Problem evaluating javascript source with QWebView

[A Former User]

Hi,

I could use some help solving the following problem. I keep getting an error with the following code:
// HtmlWizard.cpp
QString scriptSource = "if (Wizard_OnNext != null)
wizard.nextButtonClicked.connect(Wizard_OnNext);";
ui.webView->page()->mainFrame()->evaluateJavaScript(scriptSource);

Here I try to execute some javascriptcode with the function evaluateJavascript, it should never give an error. However when the javascript function Wizard_OnNext does not exist,
Qt shows an alert with the error:
"undefined:1: ReferenceError: Can't find variable: Wizard_OnNext"

This is incorrect, since the syntax is correct. Does anybody know how I can solve this problem?

Thanks in advance,

Jelko

[A Former User]

@Jelko Have you tried putting brackets around the connect line?

[A Former User]

I try to use standard javascript code to determine if a function exists, it seems
that the Qt engine which parses javascript does not recognize it as valid javascript code. Does somebody know a workaround?

Thanks in advance

[A Former User]

@raf924 I am not sure what you mean: I tried different combinations. Could you give an example?

[A Former User]

@Jelko

if (Wizard_OnNext != null) {
 wizard.nextButtonClicked.connect(Wizard_OnNext);
}

[A Former User]

It now works:

QString scriptSource = "if (typeof Wizard_OnNext == 'function') { wizard.nextButtonClicked.connect(Wizard_OnNext); }";
ui.webView->page()->mainFrame()->evaluateJavaScript(scriptSource);