键入错误.css(标记名称)

Question

我似乎无法弄清楚是什么导致了typeError或为什么。基本上，我所要做的就是获取当前选定帧的名称。下面是代码和错误。

this.getCurrentFrameName = function(driver)
{
    var frames = driver.findElements(driver.By.css('frame'));
    for (var frame in frames)
    {
        if (frame.isSelected()) {
            return frame.getName;
        }
    }
};

错误

TypeError: Cannot read property 'css' of undefined
at getCurrentFrameName (C:Userscharles.sextonWebstormProjectsJS-Selenium-ToolkitsrcFrameHandler.js:21:75)
at Context.<anonymous> (C:Userscharles.sextonWebstormProjectsJS-Selenium-ToolkittestFrameHandlerTest.js:17:29)
at callFn (C:Userscharles.sextonWebstormProjectsJS-Selenium-Toolkitnode_modulesmochalibrunnable.js:315:21)
at Test.Runnable.run (C:Userscharles.sextonWebstormProjectsJS-Selenium-Toolkitnode_modulesmochalibrunnable.js:308:7)
at Runner.runTest (C:Userscharles.sextonWebstormProjectsJS-Selenium-Toolkitnode_modulesmochalibrunner.js:422:10)
at C:Userscharles.sextonWebstormProjectsJS-Selenium-Toolkitnode_modulesmochalibrunner.js:533:12
at next (C:Userscharles.sextonWebstormProjectsJS-Selenium-Toolkitnode_modulesmochalibrunner.js:342:14)
at C:Userscharles.sextonWebstormProjectsJS-Selenium-Toolkitnode_modulesmochalibrunner.js:352:7
at next (C:Userscharles.sextonWebstormProjectsJS-Selenium-Toolkitnode_modulesmochalibrunner.js:284:14)
at Immediate._onImmediate (C:Userscharles.sextonWebstormProjectsJS-Selenium-Toolkitnode_modulesmochalibrunner.js:320:5)

编辑：我想将所有内容包含在测试中，但仍然遇到与以前相同的错误。我没有包括期望、断言或应该声明。

var expect = require('chai').expect;
var FrameHandler = require('../../JS-Selenium-Toolkit/src/FrameHandler.js');
var webdriver = require('selenium-webdriver');
/** required imports for Google Chrome without setting the PATH environment variable */
var chrome = require('selenium-webdriver/chrome');
var chromePath = require('selenium-chromedriver').path;
describe('FrameHandler', function()
{
var frameHandler = new FrameHandler();
it('', function()
{
    var service = new chrome.ServiceBuilder(chromePath).build();
    chrome.setDefaultService(service);
    var driver = new webdriver.Builder()
        .withCapabilities(webdriver.Capabilities.chrome())
        .build();
    driver.get('http://google.com');
    var frames = driver.findElements(driver.By.css('frame'));
    console.log(frames.length());
    for (var frame in frames)
    {
        console.log(frame.getName);
        if (frame.isSelected()) {
            console.log(frame.getName);
            return frame.getName;
        }
    }
});

}）;

Answer 1

正如

@amitbobade刚刚观察到的，By不是构造的构建器对象的属性driver，而是Selenium-webdriver API实例webdriver的属性。

（对于任何 Java 读者来说，这相当于尝试在 WebDriver 实例而不是 WebDriver 类上调用 By.css()。

所以使用webdriver.By，而不是driver.By。

您可以使用console.log看到差异。如果在 webdriver 上执行此操作，则可以看到以下内容：

webdriver =  { ActionSequence: [Function: ActionSequence],
  Browser: 
   { ANDROID: 'android',
     CHROME: 'chrome',
     [...]
     HTMLUNIT: 'htmlunit' },
  Builder: [Function: Builder],
  Button: { LEFT: 0, MIDDLE: 1, RIGHT: 2 },
  By: 
   [Function: name(name) {
       return By.css('*[name="' + escapeCss(name) + '"]');
     }],
  Capabilities: [Function: Capabilities],
  Capability: 
   { ACCEPT_SSL_CERTS: 'acceptSslCerts',
   [...]