When submitting a form I get the message:
com.xxx.mvc.reports.ReportController: Data binding errors: 6 {||||||| - |}
The command class inherits from an abstract base class.
When using debugging I can see that the values are set on the command class. I use spring 2.5. Somehwere after the fields are set and between the calling of onSubmit in the controller the error occurs. I use a SimpelFormController. The onSubmit method isn't called so I can't inspect the BindException there.
What does this mean and how can I troubleshoot this?
I barely posted the question and I found the answer:
<form:errors path="pathName"/>
gives me the errors.
If you want to easily see every binding error related to your command bean in the page, put something like:
<spring:bind path="command.*">
<c:forEach items="${status.errorMessages}" var="error">
<font color="red">Error code: <c:out value="${error}"/></font>
<br><br>
</c:forEach>
</spring:bind>
The code is for a bean named "command", as default.
Related
I want to retrieve the http method of the spring's <form:form> tag from inside a RequestDataValueProcessor in order to generate different hidden fields depending on it. I have access to the form action, but it seems there is no way to retrieve the http method of the form.
I am using Spring 3.2.
Edit: I have added an example.
Imagine the form below being retrieved with GET. What I want is to read the method parameter of the <form:form> tag in order to add a hidden field depending on the method. Obviously, I can't use request.getMethod() because this would return the method of the original request, not the method of the form being processed by RequestDataValueProcessor.
<form:form action="/foo/bar" method="post" modelAttribute="${modelAttribute}" >
<form:input path="myField" />
<input id="proceed" type="submit" value="Save" />
</form:form>
It seems that there is a pending issue to allow access to the form method in RequestDataValueProcessor.
This is the issue: https://jira.springsource.org/browse/SPR-10041
Definitely an open issue on Spring, but doesn't look like its going to be addressed soon.
Here is what you can do.. its not straight forward though, so weigh the cost vs benefit before you start :)
RequestDataValueProcessor will not work for you, you already know that. The way the FormTag is programmed, it calls specific methods (hooks) from the value processor at specific times, during the execution of the form tag.
You can create your own custom form tag, which will do everything Spring's form tag does, either by composition or inheritence. But in addition, you can call your own Value Processor esque class when the form method is detected by the tag. This class can then decide what additional steps you want to take and you can then use the regular ValueProcessor to add hidden fields as you see fit.
These questions talk about how to extend spring's tags, by creating your own: SpringMVC Custom Form Tags and Create a custom tag library which extends the Spring tag library.
Also look at the source code of the FormTag https://github.com/SpringSource/spring-framework/blob/master/spring-webmvc/src/main/java/org/springframework/web/servlet/tags/form/FormTag.java. See how the protected processAction method calls the value processor hook, you'll have to do something similar, but in the getMethod method.
Hope this answer makes sense, let me know if you want me to re-phrase or elaborate any point.
Happy programming!
A little more information would be helpful such as what version of Spring you are using.
From the Spring 3.2 API Documentation for RequestDataValueProcessor, I see that there are four (4) methods that you could possibly be working within. In each of those, you have access to the HttpServletRequest.
Accordingly, you have access to whatever HTTP Method the inbound request was made with by calling (link):
request.getMethod()
This should give you exactly what you're looking for.
I am using tiles, Spring MVC, Spring form tag. I want to make a form that step by step. When click a button, show more inputs from another tiles definition. But throw a exception can not find "Neither BindingResult nor plain target object for bean name " , It looks the "more inputs" can not get bindle object from previous request, is it right?
Source code:
<form:form action="/saveTicker.do" commandName="ticker" modelAttribute="ticker" method="post">
...
