[Haskell-cafe] webdriver and click via executeJS

[John Lenz]

I have this problem all the time and it is pretty anoying. The problem is
in parsing the return value. The javascript is returning null but the
executeJS is returning `()`.  The aeson instance for `()` does not parse
null.  What I do is something like

someOper :: WD ()
    ret <- executeJS [...] "...]
    maybe (return ()) return ret -- parse value from executeJS as Maybe ()

On Fri, Dec 11, 2015 at 11:48 AM, Denis Shevchenko <haskell at dshevchenko.biz>
wrote:

> Hi there!
>
> I use `webdriver` package for test automation with PhantomJS. And I need
> to click some button, but not with a `click` function, but with a native
> JS. I see a special function for such a task, `executeJS`, in the module
> `Test.WebDriver.Commands`. So this is my code:
>
>     ...
>     button <- findElement . ById $ "clearCart"
>     info <- elemInfo button
>     executeJS [JSArg info] "arguments[0].click();"
>     ...
>
> But I got a runtime error:
>
> BadJSON "when expecting a (), encountered Null instead"
>
> How can I fix it?
>
> - Denis
>
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