Cocoa WebView: Cannot call Specific Javascript method using `callWebScriptMethod:`

Question

I am loading a page into a WebView. The page has this little-test Javascript:

<script type="text/javascript">
function test(parametr)
{

  $('#testspan').html(parametr);

}

var bdu = (function(){
 return {
  secondtest: function(parametr) {

  $('#testspan').html(parametr);

  }
 }
})();
</script>

The problem is that I can't call the "secondtest" function from cocoa

this is perfectly work:

[[webview1 windowScriptObject] callWebScriptMethod:@"test" withArguments:arguments];

and this is not working:

[[webview1 windowScriptObject] callWebScriptMethod:@"bdu.secondtest" withArguments:arguments];

What would cause this problem and how do I fix it?

Thanks

I'll post this as comment instead of an answer: I don't know much about Javascript but it looks like the secondTest function is imbedded inside a block which itself is inside a function call. I don't see how anything external to script can resolve it as a callable function. (If this does work in Javascript, that language is an even bigger train wreck than I thought.) I would remove the function from its embedding and see if it works. If it does, then the embedding is wrong. — TechZen
– TechZen, Commented Feb 25, 2010 at 13:39

worriorbg · Accepted Answer · 2013-07-18 08:58:19Z

2

I was struggling with this for some time in Cordova MacOSX and here is the solution I found and works for me:

JavaScript:

CordovaBridgeUtil.isObject = function(obj) { return obj.constructor == Object; };

ObjectiveC:

WebScriptObject* bridgeUtil = [win evaluateWebScript:@"CordovaBridgeUtil"];
NSNumber* result = [bridgeUtil callWebScriptMethod:@"isObject" withArguments:[NSArray arrayWithObject:item]];

answered Jul 18, 2013 at 8:58

worriorbg

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Comments

Krisztián Balla · Accepted Answer · 2015-11-30 11:22:33Z

1

"callWebScriptMethod" is meant to call a given method on a given webscript (i.e. javascript) object. On your second line you want to call the "secondTest" method on the javascript object named "bdu". The way to do this is to:

Get the bdu object from your window object:

WebScriptObject* bdu =[[webview1 windowScriptObject] valueForKey:@"bdu"];
Call the "secondTest" method on the bdu object:

[bdu callWebScriptMethod:@"secondtest" withArguments:arguments];

edited Nov 30, 2015 at 11:22

Krisztián Balla

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answered Aug 31, 2012 at 23:20

Olivier Bonal

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Comments

Yuji · Accepted Answer · 2010-02-26 18:40:49Z

0

callWebscriptMethod:(NSString*)name withArguments:(NSArray*)args:

does not evaluate name as a Javascript expression. So it can't parse bdu.secondtest: it doesn't look up bdu first, then get the entry secondtest in it.

Instead, just use evaluateWebScript:.

answered Feb 26, 2010 at 18:40

Yuji

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