Passing array of dictionary to javascript function from iOS

Question

My javascript function needs this type of array:

var data = [{
                                    "sale": "202",
                                    "year": "2000"
                                    }, {
                                    "sale": "215",
                                    "year": "2002"
                                    }, {
                                    "sale": "179",
                                    "year": "2004"
                                    }, {
                                    "sale": "199",
                                    "year": "2006"
                                    }, {
                                    "sale": "134",
                                    "year": "2008"
                                    }, {
                                    "sale": "176",
                                    "year": "2010"
                                    }];

I want to pass this array as an argument from [webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"js_func(%@, %@)", y1Arr, y2Arr]];

I am passing array of dictionary with this format:

({
    x = "663.78";
    y1 = "-0.000";
},
{
    x = "663.88";
    y1 = "0.005";
},
{
    x = "663.98";
    y1 = "0.019";
},
{
    x = "664.08";
    y1 = "-0.001";
}
)

But its not working...

There is no dictionary type in JavaScript. Use [] instead of () in your last snippet to make it an array. Oh and what is "not working"? — A1rPun
– A1rPun, Commented Feb 27, 2015 at 8:28
({ x = "663.78"; y1 = "-0.000"; }, { x = "663.88"; y1 = "0.005"; }, { x = "663.98"; y1 = "0.019"; }, { x = "664.08"; y1 = "-0.001"; } ), this is the log from debugger. My JS function is not getting called. I tried putting and alert there, but no luck. — devdoe
– devdoe, Commented Feb 27, 2015 at 8:38

Jerome Diaz · Accepted Answer · 2015-02-27 08:30:24Z

1

You shouldn't pass directly your arrays in the stringWithFormat, you should first convert them into json objects and then pass those json objects (as string representation) to the stringWithFormat

NSData *data1 = [NSJSONSerialization dataWithJSONObject:y1Arr options:0 error:NULL];
NSString *y1ArrStr = [[NSString alloc] initWithData:data1 encoding:NSUTF8StringEncoding];

NSData *data2 = [NSJSONSerialization dataWithJSONObject:y2Arr options:0 error:NULL];
NSString *y2ArrStr = [[NSString alloc] initWithData:data2 encoding:NSUTF8StringEncoding];

[webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"js_func(%@, %@)", y1ArrStr, y2ArrStr]];

answered Feb 27, 2015 at 8:30

Jerome Diaz

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2 Comments

devdoe Over a year ago

OK, function is working now.. but when I try ti alert(arrayData), it displays weird values like: [object Object], [object Object]

Jerome Diaz Over a year ago

For javascript things like { x = "663.78"; y1 = "-0.000"; } are objects, and it doesn't know how to render them inside an alert, try alert(arrayData[0].x)

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