Enable javascript validation in eclipse luna

Question

Sometime ago I asked this question: Enable javascript validation for eclipse

I wanted eclipse to highlight javascript errors/warnings.. The problem as you can see in

Answer 1

Partial response (coz Need ans asked in comment): you can convert your project to a JavaScript project by adding the following nature to the .project file contained at the root of your project:

    //...  other project settings
    
        org.eclipse.wst.jsdt.core.jsNature
    

If you are not able to find .project see Showing or hiding files in the Project Explorer view for more details.