Using a request scope object in a javascript function

Hello,
is there a way to obtain a reference to a request scope attribute in a javascript function?
or after using <jsp:useBean id="myBean" ...>, how do I pass the "myBean" object to a javascript fuction?
Thanks for any help.
E-

ok, thanks...this is working for a string property of a bean... but I get an 'invalid character' error when I want to create an actual reference to the bean object itself.
here is the jist of what I need to get working... myBean has a property 'listItems' that is a Vector of listBeans.
function buildList() {
var myBean = <%=request.getAttribute("mybean")%> ;
// get referenence to the Vector property listItems
var list = myBean.getListItems();
// now I want to iterate the list and use the properties of the list beans
for (x = 0 ; x < list.size() ; x++ ) {
var listBean = list[x];
var foo = listBean.getFoo();
// need to use foo to populate a hierarchical list
can I do this in JavaScript??? do I need to cast the classes to the variables?

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<%
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%>
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Using JSP parameters as input in a JavaScript function

hey
I have a JavaScript function, which I call with JSP parameters.
The function call looks similar to:
<button onclick="myFunction(<%= jspParameter%>);"> </button>
However, this JavaScript function is called from a jsp page, which is asynchronously refreshed upon a click of the button.
The problem is that the JavaScript function does NOT function when I click the button for the first time (or maybe it functions, but with the old value of the jspParameter).
Only after the second click it starts taking the jspParameter.
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I'm sorry, you're right - I didn't give enough details.
My whole page consists of several jsp-s.
The jsp, from which I call the JavaScript function is just one part of the whole page. I'll call it partToBeChanged.jsp.
When I press the button, the partToBeChanged.jsp should refresh asynchronously and call the JavaScript function using the new jsp parameter as input.
To be more precise, here is roughly how myFunction looks like (JavaScript):
function myFunction(url, jspParam) {
     var XMLHttpRequestObject = false;
     if (window.XMLHttpRequest) {
          XMLHttpRequestObject = new XMLHttpRequest();
     } else if (window.ActiveXObject) {
          XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
     if (XMLHttpRequestObject) {
          XMLHttpRequestObject.open("GET", myServlet + url, true);
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                    //The target is an id of a division, which holds the partToBeChanged.jsp page
                    //The server itself uses RequestDispatcher to direct the response to the partToBeChanged.jsp
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}the jspParam is a java object, initialized in the servlet and used in partToBeChanged.jsp
To summarize: the servlet dispatches the response to the partToBeChanged.jsp page, which uses the jspParam as input for myFunction, and myFunction tries to change the content of the "target" div accorting to the jspParam. However it changes as expected only after the second button click.
Thanks a lot for any help....

How do webpage developers get Firefox to use the windows.resize or windows.moveTo javascript functions that seem to now be passed over?

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window.resizeTo(325,700);
window.moveTo(1150,10);
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I have a site where I use window.open to create a login window with minimum chrome.
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Some conditions were added in 7.0 to avoid abuse of the resize and move functions:
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* https://bugzilla.mozilla.org/show_bug.cgi?id=565541#c24
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How to invoke object in a javascript function

hi,
i have created an object in html. i need to call a function on the click of a button. This function needs to invoke the html object.
Kindly help me if anyone knows how to do this or if there is any other method to do it.

There's no difference between functions and objects in Javascript.Can you give something like a function pointer (or object or whatsoever) to a function as an argument in Javascript then?
Rant: in C, there are real function pointers:
void qsort ( void * base, size_t num, size_t size, int ( * comparator ) ( const void *, const void * ) );In Java, we have interfaces and we can give as an argument to a method an instance of a type implemnting a given interface. Which method will be invoked depends on the tun-time type of the object, thus we have something instead of a function pointer.

When should use request scope

hi
i don't know when i should use request scope, the example is use session scope always.
Can anyone help me?
thanks!

