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from __future__ import annotations
from typing import Optional, Type
from langchain_core.pydantic_v1 import BaseModel, Field
from langchain.callbacks.manager import (
AsyncCallbackManagerForToolRun,
CallbackManagerForToolRun,
)
from langchain.tools.playwright.base import BaseBrowserTool
from langchain.tools.playwright.utils import (
aget_current_page,
get_current_page,
)
class ClickToolInput(BaseModel):
"""Input for ClickTool."""
selector: str = Field(..., description="CSS selector for the element to click")
class ClickTool(BaseBrowserTool):
"""Tool for clicking on an element with the given CSS selector."""
name: str = "click_element"
description: str = "Click on an element with the given CSS selector"
args_schema: Type[BaseModel] = ClickToolInput
visible_only: bool = True
"""Whether to consider only visible elements."""
playwright_strict: bool = False
"""Whether to employ Playwright's strict mode when clicking on elements."""
playwright_timeout: float = 1_000
"""Timeout (in ms) for Playwright to wait for element to be ready."""
def _selector_effective(self, selector: str) -> str:
if not self.visible_only:
return selector
return f"{selector} >> visible=1"
def _run(
self,
selector: str,
run_manager: Optional[CallbackManagerForToolRun] = None,
) -> str:
"""Use the tool."""
if self.sync_browser is None:
raise ValueError(f"Synchronous browser not provided to {self.name}")
page = get_current_page(self.sync_browser)
# Navigate to the desired webpage before using this tool
selector_effective = self._selector_effective(selector=selector)
from playwright.sync_api import TimeoutError as PlaywrightTimeoutError
try:
page.click(
selector_effective,
strict=self.playwright_strict,
timeout=self.playwright_timeout,
)
except PlaywrightTimeoutError:
return f"Unable to click on element '{selector}'"
return f"Clicked element '{selector}'"
async def _arun(
self,
selector: str,
run_manager: Optional[AsyncCallbackManagerForToolRun] = None,
) -> str:
"""Use the tool."""
if self.async_browser is None:
raise ValueError(f"Asynchronous browser not provided to {self.name}")
page = await aget_current_page(self.async_browser)
# Navigate to the desired webpage before using this tool
selector_effective = self._selector_effective(selector=selector)
from playwright.async_api import TimeoutError as PlaywrightTimeoutError
try:
await page.click(
selector_effective,
strict=self.playwright_strict,
timeout=self.playwright_timeout,
)
except PlaywrightTimeoutError:
return f"Unable to click on element '{selector}'"
return f"Clicked element '{selector}'"
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