Async commands to WebDriver in Selenium

Question

I am trying to handle the completion of asynchronous function in Selenium. Asynchronous js function must be started to execute after the click on the button.

Say listenFor(arguments[0]) listens for the end of the click handlers execution and it starts to listen it before the click action was dispatched. In the next function I am listening for click event before Click action using async/await of C#.

    private async void ExecuteJsAsync(IActionElement button)
    {
        Console.WriteLine("Started async function");

        var result = Task<bool>.Factory.StartNew(() =>
        {
            Console.WriteLine("Started to listen");

            var script = "listenFor(arguments[0])";
            var executor = (IJavaScriptExecutor)browser;

            return executor.ExecuteAsyncScript(script);
        });

        Console.WriteLine("Before click");
        new Actions(browser).Click(button).Perform();
        Console.WriteLine("After click");

        _result = await result;
    }

But I am getting the next sequence of logs:

1. Started async function    
2. Before Click
3. Started to listen

Here we can see that Click action has not been dispatched. And Question is:

Is it possible to execute several tasks asynchronously with Selenium (here Click action & listener)?
Why Selenium can't send Click action to the browser here?
Do Selenium commands like Click, SendKeys execute in the main javascripts thread?

Alexander · Accepted Answer · 2017-09-28 14:47:43Z

2

IMHO, if the logic is like that:

Asynchronous js function must be started to execute after the click on the button.

then you need to do something like a chain:

await Task.Run(() => { new Actions(browser).Click(button).Perform(); }).ContinueWith((_task) => { async code to execute AFTER Click (Perform method completion?) })

Sorry, not aware yet about intrinsic logic of Selenium, so not sure it's feasible.

answered Sep 28, 2017 at 14:47

Alexander

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