One observation is if it is data-sly.test the it should be data-sly-test. replace .test with -test and check.

Updated above code is working as expected for me.

Logic should be public String getLaunchEnabled() { if (request.getParameter("launchDisabled") == null) return "true" ; return request.getParameter("launchDisabled"); } right. You code just checking null not returning the actual parameter value.

It should not be in Private-Package, it should be in Export-Package

@s1101v Check you package is under Private-Package, in bundle manifest. If so add package info(package-info.java) to your package and see.

@niks1 Updated the code and HTL above. I see in your Sling Model the method name is wrong. It should be "getLaunchEnabled" instead of getlaunchEnabled. L should be caps.

@Shaheena_Sheikh You want load scripts based on runmodes like author/publish or edit/non-edit mode?My suggestion is to have a edit mode check. <sly data-sly-test="${wcmmode.disabled}"> <script ...></script> <script ...></script> </sly> (OR) <sly data-sly-test="${slyWcmHelper.mode.disabled}">...

@saukaush What is version of AEM? Did you try ${slyWcmHelper.mode.edit}? Give a try. 

@Helen_DD Use activate event. The event will be called with panel as parameter.

@niks1 If you want to compare Strings then ${varOne == varTwo} returns true if varOne and varTwo are equal. Or try changing launchEnabled type from String to boolean. Check the docshttps://experienceleague.adobe.com/docs/experience-manager-htl/using/htl/expression-language.html?lang=en#comparison-op...