But, if we trace the execution flow of Selenium isElementPresent() api as
follows,
Selenium.prototype.isElementPresent = function(locator) {
/**
* Verifies that the specified element is somewhere on the page.
* @param locator an <a href="#locators">element locator</a>
* @return boolean true if the element is present, false otherwise
*/
var element = this.browserbot.findElementOrNull(locator);
if (element == null) {
return false;
}
return true;
};
* Finds an element on the current page, using various lookup protocols
*/
BrowserBot.prototype.findElementOrNull = function(locator, win) {
locator = parse_locator(locator);
if (win == null) {
win = this.getCurrentWindow();
}
var element = this.findElementRecursive(locator.type, locator.string,
win.document, win);
if (element != null) {
return this.browserbot.highlight(element);
}
// Element was not found by any locator function.
return null;
};
BrowserBot.prototype.findElementRecursive = function(locatorType,
locatorString, inDocument, inWindow) {
var element = this.findElementBy(locatorType, locatorString, inDocument,
inWindow);
if (element != null) {
return element;
}
for (var i = 0; i < inWindow.frames.length; i++) {
// On some browsers, the document object is undefined for
third-party
// frames. Make sure the document is valid before continuing.
if (inWindow.frames[i].document) {
element = this.findElementRecursive(locatorType, locatorString,
inWindow.frames[i].document, inWindow.frames[i]);
if (element != null) {
return element;
}
}
}
};
Seems your observation of infinite loop is actually a normal behavior for
Selenium to repeatedly locate the element from different frames
as shown in the findElementRecursive() function and it should return null
eventually. Your root cause seems to be caused by
timeout as shown in the log,
"com.thoughtworks.selenium.
HttpCommandProcessor.throwAssertionFailureExceptionOrError:
com.thoughtworks.selenium.SeleniumException: ERROR: Command timed out:
ERROR: Command timed out * Mon Mar 22 17:20:49 GMT 2010"
Perhaps you have many frames in your web page and IE8 is slow to search them
one by one? How about to increase the timeout threshold
for the isElementPresented() call?
Thanks,
Jian
On Mon, Mar 22, 2010 at 2:22 PM, Jian Fang <[email protected]> wrote:
> That is kinda strange. Seems the locate function has returned to Selenium
> API isElementPresented() call.
>
> This is proved from the log and the following code snippet.
>
> Tellurium.prototype.locateElementWithCacheAware = function(locator,
> inDocument, inWindow){
> var element = null;
>
> var json = locator;
> !tellurium.logManager.isUseLog || fbLog("JSON presentation of the cache
> aware locator: ", json);
> var cal = JSON.parse(json, null);
> !tellurium.logManager.isUseLog || fbLog("Parsed cache aware locator: ",
> cal);
>
> !tellurium.logManager.isUseLog || fbLog("Tellurium Cache option: ",
> this.isUseCache());
> if (this.isUseCache()) {
> //if Cache is used, try to get the UI element from the cache first
> element = this.getUiElementFromCache(cal.rid);
> !tellurium.logManager.isUseLog || fbLog("Got UI element " + cal.rid
> + " from Cache.", element);
>
> if (element != null) {
> //need to validate the result from the cache
> !tellurium.logManager.isUseLog || fbLog("Trying to validate the
> found UI element " + cal.rid, element);
> if (!validateDomRef(element)) {
> fbError("The UI element " + cal.rid + " from cache is not
> valid", element);
> this.cache.relocateUiModule(cal.rid);
> //after relocating the UI module, retry to get the UI
> element from the cache
> element = this.getUiElementFromCache(cal.rid);
> !tellurium.logManager.isUseLog || fbLog("After relocating
> UI module, found ui element" + cal.rid, element);
> }
> }else{
> if(cal.locator != null && cal.locator.trim().length > 0){
> //If cannot find the UI element from the cache, locate it
> as the last resort
> !tellurium.logManager.isUseLog || fbLog("Trying to locate
> the UI element " + cal.rid + " with its locator " + cal.locator + " because
> cannot find vaild one from cache", cal);
> element = this.locate(cal.locator);
> }
> }
> }else{
> !tellurium.logManager.isUseLog || fbLog("Trying to locate the UI
> element " + cal.rid + " with its locator " + cal.locator + " because cache
> option is off", cal);
> element = this.locate(cal.locator);
> }
>
> if(element == null){
> fbError("Cannot locate element for uid " + cal.rid + " with locator
> " + cal.locator, element);
> }
>
> !tellurium.logManager.isUseLog || fbLog("Returning found UI element ",
> element);
> return element;
> };
>
>
>
>
> On Mon, Mar 22, 2010 at 2:04 PM, dominicm <[email protected]>wrote:
>
>>
>>
>> Apologies I hit return when i was still composing the message! To be
>> more specific, this problem only happens if the element doesn't exist
>> on the page.
