Comments on: Search and highlight text in UIWebView

By: dRine

dRine — Wed, 08 Sep 2010 08:38:17 +0000

Thank you so much !
I’ve read it was something like that on the apple developer forum but the solutions were wrong. Instead, YOU are totally right !
Thanks for your quick answer !!

By: Alexander

Alexander — Wed, 08 Sep 2010 08:21:00 +0000

@dRine

Probably, Xcode does not treat the .js file as resource file. And so it tries to compile it instead of copying it into as resource into the app bundle.

To fix this, look into the sidebar of the project window in XCode and locate the section “targets”. Here you should move the .js file from “compile source” to “copy bundle resources” section.

By: dRine

dRine — Wed, 08 Sep 2010 07:53:13 +0000

Hi,
Very helpful post, thanks a lot !
Unfortunately, I’ve got a little problem with it. If I put some javascript directly in my Objective-C code, no problem. But now, I’ve put some more complex code in a .js file. The problem is that the mainBundle can’t find it. I’ve put my .js file in my Resources folder. I’ve also tried with a .txt. I really don’t understand.
Have you an idea of what the problem is ?
thanks a lot !

By: Alexander

Alexander — Fri, 13 Aug 2010 19:24:05 +0000

@Fabio
The delegate method “viewDidFinishLoad:” is the right place to inject your JavaScript code. But you have to use the “setDelegate:” method of the UIWebView object first to set the object which implements this “viewDidFinishLoad:” method. If you donÄ’t set the delegate, the delegate method is not called.
And you have to use the method “stringByEvaluatingJavaScriptFromString:” of UIWebView to execute JavaScript code. Here you can pass any Javascript code to the UIWebView.

By: Fabio

Fabio — Fri, 13 Aug 2010 19:10:35 +0000

Alexander, i thank you anticipately, but how i could manage the

[webView loadRequest:requestObj];

like in java(i come from it)

UiWebView view= webView.loadRequest(requestObj);
view.injectSomeJs(myjs);
view.show();

how it could be done(if it’s not so much complicated)
actually, i load my webView on
-(void)viewDidLoad{..}

i tried to put the code snippets you suggested on
- (void)viewDidFinishLoad:(UIWebView *)webView {…}

but the debug never reach this point any suggestion?

By: Alexander

Alexander — Fri, 13 Aug 2010 18:47:36 +0000

@Fabio
Yes, you can inject JavaScript code with new StyleSheets. But this can be only done after the page is loaded, so the page will load and display with the original stylesheets first before you can set the new stylesheets.

By: Fabio

Fabio — Fri, 13 Aug 2010 17:13:05 +0000

Hi Alexander

i had a problem, i need to load a custom css on a uiwebview

NSURL *url = [NSURL URLWithString:indirizzo];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[webView loadRequest:requestObj];

i must style the page via the css after i loaded it. You think it’s possible to inject javascript with my css rules, and finally show the webpage modified?
Thanks for your help!

By: Ryan

Ryan — Thu, 05 Aug 2010 18:31:57 +0000

It worked! I had to brush up on what is meant to call a delegate method, but after that it was pretty straight forward.

Thanks for your help Alexander!

By: Alexander

Alexander — Wed, 04 Aug 2010 20:35:17 +0000

@Ryan and others who have the same issue

Please make sure that you call “highlightAllOccurencesOfString:” after the page is completely loaded and rendered. If you call it too early, the HTML code is not yet rendered and so the script won’t be able to find anything. So at least you have to wait until the UIWebView delegate “webViewDidFinishLoad:” is called.

By: Alexander

Alexander — Tue, 03 Aug 2010 16:26:40 +0000

@Ryan
Could you create a simple text project where this issue can be seen and then send it to me or post a link to the project? The above code works in my projects, so I would need to check this myself in order to help.

By: Ryan

Ryan — Tue, 03 Aug 2010 15:37:18 +0000

Hi Alexander,

Thank you for putting this page together. I have a question though.

I am having the same problem as @Siddu. I cannot get the javascript to execute inside the “if (element.nodeType == 3)” statement. I would like to do a simple search for text in an html script that I created and displayed in the UIWebview. For example, I may display a string defined by the following html:

@”The Meaning of Life … really is 42!”

the search for the string “Life”

Any ideas on why MyApp_SearchResultCount shows up as 0? Thank you kindly.

-Ryan

By: Kalibannez

Kalibannez — Mon, 02 Aug 2010 23:37:11 +0000

Thank you, Alexander!
Great note!

By: physical therapist

physical therapist — Thu, 29 Jul 2010 22:46:57 +0000

this post is very usefull thx!

By: Aloha Silver

Aloha Silver — Wed, 21 Jul 2010 15:30:58 +0000

Alexander, using the semicolon works!

I just need to understand HTML nodes better before successfully implementing my idea now.

Thanks a lot!

By: Marie

Marie — Mon, 19 Jul 2010 19:55:22 +0000

Oh! never mind! it was a problem with the UIWebView…thanks! It works perfectly!