puppeteer/assets/js/3df9cb2c.d3873c7c.js

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With additional precondition checks, it\nenables automatic retries for failed actions, resulting in more reliable and\nless flaky automation scripts."),(0,a.kt)("admonition",r({},{type:"note"}),(0,a.kt)("p",{parentName:"admonition"},"Locators API is experimental and we will not follow semver for breaking changes\nin the Locators API.")),(0,a.kt)("h2",r({},{id:"use-cases"}),"Use cases"),(0,a.kt)("h3",r({},{id:"waiting-for-an-element"}),"Waiting for an element"),(0,a.kt)("pre",null,(0,a.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"await page.locator('button').wait();\n")),(0,a.kt)("p",null,"The following preconditions are automatically checked:"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},"Waits for the element to become\n",(0,a.kt)("a",r({parentName:"li"},{href:"https://pptr.dev/api/puppeteer.elementhandle.isvisible/"}),"visible")," or hidden.")),(0,a.kt)("h3",r({},{id:"waiting-for-a-function"}),"Waiting for a function"),(0,a.kt)("pre",null,(0,a.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"await page\n  .locator(() => {\n    let resolve!: (node: HTMLCanvasElement) => void;\n    const promise = new Promise(res => {\n      return (resolve = res);\n    });\n    const observer = new MutationObserver(records => {\n      for (const record of records) {\n        if (record.target instanceof HTMLCanvasElement) {\n          resolve(record.target);\n        }\n      }\n    });\n    observer.observe(document);\n    return promise;\n  })\n  .wait();\n")),(0,a.kt)("h3",r({},{id:"clicking-an-element"}),"Clicking an element"),(0,a.kt)("pre",null,(0,a.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"await page.locator('button').click();\n")),(0,a.kt)("p",null,"The following preconditions are automatically checked:"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},"Ensures the element is in the viewport."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to 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hidden."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to become enabled."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to have a stable bounding box over two consecutive\nanimation frames.")),(0,a.kt)("h3",r({},{id:"filling-out-an-input"}),"Filling out an input"),(0,a.kt)("pre",null,(0,a.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"await page.locator('input').fill('value');\n")),(0,a.kt)("p",null,"Automatically detects the input type and choose an approritate way to fill it out with the provided value."),(0,a.kt)("p",null,"The following preconditions are automatically checked:"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},"Ensures the element is in the viewport."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to become\n",(0,a.kt)("a",r({parentName:"li"},{href:"https://pptr.dev/api/puppeteer.elementhandle.isvisible/"}),"visible")," or hidden."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to become enabled."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to have a stable bounding box over two consecutive\nanimation frames.")),(0,a.kt)("h3",r({},{id:"retrieving-an-element-property"}),"Retrieving an element property"),(0,a.kt)("pre",null,(0,a.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"const enabled = await page\n  .locator('button')\n  .map(button => !button.disabled)\n  .wait();\n")),(0,a.kt)("h3",r({},{id:"hover-over-an-element"}),"Hover over an element"),(0,a.kt)("pre",null,(0,a.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"await page.locator('div').hover();\n")),(0,a.kt)("p",null,"The following preconditions are automatically checked:"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},"Ensures the element is in the viewport."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to become\n",(0,a.kt)("a",r({parentName:"li"},{href:"https://pptr.dev/api/puppeteer.elementhandle.isvisible/"}),"visible")," or hidden."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to have a stable bounding box over two consecutive\nanimation frames.")),(0,a.kt)("h3",r({},{id:"scroll-an-element"}),"Scroll an element"),(0,a.kt)("pre",null,(0,a.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"await page.locator('div').scroll({\n  scrollLeft: 10,\n  scrollTop: 20,\n});\n")),(0,a.kt)("p",null,"The following preconditions are automatically checked:"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},"Ensures the element is in the viewport."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to become\n",(0,a.kt)("a",r({parentName:"li"},{href:"https://pptr.dev/api/puppeteer.elementhandle.isvisible/"}),"visible")," or hidden."),(0,a.kt)("li",{parentName:"ul"},"Waits for the element to have a stable bounding box over two consecutive\nanimation frames.")),(0,a.kt)("h2",r({},{id:"configuring-locators"}),"Configuring locators"),(0,a.kt)("p",null,"Locators can be configured to tune configure the preconditions and other other options:"),(0,a.kt)("pre",null,(0,a.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"await page\n  .locator('button')\n  .setEnsureElementIsInTheViewport(false)\n  .setTimeout(0)\n  .setVisibility(null)\n  .setWaitForEnabled(false)\n  .setWaitForStableBoundingBox(false)\n  .click();\n")),(0,a.kt)("h2",r({},{id:"getting-locator-events"}),"Getting locator events"),(0,a.kt)("p",null,"Currently, locators support a single event that notifies you when the locator is about to perform the action:"),(0,a.kt)("pre",null,(0,a.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"let willClick = false;\nawait page\n  .locator('button')\n  .on(LocatorEmittedEvents.Action, () => {\n    willClick = true;\n  })\n  .click();\n")),(0,a.kt)("p",null,"This event can be used for logging/debugging or other purposes. The event might\nfire multiple times if the locator retries the action."))}m.isMDXComponent=!0}}]);