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Call JSP function with JSoup

I'm trying to scrape a .jsp webpage with Jsoup. The page I'm trying to scrape is basically a 6 steps form, filling each form takes me to another one but to do so I must click a button that calls a jsp function. I don't know how to do so with jsoup.
So here is a piece of the jsp page I'm trying to scrape.
<img id="nextButtonId" onkeypress="disableButtons(this);onIntroductionFormSubmit()" height="50"
alt="suivant" title="suivant" src="/eAppointment54-etrangers/element/images/buttons/next.gif"
**onclick="disableButtons(this);onIntroductionFormSubmit()"** onmouseover="downNextSrcPicture(this);"
onmouseout="upNextSrcPicture(this);" style="display: block;">
I want to call the onclick methods onclick="disableButtons(this);onIntroductionFormSubmit(). Maybe there is a way I can do this without having to simulate the actual clicking.
Thanks in advance !!!

Jsoup is not a browser engine, it is just an HTML parser/writer. To do such a thing you should do one of these, I recommend the first one:
Implement the method yourself (it's probably just an HTTP call)
Use an automation library like Selenium (no experience)
(Not recommended) Run a full browser environment such as JavaFX WebView and inject code to do the action.

Reading HTML using jsoup

so i am trying to get an HTML element from a website using Jsoup, but the HTML that i get from the Jsoup.connect(url) is not complete compared to the one that i get using the inspector on the website.
EDIT : this is the link i'm working with https://www.facebook.com/livemap##35.831640894,24.82275312499999,2z
The numbers in the end designate the coordinates of the map, and you don't have to sign in to access the page, so there is no authentication problem
UPDATE :
So i have found that the element that i want does not get expanded using jsoup, is this a problem related to slow page loading ? If so, how can i make sure that Jsoup.connect(url) fully loads the webpage before fetching the HTML
from inspector (the <div id="u_0_e"> is expanded)
from jsoup.connect (the <div id="u_0_e"> is not expanded)

Jsoup dont execute javascript or jQuery events, so you will get a initial page before executing javascript.

Going to next page on an aspx form with JSoup

I'm trying to go to the next page on an aspx form using JSoup.
I can find the next button itself. I just don't know what to do with it.
The idea is that, for that particular form, if the next button exists, we would simulate a click and go to the next page. But any other solution other than simulating a click would be fine, as long as we get to the next page.
I also need to update the results once we go to the next page.
// Connecting, entering the data and making the first request
...
// Submitting the form
Document searchResults = form.submit().cookies(resp.cookies()).post();
// reading the data. Everything up to this point works as expected
...
// finding the next button (this part also works as expected)
Element nextBtn = searchResults.getElementById("ctl00_MainContent_btnNext");
if (nextBtn != null) {
// click? I don't know what to do here.
searchResults = ??? // updating the search results to include the results from the second page
}
The page itself is www.somePage.com/someForm.aspx, so I can't use the solution stated here:
Android jsoup, how to select item and go to next page
I was unable to find any other suggestions.
Any ideas? What am I missing? Is simulating a click even possible with JSoup? The documentation says nothing about it. But I'm sure people are able to navigate these type of forms.
Also, I'm working with Android, so I can't use HtmlUnit, as stated here:
importing HtmlUnit to Android project
Thank you.

This is not Jsoup work! Jsoup is a parser with a nice DOM API that allows you to deal with wild HTML as if it were well-formed and not crippled with errors and nonsenses.
In your specific case you may be able to scrape the target site directly from your app by finding links and retrieving HTML pages recursively. Something like
private void scrape(String url) {
Document doc = Jsoup.connect(url).get();
// Analyze current document content here...
// Then continue
for (Element link : doc.select(".ctl00_MainContent_btnNext")) {
scrape(link.attr("href"));
}
}
But in the general case what you want to do requires far more functionality that Jsoup provides: a user agent capable of interpreting HTML, CSS and Javascript with a scriptable API that you can call from your app to simulate a click. For example Selenium:
WebDriver driver = new FirefoxDriver();
driver.findElement(By.name("next_page")).click();
Selenium can't be bundled in an Android app, so I suggest you put your Selenium code on a server and make it accessible with some REST API.

