Struct Selectors 

pub struct Selectors {
    inner: Weak<Selectors>,
}

Selectors can be used to install custom selector engines.

Fields

inner: Weak<Selectors>

Implementations

impl Selectors

pub(crate) fn new(inner: Weak<Impl>) -> Self

pub async fn register( &self, name: &str, script: &str, content_script: bool, ) -> Result<(), Arc<Error>>

An example of registering selector engine that queries elements based on a tag name:

const { selectors, firefox } = require('playwright');  // Or 'chromium' or 'webkit'.

(async () => {
 // Must be a function that evaluates to a selector engine instance.
 const createTagNameEngine = () => ({
   // Returns the first element matching given selector in the root's subtree.
   query(root, selector) {
     return root.querySelector(selector);
   },

   // Returns all elements matching given selector in the root's subtree.
   queryAll(root, selector) {
     return Array.from(root.querySelectorAll(selector));
   }
 });

 // Register the engine. Selectors will be prefixed with "tag=".
 await selectors.register('tag', createTagNameEngine);

 const browser = await firefox.launch();
 const page = await browser.newPage();
 await page.setContent(`<div><button>Click me</button></div>`);

 // Use the selector prefixed with its name.
 const button = await page.$('tag=button');
 // Combine it with other selector engines.
 await page.click('tag=div >> text="Click me"');
 // Can use it in any methods supporting selectors.
 const buttonCount = await page.$$eval('tag=button', buttons => buttons.length);

 await browser.close();
})();

Args

name

Name that is used in selectors as a prefix, e.g. {name: 'foo'} enables foo=myselectorbody selectors. May only contain [a-zA-Z0-9_] characters.

script

Script that evaluates to a selector engine instance.

content_script

Whether to run this selector engine in isolated JavaScript environment. This environment has access to the same DOM, but not any JavaScript objects from the frame’s scripts. Defaults to false. Note that running as a content script is not guaranteed when this engine is used together with other registered engines.

Trait Implementations

impl Clone for Selectors

fn clone(&self) -> Selectors

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Selectors

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.