How can I call other methods from the current method?

Question

I am trying to do this, but nothing works ... I am a beginner.

//helper js

getDataFromDB : function(component){
    let action = component.get('c.getListContacts');
    action.setCallback(this, function(response){
       let state = response.getState();
           if (state === "SUCCESS") {
               let rows = response.getReturnValue();
                component.set("v.contacts", rows);
            }
    });
    $A.enqueueAction(action);
    this.calculateAmountPage(component);
    this.getDisplayDataPagination(component);

},

Methods "calculateAmountPage" and "getDisplayDataPagination" are located below in the same helper.js file.

Answer 1

You need to use the helper reference to access those functions. To do so:

Accept the helper reference in the helper function

getDataFromDB : function(component, event, helper){

And pass it in by accepting the helper reference in the controller function. e.x.

onButtonClick : function(component, event, helper){
  getDataFromDB(component, event, helper);
}

Then call the other functions like this

helper.calculateAmountPage(component);
helper.getDisplayDataPagination(component);