I have a doubt about the best way to handle the #RequestMapping.
For example:
with this url http://localhost:8080/SpringExample/admin/personaListForm/1 I reach a form, controlled by this #RequestMapping:#RequestMapping("/admin/personaListForm/{tipoPersona}")
As you can see "1" is a variable.
This is my form:<form:form action="personaListFormSent">
As you can see, If I submit the form, I'll be sent to this url http://localhost:8080/SpringExample/admin/personaListForm/personaListFormSent (because of the "/1").
The problem is that i don't want to go there, I want to go to http://localhost:8080/SpringExample/admin/personaListFormSent
I may solve the problem editing the form this way <form:form action="../personaListFormSent"> but it doesn't seem a professional way to handle this problem, since if tomorrow I need to add more variable I'll have to add more "../" to the form tag.
thank you
You can use ${pageContext.request.contextPath}/personaListFormSent.
<form:form action="${pageContext.request.contextPath}/personaListFormSent">
So you will go to http://localhost:8080/SpringExample/personaListFormSent when you post the form.
Send them to action="/personaListFormSent".
'/' is the root of your app, so it doesn't matter which is your context path.
Regards,
Jorge
Related
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
What I want to do:
I have a form with a lot of fields(nick, email, name, surname, etc.) but the user has to fill Nick and Email first in order to be able to fill the other fields(this is because we want to check that the nick and mail aren't in use by another client before he can introduce the rest of his information(name, surname, etc.)).
So, the user introduces Nick and Email and then he must press a button named "Validate", if the values are available(successful validation) then the rest of the fields are enabled and the user can continue filling the form, otherwise the fields stay disabled and an error is showed to the user.
The form will be located in a JSP, it will be submitted to a Servlet, once in the servlet I must validate the information that is in the form(i have a .JAR file included in this servlet, the validation consists in calling a function from that library, the function returns a boolean) and then I must return back to the same JSP the boolean that will represent the result of the validate function.
Now in the JSP I must enable(or not, depending on the value of the boolean) the rest of the TextFields.
I'm not sure if this is right but i was trying to submit with the button and at the same time run a javascript(onclick) that will use this boolean value that the servlet sends back to the JSP after making the validation. The javascript consists on an IF sentence that evaluates the boolean and if it's true then it enables all the fields on the JSP.
Problems so far:
I was able to send the Nick and Email from the JSP to the Servlet and to make the validation of the values, now i have the boolean but i have no idea on how to send it from the Servlet to the same JSP and use it in the onclick event of the same button I used to submit the info. I don't even know if it's possible to do this...
I'd be grateful if someone could give me a hand with this, i'm newbie in Java programming so i would appreciate simple explanations if possible.
Also, if there is a better way of doing what i want please share it, and if there are any doubts ask and i will try to explain it better.
There is no need for JavaScript at all.
In your servlet you can store the validation result into the request context:
req.setAttribute('checkResult', checkResult);
where req is of type HttpServletRequest and checkResult is a Boolean.
Then you can forward to your JSP:
RequestDispatcher dispatcher = req.getRequestDispatcher("/your.jsp");
dispatcher.forward(req, resp);
In your JSP you can set your form elements as read only depending on the attribute checkResult which you have put into the request context:
<textarea name="text" cols="50" rows="10"
<%= request.getAttribute("checkResult") != null && request.getAttribute("checkResult") ? "" : "readonly" %>
>...</textarea>
So if the check is not valid then the <textarea> element will contain the readonly attribute. Otherwise readonly is not present.
As Roy mentioned AJAX is best suited for your problem. You can use DWR! , it makes normal java classes available as AJAX services, just call the method on them and get the result. So easy.
I think AJAX is more suitable for your application, which will not require to submit the whole form and you can send back the validation flag as plain responseText or well-formatted responseXML. Also you can use a lot of good javascript library such as jQuery that helps you send an AJAX request quickly and simply.
I want to forward from one page to another but with the same I want url to be changed. Suppose user is here http://mywebsite/register and when he completes his registration process then I want this in his address bar http://mywebsite/home
Is it possible without using sendRedirect , I mean by the way server side forwarding only? or any other way around to this problem?
