如何使用javascript正确隐藏XSL处理的XML元素列表

Good morning. I have an XML file which contains lists of warning and errors from a build output. I have successfully been able to write XSL to iterate over the separate lists of warnings and errors to have them display in my browser. What I'd like to do next would be to add a bit of javascript in order to add a link/button to be able to toggle the display of the warnings. I can't get it to work properly.Good morning. I have an XML file which contains