JSP variable in javascript

Can I use a jsp variable in javascript? If so, how? It would be used in an "if" statement:
function get This() {
if (document.form.tfName.checked==true) || (<%jsp>) {
then do this...}
}

My problem is I am grabbing a persistant value from a
value object: the value of a checkbox as
<%=InformationVO.isChecked()%>If (==true) i want javascript to enable a button on
load. If not disable it. Plus I hav javascript on
the page that controls this while the page is open.
Just don't know how to incorporate the two scenarios
s for:
1.checking the value to ernable/disable the sumbit on
load with the value of the VO
2. using javascript to control the enable/disable
while page is laodedYou want something like this?
<%
boolean enableButton = InformationVO.isChecked();
%>
<html>
<head>
<script language="javascript">
// load event, enables or displables button depending on the InformationVO.isChecked value.
function doMyLoadEvent(){
     if(<%=enableButton%>){
          // enable mySubmitButton object
     }else{
          // disable mySubmitButton object
// submits the form
function submitForm(){
     var frm = document.forms[0];
     frm.action = "path to your servlet goes here";
     frm.submit();
</script>
</head>
<body onload="javascript:doMyLoadEvent()">
Woopdy doo!
<form method="post" action="" name="">
<input type="button" name="mySubmitButton" value="Submit" onclick="javascript:submitForm()">
</form>
</body>
</html>

Similar Messages

How to pass a jsp variable into javascript??

<p><%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c" %>
<p><%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<p><html>
<p><c:set var="binrmapi" value="http://localhost/paas-api/bingorooms.action;jsessionid=XXXXXX?userId=TEST2&sessionId=1&key=1" />
<p><c:import var="testbinrm" url="${fn:replace(binrmapi, 'XXXXXX', jsessionid)}"/>
<p><c:set var="tuples" value="${fn:split(testbinrm, '><')}" />
<p>Time until next game
<p><c:forEach var="tuple" items="${tuples}">
<p><c:if test="${fn:contains(tuple, 'row ')}">
<p> <p><code>
<p> <c:set var="values" value="${fn:split(tuple, '=\"')}" />
<p> <font color="blue">
<p> <c:out value="${values[17]}" />
<p><c:set var="remainingtime" value="${values[17]}" />
<p> </font>
<p> </code>
<p></c:if>
<p></c:forEach>
<p><form name="counter"><input type="text" size="8" name="d2"></form>
<p><script>
<p>var milisec=0
<p>var seconds=eval("document.myForm.remaining").value;
<p>function display(){
<p> if (milisec<=0){
<p> milisec=9
<p> seconds-=1
<p>}
<p>if (seconds<=-1){
<p> milisec=0
<p> seconds+=1
<p> }
<br>else
<p> milisec-=1
<p> document.counter.d2.value=seconds+"."+milisec
setTimeout("display()",100)
<p>}
<p>display()
<p></script>
<p></body>
<p></html>
<p>This is my code that i was working on, in the jsp part of the script, i get a api call and save a value of time in the variable remainingtime.. and in the javascript, i try to have a countdown clock counting down the remaining time.. but i guess it doesnt work.. how can i get that working? thanks alot
Message was edited by:
hamham3001
Message was edited by:
hamham3001
Message was edited by:
hamham3001
Message was edited by:
hamham3001

Re: How to pass a jsp variable into javascript??Here is the sameple one, hope it will solves your problem.
<html>
<body>
<form name=f>
<%!
String str = "A String"
%>
<script>
var avariable = <%=str%>
<script>
</form>
</body>
</html>
Let me know if you face any problem

Passing jsp variable into javascript.....

Hai friends,
Look this code.....
var mywindow= window.open( ......)
mywindow.<%= loc%>.style.visibility = "hidden";
loc is my jsp variable passing dyanamically to the script....
But it is not taking....
when i assign jsp var into javascript like
mywindow.somehardcodedvalue.style.visibility = <%= loc%>;
it is working fine ....
pl reply me.......

