 3],[1290949200000, 26],[1291554000000, 2],[1292158800000, 5],[1292763600000, 3],[1293368400000, 1],[1293973200000, 3],[1294578000000, 26],[1295182800000, 2],[1295787600000, 0],[1296392400000, 5],[1296997200000, 47],[1297602000000, 36],[1298206800000, 12],[1298811600000, 21],[1299416400000, 0],[1300021200000, 0],[1300626000000, 16],[1301230800000, 0],[1301839200000, 3],[1302444000000, 4],[1303048800000, 2],[1303653600000, 0],[1304258400000, 1],[1304863200000, 5],[1305468000000, 2],[1306072800000, 1],[1306677600000, 4],[1307282400000, 1],[1307887200000, 1],[1308492000000, 51],[1309096800000, 77],[1309701600000, 3],[1310306400000, 2],[1310911200000, 1],[1311516000000, 10],[1312120800000, 4]             ],
                color: '#007396'
            };
        </script>
</head>
    <body>    
    </body>
</html>

EDIT: To clarify I would like to be able to get access to the myData structure in the above HTML example within objective C as a NSDictionary or similar.

NSInteger x = [[[[[myDataArray objectAtIndex:0] objectForKey:@"data"] objectAtIndex:0] objectAtIndex:0]

I have used http://stig.github.com/json-framework for converting JSON into NSDictionary but was wondering how I could combine this to access this javascript object from within the HTML

I believe this is a separate question but maybe I am missing the point here... I have edited the description to describe specifically what i would like to do. could you provide an example javascript for stringByEvaluatingJavaScriptFromString to pull in the myData object in the above example HTML. — joneswah
– joneswah, Commented Aug 17, 2011 at 2:59

Srikar Appalaraju · Accepted Answer · 2011-08-21 04:42:42Z

1

I think this is a duplicate post. But still let me clarify your doubt -

[webView stringByEvaluatingJavaScriptFromString:@"obj.func();"];

EDIT: Check this - How to inject Javascript in UIWebView

Hope this helps...

edited Aug 21, 2011 at 4:42

answered Aug 17, 2011 at 1:57

Srikar Appalaraju

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1 Comment

MJVDM Over a year ago

that calls a java fund from objective-C, but that doesn't get you data from the javascript code to objective-C, at least nothing except strings

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