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Selenium stop page load as soon as expected element exist

I created few test cases on Selenium using Java. Unfortunately when I click an element on the page, before I could move on to any other action, I have to wait till the page loads.
I have tried driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);. Unfortunately this creates another problem. Even if the page loads, it waits 30 seconds before it started testing on the page.
What I found the best way is to send ESCAPE key to stop page load.
Is there anyway I could check if an element exists and when it does, send ESCAPE key to the browser to stop page load?
This part is bugging my mind as I have to wait till page loads before Java reads the next line of the code so I can't send ESCAPE key to browser till the page actually stops loading.
Edit
I have just tried using a new thread to do the job but it seems driver is completely locked out, can't do any process on it before page stops loading.
I'm out of ideas for the moment but I believe there should be a way.
Using timeouts() is causing whole test case to stop.

First I'd like to say this isn't a best practice. The selenium click method states that if the click triggers a page load, selenium will do its best to block until the page is loaded. Instead of clicking via the click method you could try sending the click event via JavaScript. Then wait for the element like normal.

You can try driver.manage().timeouts().pageLoadTimeout(10, TimeUnit.SECONDS); It is supposed to throw an error after timeout is over. I have never used it but maybe you can try and catch this error and continue with your test. But your page could end up in an unstable state with everything not loading and test interacts with elements.

I did it in C#, scenario is the same elsewhere.
Define driver like this:
var firefoxOptions = new FirefoxOptions();
firefoxOptions.PageLoadStrategy = PageLoadStrategy.None;
driver = new FirefoxDriver(firefoxOptions);
PageLoadStrategy.None means when open a URL, continue to next line regardless of the results and do not wait to load the page.
Usually, it takes some seconds to load a page and element appears, suppose I'm waiting for email_user element to appears:
int user_emailID = 0, popupAlert = 0;
do
{
float timeToWait = 0;
driver.Navigate().GoToUrl("https://stackoverflow.com");
do
{
await Task.Delay(500);
timeToWait += 0.5F;
user_emailID = driver.FindElements(By.XPath("//input[#id=\'user_email\']")).Count;
}
while (user_emailID == 0 && timeToWait < 10);
if (user_emailID == 1)
{
//Element exists now!do something and don't wait for page to load completely
}
}
while (user_emailID != 1);
More explanation: when open a URL, first loop check the presence of element every 0.5 second, if it appears, the loop stops. If after 10 seconds it couldn't find the element, the page will reloaded !!
Hope this get you the idea.
Remember, exception must not happen in your codes !!

Gwt reloading is getting called multiple times

I am developing web application with java-gwt. In one case i need to reload the browser tab, for that i used
"Window.Location.reload()", but it is reloading the browser continuosly, I do not know what might be the reason, Please look into the following code:
String existedLoginId = (String) Offline.get(GroupCookies.grpId.getCookieName());
String updatedLoginId = com.google.gwt.user.client.Window.Location.getParameter("groupId");
if (existedLoginId.equals(updatedLoginId)) {
LoginInfo.setSessionId(Cookies.getCookie(GroupCookies.dsessionId.getCookieName()));
} else {
**Window.Location.reload();**
}

Window.Location.reload() reloads the webpage once, as intended. The issue is that your code is being executed everytime.
If existedLoginId.equals(updatedLoginId) returns false, it will reload, then it will return false again, then it will reload ad nauseum.
If it is false, once, when it reloads, something should happen to make existedLoginId.equals(updatedLoginId), otherwise you will get a infinite loop.

How can I detect a close in the browser tab?

Hello I am looking for information on the close tab (not browser) event if there is one in java for a applet. I am wondering if there is an event for that or a way to check a way to check for that. I would like to just capture the event and make a little popup box , stating Your session will expire or something along those lines. Is that possible at all or to a point with java or Javascript?
UPDATE: okay with the information you guys pointed me into i was able to get information on a simple enough javascript. Now it is working fine in IE , Chrome and Firefox but for some reason Safari 5.1.7 isn't liking the code. Not sure why. Here is the code if it helps.
jQuery(function() {
var hiddenBtn = document.getElementById("javaform:browserCloseSubmit");
try{
opera.setOverrideHistoryNavigationMode('compatible');
history.navigationMode = 'compatible';
}catch(e){}
//Sends the information to the javaBean.java file.
function ReturnMessage()
{
return hiddenBtn.click();
}
//UnBind Function
function UnBindWindow()
{
jQuery(window).unbind('beforeunload', ReturnMessage);
}
//Bind Exit Message Dialogue
jQuery(window).bind('beforeunload', ReturnMessage);
});

You have the onBeforeUnload event you can catch in JavaScript. See here.

