相关疑难解决方法(0)

我在谷歌和SO网站上搜索过,我得到了JAVA的答案,但似乎没有得到node.js的答案

我有一个需要时间加载的网络应用程序.我会selenium程序等到页面加载然后执行一些操作.

我目前的代码如下

//dependencies
var webdriver = require('selenium-webdriver'),
    util = require('util'),
    _ = require('underscore');

var driver = new webdriver.Builder().withCapabilities(webdriver.Capabilities.chrome()).build();
var branchName =  _.isUndefined(process.argv[3]) ? 'branch' : process.argv[3], 
    hostName = _.isUndefined(process.argv[2]) ? 'localhost' : process.argv[2],
    appTmpl = 'http://%s/%s',
    username = 'xxxx',
    password = 'xxxx';
var appUrl = util.format(appTmpl, hostName, branchName);

driver.get(appUrl);
driver.findElement(webdriver.By.name("username")).sendKeys(username);
driver.findElement(webdriver.By.name("password")).sendKeys(password);
driver.findElement(webdriver.By.name("login_button")).click();
driver.quit();

我得到的错误是:

    C:\Work\study\selenium\node_modules\selenium-webdriver\lib\webdriver\promise.js:1643
      throw error;
            ^
NoSuchElementError: no such element
  (Session info: chrome=37.0.2062.103)
  (Driver info: chromedriver=2.10.267521,platform=Windows NT 6.1 SP1 x86_64)
    at new bot.Error (C:\Work\study\selenium\node_modules\selenium-webdriver\lib\atoms\error.js:109:18)
    at Object.bot.response.checkResponse (C:\Work\study\selenium\node_modules\selenium-webdriver\lib\atoms\response.js:106:9) …

我正在尝试编写一个登录到网站的节点功能,并且无法使其正常工作.我试图等待页面加载使用该帖子中isElementPresent引用的函数,但它似乎没有工作.

这是我到目前为止所拥有的:

const webdriver = require('selenium-webdriver')
const By = webdriver.By

var username = ''
var password = ''
var timeout = 5000

function FacebookLogin(username, password) {

    var driver = new webdriver.Builder()
        .withCapabilities(webdriver.Capabilities.chrome())
        .build()

    driver.get('http://www.facebook.com')

    driver.wait(function() {
        return driver.isElementPresent(By.id('email'))
    }, timeout)

    var user = driver.findElement(By.id('email'))
    user.sendKeys(username)

    var pass = driver.findElement(By.id('pass'))
    pass.sendKeys(password)

    pass.submit()
    driver.sleep(5000)
    driver.quit()
}

FacebookLogin(username, password)

当我运行该功能虽然我收到错误TypeError: driver.isElementPresent is not a function.这里发生了什么,我错过了什么？