从 Python Selenium ZC6E190B284633C48E39E55049DA3CCE8 返回 javascript 数据

Question

I'm trying to run a javascript file inside a Python file using Selenium WebDriver and get the return value from the javascript function. 下面的尝试应该可以从我在网上查到的内容进行。 我已经为此工作了几个小时，但无济于事。 任何帮助，将不胜感激。

Python 代码：

from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
import os


driver = webdriver.Chrome(executable_path='chromedriver')
driver.get('example.com')

# Clean up the text inside the <p> tags
js_file = 'clean_text.js'
with open(js_file, 'r') as f:
    script = f.read()

# Attempt 1
text = driver.execute_script(script)

# Attempt 2
text = driver.execute_script(f'return {script}')

# Attempt 3
text = WebDriverWait(driver, 20).until(lambda driver: driver.execute_script(script))

# Attempt 4
text = WebDriverWait(driver, 20).until(lambda driver: driver.execute_script(f'return {script}'))

尝试返回 None 或 selenium.common.exceptions.TimeoutException

Javascript 代码：

$(document).ready(function() {
  // Collect the text within the nested <p> tags
  var text = [];

  // get all nested <p> tags
  let paragraphs = $(`div#id div[data-test-id=value] p`);

  // Replace all whitespaces with a single white space
  paragraphs.each(function(index) {
    let original_text = $(this).text();
    let cleaned_text = original_text.trim().replace(/\s\s+/g, ' ');
    $(this).text(cleaned_text);
    text.push(cleaned_text);
  });

  return text;
});

鉴于此 JS 代码下方的 furas 答案适用于尝试 1 和 4。我需要在开头添加“return”，“();” 最后并移除 jQuery。

return function cleanText() {
  // Collect the text within the nested <p> tags
  var text = [];

  // get all nested <p> tags
  let paragraphs = $(`div#id div[data-test-id=value] p`);

  // Replace all whitespaces with a single white space
  paragraphs.each(function(index) {
    let original_text = $(this).text();
    let cleaned_text = original_text.trim().replace(/\s\s+/g, ' ');
    $(this).text(cleaned_text);
    text.push(cleaned_text);
  });

  return text;
}();

Answer 1

所有问题都可能是因为您在ready()中运行function() ) 并且它return将text发送到ready() ，而不是发送给您。 您必须直接运行function才能获得结果。

from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
import os
import time

driver = webdriver.Chrome()# executable_path='chromedriver')
driver.get('http://quotes.toscrape.com/js/')

#script = '$(document).ready(function() { return "Hello World"; })';
script = 'function test() { return "Hello World"; })()';

time.sleep(3)

# Attempt 1
text = driver.execute_script(script)
print(text)  # None

# Attempt 2
text = driver.execute_script(f'return {script}')
print(text)  # Hello World

# Attempt 3
#text = WebDriverWait(driver, 20).until(lambda driver: driver.execute_script(script))
#print(text)  # error

# Attempt 4
text = WebDriverWait(driver, 20).until(lambda driver: driver.execute_script(f'return {script}'))
print(text)  # Hello World

---

编辑：

如果你真的需要检查文件是否准备好，那么你应该在你的 function 里面做。 您可以尝试使用带有变量$.isReady的while -loop

在 JQuery 中，如何检查 DOM 是否准备就绪？