Capabilities & ChromeOptions example about thirtyfour

[stevepryde]

Hi, the Capabilities struct is really limited right now but you can easily extend it with raw JSON so it should be possible to add any capabilities as long as you know the format.

For Chrome options, I believe you can do things like this:

let mut caps = DesiredCapabilities::chrome();
caps.add("goog:chromeOptions", serde_json::json!({"args": ["--disable-web-security"]}));

I only tried with --headless and it seemed to work. Let me know if it works for you.

[stevepryde]

FYI - as of v0.6.0 (just deployed) you can now do:

let mut caps = DesiredCapabilities::chrome();
caps.add_arg("--disable-web-security")?;

The interface should actually be backwards compatible so people can still construct the capabilities struct manually if preferred.

[stevepryde]

As I understand it, generally you should not use blocking calls like thread::sleep() during async functions, since this will block that thread and potentially prevent other futures from running until you next .await.
If you're using tokio, have a look at https://docs.rs/tokio/0.2.11/tokio/time/fn.delay_for.html.

However, back in the world of website automation, it's also generally not ideal to use sleeps of any form to wait for things to happen on the website. Always prefer polling instead of sleeps where possible. This is because any code that uses sleeps is quite prone to timing issues and will either sometimes fail if the website was too fast/slow or otherwise your code might sleep unnecessarily long in places.

If the first click causes some element to appear or disappear, then you can effectively wait for that event to happen by repeatedly polling for that condition, and only fail after a certain number of tries (or after a certain amount of time). The thirtyfour crate is intended to be lower level than this and will stick fairly close to the selenium spec, but you can write high-level abstractions that take care of repeatedly calling find_element or checking whether an element has a particular attribute, until either the condition is met or a timeout is reached.

If you go down this path, sometimes it is better to set selenium's implicit wait timeout to 0 (via the WebDriver::implicitly_wait() method) so that you don't end up with two different timeouts interfering with each other. You might also still want to call tokio's delay method to delay 500ms or so between polling attempts. It really depends on what you're trying to do and the website you're interacting with.

However, the simplest way, at least when starting out, is to just search for the element you expect to appear, relying on selenium's implicit wait to sleep for you. Thirtyfour automatically sets the implicit wait to 30 seconds, but you can change it to whatever you need. You can also use CSS or XPath selectors to either wait for an element with specific attributes, or even wait for an existing element to gain specific attributes.

Hope that helps

[stevepryde]

I tried this in python and it doesn't work there either.
Try this instead:

driver.execute_script("window.open('about:blank', '_blank');", &ScriptArgs::new()).await?;
let tabs = driver.window_handles().await?;
driver.switch_to().window(&tabs[1]).await?;

You can also replace the about:blank with the url you want the new tab to navigate to.

[longjin1991]

It work, thank for your help.

[longjin1991]

Thank you,

• How to set delay time when click or input element.
  ex:
  elem1.click().await?;
  thread::sleep(time::Duration::from_secs(2)); //set delay time 2 second
  elem2.click().await?;

• How to open New tab?

• Add set time out to reload page?

[longjin1991]

thank for your help, Can you tell me how to open a new tab with thirtyfour same here:
https://www.testingexcellence.com/open-new-tab-browser-using-selenium-webdriver-java/

[stevepryde]

The code to open a new tab would be almost the same as the example you linked to.
Something like this (I have not tested it):

driver.find_element(By::Css("body")).await?.send_keys(Keys::Control + "t").await?;
let tabs = driver.window_handles().await?;
driver.switch_to().window(tabs[0]).await?;

You would need to check whether the new tab is the first element in the array.
Btw, feel free to browse the docs at https://docs.rs/thirtyfour. If anything is not clear in the docs I would be happy to update them.

[longjin1991]

I had test with your code but don't work, it don't open new tab:
driver.find_element(By::Css("body")).await?.send_keys(Keys::Control + "t").await?;

[stevepryde]

That will sent Ctrl+t to the body element. It's possible that doesn't work on the page you are on. It might be worth trying the same in python or Java and seeing if that works.

[longjin1991]

the code is worked, thank you.