Hi,
It is not working.My code is like....
String loc=(String)arrStr;
%>
<script language="JavaScript" type="text/JavaScript">
mywindow.<%= loc%>.style.visibility = "hidden";
</script>
<%

Parsing JSP variable into JavaScript

Hi,
I am trying to parse a JSP variable into a pice of JavaScript code:
<%
some jsp code .....
String table_name=cols[0].toString();
%>
<script language="javascript">
var jsTemp = <%=table_name%>
alert ('jsTemp')
</script>
<%some more JSP....
This does not create an alert, any ideas why? Am I missing a quote/semi-colon somewhere?

Sure this is being executed,
when trying to run, this does not work:
String table="TEST";%>
<script language="javascript">var jsTemp = <%=table%> alert ('jsTemp');</script>
<%more JSP...
when trying to similarly run, I get the popup 'HELLO':
String table="TEST"; //not used anymore%>
<script language="javascript">var jsTemp = "HELLO"; alert ('jsTemp');</script>
<%more JSP...
Is there supposed to be a semi-colon after <%=table%> ? Or is there another issue with this bit of code?

Set jsp variable in javascript

I have a simple question.
I have a section in jsp as below
<%!
String initial = "true";
%>
Can I set the "initial" parameter in javascript function in the same jsp like below?
function init() {
<%! initial = "true"; %>
If not, would you please give me the syntax to do it?
Thanks in advance,
Mustafa

the jsp scriptlet code, everything in between your <% ... %> marks, is compiled on the server.
the javascript code is run on the client.
therefore, you can NOT edit the scriptlet code from javascript. it cannot be done.
you CAN however edit your javascript code with the jsp scriplet. see the below example, which shows me setting a javascript variable based on some scriplet code...
<% String name = "Joe Schmoe"; %>
<script>
function doSomething() {
var something = '<%= name %>';
</script>
When that page is rendered it will look like this...
<script>
function doSomething() {
var something = 'Joe Schmoe';
</script>

Jsp variables to javascript array, for loop dont work.

This works fine. con.getmake passes a different variable each time to the javascript array using a manual index.
<script>
make[0] = "<%= con.getmake() %>" ;
document.write(make[0]);
make[1] = "<%= con.getmake() %>" ;
document.write(make[1]);
make[2] = "<%= con.getmake() %>" ;
document.write(make[2]);
make[3] = "<%= con.getmake() %>" ;
document.write(make[3]);
</script>
If I try and do the same with a for loop, It seems as though all the elements hold the same first variable retrieved from con.getmake, I am not getting the next variable from my java class.
<script>
for (var i= 0; i <= 2; i++)
make[i] = "<%= con.getmake() %>" ;
document.write(make);
</script>

Hi,
Java is parsed once on the server which creates a HTML page, then it is passed to the client's browser where the javascript is executed. So con.getmake() is only executed once in java. You've got to execute your loop in java not javascript :
<script>
<%
for (int i= 0; i <= 2; i++)
%>
document.write("<%= con.getmake() %>");
<%
%>
</script>

Assigning a javascript value to a JSP variable

How do i assign a javascript value to a JSP variable?
eg
<%
String JSPvar;
%>
<script language="JavaScript1.2">

</script>
<%
JSPvar = javascriptVar ???
%>

You do know that the JSP runs on the server and generates HTML, including Javascript, that is executed on the client, don't you?

Help: How to assign dynamically a javascript variable to a jsp variable???

Hello all,
What I need to do is to assign the value of the html form element which is a checkbox in this case:
<input name="ADB02_checkbox" type=checkbox id="ADB02_checkbox" onClick="decide_enable_or_disable_particular_checkbox()" value="ADB02">
to a jsp variable :
<%
String riderCode = "";
%>
Its dynamic because i need to do different operations based on different rider codes like in this function:
function decide_enable_or_disable_particular_checkbox() {
var rider = document.rider_form;
alert(rider.ADB02_checkbox.value);
if (rider.<%= riderCode%>_checkbox.checked == true) {
enable_all_row_elements_for_<%= riderCode%>();
else {
     disable_all_row_elements();
which uses the naming of the rider code to call other corresponding functions.
so is there any way that you guys ca suggest a solution.
what i thought is to do this:
function decide_enable_or_disable_particular_checkbox() {
var rider = document.rider_form;
HERE--> riderCode = rider.ADB02_checkbox.value;
alert(rider.ADB02_checkbox.value);
if (rider.<%= riderCode%>_checkbox.checked == true) {
enable_all_row_elements_for_<%= riderCode%>();
else {
     disable_all_row_elements();
or
add an onFocus="riderCode = document.rider_form.ADB02_checkbox.value;" in the checkbox tag.
but can i do that or is there any other way or is it totally impossible to assign javascript values to jsp variables.

