JSP invoked method inside onclick property of html form

I have an html form with an action to itself. I'm using javabeans with jsp to hold a list of strings. I want to click a button on the html form and have it add to the list of strings. however, if I put onclick="<% mybean.addString("sample") %>" inside the button's tag, it executes the code every time I load the page, instead of only when the button is pressed. What do I have wrong here, and what's the code to fix it?

jobocop17 wrote:
What do I have wrong here, and You have misunderstood how web application works. Basically, server side code(jsp scriptlets, custom tags etc) get processed in server and the processed results are sent to client side where the client side code(eg: javascript) get executed. Following jsp code
<% mybean.addString("sample") %>is processed in server and the browser will only get its result which is what you have noticed and which is how it works.
what's the code to fix it?Use either clientside scripting or make a server call to get it done on serverside.

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     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
     at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
     at oracle.adfinternal.view.faces.renderkit.rich.FormRenderer.encodeAll(FormRenderer.java:274)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
     at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
     at oracle.adfinternal.view.faces.renderkit.rich.DocumentRenderer.encodeAll(DocumentRenderer.java:1277)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1655)
     at oracle.adfinternal.view.faces.component.AdfViewRoot.encodeAll(AdfViewRoot.java:91)
     at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:399)
     at org.apache.myfaces.trinidadinternal.application.ViewDeclarationLanguageFactoryImpl$ChangeApplyingVDLWrapper.renderView(ViewDeclarationLanguageFactoryImpl.java:350)
     at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
     at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:273)
     at org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:165)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._renderResponse(LifecycleImpl.java:1027)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:334)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:232)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:173)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:122)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
     at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:293)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199)
     at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:180)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
     at java.security.AccessController.doPrivileged(Native Method)
     at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
     at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
     at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
     at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
     at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
<Utils> <buildFacesMessage> ADF: Adding the following JSF error message: Cannot invoke method multiply() on null object
any help please ?

Thanks Frank ,
really i've already downloaded the ZIP of the final application , but the same error message ,
when removing the Annual salary ( Which is a new Attribute ( not DB column) Salary * 12 ) every think is fine and no more error message ,there is no null salary all the employees have a salary , my JDeveloper Version is 11.1.2.1.0
also , because of the EmpDetails is based on the query
FROM EMPLOYEES Employees, DEPARTMENTS Departments
WHERE Employees.DEPARTMENT_ID = Departments.DEPARTMENT_ID
and the Department id is non editable value , that means even if you add a new user u cant never check this user in this interface , u can check this user only on DB (SQL) level .
Edited by: 876602 on Jul 1, 2012 5:17 AM

Can't pass parameter from HTML form of multipart/form-dta type to JSP

I am using request.getParameter(passed variable name) to pass data from HTML form to JSP with no problem. WHen I try to pass data from HTML form of multipart/form-dta type to JSP as following:
< form enctype="multipart/form-data" name="theForm" method="post" ACTION="http://titan.ssd.loral.com:7778/ifs/jsp-bin/ifs-cts/stringsecond.jsp">
The passed value is null. Why?
How can I pass data successfully from this form to JSP?
How can I pass data from JavaScript to JSP?
Thank you

I am using request.getParameter(passed variable name)
to pass data from HTML form to JSP with no problem.
WHen I try to pass data from HTML form of
multipart/form-dta type to JSP as following:
< form enctype="multipart/form-data" name="theForm"
method="post"
ACTION="http://titan.ssd.loral.com:7778/ifs/jsp-bin/if
-cts/stringsecond.jsp">
The passed value is null. Why?because the jsp most likely does not handling of POST parameters like this.
How can I pass data successfully from this form to
JSP?jsp's are not meant to read such amounts of data. this (= uploading) is a typical task for a specialized servlet. there you have full control over input and output. if you need to, you can still forward to a jsp after processing in the servlet.
How can I pass data from JavaScript to JSP???? i'm not sure what exactly you mean. normally you put it into an url and submit it.
robert

