I am trying to call jsp code in javascript.
The error is as follow
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 16 in the jsp file: /testng_index.jsp
String cannot be resolved
13: var mai=document.getElementById("j");
14: //mai.value = mai.value.toUpperCase();
15: var m=mai.value;
16: <%=String value=document.writeln(m)%>
17: var mo= <%= new PlaneBo().getOwnerId(value)%>;
18: // document.writeln(mo);
19: if(mo==0)
here is the code
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1" import="com.ams.services.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<script type="text/javascript" language="javascript">
function emailCheck()
{
var mai=document.getElementById("j");
//mai.value = mai.value.toUpperCase();
var m=mai.value;
<%=String value=document.writeln(m)%>
var mo= <%= new PlaneBo().getOwnerId(value)%>;
// document.writeln(mo);
if(mo==0)
{
// document.writeln(m);
var tab = document.getElementById("t");
var row = tab.insertRow(3);
var cell1=row.insertCell(0);
var cell2=row.insertCell(1);
var inpt= document.createElement("input");
inpt.setAttribute("name","jho");
inpt.setAttribute("type","text");
cell1.innerHTML="Name";
Please provide me suitable solution of this problem.
It looks to me as if you have some confusion about when and where Java and JavaScript code executes.
The Java code and JSP runs on the server when the browser requests the page. The server knows nothing about HTML and JavaScript. As far as the server is concerned, this is your JSP page:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1" import="com.ams.services.*" %>
TEXT
<%=String value=document.writeln(m)%>
TEXT <%= new PlaneBo().getOwnerId(value)%>
TEXT
The server doesn't really care what's in the sections marked TEXT; it just sends them straight to the browser as they are. But it does care about what's in the <%# ... %> and <%= ... %> tags.
You get an error because the server doesn't understand document.writeln(m). It's not aware of any object named document, so it can't evaluate document.writeln(m). It happens that in JavaScript there is an object document and a function document.writeln, but that's irrelevant. The server doesn't know anything about JavaScript.
The JavaScript code doesn't execute until the page has finished being sent to the browser. You haven't shown when the function is called: it may be after an input field's value has been changed or a button has been clicked. The JavaScript runs in the browser, not on the server, so it can't directly call the Java code on the server.
If you really want to execute some Java code on the server during a call to your JavaScript function, you will need to use an AJAX call. See this question for more information on how to do this.
Related
1.How to find that your website is being hit in the next tab of the same browser?
2. How to prevent the website from being opened in the second tab?
If the browser first calls your site, you create a session on server side which results in sending the session cookie to the browser. In your HTML you can embed a hidden form value. This hidden value must be included in every subsequent call. Best is to use always POST so that the hidden value isn't included in the URL.
If the user opens a second tab and want to open a URL of your site the hidden parameter is not included but the session cookie from the first tab is.
So at server side you know there is already a session but the hidden value is missing. So you can send a totally different response.
Update
Here a small example.
In web content folder there is a subfolder protected. All included JSP files should only be opened in one tab. Here there is only MyJsp.jsp.
In the root folder there are two JSPs: error.jsp which is displayed when someone is trying to open a protected JSP in a second tab. And index.jsp which redirects to protected/MyJsp.jsp.
And there is a servlet filter mapped to the protected folder. This filter will be called before executing the JSPs in this folder.
protected/MyJsp.jsp:
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%# taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<p>Hello,
<c:choose>
<c:when test="${not empty param.name}">
<c:out value="${param.name}" />.
</c:when>
<c:otherwise>
stranger.
</c:otherwise>
</c:choose>
</p>
<form method="post">
<label>Please enter your name</label>
<input id="name" name="name" type="text"/>
<input id="marker" name="marker" type="hidden"
value="<c:out value="${sessionScope.marker}"/>"/>
<button type="submit">OK</button>
</form>
</body>
</html>
This JSP is asking for a name. Form submit calls the same JSP via POST. The hidden field is filled with a value from the session.
index.jsp:
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!--include the library-->
<%# taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:redirect url="protected/MyJsp.jsp"/>
The servlet filter:
#WebFilter("/protected/*")
public class OneTabFilter implements Filter {
private static final String MARKER_NAME = "marker";
private static final String MARKER_VALUE = "4711*0815";
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
final HttpServletRequest req = (HttpServletRequest) request;
final HttpServletResponse rsp = (HttpServletResponse) response;
HttpSession session = req.getSession(false);
if(session == null) {
session = req.getSession(true);
// Put the marker value into session so it is usable in JSP files.
session.setAttribute(MARKER_NAME, MARKER_VALUE);
// pass the request along the filter chain
chain.doFilter(request, response);
} else {
if(MARKER_VALUE.equals(req.getParameter(MARKER_NAME))) {
// pass the request along the filter chain
chain.doFilter(request, response);
} else {
// Redirect to the error page.
