我遇到一个问题，让when_present实际等到元素出现在某些情况下。问题只是间歇性地发生，但在更改页面时总是会发生。
示例：我想在当前页面上单击“保存”，然后在后续页面的字段中输入文本。
如果我这样做：
$browser.button(:value => "Save").click
sleep 3
$browser.text_field(:label => "Name").when_present.set "Leelluu"
运行正常。
但是，如果我这样做：
$browser.button(:value => "Save").click
$browser.text_field(:label => "Name").when_present.set "Leelluu"
单击“保存”后，它会立即超时/崩溃。
我该如何解决这个问题？
（我知道，似乎我已经通过使用睡眠修复了它，但是我的老板告诉我，睡眠浪费时间。他说我需要从代码中删除所有这些并找到另一种方式。）
使用真实示例进行更新.....我输入搜索文本，然后单击搜索按钮，然后选择返回列表中前导复选框旁边的复选框。
$browser.text_field(:id => /.*search*./).set "Snow Leopard"
$browser.button(:id => "save_filter_PricebookEntry").when_present.click
$browser.checkbox(:id => "allBox").when_present.set
我得到一个“元素不可点击”（即使它有一个when_present）。
unknown error: Element is not clickable at point (251, 482). Other element would receive the click:
...
(Session info: chrome=31.0.1650.57) (Driver info: chromedriver=2.2,platform=Windows NT 6.1 SP1 x86_64)
["D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/remote/response.rb:51:in `assert_ok'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/remote/response.rb:15:in `initialize'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/remote/http/common.rb:59:in `new'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/remote/http/common.rb:59:in `create_response'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/remote/http/default.rb:66:in `request'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/remote/http/common.rb:40:in `call'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/remote/bridge.rb:634:in `raw_execute'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/remote/bridge.rb:612:in `execute'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/remote/bridge.rb:369:in `clickElement'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/common/element.rb:54:in `click'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-webdriver-0.6.4/lib/watir-webdriver/elements/checkbox.rb:26:in `set'", "D:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-webdriver-0.6.4/lib/watir-webdriver/wait.rb:100:in `method_missing'", "D:/Desktop/jardine/utils.rb:143:in `addQLIs'", "D:/Desktop/jardine/noSleepTest.rb:31:in `block in '", "D:/Desktop/jardine/framework.rb:39:in `execute'", "D:/Desktop/jardine/framework.rb:61:in `block in runTestCases'", "D:/Desktop/jardine/framework.rb:60:in `each'", "D:/Desktop/jardine/framework.rb:60:in `runTestCases'", "jardine.rb:66:in `
'"]