Thymeleaf - 如何有条件地添加检查属性到输入 [英] Thymeleaf - How to add checked attribute to input conditionally

问题描述

正如你所知道的， input 组件有一个属性，被选中是否将复选框标记为默认启用或不。

 < input type =checkboxname =mycheckboxchecked =checked/> 
  

默认情况下禁用复选框，选中应声明异常。是否可以通过Thymeleaf中的一个标记设置 checked 属性？

解决方案

根据官方的thymeleaf文件

http://www.thymeleaf.org/doc/tutorials/2.1/usingthymeleaf.html#fixed-value-boolean-attributes

th：checked 被视为一个固定值布尔属性。

 < input type =checkboxname =activeth：checked =$ {user.active}/> 
  

其中 user.active 应该是 boolean 。

所以在你的情况下，应该像 Andrea 提到的那样，

 < input type =checkboxname =mycheckboxth：checked =$ {flag}/> 
  

As you know, input component has an attribute, checked to whether mark the checkbox as enabled by default or not.

<input type="checkbox" name="mycheckbox" checked="checked"/>

To disable the checkbox by default, the checked exception should be declared. Is it possible to set checked attribute by a flag in Thymeleaf?

解决方案

According to the official thymeleaf documentation

http://www.thymeleaf.org/doc/tutorials/2.1/usingthymeleaf.html#fixed-value-boolean-attributes

th:checked is considered as a fixed-value Boolean attribute.

<input type="checkbox" name="active" th:checked="${user.active}" />

Where user.active should be a boolean.

So in your case it should be as Andrea mentioned,

<input type="checkbox" name="mycheckbox" th:checked="${flag}" />

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