You could just let the HTML form submit to that URL directly.
<form action="http://mywebsite/home">
But this makes no sense. You'll also run into problems when redisplaying the same form with validation messages in case of validation failure. You'd need to redirect back to the original page if you intend to keep the original URL and you'd need to fiddle with storing messages in the session scope instead of the request scope because a redirect basically creates a brand new request. You'll without a redirect also run in "double submit" problem whenever the enduser presses F5 after submitting the form.
Just let the servlet redirect the successful POST request to the desired URL. That's the canonical approach. Even more, this is a recommend "design pattern": the POST-Redirect-GET pattern.
AFAIK there's no way around a redirect since the browser has to update the url at some point. And if you'd update the url after the forwarded to page has been loaded it would issue a refresh and the page would be loaded again (which might result in an endless loop).
Why don't you want to use a redirect in that case?
Is there a way to make an AJAX call alter the current page URL without redirecting or reloading the page, in Apache Wicket?
For example, say we are in the url:
localhost:8080/someUrl
I'd like that when I click an ajax link, some action is performed, and the url changes to, say:
localhost:8080/otherUrl
without redirecting, just changing the url displayed in the browser.
Is this even possible?
Thanks!
Manuel
Actually you can !
But this is not related to Wicket at all.
This is what the new History API in HTML5 is about.
Just search for "html5 History API example" in Google and enjoy.
The only part of the url you can change with javascript is the hash
You could change localhost:8080/#/someUrl to localhost:8080/#/otherUrl
Do this with window.location.hash
Here's an example of a flash site which uses this concept to allow for deep-linking URL's: http://www.2advanced.com
Help make this feature happen, vote (or contribute!) for https://issues.apache.org/jira/browse/WICKET-5290
No, it isn't. If you change the location in the browser, a new request is made to that URL.
(You do that with window.location.href = newUrl, but the page reloads)
I need to call from one JSP to another, do some stuff over there..
I am inside the caller jsp, inside his handleReqeust(HttpServletReqeust request)
method I am trying to forward the request to another JSP, to call the other JSP file to his handleRequest(HttpServletReqeust request) off course with the request object
I tried it:
RequestDispatcher dispatcher = request.getRequestDispatcher("/theSecondJspFile.jsp");
if (dispatcher != null)
dispatcher.forward(request, response);
but to make it work I need for it the object response, but I don't have it,
I am sure I missed something basic, but what?
From my question you can see, I don't have solid backround in java, so please correct me, or refer me to good guide if you feel it necessary
Thanks.
-------------------Edit--------------------------------------
I don't need a redirect, I just want to call another JSP file to his handleRequest method
I think it relate to HTML
What I can make out of your question is that you need to redirect to a secondpage.html from firstpage.html with some data. You can use both GET or POST method to send the data.
For the GET method just redirect to secondpage,html?data=value. The data will be available in the HttpRequest parameter in the controller of the secondpage.html where it can be used as required.
For the POST method you would need to post the data (using a form on firstpage.html) to secondpage.html. In the controller of the secondpage.html the data should be available in a similar way as before.
To include another JSP in a jsp :
<jsp:include page="foo.jsp"/>
You can find some reference material here.
I can not be sure, but what I think you are trying to do is to include a jsp page on to your jsp page and use the the objects and other variables declared in the first jsp page in your second.
<%# include file="mypage.jsp" %> should help you do this.
If this is not what you are looking for, please make your question tad bit more clear. some code will help really.
JSPs are supposed to be used to present the final result. JSPs are not supposed to be part of business tasks leading to this result. There you use normal Java classes for, starting with a servlet class. Let the HTTP request (the one which you enter in browser address bar or specify in some HTML link or form) point to the URL of the servlet instead. This way you can write Java code in the servlet the usual way to invoke other Java classes/methods and finally forward the request to a certain JSP file based on the outcome of the result and then just let that JSP present the final result.
To start with servlets, I'd suggest to read our Servlets info page.
I just added empty Iframe, and set his URL when I needed to call him