SpiderFromMars wrote:
> What are the best practices for using the variables
scope versus using the
> request scope when assigning variables.
>
> In other words, when should I use <cfset variables.x
= 'barf'> and when
> should I use <cfset request.x = 'barf'>?
>
The variables scope is only accessible in the current
template. The
request scope is accessible in the current template and any
other
template, such as a custom tag or include file, that is used
to build
the current request.
I.E

<cfset variable.x = "foo">
<cfset request.x = "bar">
<cfoutput>#variable.x##request.x#</cfoutput>
<cf_myCustomTag>

<cfset variable.x = "bob">
<cfoutput>#variable.x##request.x#</cfoutput>

Best Practices: request scope + forward vs. session scope + redirect

Hi,
I'm wondering what everyone's opinion is on using different scopes in my situation. I have an application where users login and have a few separate items they can update via forms. My application can go one of two ways:
1) Each item that users can update has its own session object that is created and destroyed as necessary. Each session object has a bunch of get and set methods. The annoying part is creating and destroying all the different session objects, but I can redirect the user to a readable URL each time.
2) Each item uses the request scope, which means I don't have to take care of different session objects, but I have to forward the user from a servlet to a JSP file, and the URL becomes meaningless to the user (since there was no redirect).
Is one way clearly better, or more widely used?
Thanks.

Having a bookmarkable url will be a good thing in the users point of view

Variables versus Request Scope

What are the best practices for using the variables scope
versus using the request scope when assigning variables.
In other words, when should I use <cfset variables.x =
'barf'> and when should I use <cfset request.x =
'barf'>?

SpiderFromMars wrote:
> What are the best practices for using the variables
scope versus using the
> request scope when assigning variables.
>
> In other words, when should I use <cfset variables.x
= 'barf'> and when
> should I use <cfset request.x = 'barf'>?
>
The variables scope is only accessible in the current
template. The
request scope is accessible in the current template and any
other
template, such as a custom tag or include file, that is used
to build
the current request.
I.E

<cfset variable.x = "foo">
<cfset request.x = "bar">
<cfoutput>#variable.x##request.x#</cfoutput>
<cf_myCustomTag>

<cfset variable.x = "bob">
<cfoutput>#variable.x##request.x#</cfoutput>

Passing JSP into JavaScript function

I have a database table containing a date for the end of an auction, I am able to successfully take the date from the database but I am having problems passing it and casting it to a date object within a javascript function. The purpose of the function is to begin a countdown to the passed in date. Any suggestions? The countdown function i have only works with a hard coded date object.
<SCRIPT LANGUAGE="JavaScript1.2">
mDate = new Date("October 18 2004")
function countdown(){
var now=new Date()
var diff=mDate.getTime()-now.getTime()
document.bid.days.value = Math.round(diff/(24*60*60*1000))
document.bid.hours.value = Math.round(diff/(60*60*1000))
document.bid.minutes.value = Math.round(diff/(60*1000))
document.bid.seconds.value = Math.round(diff/1000)
document.bid.mseconds.value = diff
var id=setTimeout("millenium()",1)
</SCRIPT>
<body onLoad="countdown()">
<form name="bid" method="post" action="">
<p>Timeleft</p>
<TABLE BORDER=0>
<TD width="79">Days: </TD>
<TD width="81">
<INPUT TYPE="text" NAME="days" SIZE=15></TD> <TR>
<TD width="79">Hours: </TD>
<TD width="81">
<INPUT TYPE="text" NAME="hours" SIZE=15></TD> <TR>
<TD width="79">Minutes:</TD>
<TD width="81">
<INPUT TYPE="text" NAME="minutes" SIZE=15></TD> <TR>
<TD width="79">Seconds: </TD>
<TD width="81">
<INPUT TYPE="text" NAME="seconds" SIZE=15></TD> <TR>
<TD width="79">Milliseconds:</TD>
<TD width="81">
<INPUT TYPE="text" NAME="mseconds" SIZE=15></TD> <TR>
</TABLE>
</form>
I wish to pass it as follows:
<body onLoad="countdown(<%rsProduct.get........%>)"> and then cast within the function
.............................................................................JSP.....................................................................................................
<% Connection dbConn = null;
     try
          Class.forName("com.sybase.jdbc2.jdbc.SybDriver");
          dbConn = DriverManager.getConnection("jdbc:sybase:Tds:compserver:5000/syb3044","syb3044", "syb3044");
          Statement select = dbConn.createStatement();
          int ID = Integer.parseInt(request.getParameter("carId"));
          ResultSet rsProduct = select.executeQuery("SELECT * FROM car WHERE carID =" + ID);
          if(rsProduct.next()){}
<%
          rsProduct.close();
catch (SQLException sqle)
          out.println(sqle.getMessage());
catch (ClassNotFoundException cnfe)
          out.println(cnfe.getMessage());
catch (Exception e)
          out.println(e.getMessage());
finally
          try
               if(dbConn != null)
                    dbConn.close();
          catch (SQLException sqle)
               out.println(sqle.getMessage());
     }%>
PLEASE NOTE THAT I AM A SECOND YEAR COMPUTER SCIENCE STUDY!
sorry if code is messy to read.
Regards

