What methods are available for page navigation in headless_chrome (Rust)?

In Rust, headless_chrome is a crate that provides a high-level API to control Chrome (or Chromium) in headless mode. This allows you to programmatically interact with web pages, including navigating through them. The crate essentially drives the browser through the DevTools Protocol.

Here are some methods available for page navigation using the headless_chrome crate:

1. Creating a Browser: Before you can navigate a page, you need to create an instance of a browser.

   use headless_chrome::{Browser, LaunchOptionsBuilder};
   
   let browser = Browser::new(
       LaunchOptionsBuilder::default()
           .headless(true)
           .build()
           .unwrap()
   )?;
   

2. Creating a Tab: Once you have a browser instance, you can create a new tab.

   let tab = browser.wait_for_initial_tab()?;
   

3. Navigating to a URL: To navigate to a new page, use the navigate_to method of the tab.

   tab.navigate_to("http://example.com")?;
   

4. Waiting for Navigation to Complete: After triggering navigation, you may want to wait until the page is loaded.

   tab.wait_until_navigated()?;
   

5. Clicking on Elements: To navigate by clicking on links or buttons on a page, first find the element and then click it.

   let selector = "a.some-link";
   let element = tab.wait_for_element(selector)?;
   element.click()?;
   

6. Forward and Backward Navigation: You can simulate the browser's forward and back buttons.

   tab.go_back()?;
   tab.go_forward()?;
   

7. Reloading the Page: To reload the current page.

   tab.reload()?;
   

Here's an example that combines these steps to navigate to a page and click a link:

use headless_chrome::{Browser, LaunchOptionsBuilder};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let browser = Browser::new(
        LaunchOptionsBuilder::default()
            .headless(true)
            .build()
            .unwrap()
    )?;

    let tab = browser.wait_for_initial_tab()?;
    tab.navigate_to("http://example.com")?;
    tab.wait_until_navigated()?;

    // Assuming there's a link with the class 'some-link'
    let selector = "a.some-link";
    let element = tab.wait_for_element(selector)?;
    element.click()?;
    tab.wait_until_navigated()?; // Wait for the click navigation to complete

    Ok(())
}

Please note that the headless_chrome crate may evolve, and it is important to check the latest documentation or source code for any updates or changes in the API. Also, error handling is essential when dealing with network operations and browser interactions; the above examples use ? to propagate errors, but in a production environment, you would likely want to handle these more gracefully.