Link a javascript file to a page not a template. Explained in simple terms.

When not embedding them directly from the Masterpage you usually add them to a template using a Web Part. The 'Head HTML Code' Web Part is suited for this.

If you want to make an exception it's usually best to just create a different template for the other pages. But in case it's depending on some other aspect you could use the enabled setting of the 'Head HTML Code' Web Part.

• Add the 'Head HTML Code' Web Part to the Template and add your JS reference
• based on your requirement let the Web Part only be Enabled when a certain condition is met

Click the Arrow icon to open the popup where you can use a macro:

e.g. When current document has a special boolean set to true or a certain field has a value.

Something like:

{% (bool)CurrentDocument.LoadScript %}

or

{% CurrentDocument.SpecialCategory == 'SpecialPage' %}

Can also be something completely different, but you didn't share the requirement.

What we have done is create a widgets based on the Head HTML Code and JavaScript web parts. Then update the templates to have a widget areas where we can add those widgets to. Widgets are page specific whereas wep parts are not