Only variable expressions returning numbers or booleans are allowed in this context

Since Thymeleaf 3.0.10 they fixed a security-bug regarding unescaped code.

Try 

<body th:onload="[[${timerEnabled}]] ? 'javascript:runTimer(\'' + 
[[${timeRemaining}]] + '\');'">

Or the recommended way:

<body th:data1="${timerEnabled}"
  th:data2="${timeRemaining}"
    th:onload="this.getAttribute('data1') ? javascript:runTimer(this.getAttribute('data2'));">

To read more: https://github.com/thymeleaf/thymeleaf/issues/707 And: http://forum.thymeleaf.org/Thymeleaf-3-0-10-JUST-PUBLISHED-tt4031348.html#a4031353

Tags:

Javascript

Html

Spring

Spring Boot

Thymeleaf

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