如何在gwt-bootstrap3中添加表单元素

Question

I am trying to add some elements in gwt-bootstrap3 modal [link] , I am using UI-binder to generate the screen but nothing is appear.

my ui binder class

<?xml version="1.0" encoding="UTF-8"?>
<ui:UiBinder xmlns:ui='urn:ui:com.google.gwt.uibinder' xmlns:g='urn:import:com.google.gwt.user.client.ui' xmlns:b='urn:import:org.gwtbootstrap3.client.ui'
xmlns:res="urn:with:com.db.cary.client.resources.CSSResources">
   <ui:with type="com.db.cary.client.resources.CSSResources" field="res">
   </ui:with>
   <b:Modal closable="true" fade="true" dataBackdrop="TRUE" dataKeyboard="true">
       <b:ModalBody>
           <b:Form type="HORIZONTAL">
               <b:FieldSet>
                   <b:Legend>Please enter the book detail</b:Legend>

                   <b:FormGroup>
                       <b:FormLabel for="bookTitle" addStyleNames="col-lg-2">Title</b:FormLabel>
                       <g:FlowPanel addStyleNames="col-lg-10">
                           <b:TextBox placeholder="Enter book Title" ui:field="titleTextBox" />
                       </g:FlowPanel>
                   </b:FormGroup>

                   <b:FormGroup>
                       <b:FormLabel for="bookAuthor" addStyleNames="col-lg-2">Author</b:FormLabel>
                       <g:FlowPanel addStyleNames="col-lg-10">
                           <b:ListBox ui:field="authorListBox" />
                           <b:Button ui:field="newAuthorButton" type="LINK" size="EXTRA_SMALL">New author</b:Button>
                       </g:FlowPanel>
                       <g:FlowPanel addStyleNames="col-lg-offset-2 col-lg-10">
                           <b:TextBox ui:field="authorTextBox" placeholder="enter slash (/) separated list of authors"></b:TextBox>
                       </g:FlowPanel>
                   </b:FormGroup>

                   <b:FormGroup>
                       <b:FormLabel for="bookCategory" addStyleNames="col-lg-2">Category</b:FormLabel>
                       <g:FlowPanel addStyleNames="col-lg-10">
                           <b:ListBox ui:field="categoryListBox" />
                           <b:Button ui:field="newCategoryButton" type="LINK" size="EXTRA_SMALL">New Category</b:Button>
                       </g:FlowPanel>
                       <g:FlowPanel addStyleNames="col-lg-offset-2 col-lg-10">
                           <b:TextBox ui:field="categoryTextBox" placeholder="enter category"></b:TextBox>
                       </g:FlowPanel>
                   </b:FormGroup>
               </b:FieldSet>
           </b:Form>
       </b:ModalBody>
       <b:ModalFooter>
           <b:Button type="PRIMARY" ui:field='submitButton'>Submit</b:Button>
           <b:Button ui:field='cancelButton'>Cancel</b:Button>
       </b:ModalFooter>
   </b:Modal>
</ui:UiBinder>

and my view class

public class AddBook extends Modal {

   interface CheckOutPopUpBinder extends UiBinder<Widget, AddBook> {
   }

   private static final CheckOutPopUpBinder binder = GWT.create(CheckOutPopUpBinder.class);
   private final AuthorAndCategoryServiceAsync authorService = GWT.create(AuthorAndCategoryService.class);
   private final LibraryServiceAsync libraryServiceAsync = GWT.create(LibraryService.class);

   @UiField
   TextBox titleTextBox;
   @UiField
   ListBox authorListBox;
   @UiField
   TextBox authorTextBox;
   @UiField
   ListBox categoryListBox;
   @UiField
   Button submitButton;
   @UiField
   Button cancelButton;

   @UiField
   Button newAuthorButton;
   @UiField
   Button newCategoryButton;
   @UiField
   TextBox categoryTextBox;

   public AddBook(String title) {
      binder.createAndBindUi(this);
      setTitle(title);
      initializeAuthorListBox();
      initializeCategoryListBox();
   }

   private void initializeCategoryListBox() {
      authorService.getCategories(null, new AsyncCallback<List<CategoryDTO>>() {

