Thymeleaf 和 Spring 的布尔条件
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Boolean condition with Thymeleaf and Spring
提问by vdenotaris
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?
我想在我的网页中添加一个错误标志。如何使用 Thymeleaf 检查 Spring 模型属性是真还是假？
回答by Garis M Suero
The boolean literals are trueand false.
布尔文字是true和false。
Using the th:ifyou will end up with a code like:
使用th:if你最终会得到如下代码：
<div th:if="${isError} == true">
or if you decide to go with the th:unless
或者如果你决定去 th:unless
<div th:unless="${isError} == false">
There is also a #boolsutility class that you can use. Please refer to the user guide: http://www.thymeleaf.org/doc/tutorials/2.1/usingthymeleaf.html#booleans
#bools您还可以使用一个实用程序类。请参考用户指南：http: //www.thymeleaf.org/doc/tutorials/2.1/usingthymeleaf.html#booleans
回答by Shinichi Kai
You can access model attributes by using variable expression (${modelattribute.property}).
您可以使用变量表达式 ( ${modelattribute.property})访问模型属性。
And, you can use th:iffor conditional checking.
而且，您可以使用th:if进行条件检查。
It looks like this:
它看起来像这样：
Controller:
控制器：
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class MyController {
@RequestMapping("/foo")
public String foo(Model model) {
Foo foo = new Foo();
foo.setBar(true);
model.addAttribute("foo", foo);
return "foo";
}
}
HTML:
HTML：
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
</head>
<body>
<div th:if="${foo.bar}"><p>bar is true.</p></div>
<div th:unless="${foo.bar}"><p>bar is false.</p></div>
</body>
</html>
Foo.java
文件
public class Foo {
private boolean bar;
public boolean isBar() {
return bar;
}
public void setBar(boolean bar) {
this.bar = bar;
}
}
Hope this helps.
希望这可以帮助。
