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I'm trying to get the result from an existing Javascript function on a local html page, by using CefSharp in a Windows Form application.
The html page source is:
<!DOCTYPE html>
<html>
<body>
<p id="demo">A Paragraph.</p>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = true;
return 1 + 1;
}
</script>
</body>
</html>
My C# code is:
private void ChromeBrowser_LoadingStateChanged(object sender, LoadingStateChangedEventArgs args)
{
if (!args.IsLoading)
{
string result = RunScriptParamAsync("myFunction").ToString();
}
}
public string RunScriptParamAsync(string scriptName)
{
string script = "";
script = scriptName;
//script = string.Format("(function myFunction() {{ document.getElementById('demo').innerHTML = \"{0}\"; return 1 + 1; }})();", scriptName);
chromeBrowser.EvaluateScriptAsync(script).ContinueWith(x =>
{
var response = x.Result;
if (response.Success && response.Result != null)
{
dynamic result = response.Result;
return ((int)result).ToString();
}
else
{
return string.Empty;
}
});
return string.Empty;
}
If I use the commented line
//script = string.Format("(function myFunction() {{ document.getElementById('demo').innerHTML = \"{0}\"; return 1 + 1; }})();", scriptName);
then I'm getting the correct result (2), but the idea is to use a Javascript function already existing on a web page.
A breakpoint inside the function reveals this:
I've also tried
chromeBrowser.GetMainFrame().EvaluateScriptAsync(script)
but with same results.
Any ideas?
897
You are getting exactly what you are asking for, a reference to the function.You need to append (); to actually execute the function.
//Will return a IJavascriptCallback, which is effectively a function pointer, which is what you have asked for
await browser.EvaluateScriptAsync("myFunction");
//To execute the function you must append ();
await browser.EvaluateScriptAsync("myFunction();")
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