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Adding Javascript processing capability to TWebBrowser in iOS

Discussion in 'Delphi Android And IOS' started by N0body, Dec 2, 2013.

  1. N0body
    Online

    N0bodyN0body is a Verified Member DelphiFan Administrator Staff Member DF Staff

    In a post on the Embarcadero forums some time ago, Charles Vinal asked about whether it would be possible to have TWebBrowser implement the stringByEvaluatingJavaScriptFromString method which is available in UIWebView, which is inherited from its ancestor, UIView.
    The short answer is yes, however it requires some modifications to existing source. You need to make copies of FMX.WebBrowser and FMX.WebBrowser.iOS, and put them in the compiler search path. Next, make the following changes – in FMX.WebBrowser, add this to ICustomBrowser:


    Code:
    function GetJavaScriptResult(const ScriptName: string): string;

    Next, add this to TCustomWebBrowser:


    Code:
    function TCustomWebBrowser.GetJavaScriptResult(const ScriptName: string): string;
    begin
      if Assigned(FWeb) then
        Result := FWeb.GetJavaScriptResult(ScriptName);
    end;

    (make sure you add the function declaration to the class, too). Next, in FMX.WebBrowser.iOS, add this to TiOSWebBrowserService:


    Code:
    function TiOSWebBrowserService.GetJavaScriptResult(const ScriptName: string): string;
    begin
      if Assigned(FWebView) and FWebView.canGoForward then
        Result := FWebView.stringByEvaluatingJavaScriptFromString(NSSTR(ScriptName)).UTF8String;
    end;


    Note: If your project uses a TTabControl component, you’ll also need to make sure that the source file FMX.TabControl.pas is in your project path.




    Now in your project you’ll be able to call the function like this:


    Code:
    var
      JSResult: string;
    begin
      JSResult := WebBrowser1.GetJavaScriptResult('SomeScript');
    end;
     
  2. gamal97
    Offline

    gamal97 Guest

    it's a greate help !
     

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