<form:input path="name" id="name"/>
Confirm
<div class="row" id="filelist">
</div>
</form>
js
var confirmTicker=function(){
var ticker=$('input:text').val();
$.get("/confirmTicker.do",{ticker:ticker}).success(function(data){
$('#filelist').html(data);
});
}
want to import another file
<table class="table ">
<c:forEach var="f" items="${fileList}">
<tr>
<td>
<form:checkbox path="files" value="${f}"></form:checkbox>
</td>
</tr>
</c:forEach>
</table>
The error is
Neither BindingResult nor plain target object for bean name 'files' available as request attribute
If I am reading this correct, what you want is a "wizard" form where the user is passed from one form to the next as a series of steps. First, I believe Spring Web Flow does this out of the box, but, if like me, you cannot use Spring Web Flow you can do this manually.
First, you need a Form Bean (read Command object) that has all the possible inputs from all the forms.
Next, you will either have one Controller method that accepts your Form Bean and returns the proper step (this is what I did), or you can have multiple methods...it doesn't matter. You will use the #ModelAttribute annotation on the handler method to bind the Form Bean to the view form. Also, #SessionAttributes annotation at the top of the controller to set the Form Bean as a session attribute. Make sure the name of the #ModelAttribute, #SessionAttribute, and the view all correspond to the same attribute name.
Last, create multiple views, each with the same , but each with only the pieces you want to set on the FormBean at that point. You cannot use JSR 303, or at least I don't know how you can, since you can't have validation done between steps. You will have to handle validation at the end on your own.
In my MVC controller I have a handler method with a signature:
public void myAction(ActionRequest request, ActionResponse response, Model model) {...}
And in this method I check if some submitted data is okay. If it's not valid, I want to set an error. Currently I do it this simple way:
model.addAttribute("operationStatus", "error");
model.addAttribute("operationMessage", "a lot of things went wrong");
and in the view JSP:
<c:if test="${requestScope.operationStatus == 'error'}">
<div class="msg-error">${requestScope.operationMessage}</div>
</c:if>
Surely there has to be a better way to handle errors in Spring Portlet MVC. Note that I need to display the error messages in different places, not only in <form> tag.
So how should I handle errors?
If you're targeting just Liferay, then you can use the SessionErrors class so you can do the following:
SessionErrors.add(actionRequest, "some-error");
Then on your JSP you have:
<%# taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %>
<liferay-ui:error key="some-error" message="Your error message goes here!" />
You can also use do this with exceptions. Check out my answer here.
When all property validation passes but the login info passed in is incorrect, I want to display a model-level error that reads:
Incorrect login. Reset Password.
#Html.ValidationSummary() is encoding the html.
I have tried creating a custom HtmlHelper for this but it's still doing the same thing.
I've also checked the source code and the ValidationSummary method uses internal methods that I can't use to recreate a helper for this.
Is there a way, whether in my view or in a HtmlHelper, to write an Html message if there is a model-level error?
I will use TempData to solve your problem.
In your method you set the message in
TempData["Error"] = "my error link";
then from your view you check if TempData["Error"] is not empty and then with
#Html.Raw(TempData["Error"])
you should get your message not encoded
I have followed this tutorial for the most part to explain what I am doing. http://www.asp.net/data-access/tutorials/creating-a-business-logic-layer-vb
What i need to do is figure out the best way to approach to be able to update my formview. I do not understand what the tutorial is trying to explain to me so i tried it the way i have updated a gridview before. But I am receiving "No parameterless constructor defined for this object." I tried to debug and view the callstack but it does not really tell me much.
I have my sql stored procedure to update which when executed works fine.
I also have another class in which i reference the application details class
applicant.vb
This is the code in order for when you click the view details link on the gridview it passes you off to another page that shows that applicants details it is within the same applicant.vb class
I am trying to update using the following method on the .aspx page but i receive the following error "No parameterless constructor defined for this object."
Memberdetails.aspx
Without knowing which line of code is causing that error, I can't say for sure, however, my guess is that your error is on this line of code.
_applicantadapter = New applicantTableAdapter
Put an open parentheses after applicantTableAdapter to see the different constructor signatures available to you for that type. I bet you'll see none of the options allow no parameters.
That error means that the object type you are trying to instantiate requires that you include parameter(s) (and you are not).