// The error page itself is not affected by this filter.
rsp.sendRedirect(req.getServletContext().getContextPath() + "/error.jsp");
}
}
}
// ...
}
Try it yourself!
I've been working with Struts2 and it's JQuery plugin for around a week and I'm a little bit lost.
Last thing I tried to do was to implement searches by date in a jqGrid I'm displaying on a page. For this, I followed this tutorial here.
The thing is it's not working because when I click on the searchfield which is supposed to pop out the datepicker, it won't pop out anything.
I've debugged the javascript code and found that when it tries to call the datepicker() function, an error comes up saying "Uncaught TypeError: Undefined is not a function" .
I'm not sure why this happens as I'm using Struts2-jquery-plugin 3.7.1. I'm posting my JSP code below (I've omitted all the grid rows that don't relate to the question):
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%#taglib prefix="s" uri="/struts-tags"%>
<%# taglib prefix="sj" uri="/struts-jquery-tags"%>
<%# taglib prefix="sjg" uri="/struts-jquery-grid-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<sj:head jqueryui="true" jquerytheme="south-street" locale="es" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
datePick = function(elem) {
$(elem).datepicker({
firstDay : 1
});
$('#ui-datepicker-div').css("z-index", 2000);
}
</script>
<title>Testing</title>
</head>
<body>
<s:url var="remoteurl" action="reservationList"/>
<div id="grid">
<sjg:grid
id="reservationsGrid"
caption="%{getText('reservationTable.title')}"
dataType="json"
href="%{remoteurl}"
pager="true"
gridModel="gridModel"
rowList="10,15,30"
rowNum="15"
navigator="true"
navigatorSearch="true"
autowidth="true"
navigatorSearchOptions="{multipleSearch:true, closeAfterSearch:true}">
...
<sjg:gridColumn name="date" index="date" title="Date" search="true" formatter="date" sortable="true" formatoptions="{newformat : 'd/m/Y H:i', srcformat : 'Y-m-d H:i'}" searchoptions="{sopt:['eq','lt','le','gt','ge'], dataInit:datePick}"/>
...
</sjg:grid>
</div>
</body>
</html>
Am I missing any import/reference or such a thing?
UPDATE
Recently I've found a hack, and it's telling me that the issue relates to the datepicker's import/reference:
All I did was adding a new tag inside my JSP:
<sj:datepicker style="display:none" disabled="true"></sj:datepicker>
By doing this, I guess I'm forcing the framework to automatically import and initialize a datepicker, and so it works, but it's not the solution I'm searching for.
So my question then is:
How can I import/reference and initialize the datepicker?
By default <sj:head> will NOT load all jQuery ui resources rather they are loaded on demand. When you've added a <sj:datepicker> tag it also loaded needed resources and your script was able to run.
In order to load all resources at once set loadAtOnce attribute of <sj:head> tag to true.
<sj:head jqueryui="true" loadAtOnce="true"
jquerytheme="south-street" locale="es" />
I have the following code snippet in JSP page
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%# page contentType="text/html; charset=iso-8859-1" language="java"
import="java.util.*,java.sql.*,javax.naming.*%>
<html>
<head>
......
.......
When I tried to add
<!DOCTYPE html>
to top of page, I am getting the following error
Unable to get value of the property 'value': object is null or undefined
What could be the reason for this and how to resolve this error?
Scripts block
<script>
function myFunc() {
if (prod.value.length > chars) {
prod.value = prod.value.substring(0, chars);
alert('Exceeded');
}
}
</script>
Adding <!DOCTYPE html> shifts the browser into Strict Mode, which means it has narrower tolerances for common coding errors in addition to having slightly different CSS behaviour.
It sounds like you have a <script type="text/javascript"> on your page which uses an obsoleted or deprecated technique for getting input values.