Hi again,
I got a problem here abt looping in javascript.
The prob is that only the 1st loop works the rest are not.
So only the checkbox in the 1st row is enabled, the rest aren't.(only ADB02 is enabled not DLP01 cause ADB02 is 1st in the loop)
Here are 2 of many of the checkboxes in different rows:
<input name="ADB02_checkbox" type="checkbox" id="ADB02_checkbox" value="checkbox" onClick="val_checkbox()" disabled=true>
<input name="DLP01_checkbox" type="checkbox" id="DLP01_checkbox" value="checkbox" onClick="val_checkbox()" disabled=true>
This is declared in jsp:
<%
//to be used with javascript function prepare_elements() for checking to enable/disable checkbox , to check age base and limit of insured
String[][] riderCheckArray = {
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_ACCIDENTAL_DEATH_BENEFIT, "20", "60"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_LIFELINE_BENEFIT, "20", "50"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_MEDICASH_100_PLAN, "0", "55"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_MEDICASH_200_PLAN, "0", "55"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_MEDICASH_300_PLAN, "0", "55"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_MANUTERM_REDUCING_TERM_ASSURANCE_PLAN, "16", "65"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_PERSONAL_ACCIDENT_BENEFIT, "20", "65"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_15_YEAR_LEVEL_AND_CONVERTIBLE_MANUTERM_RIDER, "16", "55"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_20_YEAR_LEVEL_AND_CONVERTIBLE_MANUTERM_RIDER, "16", "50"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_5_YEAR_RENEWABLE_AND_CONVERTIBLE_MANUTERM_RIDER, "16", "60"},
{allPlans.PLAN_HER_MY_FUTURE, allRiders.RIDER_10_YEAR_RENEWABLE_AND_CONVERTIBLE_MANUTERM_RIDER, "16", "60"},
%>
Here's the script (the riderCheckArray[any no.] should be eg: riderCheckArray[0] (has an i in front))
<script>

function prepare_elements() {
var rider = document.rider_form;

for (i=0 ; i < <%= riderCheckArray.length%> ; i++) {
if ("<%= txtPlanCode%>" == "<%= riderCheckArray[i][0]%>" ) {
riderCode = "<%= riderCheckArray[i][1]%>";
if (<%= insuredAge.intValue()%> < <%= Integer.parseInt(riderCheckArray[i][2])%> ||
<%= insuredAge.intValue()%> > <%= Integer.parseInt(riderCheckArray[i][3])%>) {
disable_particular_checkbox();
alert("This rider cannot be attached. This rider can only be attached for age range " +
<%= riderCheckArray[i][2]%> +
" to " +
<%= riderCheckArray[i][3]%>);
else {
enable_particular_checkbox();

function enable_particular_checkbox() {
var Rdr_Checkbox = riderCode + "_checkbox";
var rider = document.rider_form;
rider.all(Rdr_Checkbox).disabled = false;
rider.all(Rdr_Checkbox).style.background ="FFFFFF";
function disable_particular_checkbox() {
var Rdr_Checkbox = riderCode + "_checkbox";
var rider = document.rider_form;
rider.all(Rdr_Checkbox).disabled = true;
rider.all(Rdr_Checkbox).style.background ="CCCCCC";
</script>

How to assign a JSP variabl's value to a JavaScript variable?

Hello,
I want to assign a JSP variable's value to JAVASCRIPT variable.
or how to assign JavaScript variable's value to JSP varialbe
HOw do i do it ?
can anyone please help?
Regards and thanks for your time.
Ashvini

I want to assign a JSP variable's value to
JAVASCRIPT variable.
var jsVariable = <%=someVariable%>;
or how to assign JavaScript variable's value to JSP
varialbeYou can't. JSP is server-side and JavaScript is client-side. The JSP variables are never available on the client side for any sort of assignment.

