Thymeleaf – How to add checked attribute to input conditionally

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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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