Boolean condition with Thymeleaf and Spring

Question

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?

Answer 1

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:

  
bar is true.
  
bar is false.

Foo.java

public class Foo {
  private boolean bar;

  public boolean isBar() {
    return bar;
  }

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

}

Hope this helps.