Selenium打印元素的空innerHTML / innerText

Question

使用Selenium，为什么以下函数会打印空字符串？如果我尝试'innerText'而不是'innerHTML'，则相同。

send_keys部分工作正常。

def button_clicked(self):
        browser = webdriver.Firefox()
        browser.get('https://www.google.com')
        search_box = browser.find_element_by_xpath("//input[@title='Search']")
        search_box_HTML = search_box.get_attribute('innerHTML')
        print(search_box_HTML)

Answer 1

<input>没有内部内容文字或HTML。相反，用户输入的数据存储在value属性中，可以使用WebElement#get_attribute()检索该属性：

search_box.get_attribute(“value”)

Answer 2

您应该将代码更改为：

search_box.get_attribute('value')

应该做的伎俩

Answer 3

如果查看页面https://www.google.com的 HTML 并检查 搜索框 WebElement 您已确定为：

find_element_by_xpath("//input[@title='Search']")

WebElement 的定义如下：

<input class="gsfi" id="lst-ib" maxlength="2048" name="q" autocomplete="off" title="Search" type="text" value="" aria-label="Search" aria-haspopup="false" role="combobox" aria-autocomplete="list" dir="ltr" spellcheck="false" style="border: none; padding: 0px; margin: 0px; height: auto; width: 100%; background: url(&quot;data:image/gif;base64,R0lGODlhAQABAID/AMDAwAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw%3D%3D&quot;) transparent; position: absolute; z-index: 6; left: 0px; outline: none;">

的 get_attribute("innerHTML")

根据文档，Element.innerHTML获取描述元素后代的HTML语法，get_attribute()定义如下：

    def get_attribute(self, name):
    """Gets the given attribute or property of the element.

    This method will first try to return the value of a property with the
    given name. If a property with that name doesn't exist, it returns the
    value of the attribute with the same name. If there's no attribute with
    that name, ``None`` is returned.

    Values which are considered truthy, that is equals "true" or "false",
    are returned as booleans.  All other non-``None`` values are returned
    as strings.  For attributes or properties which do not exist, ``None``
    is returned.

    :Args:
        - name - Name of the attribute/property to retrieve.

    Example::

        # Check if the "active" CSS class is applied to an element.
        is_active = "active" in target_element.get_attribute("class")

    """

因此，由于 WebElement 即 搜索框 没有后代，所以 get_attribute('innerHTML') 返回为空