Looks like everyone's having a countdown problem.....
The script in this thread is awefully like in this one:http://forum.java.sun.com/thread.jsp?forum=45&thread=514095&tstart=0&trange=15
Anyway, there're what you can do. Write out the Date object in JSP as a Javascript Date, two ways to achieve that:
1, mydate.getTimeStamp() is should return a long value, time in millisec, so
var mDate = new Date(<%= myDate.getTimeStamp()%>);
2. a lil messy, use DateFormatter to format the sql.Date, this gives you a Date in Strint form. Do remember the exact API for the DataFormater, but something like this.
var mDate = new Date("<%= DateFormatter.format(myDate) %>");
I'd prefer the 1st approach, why changing a Date to String then just change to Date again....Also watch out the TimeZone stuff and Daylight saving time....have fun.

Making a commandButton's action dependant on a javascript function's result

Hi guys,
I have a command button "Login". I have a managed bean "userLoginInfoBean" with session scope whose "loginToSystem" method I want to call when user clicks on Login button.
<h:commandButton id="loginButton" type="submit" value="Login" style="font-family: Verdana; font-size: 8pt" action="#{userLoginInfoBean.loginToSystem}">So far so good. Its working perfect.
Now before calling the action, I want to call a javascript function isGoAhead(). This javascript function will return true or false. Only when it returns true then I want to call the action.
How can I do it in JSF?
Thanks

I know using onclick attribute I can call my javascript function "isGoAhead()"
<h:commandButton id="loginButton" type="submit" value="Login" style="font-family: Verdana; font-size: 8pt" onclick="isGoAhead();" action="#{userLoginInfoBean.loginToSystem}">But the question is how to make sure that the commandButton's action only gets called if the return value from "isGoAhead()" is true?
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How to get detailStamp working in an af:table when using request scope ?

<af:table var="row" id="t1" value="#{listUsers.users}" summary="Userlist" binding="#{listUsers.ATable}" [...]
<af:column sortable="false" headerText="Username" id="c13" filterable="true">
<af:outputText value="#{row.username}" id="ot13"/>
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<f:facet name="detailStamp">
<af:panelFormLayout rows="4" labelWidth="33%" fieldWidth="67%" inlineStyle="width:795px" id="pfl1" labelAlignment="start" >
<af:group id="g1">
<af:panelLabelAndMessage id="plamNumber" label="Number" for="number">
<af:outputText value="#{row.address.number}" id="number"/>
</af:panelLabelAndMessage>
I feel there is nothing special with this.
But I've tested with 2 rows in my table and when I disclose rows, I get random results :
sometimes I get the details related to the row disclosed, but sometimes I get the details of the other row.
I've read several posts on the subject but none really helpful.
Another problem ; I've noticed that when I disclose or close a row, getUsers() is called, this method fetch the data from the DB, any way to prevent it ?
For the second problem, the solution I see would be to : change scope of listUsers to session instead of request, fetch from the DB only when "refresh", not when "detailStamp",
but I've no clue on how to actually do the "only when part"
Thanks in advance,
JP