I suggest using a Script Debugger (IE, Chrome, Safari and Firefox all feature script debuggers, all accessed by pressing F12) and stepping through your scripts to find the cause of the error and then fixing it yourself.
guys, I want to pass values from one html page to another. In test1.html, submit the value to Serlvet. In servlet got the value, and dispatcher request to test2.html. like this:
request.setAttribute("url", url);
request.getRequestDispatcher("test2.html").forward(request,reponse);
So, how can i get the "url" value in test2.html?. need help, thx!
request.setAttribute("url", url);
request.getRequestDispatcher("test2.jsp").forward(request,reponse);
then test2.jsp
<%# page language="java" pageEncoding="UTF-8"%>
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
${url}
</body>
</html>
As the forward is entirely server-side, the attribute should still be present in the request. So from test2.html (actually you should make this a JSP page, test2.jsp), you can do the following:
<%
String url = (String)request.getAttribute("url");
%>
And if you wish to display it:
<html> ...
The URL is: <%=url%>
</html>
Ok its a continuation of my crap attempts of using client side scripts along with server side elements.
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form name="test" action="test.jsp" method="post" enctype="multipart/form-data">
<select name="harish" onchange=callme();>
<option value="1">1</option>
<option value="2">2</option>
</select>
<script>
var jsvar="Hello";
function callme()
{
alert(jsvar);
jsvar=document.getElementById("harish").value;
alert(jsvar);
}
</script>
<%
String s=(String)("<script>document.writeln(jsvar)</script>").toString();
out.println(s.equals("Hello"));
if(!(s.equals("Hello")))
{
String jspvar="<script>document.writeln(jsvar)</script>";
out.println("jspvar"+jspvar);
session.setAttribute("test",jspvar);
}
%>
</form>
</body>
</html>
Now what I am trying is to set the selected value as a session variable.But my bad the value from javascript is not sitting properly on the jsp/java variable and therby my condition if(!(s.equals("Hello"))) fails.Can anyone help me here...
Update:
Can the below be the solution for this question
Have a HTML page with two frames. Let the first page contain all the javascript values you wish to populate. The second page(hidden) of the frame actually does the trick. That is actually a JSP. On click of a button (on any action on the first page) in the first page, point your location to the hidden frame (2nd page), perform checks / conversions and populate the variable of the first page using cross frame JAVASCRIPT.
my condition if(!(s.equals("Hello"))) fails
That is because this:
String s=(String)("<script>document.writeln(jsvar)</script>").toString();
out.println(s.equals("Hello"));
...is pretty much the same as writing:
out.println("this".equals("that"));
It will always be false.
Now what I am trying is to set the selected value as a session variable.
To set a variable in the session, you need to POST the form to the server (ignoring AJAX techniques, etc.). As I mentioned here, using multipart/form-data requires a MIME parser - the form below uses the default enctype.
This form will, when you select an option from the drop-down, post the form to the server. Every time the JSP is run, it uses a scriptlet <% ... %> tests to see if a "harish" parameter has been posted. If it has, it places it in the session. An expression <%= ... %> is used to display the current session value.
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- header removed for clarity -->
<body>
<form id="test" name="test" action="test.jsp" method="post"><select
name="harish" onchange="document.getElementById('test').submit();">
<option value="select">select an option</option>
<option value="1">1</option>
<option value="2">2</option>
</select></form>
<%
//see if a parameter was sent from page; "harish"==name attr on select
String value = request.getParameter("harish");
if (value != null) {
//store it in session
session.setAttribute("test", value);
}
%>
<%="harish=" + session.getAttribute("test")%>
</body>
</html>
This assumes that the above page is test.jsp - that the page posts back to itself. If not, you'll need to move the scriptlet and the expression to test.jsp.
Java is evaluated on the server side, so in variable s you will always find
<script>document.writeln(jsvar)</script>
Javascript is evaluated on the opposide side, that is on the client's browser, so this is why your method does not work (I've fallen many time into this also ^^)
You can POST the form on the same jsp where this code resides and take the result from the POSTed data, to do that you'll use a scriptlet. If I remember correctly you could use
request.getParameter("PARAMETER_NAME")
So just add the name of the jsp where this code is to the action of the form and the above code to retrieve the selected value.