Passing value from controller to html in spring

Question

Hello I have a simple web page where I have a button and a text near to button. I need to change text when button clicked and get the new text from code.

This is con

Answer 1

Try these : <p align="center">${stream}</p> or <p th:text="${stream}"></p>

This tag may be causing a problem :

<button class="button"
        onclick="window.location.href = '/stream';">Stream</button>

Please check it by removing this.

Answer 2

Thank you for your help. Below shown line helped:

<p th:inline="text">[[${stream}]]</p>

Answer 3

Change

<p align="center">?????</p>

To

<p align="center">${stream}</p> OR <p th:text="${stream}"></p> 

How it is working?

You can access variables value by ${key}.

Example

model.addAttribute("key", value);   

Get value by ${key} in HTML

In Thymeleaf, these model attributes (or context variables in Thymeleaf jargon) can be accessed with the following syntax: ${attributeName}, where attributeName in our case is stream. This is a Spring EL expression. In short, Spring EL (Spring Expression Language) is a language that supports querying and manipulating an object graph at runtime.

UPDATE

The th:field attribute can be used on input, select, or, textarea.

Replace <p align="center">?????</p> with

<input type="text" id="stream" name="stream" th:value="${stream}" />

OR

<input type="text" th:field="*{stream}" />`

OR

<input type="text" id="stream" name="stream" th:field="*{stream}" th:value="${stream}" />

Also try <p th:inline="text">[[${stream}]]</p>; <p data-th-text="${stream}" />

Thymeleaf Document Thymeleaf Document Inputs

---

UPDATE 2

Get value from Thymeleaf to Spring Boot

<form th:action="@{/send}" method="get">
   <textarea  th:name="doc" rows="10" cols="100" name="doc"></textarea>
   <button type="submit">Send</button>
</form>

    @GetMapping("/send")
    public String send(@RequestParam(name="doc", required = false) String doc) {
        //change required = false as per requirement
        System.out.println("Doc: "+doc);
        return "textarea-input";
    }

Note: use "th:field" for Entity/Model