How to get javascript variable in jsp variable

Hi all,
i have a variable str in my javascript function
var str = somevaluei want this str value in jsp variable in the same page...
how can this be done..???
any ideas...
Thanks

I dont know if its possible or not.
Actually it depends on what do you want to do with the variable.
as far as assisginng value to the hidden variable is concerned it can be done this way.
<% jsp code
String hiddenVar = "";
%>
< html code
<input type type = "hidden" name="hidden" vale="<%=hiddenVar %>"
html ends>
while in js function you can assign vale to the hidden variable which will ultimately assign value to the JSP variable as follows.
var str = "value";
document.form_name.hidden_field_name.value = str.
hope this hepls.

Passing a variable from Javascript to java variable in a JSP.

Here is simple test Ive been messing around with.
How do I assign the value that was selected in the radio button to a java variable in my JSP here. Javascript being client side and JSPs being serverside makes this difficult.
<html>
<head>
<SCRIPT LANGUAGE="JavaScript">
function valbutton(thisform)
     myOption = -1;
     for (i=0; i<thisform.myradiobutton.length; i++)
          if (thisform.myradiobutton.checked)
               myOption = i;
     if (myOption == -1)
          alert("You must select a radio button");
          return false;
     alert("You selected button number " + myOption + " which has a value of " + thisform.myradiobutton[myOption].value);
     thisform.submit();
</SCRIPT>
<title>CreateCategoryContent</title>
</head>
<body>
<BR>
<center>
<%
     for(int i = 0; i < 10; i++)
%>
<form name="myform">
<table border="1" bordercolor="#C0C0C0" width="50%" cellpadding="0" cellspacing="0" bgcolor="white">
     <tr>
     <td><%=i%><input type="radio" VALUE="<%=i%>" name="myradiobutton"></td>
     </tr>
<%
%>
</form>
<input type="submit" name="submitit" onclick="valbutton(myform);return false;" value="Validate" />
</table>
</center>

</body>
</html>
Thanks dudes.

Please excuse me for appearing dim but my JSP skills are rather weak.
I dynamically create rows in a table from an Iterator. If the mainTopic is news then I need a third column to appear with radio buttons. I have all this done. When a radio button is selected and the UPLOAD button is selected I need to know which of the values in the table was selected.
When I ran the test below the selected value was null. Can you help me?
Thanks.
<%@ page session="false" %>
// imports etc
<%@ page errorPage="../com/digisoft/common/Error.jsp" %>
<html>
<head>
<SCRIPT LANGUAGE="JavaScript">
function valbutton(thisform)
     myOption = -1;
     for (i=0; i<thisform.myradiobutton.length; i++)
          if (thisform.myradiobutton.checked)
               myOption = i;
     if (myOption == -1)
          alert("You must select a radio button");
          return false;
     alert("You selected button number " + myOption + " which has a value of " + thisform.myradiobutton[myOption].value);
thisform.selected.value=thisform.myradiobutton[myOption].value;
     thisform.submit();
</SCRIPT>
<title>CreateCategoryContent</title>
<LINK REL="stylesheet" HREF="<%=request.getContextPath() + "/stylesheets/digihostnews.css"%>" TYPE="text/css">
<%
HttpSession session = request.getSession(false);
String mainTopic = request.getParameter("mainTopic");
String subCategory = request.getParameter("subCategory");
String subCategoryId = request.getParameter("subCategoryId");
String subCategoryToBeDeleted = request.getParameter("subCategoryToBeDeleted");
String selection = request.getParameter("selection");
// other initializations etc
%>
</head>
<body>
<BR>

