I can't find one attribute sent from a JSP form.
<form name="shuntingForm" action="/TCS_FUND/ShuntAction.aen" method="POST">
<div class="field-item clearfix">
<input type="hidden" name="csrfPreventionSalt" value="<%=CsrfPreventionSalt%>" />
<input type="hidden" name="idSession" value="<%=idSession%>">
Funds Trading<br>
</div>
</form>
request.getAttribute("idSession") & request.getParameter("idSession") show NULL.
Any ideas ? thanks
I would simplify this to return a fixed value.
Change:
<input type="hidden" name="idSession" value="<%=idSession%>">
To:
<input type="hidden" name="idSession" value="123456789">
Once that works, figure out the difference.
You also may want to view the source of the web page. If your idSession does not have the value you expect, your input tag will show the wrong value field.
Related
This question already has answers here:
How to transfer data from JSP to servlet when submitting HTML form
(4 answers)
Closed 2 years ago.
I have the code for radio buttons
<input type="radio" name="opt" id="1" value="1"/><label for="1">${dto.quesOpt1}</label>
<br/>
<input type="radio" name="opt" id="2" value="2"/><label for="2">${dto.quesOpt2}</label>
<br/>
<input type="radio" name="opt" id="3" value="3"/><label for="3">${dto.quesOpt3}</label>
<br/>
<input type="radio" name="opt" id="4" value="4"/><label for="4">${dto.quesOpt4}</label>
And I want to put the value here so I can pass it to my Servlet
<form action="MainController" method="POST">
<input type="hidden" name="quesNum" value="${requestScope.QUESNUM}"/>
<input type="hidden" name="quesId" value="${dto.quesId}"/>
<input type="hidden" name="quesChoice" value="${param.opt}"/> <--------- here
<input type="hidden" name="amount" value="${requestScope.AMOUNT}"/>
<input type="hidden" name="action" value="Previous Question"/>
<input type="submit" value="Previous" <c:if test="${requestScope.QUESNUM == 0}">disabled</c:if>/>
</form>
I always get null value in Servlet
request.getParameter("quesChoice")
I don't know how to pass the value. Please guide me. Thank you.
What you're trying to do is execute server side code (like ${dto.quesId}) inside the browser. You cannot do that.
What you're trying to do is super nasty and is probably not the right way to go. You probably don't need to copy the values from the radio to the form as you can put the radios directly inside the form.
JSPs are a super old technology that most companies have already abandoned years ago and those that still use it, plan to abandon it.
If you really have to use JSPs, your life would be much easier if you used JSTL libraries and MKYoung has some awesome tutorial on how to handle a lot of old java issues, including the one you're struggling with right now: https://mkyong.com/spring-mvc/spring-mvc-radiobutton-and-radiobuttons-example/
If you say "fuck it, I want to code it the way I was planning to do that all along anyway", you still need JavaScript to copy your values as this is the JavaScript that handles the browser-side actions.
Having said all that, this is how you can do it with pure JS:
<html>
<script>
function copyValue() {
let allOptions = Array.prototype.slice.call(document.getElementsByName('opt'));
let selectedOption = allOptions.filter(opt => opt.checked)[0];
let selectedOptionValue = selectedOption ? selectedOption.value : undefined;
document.getElementById('quesNum').value = selectedOptionValue;
}
</script>
<body>
<input type="radio" name="opt" id="1" value="1"/><label for="1">${dto.quesOpt1}</label>
<br/>
<input type="radio" name="opt" id="2" value="2"/><label for="2">${dto.quesOpt2}</label>
<br/>
<input type="radio" name="opt" id="3" value="3"/><label for="3">${dto.quesOpt3}</label>
<br/>
<input type="radio" name="opt" id="4" value="4"/><label for="4">${dto.quesOpt4}</label>
<input type="hidden" name="quesNum" id="quesNum" value="${requestScope.QUESNUM}"/>
<input type="button" value="Copy Value" onClick="copyValue()"/>
</body>
</html>
Note how I had to add the id="quesNum" and then the onClick="copyValue()" to trigger an action.
Here's the example in JSFiddle if you want to play with it: https://jsfiddle.net/kgjanowski/5ymubn6v/22/
I want to insert an Attribute into the html Code.
I tried this, but it's not working:
<div id="${var}"> ... </div>
I think you know what I mean. The attribute 'var' should be the id. I didn't find a solution...
