java - Dynamic form and data binding with Spring MVC -


In my Spring MVC application I need to implement the form of a dynamic questionnaire: I have questions and I have 3 options for each I

Then in my page I will have something like this: 

  | Question 1 | 1 | 2 | 3 | | Question 2 | 1 | 2 | 3 | | Question 3 | 1 | 2 | 3 | | ... | 1 | 2 | 3 | | Question N | 1 | 2 | 3 |   
 The questions are stored in the database and for the option I will use the radio button. I use a  forEach  tag to prepare dynamic rows , But I do not know how to post data in this scenario and how to force  ModelAttribute  ...  
 which may be a good structure for my model specialty class ? Is it possible to use binding for a dynamic form with Spring MVC?  
 
 
 
 How to post data    < P> You can do this,  
 I am considering classes like  question :  
  public class questions {Private string question; Private map & lt; Integer, option & gt; OptionMap; Private integer selected optic; // getters and setters} like   
 and  options  class:  
  public class options {personal integer option; Private string option text; // getters and setters}   
 and for binding in the form of a  question model  class:  
  public class question model {personal Maps & lt; Integer, question & gt; QuestionMap; // getters and setters}   
 and in the Controller class  GET  handler method, for example, populate queries:  
  @RequestMapping (Method = RequestMethod.GET) Public string index (model model) {option option A = new option (1, "A"); Option Option B = New Option (2, "B"); Option option c = new option (3, "c"); Maps & lt; Integer, option & gt; OptionMap = new hashmap & lt; Integer, option & gt; (); OptionMap.put (optionA.getOptionKey (), optiona); OptionMap.put (optionB.getOptionKey (), optionB); OptionMap.put (optionC.getOptionKey (), optionC); Question Question1 = New Question ("AQ", OptionMap, 1); Question Question2 = New Question ("BQ", OptionMap, 1); Question Question 3 = New Question ("CQ", OptionMap, 1); Maps & lt; Integer, question & gt; Questionmap = new Hashmap & lt; Integer, question & gt; (); QuestionMap.put (1, question 1); QuestionMap.put (2, question 2); QuestionMap.put (3, question 3); Model.addAttribute ("QuoteModel", New QuestionModel (Quiz)); Return "index";   
 Finally jsp page usage  & lt; Form: hidden ..  and to present the form elements to keep the old values ​​such as:  
  & lt; C: url value = "/ post posted" var = "postUrl" /> & Lt; Form: Form Action = "$ {postUrl}" modelAttubil = "questionmodel" method = "post" & gt; & Lt; Table & gt; & Lt; TR & gt; & Lt; Th & gt; Question & lt; / Th & gt; & Lt; Th & gt; Option & lt; / Th & gt; & Lt; / TR & gt; & Lt; C: forEach item = "$ {questionsModel.questionMap}" var = "currQue" varStatus = "queIndex" & gt; & Lt; TR & gt; & Lt; TD & gt; & Lt; Form: hidden path = "questionmap [$ {queIndex.count}]. Question" /> & Lt; Label & gt; Question: & lt; / Labels & gt; & Lt; C: out value = "$ {currQue.value.question}" /> gt; & Lt; Br / & gt; & Lt; / TD & gt; & Lt; TD & gt; & Lt; C: forEach item = "$ {currQue.value.optionMap}" var = "opt" varStatus = "optionIndex" & gt; & Lt; Form: hidden path = "questionmap [$ {queIndex.count}]. Optionmap [$ {optionIndex.count}]. OptionText" /> & Lt; Appearance: Hidden path = "questionmap [$ {queIndex.count}]. Optionmap [$ {optionIndex.count}]. OptionKey" /> & Lt; Form: radiobutton path = "question map [$ {queIndex.count}]. SelectedOptionKey" value = "$ {opt.value.optionKey}" label = "$ {opt.value.optionText}" /> & Lt; / C: foreach & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt; / C: foreach & gt; & Lt; / Table & gt; & Lt; Input type = "submit" / & gt; & Lt; / Form: Form & gt;   
 You can get binding and model like POST:  
  @RequestMapping (value = "/ questionPost", method = RequestMethod.POST) public String indices (@model attribute ("questionmodel") questionmodel questionmodel, binding result result) {System.out.println (questionmodel.graph quiz ()); Return "Redirect: /"; }

Comments

Post a Comment

Popular posts from this blog

Java - Error: no suitable method found for add(int, java.lang.String) -

I'm in the middle of homework work and I'm stuck. At this point in my code, I think that I should have a GUI window that opens and allows me to type "inserted text number". Notice is not going anywhere but at this point, If I pass through the problem then it will be in a linked list. I am getting two of the same error for the lines. Add (index, element); And I can not seem to get past it, there is no suitable method for the error "add (int, java. string string)". Code is below, please advise. To clarify - this will not be a method error because it is a linked list. There should not be any way involved. import java.awt. *; Import java.awt.event. *; Import javax.swing. *; Import java.util. *; Import java.util.Scanner; Import java.util.LinkedList; Public class TopTenList JFrame {Private TopTenList tt; See the Private JTextArea list; Private JTextField cmdTextField; Private JTextField resultsTestfield; // This GUI window is the code for the public toptist...
Read more

java - JPA TypedQuery: Parameter value element did not match expected type -

I am using JPA 2.0 and getting the following code in the DAO layer: Public Zero Test () {string key = "status"; String [] Conditions = {"A", "B"}; & Lt; TestTable & gt; Results = Search (Keys, Conditions); } Public listing & lt; TestTable & gt; Search (string key, object value error) {string sql = "test ndf to testlet and jade nand." + Key + "in:" + key; TypedQuery & LT; TestTable & gt; Query = entityManager.createQuery (SQL, TestTable.class); Query.setParameter (key, Arrays.asList (valueArr)) / *** Error Line *** Return query.getResultList (); } In the above error line, it throws the following exception: java.lang.IllegalArgumentException: parameter value element [[Ljava.lang.String; @ cbe5bc] did not match the expected type [java.lang.String] Why is this expected type string while actually this string []? Please help! Note: This is derived from the normal routine and is a simplified code. I can no...
Read more

c++ - static template member variable has internal linkage but is not defined -

Yes, I know, there is a question with almost the same title, but it refers to a different situation. Error message) In my case, I have a .cpp file with a big named designation name (implementation details). There is a property class template with a static data member in that name space, which I need to access from outside the unknown namespace. I give it a little bit of meat: file.hpp namespace Bar {template & lt; Typename A & gt; Struct foo {static_assert (is_same & lt; a, float & gt; :: value} is_same & lt; a, double>: value, ""); Fixed zero set_static_var (a const & x); // ...}; } and file.cpp namespace {template & lt; Typename A & gt; Struct foo_traits {// supports the implementation of several static code bars: foo & lt; & Gt; Fixed A data; }; The template's & lt; & Gt; Float foo_traits & lt; Float & gt; :: datum; // No change if this is in the global namespace template & lt; & Gt; Doub...
Read more