Ok when I change the scope of ListUsers to session it's "ok" since I only load the list from the DB once (just like the demo that does not have this problem since the demo does not use the DB)
When I change the scope for request and that the page is refreshed then the object ListUsers is "recreated" and the data reloaded : that's the expected behavior
So I prefer to have the scope sets to request
The problem is that when a user disclose/close a detailstamp and that the scope is set to request,
then the data is reloaded from the DB
because apparently this event acts like a "refresh"
because this event (disclose/close) cause the destruction of what is in the request scope ...
That's my understanding, probably few mistakes, I'm beginning with ADF/JSF
It seems that when I load the data from the DB, it's not always in the same order, causing the problem itself probably, which is not ADF related BUT ;
what I would like to know is how to (elegantly) prevent the event of "disclose/close" to act like a "refresh" ?
Because even if I fix the "not ADF related problem" (if there is one), loading the list from the DB each time, appears really useless and the DBA won't like me !
A solution could be to leave the session scope, but then my question would be ;
*how to know I've to reload from the DB ?"
I could just "reload it on page load", seems ok to me but
I'm not sure it's the best, I would like to have your opinion, I've found this article for the "on page load" part ;
http://groundside.com/blog/DuncanMills.php?title=adf_executing_code_on_page_load&more=1&c=1&tb=1&pb=1
Thanks,
JP

Storing Objects in Request Scope

Hello,
I'm trying to pass an object in the request scope between a JSPDynPage and the associated JSP however the object is always null. If I store it in the session I am able to retrieve it.
Could anyone assist in how to do this?
My code is as follows, thanks and regards.
public class MyClass extends PageProcessorComponent {
private String redirectToPage = "";
private static final String INITAL_PAGE = "initialpage.jsp";
private static final String SECONDARY_PAGE = "secondarypage.jsp";
private static final String BEAN_ALIAS = "myBean";
public void doProcessBeforeOutput() throws PageException {
    if (redirectToPage == null || redirectToPage.equals("")) {
      this.setJspName(INITAL_PAGE);
    } else {
      this.setJspName(redirectToPage);
public void onMyButtonEvent (Event event) {
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    IPortalComponentRequest componentRequest = (IPortalComponentRequest)getRequest();
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secondarypage.jsp:
<%@ page session = "true"%>
<%@ taglib uri="tagLib" prefix="hbj" %>
<jsp:useBean id="myBean" scope="request" class="MyBeanClass " />
<hbj:content id="myContent">
<hbj:page title="myTitle">
   <hbj:form id="myForm">
     <% if (myBean != null) {
          out.println("null");
        } else {
          out.println("not null");
     %>
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</hbj:page>
</hbj:content>
output on the page is always "null" ??