Use window.onbeforeunload
window.onbeforeunload = function () {
return "Are you sure you want to exit?";
};
Note that it will also end in Are you sure you want to leave this page (or are you sure you want to reload this page if you are reloading)

selecting pulldown in htmlunit

I am using htmlunit in jython and am having trouble selecting a pull down link. The page I am going to has a table with other ajax links, and I can click on them and move around and it seems okay but I can't seem to figure out how to click on a pulldown menu that allows for more links on the page(this pulldown affects the ajax table so its not redirecting me or anything).
Here's my code:
selectField1 = page.getElementById("pageNumSelection")
options2 = selectField1.getOptions()
theOption3 = options2[4]
This gets the option I want, I verify its right. so I select it:
MoreOnPage = selectField1.setSelectedAttribute(theOption3, True)
and I am stuck here(not sure if selecting it works or not because I don't get any message, but I'm not sure what to do next. How do I refresh the page to see the larger list? When clicking on links all you have to do is find the link and then select linkNameVariable.click() into a variable and it works. but I'm not sure how to refresh a pulldown. when I try to use the webclient to create an xml page based on the the select variable, I still get the old page.
to make it a bit easier, I used htmlunit scripter and got some code that should work but its java and I'm not sure how to port it to jython. Here it is:
try
{
page = webClient.getPage( url );
HtmlSelect selectField1 = (HtmlSelect) page.getElementById("pageNumSelection");
List<HtmlOption> options2 = selectField1.getOptions();
HtmlOption theOption3 = null;
for(HtmlOption option: options2)
{
if(option.getText().equals("100") )
{
theOption3 = option;
break;
}
}
selectField1.setSelectedAttribute(theOption3, true );

Have a look at HtmlForm getSelectedByName
HtmlSelect htmlSelect = form.getSelectByName("stuff[1].type");
HtmlOption htmlOption = htmlSelect.getOption(3);
htmlOption.setSelected(true);

Be sure that WebClient.setJavaScriptEnabled is called. The documentation seems to indicate that it is on by default, but I think this is wrong.
Alternatively, you can use WebDriver, which is a framework that supports both HtmlUnit and Selenium. I personally find the syntax easier to deal with than HtmlUnit.

If I understand correctly, the selection of an option in the select box triggers an AJAX calls which, once finished, modifies some part of the page.
The problem here is that since AJAX is, by definition, asynchronous, you can't really know when the call is finished and when you may inspect the page again to find the new content.
HtmlUnit has a class named NicelyResynchronizingAjaxController, which you can pass an instance of to the WebClient's setAjaxController method. As indicated in the javadoc, using this ajax controller will automatically make the asynchronous calls coming from a direct user interaction synchronous instead of asynchronous. Once the setSelectedAttribute method is called, you'll thus be able to see the changed made to the original page.
The other option is to use WebClient's waitForBackgrounfJavascript method after the selection is done, and inspect he page once the background JavaScript has ended, or the timeout has been reached.

This isn't really an answer to the question because I've not used HtmlUnit much before, but you might want to look at Selenium, and in particular Selenium RC. With Selenium RC you are able to control the interactions with a page displayed in a native browser (Firefox for example). It has developer API's for Java and Python amongst others.
I understand that HtmlUnit uses its own javascript and web browser rendering engine and I'm wondering whether that may be a problem.

Handling self-refreshing pages from selenium

I have been running into intermittent errors with some java selenium-rc tests which I think are related to a page which has an ajax poll and automatically refreshes when some condition is reached on the server. In this scenario, I have no way of asking selenium to wait for the page to load, and so I run into a bunch of random "Couldn't access document.body" errors.
So, is there some way I can cause selenium to gracefully handle this situation? If not, is there some way I could detect whether the user is selenium from the page's javascript, and disable the automatic refresh?
If it helps at all, the javascript code in the page looks something like...
var ajax = new Ajax(url, {
update: state,
method: 'get',
onComplete: function(message) {
if (some_condition) {
window.location.replace(unescape(window.location));
}
}
});

One solution might be to always use a waitForCondition using isElementPresent before attempting to interact with the application under test. You could put the following method in a superclass to keep your tests more readable. Alternatively you could create helper methods for common Selenium commands that perform this wait.
/** Waits for an element to be present */
public static void waitForElementToBePresent(String locator) {
session().waitForCondition("var value = selenium.isElementPresent('" + locator.replace("'", "\\'") + "'); value == true", "60000");
}
You may also want to wait for the element to be visible, as waiting for it to just be present isn't always enough (imagine a textbox that is always present but hidden until a certain condition). You can combine this with the above method:
/** Waits for an element to be visible */
public static void waitForElementToBeVisible(String locator) {
waitForElementToBePresent(locator);
session().waitForCondition("var value = selenium.isVisible('" + locator.replace("'", "\\'") + "'); value == true", TIMEOUT);
}
Incidentally, the WebDriver (Selenium 2) team are working on having implicit waits, specifically to address AJAX issues where elements are not present immediately.

My solution was to disable the refresh in javascript by wrapping it in something like the following...
var isSeleniumActive = parent.seleniumAlert;
if (isSeleniumActive) {
alert("Selenium");
} else {
alert("Not selenium");
}
I'm not sure if the seleniumAlert function here is likely to sick around forever, so be aware if you're taking this that you may be relying on internal selenium implementation details of selenium.

There i was facing the same problem and i use a single line of code and it helps.
i was getting the error about the page is getting auto refresh
plus this warning:
-1490472087141 Marionette WARN Using deprecated data structure for setting timeouts
all i use is
Thread.sleep(2000)
and it worked for me.

I think that you can pause, or use a click and wait. There are a few good articles on the google. Good luck.
Edit for your comment:
How about the waitFor command?