在for循环python中集成时，由actionchains send_keys发送的重复文本 [英] duplicated text sent by actionchains send_keys when integrating in for loop python

问题描述

我尝试将send_keys发送到textarea，所以我使用动作链发送密钥. 我使用了以下代码:

I try to send_keys to textarea so I use actionchains to send keys. I used this code:

url='https://translate.google.com/?hl=vi'
browserdriver.get(url)
list_test=['product description 1','product description 2']
for i in range (0,2):   
    try:
        body_text=list_test[i]
        browserdriver.execute_script("window.scrollTo(0, document.body.scrollHeight)")      
        item = WebDriverWait(browserdriver, 10).until(EC.presence_of_element_located((By.TAG_NAME, "textarea")))        
        actions.move_to_element(item).send_keys(body_text).perform()
        actions.reset_actions()
        time.sleep(1)
    except:
        pass
print("done")

然后将文本结果发送到Google翻译，如下所示:

And the result of text was sent to Google Translate as below:

product description 1product description 1product description 2

您会发现它是如此奇怪，就像这样:

You can see that is so weird that it should be like this:

product description 1product description 2

我还在动作链的源代码中将print()插入到utils.py中，以了解向send_keys函数发送了什么键入文本:

I also inserted print() to utils.py in source code of actionchains in order to know what typing text is sent to send_keys function:

def keys_to_typing(value):
    """Processes the values that will be typed in the element."""
    typing = []
    for val in value:
        if isinstance(val, Keys):
            typing.append(val)
        elif isinstance(val, int):
            val = str(val)
            for i in range(len(val)):
                typing.append(val[i])
        else:
            for i in range(len(val)):
                typing.append(val[i])    
    print(typing)#this is a code line that I inserted
    return typing

，keys_to_typing的输出控制台为:

and the output console of keys_to_typing is:

['p', 'r', 'o', 'd', 'u', 'c', 't', ' ', 'd', 'e', 's', 'c', 'r', 'i', 'p', 't', 'i', 'o', 'n', ' ', '1']
['p', 'r', 'o', 'd', 'u', 'c', 't', ' ', 'd', 'e', 's', 'c', 'r', 'i', 'p', 't', 'i', 'o', 'n', ' ', '1']

['p', 'r', 'o', 'd', 'u', 'c', 't', ' ', 'd', 'e', 's', 'c', 'r', 'i', 'p', 't', 'i', 'o', 'n', ' ', '2']
['p', 'r', 'o', 'd', 'u', 'c', 't', ' ', 'd', 'e', 's', 'c', 'r', 'i', 'p', 't', 'i', 'o', 'n', ' ', '2']

这是动作链源代码中的send_keys函数:

And this is the send_keys function in actionchains sourcecode:

def send_keys(self, keys_to_send):
        """
        Sends keys to current focused element.

        :Args:
         - keys_to_send: The keys to send.  Modifier keys constants can be found in the
           'Keys' class.
        """
        typing = keys_to_typing(keys_to_send)
        if self._driver.w3c:
            for key in typing:
                self.key_down(key)
                self.key_up(key)
        else:
            self._actions.append(lambda: self._driver.execute(
                Command.SEND_KEYS_TO_ACTIVE_ELEMENT, {'value': typing}))
        return self

请帮我解释一下这种奇怪的情况吗? 我不知道为什么在循环中，actionchains.send_keys发送重复的内容? 谢谢！

Pls help me to explain this weird situation? I do not know why in loop for, actionchains.send_keys send duplicated content? thanks!

推荐答案

问题是reset_actions()不能按预期工作(添加perform()不能解决问题). send_keys()中的self.key_down(key)和self.key_up(key)存储要在self.w3c_actions.key_action

The problem is reset_actions() doesn't work as expected (adding perform() doesn't solve the problem). self.key_down(key) and self.key_up(key) in send_keys() stores the characters to type in self.w3c_actions.key_action

def key_down(self, value, element=None):
    if element:
        self.click(element)
    if self._driver.w3c:
        self.w3c_actions.key_action.key_down(value)
        self.w3c_actions.pointer_action.pause()
    else:
        self._actions.append(lambda: self._driver.execute(
            Command.SEND_KEYS_TO_ACTIVE_ELEMENT,
            {"value": keys_to_typing(value)}))
    return self

调用reset_actions()时应清除这些动作

def reset_actions(self):
    """
        Clears actions that are already stored locally and on the remote end
    """
    if self._driver.w3c:
        self.w3c_actions.clear_actions()
    self._actions = []

但是他们没有.

用产品描述2 调用send_keys()时，文本将添加到key_action，该文本已经包含了从第一个for迭代，因此它会打印产品描述1产品描述2 .

When send_keys() is called with product description 2 the text is added to key_action, which already contains the actions for typing product description 1 from the first for iteration, so it prints product description 1product description 2.

可能的解决方案是在循环内创建ActionChains实例

Possible solution is to create ActionChains instance inside the loop

for i in range(0, 2):
    try:
        body_text = list_test[i]
        driver.execute_script("window.scrollTo(0, document.body.scrollHeight)")
        item = WebDriverWait(driver, 10).until(ec.presence_of_element_located((By.TAG_NAME, "textarea")))
        actions = ActionChains(driver)
        actions.move_to_element(item).send_keys(body_text).perform()
        time.sleep(1)
    except:
        pass

更新

我在 bugs.chromium 中打开了一个问题.该问题已转载，但不会得到解决(在可预见的将来至少).

I opened an issue in bugs.chromium. The issue was reproduced, but won't be fixed (in the foreseeable future atleast).

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