>>
>> Not sure if this is a selenium bug or not, but what seems to be
>> happening is that isElementPresent is getting stuck in an infinite
>> loop, presumably because the returned value is null. Exact same tests
>> are fine in FF and googlechrome. I'm using IE8.
>>
>> Here are snippets from the engine log.
>>
>> "Issue Bundle Command "
>>
>> "[{"uid":"mainColumn.pods.largePodContainer[1].events[1].eventName","args":
>> ["jquery=#podsContainer div.Expander:not(.narrow):eq(0) div.podContent
>> > table > tbody > tr:eq(0)
>> td.eventName"],"name":"isElementPresent","sequ":8}]"
>> "Dispatching command: " Object sequ=8
>> uid="mainColumn.pods.largePodContainer[1 ..." name="isElementPresent"
>> args=[1]
>> "Update argument list for command isElementPresent" Object sequ=8
>> uid="mainColumn.pods.largePodContainer[1 ..." name="isElementPresent"
>> args=[1]
>> "Command after updating argument list: " Object sequ=8
>> uid="mainColumn.pods.largePodContainer[1 ..." name="isElementPresent"
>> args=[1]
>> "delegate command to Selenium" Object sequ=8
>> uid="mainColumn.pods.largePodContainer[1 ..." name="isElementPresent"
>> args=[1]
>> "Delegate Call isElementPresent to Selenium" Object sequ=8
>> uid="mainColumn.pods.largePodContainer[1 ..." name="isElementPresent"
>> args=[1]
>> "JSON presentation of the cache aware locator: "
>>
>> "{"rid":"mainColumn.pods.largePodContainer[1].events[1].eventName","locator":"jquery=#podsContainer
>> div.Expander:not(.narrow):eq(0) div.podContent > table > tbody >
>> tr:eq(0) td.eventName"}"
>> "Parsed cache aware locator: " Object
>> rid="mainColumn.pods.largePodContainer[1 ..."
>> locator="jquery=#podsContainer div.Expander: ..."
>> "Tellurium Cache option: " false
>> "Trying to locate the UI element
>> mainColumn.pods.largePodContainer[1].events[1].eventName with its
>> locator jquery=#podsContainer div.Expander:not(.narrow):eq(0)
>> div.podContent > table > tbody > tr:eq(0) td.eventName because cache
>> option is off" Object rid="mainColumn.pods.largePodContainer[1 ..."
>> locator="jquery=#podsContainer div.Expander: ..."
>> >>> console.trace(stack)
>> function"[object Object]"argumentsundefined
>> function"[object Object]"argumentsundefined
>> function"[object Object]"argumentsundefined
>> "Cannot locate element for uid
>> mainColumn.pods.largePodContainer[1].events[1].eventName with locator
>> jquery=#podsContainer div.Expander:not(.narrow):eq(0) div.podContent >
>> table > tbody > tr:eq(0) td.eventName" null
>> "Returning found UI element " null
>> "JSON presentation of the cache aware locator: "
>>
>> "{"rid":"mainColumn.pods.largePodContainer[1].events[1].eventName","locator":"jquery=#podsContainer
>> div.Expander:not(.narrow):eq(0) div.podContent > table > tbody >
>> tr:eq(0) td.eventName"}"
>> "Parsed cache aware locator: " Object
>> rid="mainColumn.pods.largePodContainer[1 ..."
>> locator="jquery=#podsContainer div.Expander: ..."
>> "Tellurium Cache option: " false
>>
>> <snip>
>>
>> "Trying to locate the UI element
>> mainColumn.pods.largePodContainer[1].events[1].eventName with its
>> locator jquery=#podsContainer div.Expander:not(.narrow):eq(0)
>> div.podContent > table > tbody > tr:eq(0) td.eventName because cache
>> option is off" Object rid="mainColumn.pods.largePodContainer[1 ..."
>> locator="jquery=#podsContainer div.Expander: ..."
>> >>> console.trace(stack)
>> function"[object Object]"argumentsundefined
>> function"[object Object]"argumentsundefined
>> function"[object Object]"argumentsundefined
>> "Cannot locate element for uid
>> mainColumn.pods.largePodContainer[1].events[1].eventName with locator
>> jquery=#podsContainer div.Expander:not(.narrow):eq(0) div.podContent >
>> table > tbody > tr:eq(0) td.eventName" null
>> "Returning found UI element " null
>> "Issue Bundle Command " "[{"uid":"","args":
>> [],"name":"isAlertPresent","sequ":9}]"
>> "Dispatching command: " Object sequ=9 uid="" name="isAlertPresent"
>> args=Object
>> "Command after updating argument list: " Object sequ=9 uid=""
>> name="isAlertPresent" args=Object
>> "delegate command to Selenium" Object sequ=9 uid=""
>> name="isAlertPresent" args=Object
>> "Delegate Call isAlertPresent to Selenium" Object sequ=9 uid=""
>> name="isAlertPresent" args=Object
>>
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