You just need to use the th:attr attribute. It is explained in the reference documentation 5.1:
5.1 Setting the value of any attribute
Enter then the th:attr attribute, and its ability to change the value
of attributes of the tags it is set in:
<form action="subscribe.html" th:attr="action=#{/subscribe}">
<fieldset>
<input type="text" name="email" />
<input type="submit" value="Subscribe!" th:attr="value=#{subscribe.submit}"/>
</fieldset>
</form>
The
concept is quite straightforward: th:attr simply takes an expression
that assigns a value to an attribute. Having created the corresponding
controller and messages files, the result of processing this file will
be:
<form action="/gtvg/subscribe">
<fieldset>
<input type="text" name="email" />
<input type="submit" value="¡Suscríbe!"/>
</fieldset>
</form>
Use this
<div th:attr="id=${var}"> ... </div>
Thymeleaf only evaluates attributes that are prefixed with th:. Here is a list of the attributes that are evaluated:
http://www.thymeleaf.org/doc/tutorials/2.1/usingthymeleaf.html#setting-value-to-specific-attributes
In your case, th:id is already built in so you can simply do <div th:id="${var}"> ... </div> and it will work. th:attr, is used to define attributes that thymeleaf doesn't normally support.
My index.jsp is as following:
<form action="FileUploadServlet" id="formSubmit" method="post" enctype="multipart/form-data">
<input type="text" id="txtFileName" value="${fname}"/>
<input type="file" name="fileName" id="selectedFile" style="display: none;">
<input type="button" id="btnBrowse" value="Browse..." onclick="document.getElementById('selectedFile').click();" />
<input type="submit" value="Upload" id="btnUpload">
</form>
with value=${fname} is get from dopost method in servlet when form summited
request.setAttribute("fname", fileName);
getServletContext().getRequestDispatcher("/index.jsp").forward(
request, response);
But it's weird that when I deployed index.jsp
My text field always show ${fname} in text area, even after form submitted, its still get that value (correctly it must show 'filename')
Does anyone meet this problem like me?
First thing is that, you are using wrong syntax to display value in JSP.
Below syntax is wrong.
value="${fname}"
We use expression tag fordisplaying value in JSP page. Expression tag convert into Java statement.
<%=request.getAttribute("fname")%>
When you first time open your index.jsp page, it will show you blank value and when request will come back from server side, then it will show you correct result.
Use below code.
<%if(request.getAttribute("fname")!=null){%>
<input type="text" value ="<%=request.getAttribute("fname") %>"/>
<%}else
{ %>
<input type="text"/>
<%} %>
In JSP, the correct syntax to retrieve the values is
<%=request.getAttribute("fname")%>
This is known as assignment OR expression tag (<%=%>).
Try this ...
<form action="FileUploadServlet" id="formSubmit" method="post" enctype="multipart/form-data">
<input type="text" id="txtFileName" value="<%=request.getAttribute("fname")%>"/>
<input type="file" name="fileName" id="selectedFile" style="display: none;">
<input type="button" id="btnBrowse" value="Browse..." onclick="document.getElementById('selectedFile').click();" />
<input type="submit" value="Upload" id="btnUpload">
</form>
More related to this, here.
<c:forEach items="${movieList}" var="movie" varStatus="status">
<tr class="<c:if test="${status.count % 2 == 0}">even</c:if>">
<td>${movie.title}</td>
<td>${movie.genre}</td>
<td>${movie.year}</td>
<td>${movie.boxoffice}</td>
<td>
<form:form action=edit.htm>
<input type="hidden" name="edit" value="movie name">
<input type="submit" value="Edit">
</form:form>
<form:form action=delete.htm>
<input type="hidden" name="delete" value="movie name">
<input type="submit" value="Edit">
</form:form>
</tr>
</c:forEach>
This is the section of code I have at the moment. The idea is to display movie data, but also provide buttons to send the user to either a filled form page to edit the data or simply delete the respective data and redirect to the same page. I am just unsure as how to pass along the movie object. I know it is simple, but I can't find the reference I used previously...
Thanks.
U can try this :
put this object in a hidden input
<input type="hidden" id="hidden_object" value="" name="hidden_object"></input>
than you can access the value with the method getParameter()
OR
put this object in your session
in your jsp
<% session.setAttribute("movie", ${movie}); %>
good luck
in my jsp, when i navigate through tab key it skips my Save and Reset button. and move to next component in my page. even though i have not used tabindex in my jsp files. please suggest what could be the reason. thanks
code is like:
<div>
<input type="hidden" name="_flowExecutionKey" value="${flowExecutionKey}"/>
<input type="submit" class="button" name="_eventId_search" value="Search"/>
<span class="save_button_common" onClick="submitForm('save')">Save</span>
<span class="reset_button_common" onClick="submitForm('reset')">Reset</span>
</div>
May be because it is not input type , you can explicitly try setting tabIndex
Try:
<div>
<input type="hidden" name="_flowExecutionKey" value="${flowExecutionKey}"/>
<input type="submit" class="button" name="_eventId_search" value="Search"/>
<input type="button" class="save_button_common" onClick="submitForm('save')">Save</input>
<input type="button" class="reset_button_common" onClick="submitForm('reset')">Reset></input>
</div>
Note if it's a form you need input type="button" rather than just using <button> which you can otherwise just for straight links that don't submit a form. This is particularly relevant with Internet Explorer that treats the button tag somewhat differently to other browsers (submitting the "value=" rather than the enclosed text or something like that)