Pagination on ASPX can be a pain. The best thing you can do is to use your browser to see the data parameters it sends to the server, then try to emulate this in code.
I've written a detailed tutorial on how to handle it here but it uses the univocity HTML parser (which is commercial closed source) instead of JSoup.
In short, you should try to get a <form> element with id="aspnetForm", and read the form elements to generate a POST request for the next page. The form data usually comes out with stuff such as this:
__EVENTTARGET =
__EVENTARGUMENT =
__VIEWSTATE = /wEPDwUKMTU0OTkzNjExNg8WBB4JU29ydE9yZ ... a very long string
__VIEWSTATEGENERATOR = 32423F7A
... and other gibberish
Then you need to look at each one of these and compare with what your browser sends. Sometimes you need to get values from other elements of the page to generate a similar POST request. You may have to REMOVE some of the parameters you get - again, make your code behave exactly the same as your browser
After some (frustrating) trial and error you will get it working. The server should return a pipe-delimited result, which you can break down and parse. Something like:
25081|updatePanel|ctl00_ContentPlaceHolder1_pnlgrdSearchResult|
<div>
<div style="font-weight: bold;">
... more stuff
|__EVENTARGUMENT||343908|hiddenField|__VIEWSTATE|/wEPDwU... another very long string ...1Pni|8|hiddenField|__VIEWSTATEGENERATOR|32423F7A| other gibberish
From THAT sort of response you need to generate new POST requests for the subsequent pages, for example:
String viewState = substringBetween(ajaxResponse, "__VIEWSTATE|", "|");
Then:
request.setDataParameter("__VIEWSTATE", viewState);
There are will be more data parameters to get from each response. But a lot depends on the site you are targeting.
Hope this helps a little.

How to map server response retrieved in jsp to an iFrame

I'm using struts2 framework(java/js/html/css combo) for my webapp. I am reading a text file from server and I want to write the response to an iFrame present in the same jsp.
Flow:
(1) On click of a link, I pass the relative URL of the text file to jsp.
(2) When the jsp page loads, the java code in the jsp reads the file from server.
(3) Now this response has to be written to an iFrame present in the same jsp file
Can anyone plz help me in writing such response to an iFrame?
Thanks in advance :)

[code not tested, only a demostration of the concept]
here's some very rough idea as to how to fix your code, they definitly not the best but they should be enough to help you understand the concept.
However I'd still recommend going over the whole concept and maybe come up with a more efficent way to do what you need.
if you insist on using iframe, you need to make use of 2 seperate jsp as W3C says in "Implementing HTML Frames":
Any frame that attempts to assign as its SRC a URL used by any of its ancestors is treated as if it has no SRC URL at all (basically a blank frame).
so you'll need 2 jsp, the first one is basically what you have but the the src of the iframe changed to:
<iframe scrolling="yes" width="80%" height="200" src="second.jsp?content=<%=all%>" name="imgbox" id="imgbox">
and the second one will be something like :
<html><body><%= request.getAttribute("content") %></body></html>
From the code you've shown you forced a "content update" on the iframe by using javascript. The proper/usual way to update an iframe is to provide different input parameter to the second jsp and let it update it for you.
Finally, I'd recommend using JSTL as much as possible instead of scriptlets. It is much cleaner.

What you need to do is set the src attribute of the IFRAME to the jsp url when your link is clicked. Another way to do it is doing something like this:
<iframe src="" name="iframe_a"></iframe>
<p>W3Schools.com</p>
with the correct parameters of course

Fetching the website with Jsoup - page view source and Jsoup shows different content

I use Jsoup to scrap the website:
doc = Jsoup.connect(String.valueOf(urls[0])).userAgent("Mozilla").get();
Here is the link:
http://www.yelp.com/search?find_desc=restaurant&find_loc=willowbrook%2C+IL&ns=1#l=p:IL:Willowbrook::&sortby=rating&rpp=40
I have added rpp=40 parameter to the link in the command line to display 40 results per page. I'm able to see all the results in page view source.
I know that Jsoup is for the static content only and cannot fetch the websites that use AJAX/JS Libraries technique to generate content. However why Jsoup cannot retrieve the same content as I can see in the browser via page view source? Page view source shows 40 results whereas Jsoup is able to retrieve elements from only 10 results? How can I obtain every elements visible via page view source.

Short answer Jsoup can't execute the Javascript.
Long answer
http://www.yelp.com/search?find_desc=restaurant&find_loc=willowbrook%2C+IL&ns=1#l=p:IL:Willowbrook::&sortby=rating&rpp=40
The webpage your are looking for accepts the Http Get with the parameters. In the normal browser it accepts the params and loads the page . But Not with willowbrook checked(in your example). It loads the JS after it loads the page and the Javascript does the check box for Fliters the serach results. Therefore when you use Jsoup you are getting more results because it loads 'state=IL' without 'willowbrook' filtered.