CEF Forum

Posted: **Mon Apr 27, 2015 3:09 am**

Hello!

I wrote js extension code and registered with CefRegisterExtension.
js code like this.

Code: Select all: var scriptRemover; if (!scriptRemover) scriptRemover = {}; (function() { scriptRemover.do = function() { var scripts = document.getElementsByTagName('script'); if (!scripts) return; for (var k = scripts.length - 1; k >= 0; k--) { var item = scripts[k]; item.parentNode.removeChild(item); } return true; }; })(); CefRegisterExtension("v8/scriptremover", code, NULL);

And run extension code in OnContextCreated callback like this.

Code: Select all: frame->ExecuteJavaScript(CefString("scriptRemover.do();"), "", 0);

After I build application and run it, I found that all scripts excuted despite of my extension code.
How can I remove <script> tags before they excuted?

Posted: **Wed Apr 29, 2015 1:21 pm**

What OS and CEF version? Where are you calling CefRegisterExtension from?

Posted: **Mon May 04, 2015 12:17 am**

I use Centos 7 and CEF3 build 2171.
And the CefRegisterExtension function call located at OnWebKitInitialized callback.

Posted: **Mon May 04, 2015 11:56 am**

Try passing the frame URL to the ExecuteJavaScript call.

Posted: **Wed May 06, 2015 12:47 am**

Code: Select all: frame->ExecuteJavaScript(CefString("scriptRemover.do();"), frame->GetURL(), 0);

This code not helps.

Below is my test routine.
1. Create test html document

Code: Select all: <html> <head> <script> console.log("HEAD"); </script> </head> <body> <script> console.log("BODY"); </script> </body> </html>

2. Run CEF Application
3. RegisterExtension
4. Load html document
5. Run Extension code at OnContextCreated
6. If extension works successfully, cef console should not print "HEAD". But it shouldn't.

Is there any fault in my idea?

Posted: **Wed May 06, 2015 9:18 am**

The DOM has not been loaded at the time that OnContextCreated is called, which is likely why your code doesn't work. The document element creation event proposed in https://bitbucket.org/chromiumembedded/cef/issue/1454 might work for your use case. It has not yet been implemented.

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