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How to pass an XCode variable to the HTML file in resources folder?

Answer 1

A:

You can construct a Javascript string then pass into -stringByEvaluatingJavaScriptFromString:, e.g.

NSInteger u = get_integer_from_user();
NSString* script = [NSString stringWithFormat:@"call_your_function(%d);", u];
[webView stringByEvaluatingJavaScriptFromString:script];

KennyTM 2010-01-30 09:20:39

KennyTM, I understood this. In my html file, I've a javascript in which there's function initialise(), which I'm calling on onload. i.e. <body onload="initialise()" onunload="GUnload()">. Now can I simply write it as initialise(number s) and procceed?

neha 2010-01-30 10:58:49

@neha: Yes. But in that case you need to remove the `initialize()` in your `onload` to avoid double-initialization.

KennyTM 2010-01-30 13:23:47

But, if I remove initialise() in onload(), the script doesnt find anything to execute on load and it doesn't work..

neha 2010-01-30 13:38:30

@neha: You need to make a delegate to your web view and pass the script in `-webViewDidStartLoad:`. Alternatively, you can construct your HTML with `-loadHTMLString:baseURL:`.

KennyTM 2010-01-30 13:41:11

Thanx for your help, KennyTM! It really helped.

neha 2010-01-30 14:02:11

KennyTM, I've started implementing this part. Here, you are directly providing the webView the function name. How will it get the path of the script along with script name?

neha 2010-02-03 10:55:14

@neha: Path of the script??? You control the HTML file and scripts don't you?

KennyTM 2010-02-03 12:28:09

Yes. I mean, the file is in my app's resources folder. So I need to specify the path till that file somewhere in my code like [[NSBundle mainBundle] pathForResource:@"java1" ofType:@"html"] where java1.html is my html file. If I want to provide this path then I'll have to use other method than stringByEvaluatingJavaScriptFromString:

neha 2010-02-03 12:57:09

@neha: But to invoke the a Javascript function you don't need to know the script's path. You just need to know the function's name. What am I missing?

KennyTM 2010-02-03 13:57:07

As per my knowledge, in xcode you need to specify the script path which I mentioned, in order it to know where the script lies. Basically, I'm trying to do what you proposed i.e. to remove the onload() function, and it's just eating me out... I want to pass parameters to my script. I've tried doing it a thousand ways since yesterday. Normally I'm able to run it fine without passing parameters.

neha 2010-02-03 14:16:06

Answer 2

A:

You can do something like

[_webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"Handler.method(%@);", variable]];

where Handler.method is a Javascript function. Make sure the page has loaded until you evaluate this Javascript, or it will not work. I use this method myself and it works, although I had to base64 encode the data to make it work. Depends on the value you store in it.

JoostK 2010-01-30 09:21:34

Thanx for your help, JoostK. It helped..

neha 2010-02-01 06:35:55

JoostK, here you are providing the webView the function name so where do u specify the script name and path?

neha 2010-02-03 11:37:44

In my case, the `Handler.method` is just a normal Javascript function. The `UIWebView` tries to handle this JS call and looks for this method, in any `script`-element or imported Javascript. So you can just import/define you JS in the HTML file you load in the `webView`, then you can call any Javascript function from Cocoa.

JoostK 2010-02-03 21:40:17

Is this true even if my javascript[which is embedded in html] is in resources folder and not written in xcode file? Because I generally provide this path while running.

neha 2010-02-04 06:11:28

HTML is not something Xcode needs to compile, so it's fine within the Resources. Resources are just copied over to your application bundle, without trying to compile it. So if your HTML loads as expected, your Javascript will have been loaded as well.

JoostK 2010-02-04 20:49:02

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How to pass an XCode variable to the HTML file in resources folder?

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