Hi,
Thanks for your posts... the null logic was actually a typo.
I've solved the problem myself - basically I think the <jsp:useBean doesn't work as I expect it (that is automatically obtain the handle to the bean):
MyDynPage.java:
package com.my;
import com.sapportals.htmlb.*;
import com.sapportals.htmlb.enum.*;
import com.sapportals.htmlb.event.*;
import com.sapportals.htmlb.page.*;
import com.sapportals.portal.htmlb.page.*;
import com.sapportals.portal.prt.component.*;
public class MyDynPage extends PageProcessorComponent {
public DynPage getPage(){
    return new MyDynPageDynPage();
public static class MyDynPageDynPage extends JSPDynPage{
    public void doInitialization(){
    public void doProcessAfterInput() throws PageException {
    public void doProcessBeforeOutput() throws PageException {
          IPortalComponentRequest componentRequest = (IPortalComponentRequest)getRequest();
          componentRequest.putValue("myRequestParam", "My Request Param Value");
          MyBean myBean = new MyBean("My Bean Title Value");
          componentRequest.putValue("myBean", myBean);
         this.setJspName("myJSP.jsp");
MyBean.java:
package com.my;
import java.io.Serializable;
public class MyBean implements Serializable {
     private String txtTitle;
     //setters
     public void setTxtTitle(String txtTitle) { this.txtTitle = txtTitle; }
     //getters
     public String getTxtTitle() { return this.txtTitle; }
     public MyBean(String txtTitle) { //constructor
          this.txtTitle = txtTitle;
myJSP.jsp:
<%@ page session = "true"%>
<%@ taglib uri="tagLib" prefix="hbj" %>
<jsp:useBean id="myBean" scope="request" class="com.my.MyBean" />
<hbj:content id="myContext" >
<hbj:page title="PageTitle">
   <hbj:form id="myFormId" >
    <%
           String myRequestParam = (String)componentRequest.getValue("myRequestParam");
          out.println("myRequestParam: " + myRequestParam + "<br>");
          if (myBean == null) {
               out.println("myBean is null<br>");
          } else {
               out.println("myBean is not null<br>");
               out.println(myBean.getTxtTitle() + "<br>");
          com.my.MyBean myOtherBean = (com.my.MyBean) componentRequest.getValue("myBean");
          if (myOtherBean == null) {
               out.println("myOtherBean is null");
          } else {
               out.println("myOtherBean is not null<br>");
               out.println(myOtherBean.getTxtTitle() + "<br>");
    %>
   </hbj:form>
</hbj:page>
</hbj:content>
The output is:
myRequestParam: My Request Param Value
<b>myBean is null</b>
myOtherBean is not null
My Bean Title Value
It appears that you can save objects in the request scope however you need to manually retrieve them. I'm pretty sure that this is not the case in other J2EE servers as the <jsp:useBean tag should imply that I want the bean retrieved from the scope automatically or created if it's null.
However the use of the <jsp:useBean appears to work correctly/as expected when using the session scope.
Thanks for your assistance.
DSR

Using Javascript function to change the value of a request variable

Have a javascript function that activates onchange within a form variable. Would like the javascript function to change the value of a request variable.
The javascript function is able to obtain the current value of the request variable ( which is 0 ) however I am unsuccessful in changing the value to 1.
I have been trying to use the following:
var vchange = 'request.changes_made = 1 ;' ;
eval(vchange);
Any ideas?

If the user makes a change to the content of the form, and then attempts to leave the form, a javascript alert pops up giving the user the option of cancelling the submit, returning to the form and saving it.
If there have been no changes, then the user is free to migrate to another page.
This process is to protect users from losing valuable information but not to annoy them with "R U Sure" messages.
Knowing the status of the form content is important to the functionality of the application.
G

Using Request,response objects

these are the 2parts of my code in Dotnet,i have to convert it into java
1) request.ContentType = "application/x-www-form-urlencoded";
// Set the content length of the string being posted.
request.ContentLength = postByte.length;
2) response = (HttpWebResponse)request.GetResponse();
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i am trying the above using HttpServletRequest request,but i am not able to do
can any body suggest this
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How to use request.setAttribute in javascript function.

Here is my scenario.
I am storing all open windows handles in the array( javascript ).
I want to send this array to the servlet for which I need to do
request.setAttribute("jsArray", windowArray);
I am getting all kinds of errors while writing above statement in the javascript function.
Here is my code:
function save_javascript_array(){
<% request.setAttribute("jsArray", %> + winArray + <% ); %>
document.forms[0].action="/NASApp/inv/AuditServlet";
document.forms[0].submit();
Thanks in advance.

try something like this:
crate a JavaScript function that set a form parameter with the values contained in the array, for example make a string containing all elements of the array separated by colon (,):
function save_javascript_array()
var data;
data = '';
for( var i=0;i<winArray.length;i++ )
data = data + winArray[i] + ',';
document.forms[0].handles.value = data;
document.forms[0].action="/NASApp/inv/AuditServlet";
document.forms[0].submit();
you must have a form like this:
<form ...>
<input type="hidden" name="handles">
</form>
Now in the servlet you must retirve the parameter called "handles" and iterate over the string:
StringTokenizer tok = new StringTokenizer( request.getParameter("handles"),"," );
while( tok.hasMoreElements() )
String handle = tok.nextToken( );
// do something with this handle...
The code above may be different (I don't remember the names of the methods os StringTokenizer) and I don't known much about JavaScript (e.i. how to iterate over a array and how to concatenate each element in the array)
JaimeS

Using a request scope object in a javascript function

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