<center>
<table border="1" bordercolor="#C0C0C0" width="90%" cellpadding="0" cellspacing="0" bgcolor="white">
     <tr>
          <td class="blue">Select Topic</td>
     </tr>
     <tr>
     <td class="insidebox2">
     <BR>
          <form action="NewsUpdate.jsp" method=post>
          Select Topic
          <select NAME="mainTopic" class="dropdown">
          <%
               Iterator menuItems = myLombardiaMgr.getMainCategories();
               while(menuItems.hasNext())
                    MainCategory aMenuItemCategory = (MainCategory)menuItems.next();
                    String menuItem = aMenuItemCategory.getMainCategory();
                    if(!menuItem.equalsIgnoreCase(mainTopic))
          %>
                    <option VALUE="<%= menuItem %>" ><%= menuItem %></option>
          <%
                    else
          %>
                    <option SELECTED VALUE="<%= menuItem %>" ><%= menuItem %></option>
          <%
          %>
     </select>
     <INPUT type=submit class="newsbutton" value="LOAD" name=Submit>
</form>
<form action="AddCategoryDescription.jsp" method=post>
<INPUT TYPE=HIDDEN NAME="mainTopic" VALUE="<%=mainTopic%>">
<INPUT type=submit class="newsbuttonlong" value="EDIT DESCRIPTION" name=Submit>
</form>
</td>
</tr>
</table>
</center>


<center>
<table border="1" bordercolor="#C0C0C0" width="90%" cellpadding="0" cellspacing="0" bgcolor="white">
     <tr><td class="blue">Categories</td></tr>
     <tr>
          <td class="insidebox2">
          <BR>
          <form action="NewsUpdate.jsp" method=post>
               Add Category
               <input type="text" name="subCategory" class="dropdown" id="catId" value=""/>
               <INPUT TYPE=HIDDEN NAME="mainTopic" VALUE="<%=mainTopic%>">
               <%
               if (mainTopic != null)
                    %>
                    <INPUT type=submit class="newsbutton" value="ADD" name=Submit>
               <%
               else
          %>
               <INPUT type=submit class="newsbutton" value="ADD" name=Submit disabled>
               <%
               %>
          </form>
               
     <table id="categoryTable" border="1" bordercolor="#035C98" width="60%" height="60%" cellpadding="0" cellspacing="0" bgcolor="white">
     <tr>
     <td colspan="1" class="result"><b>Category Name</b></td>
     <td colspan="1" class="result"><b></b></td>
     </tr>
<%
          if(myApplicationDetails != null)
               myApplicationDetails = myLombardiaMgr.getAllApplicationDetails();
               Iterator myMainCategories = myApplicationDetails.getMainCategories();
          while(myMainCategories.hasNext())
               MainCategory aMainCategory = (MainCategory) myMainCategories.next();
               if(aMainCategory.getMainCategory().equalsIgnoreCase(mainTopic))
                    Iterator subTopics = aMainCategory.getSubTopics();
                    while(subTopics.hasNext())
                         SubTopic aSubTopic = (SubTopic) subTopics.next();
               %>
                    <form action="NewsUpdate.jsp" method=post>
                         <tr>
                         <td class="result"><%=aSubTopic%></td>
                         <td class="result">
                              <INPUT type=submit class="newsbutton" value="REMOVE" name=Submit>
                              <INPUT TYPE=HIDDEN NAME="subCategoryId" VALUE="<%=aSubTopic.getId()%>">
                              <INPUT TYPE=HIDDEN NAME="subCategoryToBeDeleted" VALUE="<%=aSubTopic%>">
                              <INPUT TYPE=HIDDEN NAME="mainTopic" VALUE="<%=mainTopic%>">
                              <INPUT TYPE=HIDDEN NAME="subCategory" VALUE="<%=aSubTopic%>">
                         </form>
                    <form action="EditStoryItem.jsp" method=post>
                         <INPUT TYPE=HIDDEN NAME="subCategory" VALUE="<%=aSubTopic%>">
                              <INPUT TYPE=HIDDEN NAME="subCategoryId" VALUE="<%=aSubTopic.getId()%>">
                              <INPUT TYPE=HIDDEN NAME="mainTopic" VALUE="<%=mainTopic%>">
                              <INPUT type=submit class="newsbutton" value="EDIT" name=Submit>
                         </form>
                         <%
                              if(mainTopic.equalsIgnoreCase("News"))
                         %>
                              <td class="result">
                                   <INPUT type="radio" name="newsitem" VALUE="<%=aSubTopic%>" >
                                   <INPUT TYPE=HIDDEN onclick="valbutton(myform);return false;" NAME="selection" >
                              </td>
                         <%
                         %>
               </td>
                         </DL>
                              </tr>
                    <%
                         } // end of if
                    %>
     </table>
     <table border="0" bordercolor="#C0C0C0" width="60%" cellpadding="0" cellspacing="0" bgcolor="white">
     <tr><td align="right">
     <form action="../../../../../../servlet/UploadXmlFiles" method=post>
     <% if(myApplicationDetails == null )
     System.out.println("******************* selection "+selection);
%>
          <INPUT type=submit class="newsbutton" value="UPLOAD" name=Submit disabled>
<%
     else
%>
<INPUT type=submit class="newsbutton" value="UPLOAD" name=Submit>
<%
     System.out.println("******************* selection "+selection);
%>
     </form>
     </td>
     </tr>
     </table>
     
