如何在百里香中动态创建多个嵌套对象

Question

Currently i'm doing website with newsletter posting. I want to post and show comments under every post.

MY POST

• first comment
  • comments to first comment
    • comments to second comment -so on...
• second comment
• third comment

I know how to dynamically create elements in a loop with one level of nesting. But how can i create multiple nesting?

For example I can create comments:

<div class='comments' th:each="comment : ${comments}">
  <div class='comment' th:text='comment'/>
</div>

How can I create multiple nesting?

<div class='comments' th:each="comment : ${comments}">
  <div class='comment' th:text='comment'>
      <div class='comment' here comment to comment/>
          etc..
  </div>
</div>

Answer 1

I think you'll have to do this with fragments . For example, with an object like this:

Objects

class Comment {
    private String text;
    private List<Comment> children = new ArrayList<>();

    public Comment(String text, Comment... children) {
        this.text = text;
        this.children.addAll(Arrays.asList(children));
    }

    public String getText() {return text;}
    public void setText(String text) {this.text = text;}

    public List<Comment> getChildren() {return children;}
    public void setChildren(List<Comment> children) {this.children = children;}
}

Controller:

List<Comment> comments = new ArrayList<>();
comments.add(new Comment("hello", new Comment("nooooo")));
comments.add(new Comment("it's another comment", new Comment("again", new Comment("yeah!"))));
comments.add(new Comment("whoopity doo"));
model.put("comments", comments);

You can output a chain of nested comments with fragments like this:

<th:block th:each="comment: ${comments}">
    <div th:replace="template :: comments(${comment})" />
</th:block>

<th:block th:if="${false}">
    <ul th:fragment="comments(comment)">
        <li>
            <div th:text="${comment.text}" />

            <th:block th:unless="${#lists.isEmpty(comment.children)}" th:each="child: ${comment.children}">
                <div th:replace="template :: comments(${child})" />
            </th:block>
        </li>
    </ul>
</th:block>