Can we use "ExecuteOrDelayUntilScriptLoaded" with application pages.?

Question

Can we use ExecuteOrDelayUntilScriptLoaded in application pages. If yes, do I need to add sp.js to the project to make it work?

Answer 1

Since SP.SOD.executeFunc supports on demand scripts, but SP.SOD.executeOrDelayUntilScriptLoaded does not, I would recommend to use SP.SOD.executeFunc with CSOM:

SP.SOD.executeFunc('sp.js', 'SP.ClientContext', function() {
    var clientContext = SP.ClientContext.get_current();
    console.log(clientContext.get_url());
});

Answer 2

ExecuteOrDelayUntilScriptLoaded is a method used to delay a function call unless a particular script is loaded. Yes, you can use it in application page. If you are using CSOM you need to add a reference to sp.js file.

You can also use SP.SOD.executeFunc if you are using on demand scripts.

A very good article on this is here