     </td>
     </tr>
</table>
</center>

</body>
</html>

How can I access JSP variables from a JavaScript function in a JSP page?

Respected sir
How can I access JSP variables from a JavaScript function in a JSP page?
Thanx

You may be get some help from the code below.
<%
    String str="str";
%>
<script>
    function accessVar(){
       var varStr='<%=str%>';
       alert(varStr);// here will diplay 'str'
</script>

How can we use java variable in javascript code on JSP page?

How can we use java variable in javascript code on JSP page?
Pls help

Think about it:
JSP/Java is executed on the Server and produces HTML+JavaScript.
Then that HTML+JavaScript is transfered to the client. The client now interpretes the HTML+JavaScript.
Obviously there's no way to access a Java variable directly from JavaScript.
What you can do, however, is write out some JavaScript that creates a JavaScript variable containing the value of your Java variable.

I want to assign the value of a Javascript variable to JSP Variable

I want to assign the value of a Javascript variable to JSP Variable .. for example :
<%
Bla Bla Bla
%>
<script>
var JavaScriptVariable="hello"
</script>
<%
String JSPVariable=// The Value of JavaScriptVariable ;
%>
How can i do that ??
Thanks

>I want to assign the value of a Javascript variable to JSP Variable
cannot be done.Friend try to understand concepts properly Javascript is always excuted by the browser @clientside where as JSPCode is executed Websever(ServletContainer) @serverside.Through you are combining JSP Code blocks(Tags,Expressions,scriptlets...) & javascript under a single page webserver can only identify what is their under JSP Code blocks.
Hope this could be an appropriate answer for your question.
However,you can as well submit a request by encoding your URL with request parameters and the submit to the page and then collect it using request.getParameter(name).
But under a single context state it is not possible
REGARDS,
RaHuL

Passing JavaScript values to JSP variables

Can any body correct the follwing code
<Script language="JavaScript">
function test( x )
<%
int num = x;
num = num * 2;
%>
v.value = "<%out.print(num);%>";
<input type="button" name="b" value="test" onClick="test(5)">
<input type="text" name="v" value="0">
In short, I am trying to pass JavaScript value to JSP variable. I hope that it is possible to do that. If it is possible then how can I do it. I want to assing the variable x passed to the JavaScript function called test to the JSP variable called num.
Regards,
Ageel

Thank you for your reply,,,
I think then the only way to do it is to post the
value on the server and then use request.getParameter
method in jsp code
but the question now how can I post values to the
server using JavaScript without reloading the pageyes... you can to it by create a new popup window which will submit the value to server after page was loaded... then, server return a value to the same window in html/jsp page which then using javascript to set it back to the opener and close up the window... however, this is not a good choice unless you have no other alternative...
>
There is other possible solution
if I can get the text field value from the same page
without reloading it that would work fine and will
solve my problem, is it possible?yes... you can get the value from the textfield...
for example :
function showValueInTextField()
alert(document.forms[0].elements["mytextfieldname"].value);
>
My final question> can jsp change things on the same
page without reloading it. I mean can it work like
JavaScript so that I can use it's internal functions
instead of using java script :S
not really know what you trying to say here...

JSP variable in javascript

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