由于存在过时异常的问题,GhostDriver 正在冒泡某些内容在上次执行后发生了更改。
在这个 { Random “Element is no longer attach to the DOM” StaleElementReferenceException } 问题上,有超过 16k 的视图,有人在讲述竞争条件和测试时发生的变化,但我的代码执行速度如此之快,以至于我无法相信发生了变化.
我什么都没改变,所有代码执行速度都很快,也许页面本身在测试片段执行的小时间范围内发生了变化。
没问题并且myLibWorks.findElements(..
返回元素,它使用FluentWait<SearchContext>
然后方法返回时元素可用。
它抛出:
缓存中不存在元素
当我尝试在元素上执行 javascript 之后。
这是我的 Java 代码的简化片段:
by = getBy_A001();
List<WebElement> welCollecN1 = myLibWorks.findElements(driver, timeOutInSeconds, pollingForSecond, by);
if (welCollecN1 != null) {
WebElement wel01 = welCollecN1.iterator().next();
if(wel01 != null)
{
by = getBy_A002();
List<WebElement> welCollecN2 = myLibWorks.findElements(wel01, timeOutInSeconds, pollingForSecond, by);
if (welCollecN2 != null) {
WebElement wel02 = welCollecN2.iterator().next();
if(wel02 != null)
{
String value = null;
value = elm.getText();
if(value.length() == 0) {
//-------------------------------------------------
// REACH here then i think its ok above, this works almost of time too
// THIS line throws "Element does not exist in cache"
value = (String) ((JavascriptExecutor) driver).executeScript(driver, "return arguments[0].innerHTML", wel02); // <<== ERROR
//-------------------------------------------------
}
}
}
}
}
Request => {"headers":{"Accept":"application/json, image/png","Connection":"Keep-Alive","Content-Length":"84" 导致缓存中不存在元素,"Content-Type":"application/json; charset=utf-8","Host":"127.0.0.1:4444"},"httpVersion":"1.1","method":"POST","post ":"{\"args\":[{\"ELEMENT\":\":wdc:1371656598440\"}],\"script\":\"返回参数[0].innerHTML\"}"," url":"/execute","urlParsed":{"anchor":"","query":"","file":"execute","directory":"/","path":"/execute “,“相对的”:”/execute","port":"","host":"","password":"","user":"","userInfo":"","authority":"","protocol": "","source":"/execute","queryKey":{},"chunks":["execute"]},"urlOriginal":"/session/efc7cf60-d8f6-11e2-9f07-192e7e451712/execute"命令持续时间或超时:736 毫秒有关此错误的文档,请访问:chunks":["execute"]},"urlOriginal":"/session/efc7cf60-d8f6-11e2-9f07-192e7e451712/execute"} 命令持续时间或超时:736 毫秒有关此错误的文档,请访问:chunks":["execute"]},"urlOriginal":"/session/efc7cf60-d8f6-11e2-9f07-192e7e451712/execute"} 命令持续时间或超时:736 毫秒有关此错误的文档,请访问: http://seleniumhq.org/exceptions/stale_element_reference.html构建信息:版本:'2.32.0',修订:'6c40c18',时间:'2013-04-09 17:22:56' 系统信息:os.name : 'Linux', os.arch: 'i386', os.version: '3.8.0-19-generic', java.version: '1.7.0_21' 会话 ID: efc7cf60-d8f6-11e2-9f07-192e7e451712 驱动程序信息: org.openqa.selenium.remote.RemoteWebDriver Capabilities [{platform=LINUX, acceptSslCerts=false, javascriptEnabled=true, browserName=phantomjs, rotatable=false, driverVersion=1.0.3, locationContextEnabled=false, version=1.9.0, cssSelectorsEnabled =true,databaseEnabled=false,handlesAlerts=false,browserConnectionEnabled=false,proxy={proxyType=direct},nativeEvents=true,webStorageEnabled=false,driverName=ghostdriver,applicationCacheEnabled=false,TakeScreenshot=true}]} =======
/**
* Retrieves an element from the cache. Will verify that the element is
* still attached to the DOM before returning.
* @param {string} key The element's key in the cache.
* @param {Document=} opt_doc The document whose cache to retrieve the element
* from. Defaults to the current document.
* @return {Element|Window} The cached element.
*/
bot.inject.cache.getElement = function(key, opt_doc) {
key = decodeURIComponent(key);
var doc = opt_doc || document;
var cache = bot.inject.cache.getCache_(doc);
if (!goog.object.containsKey(cache, key)) {
// Throw STALE_ELEMENT_REFERENCE instead of NO_SUCH_ELEMENT since the
// key may have been defined by a prior document's cache.
throw new bot.Error(bot.ErrorCode.STALE_ELEMENT_REFERENCE,
'Element does not exist in cache');
}
var el = cache[key];
// If this is a Window check if it's closed
if (goog.object.containsKey(el, 'setInterval')) {
if (el.closed) {
delete cache[key];
throw new bot.Error(bot.ErrorCode.NO_SUCH_WINDOW,
'Window has been closed.');
}
return el;
}
// Make sure the element is still attached to the DOM before returning.
var node = el;
while (node) {
if (node == doc.documentElement) {
return el;
}
node = node.parentNode;
}
delete cache[key];
throw new bot.Error(bot.ErrorCode.STALE_ELEMENT_REFERENCE,
'Element is no longer attached to the DOM');
};