Boolean condition with Thymeleaf and Spring

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I\'d like to add an error flag in my web page. How can I to check if a Spring Model attribute is true or false with Thymeleaf?

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再見小時候

2021-02-13 21:14

You can access model attributes by using variable expression (${modelattribute.property}).

And, you can use th:if for conditional checking.

It looks like this:

Controller:

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class MyController {

  @RequestMapping("/foo")
  public String foo(Model model) {
    Foo foo = new Foo();
    foo.setBar(true);
    model.addAttribute("foo", foo);
    return "foo";
  }

}

HTML:

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
</head>
<body>
  <div th:if="${foo.bar}"><p>bar is true.</p></div>
  <div th:unless="${foo.bar}"><p>bar is false.</p></div>
</body>
</html>

Foo.java

public class Foo {
  private boolean bar;

  public boolean isBar() {
    return bar;
  }

  public void setBar(boolean bar) {
    this.bar = bar;
  }

}

Hope this helps.

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悲哀的现实

2021-02-13 21:21
The boolean literals are true and false.

Using the th:if you will end up with a code like:
```
<div th:if="${isError} == true">
```
or if you decide to go with the th:unless
```
<div th:unless="${isError} == false">
```
There is also a #bools utility class that you can use. Please refer to the user guide: http://www.thymeleaf.org/doc/tutorials/2.1/usingthymeleaf.html#booleans
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