ruby – 如何使用Watir :: Waiter :: wait_until强制Chrome等待？

我试图告诉我的watir脚本等待ajax注册登录框打开.我正在使用watir-webdriver,并在Chrome中进行测试.如下面(简化的)脚本所述,我无法让wait_until工作.

require "rubygems"
require "watir-webdriver"
b = Watir::browser.new(:chrome)
site = "www.example.com"
b.goto site

puts "Click on Sign In button"
b.link(:id,'btnLogin').click

puts "Waiting for the username/password dialog to show up"

# Below line does *not* work
# Throws this error: "uninitialized constant Watir::Waiter (NameError)" 
Watir::Waiter::wait_until { b.text_field(:id,'username').exists? }

# Below line does *not* work
# Throws this error: "undefined method `wait_until' for main:Object (NoMethodError)" 
wait_until { b.text_field(:id,'username').exists? }

# Below line *does* work,but I don't want to use it.
sleep 1 until b.text_field(:id,'username').exists?

Watir ::服务员是仅IE类吗？或者我做错了什么,睡眠1等待方法工作正常.我是Ruby和watir的新手,我字面上只是昨天拿起来,所以我一半期望这是我的无礼的结果.

如果是相关的,我正在使用mac(OSX v.10.6.5).

解决方法

先做这个：

require "watir-webdriver/wait"

然后尝试这些：

1

Watir::Wait.until { ... }

2

browser.text_field(:id => 'username').when_present.set("name")

3

browser.text_field(:id => 'username').wait_until_present

请注意,这里的“present”表示“元素既存在又可见”.