Using JSP, HTML Form for uploading image in order to be saved into a db

I have a HTML form and I am using <input type="file"> tag. The problem is that I don't know the Java code needed for the JSP page in order to get through the path and get the image(of course I refer to binary object). Below there is the html code
<%@ page language="java" import="java.sql.*, java.awt.*, java.awt.Event, java.util.*, java.io.*, javax.servlet.*"%>
<html>
<head>
</head>
<body>
<div align="left"></div>
<form action="action.jsp" method="POST" name="form"
<h1>Add Data</h1>
<table>
<tr>
<td>Name</td>
<td><input type="text" name="Name" value="" /></td>
</tr>
<tr>
<td>Last Name</td>
<td><input type="text" name="lastname" value=""/></td>
</tr>
<tr>
<td>Studies</td>
<td><textarea name="studies" rows="4" cols="20" >
</textarea>
</td>
</tr>
<tr>
<td>General Data</td>
<td><textarea name="gendata" rows="4" cols="20">
</textarea>
</td>
</tr>
<tr>
<td>Photo</td>
<td><input type="File" name="photo"/></td>
</tr>
<tr>
<td> <input type="submit" > </td>
</tr>
</table>
</form>
If you want to view the Personnel List click here<br>
Go to index
</body>
</html>

A JSP should not be involved in this. The browser will offer a way to specify a file, and the target of the form should be a servlet that can handle multipart uploads. JSPs should not process any input.
More info: http://www.jguru.com/faq/view.jsp?EID=160 or Google

JSP part of HTML form

i have an html form (part of code included below) and don't know how to write the JSP for the results page. I want to be able to click "submit" and have the inputed information placed in a text file and saved in the same folder as my HTML files. I am new to JSP and am trying to learn. thanks in advance.
code:
<html>
<head>
<title>Form</title>
</head>
<form name="input" action="html_form_action.asp" method="get" >
Model Name:
<br>
<input type="text" name="modelname">
<br>
Lenght Unit:
<br>
<input type="text" name="lenghtunit">
<br>
<br>
<TEXTAREA ROWS="5" COLS="50">

You need to learn some java first. Then learn a bit about JSP. It isn't like classic ASP.
Then write a java class that takes arguments and writes them to a file. It will be good practice for making the full bean. :)
When you're comfortable with the class and it does what you want (writes things to a file), make the class a bean (use a package) and make the arguments be gettable and settable properties and have a method do the write using those properties (instead of main doing it).
Put the bean in a JSP and set the properties and call the method that writes them to a file.
If you can't follow that, you're not ready to write it. Go, read, learn more about java and java beans, and come back to this.
Note that you may have permissions problems if the directory the class writes to is not writable by the user that the web server runs as.
Note on your html page: you should be targetting a JSP page, not ASP, and you should be using POST, not GET, as the method.
HTH

Html form-jsp retrieval problem..very urgent plz help

i have created the following html form.
<form method="POST" action="b.jsp" >
            Insert Feed URL <input type="text" name=""></br></br>
                    <input type="submit" value="Search"> <input type ="reset" value ="Reset">now when i click search i should be able to get that url which i inserted in the text box through b.jsp which has the code for retrieving it. it is basically a .xml url. hence i have used
object.put("1", " ");
in the b.jsp(just a part of the code)
what value should i put in between the quotes(" ") so that i retrieve the info as per the url input in the html form.
kindly help
very urgent
cheers

ok i tried but i got the following error:
symbol : variable request
location: class org.apache.jsp.b_jsp.FeedServer
                        object.put("1",request.getParameter("feedURL"));
                                      ^
1 error
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
     org.apache.jasper.compiler.AntCompiler.generateClass(AntCompiler.java:246)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)i also tried this
String feedURL = request.getParameter("feedURL");
object.put("1","feedURL");
but still errors
Generated servlet error:
.java:30: feedURL is already defined in org.apache.jsp.b_jsp.FeedServer
             String feedURL = request.getParameter("feedURL");
                    ^
Generated servlet error:
java:30: cannot find symbol
symbol : variable request
location: class org.apache.jsp.b_jsp.FeedServer
             String feedURL = request.getParameter("feedURL");
                              ^
2 errors
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
     org.apache.jasper.compiler.AntCompiler.generateClass(AntCompiler.java:246)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)

JSP invoked method inside onclick property of html form

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