     @Override
     public void onFailure(Throwable arg0) {
        Window.alert("unable to fetch category list");
     }

     @Override
     public void onSuccess(List<CategoryDTO> arg0) {
        for (CategoryDTO category : arg0)
           categoryListBox.addItem(category.getCategoryName());
     }
      });
      categoryListBox.setMultipleSelect(false);
      categoryTextBox.setVisible(false);

   }

   private void initializeAuthorListBox() {
      authorService.getAuthors(null, new AsyncCallback<List<AuthorDTO>>() {
     @Override
     public void onSuccess(List<AuthorDTO> arg0) {
        for (AuthorDTO author : arg0) {
           authorListBox.addItem(author.getAuthorName());
        }
     }

     @Override
     public void onFailure(Throwable arg0) {
        Window.alert("Unable to fetch the list of authors");
     }
      });
      authorListBox.setMultipleSelect(true);
      authorTextBox.setVisible(false);
   }

   @UiHandler("cancelButton")
   public void cancelAction(ClickEvent e) {
      AddBook.this.hide();
   }

   @UiHandler("submitButton")
   public void submitAction(ClickEvent e) {
      AddBookDTO bookDTO = new AddBookDTO();
      String bookTitle = titleTextBox.getText();
      String bookCategory = categoryListBox.getSelectedValue() == null ? categoryTextBox.getText() : categoryListBox.getSelectedValue();
      List<String> authorsList = new ArrayList<String>();

      for (int i = 0; i < authorListBox.getItemCount(); i++) {
     if (authorListBox.isItemSelected(i)) {
        authorsList.add(authorListBox.getItemText(i));
     }
      }

      if (null != authorTextBox.getText() && authorTextBox.getText().trim().length() > 0) {
     String[] values = authorTextBox.getText().split("/");
     for (String str : values) {
        authorsList.add(str);
     }
      }
      if (bookTitle == null || bookTitle.length() <= 0) {
     Window.alert("Please enter a valid book title");
     return;
      } else if (bookCategory == null || bookCategory.length() <= 0) {
     Window.alert("Please enter a valid book category");
     return;
      } else if (authorsList == null || authorsList.size() == 0) {
     Window.alert("Please enter valid authors");
     return;
      }
      bookDTO.setBookTitle(bookTitle);
      bookDTO.setCategroyName(bookCategory);
      bookDTO.setAuthors(authorsList);
      libraryServiceAsync.addBook(bookDTO, new AsyncCallback<Boolean>() {

     @Override
     public void onFailure(Throwable arg0) {
        Window.alert("There is some issue with database while adding book, Please contact your admin");

     }

     @Override
     public void onSuccess(Boolean arg0) {
        Window.alert("Book is successfully added !!!");
     }
      });
      this.hide();

   }

   @UiHandler("newAuthorButton")
   public void addAuthor(ClickEvent e) {
      authorTextBox.setVisible(true);
   }

   @UiHandler("newCategoryButton")
   public void addCategory(ClickEvent e) {
      categoryTextBox.setVisible(true);
   }

}

I am not sure, What is wrong but only header is appearing in the modal.

Answer 1

You are calling AddBook.this.show(); - this shows the Modal that is the base of this AddBook instance, not the instance defined in your UiBinder template. When you call setTitle(title); you are setting the header/title on this instance - this is why all you see is the header and not the rest of the modal. You should assign an ui:field to your Modal defined in your UiBinder template and show/hide it.

Also AddBook shouldn't be extending Modal - it shouldn't extend any widget class at all :) Normally, UiBinder classes are extending Composite - because your UiBinder template is composed of a variety of widgets and Composite is used to bring them together without exposing any of their APIs: you call initWidget with the result of binder.createAndBindUi(this) . But if you are creating a widget whose "main" widget is Modal , like here, you should just call binder.createAndBindUi(this) and ignore the Widget that is returned (just like you are doing now). This is because Modal attaches itself to the DOM, bypassing any GWT mechanism (actually, it conflicts with it).