Meteor - How to give value from child to parent function?

Question

I want to send value of result from child to parent element. I used Session.set and Session.get and it works fine but I know that is not good practice because Sessions are global. So, I wanted to try something like reactive var or reactive dict but both of them are giving me only object as a result. What should I do or how should I take specific things from that object? (I am storing JSON inside that ReactiveVar or Dict and I know that they are really bad with JSON. Thank you for help!

Template.companyCreate.helpers({
    CompanyName : function () {
        if (Meteor.user() || Roles.userIsInRole(Meteor.user(),['admin','adminCreator'], 'companyAdmin')) {
            Meteor.call('findCompany', function(err, result) {
                if (err) {
                    console.log(err.reason)
                }
                else {
                    //this is where I want to take result and give it to parent function
                }
            });
            return //this is where I want to take result that was given from child function and return it to CompanyName
        }
        else {
            Router.go('/nemate-prava')
        }
    },

UPDATED CODE

    Template.companyCreate.onCreated(function Poruke() {
    this.message = new ReactiveVar(' ');

    let self = this;
    let user = Meteor.user();
    let companyNameHandler = Template.currentData().companyNameHandler;
    self.companyName = new ReactiveVar();

    if (user && Roles.userIsInRole(user,['admin','adminCreator'], 'companyAdmin')) {
        Meteor.call('findCompany', function(err, result) {
            if (err) {
                console.log(err.reason)
            }
            else {
                self.companyName.set(result);
                companyNameHandler(result);
                }
            });
        }
    else {
        Router.go('/nemate-prava')
    }
}); 

Template.companyCreate.helpers({
    message: () => { return Template.instance().message.get() },

    isNotInRole : function() {
        if (!Meteor.user() || !Roles.userIsInRole(Meteor.user(),['admin','adminCreator'], 'companyAdmin')) {
            return true;
        }
        else {
            return false;
        }
    },

    CompanyName : function () {
        return Template.instance().companyName.get();
    }
});

Template.companyCreate.events({
    'submit form': function(event, template) {
        var Ime = event.target.Ime.value;
        event.preventDefault();
        Meteor.call('companyCheck', Ime, function(error, result) {       
            if (error) {
                console.log(error.reason);
                template.message.set(error.reason);
                alert(error.reason);
            }
            else {
                event.target.Ime.value = "";
                console.log('Kompanija je uspesno kreirana!');
                template.message.set("Uspesno!");
            }
        })
    },
});

Method:

    'findCompany'(){
        ImeKompanije = firma.findOne({AdminID: this.userId}).ImeKompanije
        if (typeof ImeKompanije == 'undefind') {
            throw new Meteor.Error(err, "Greska!");
        }
        return ImeKompanije;

    },
});

Router:

    Router.route('/comp/:ImeKompanije', {
    name: 'companyProfile',
    template: 'companyProfile',
    waitOn: function() {
        return Meteor.subscribe('bazaFirmi', this.params.ImeKompanije)
    },
    action: function() {
        this.render('companyProfile', {
            data: function() {
                return firma.findOne({ImeKompanije: this.params.ImeKompanije});
            }
        });
    },
});

Answer 1

ok, there's a lot to unwind here. let's start with something small.

if (Meteor.user() || Roles.userIsInRole(Meteor.user(),['admin','adminCreator'], 'companyAdmin')) {

i think this line is meant to say, "if the user is an admin". but it's really saying, "if the user is logged in." if you meant the first one, then change the "||" to an "&&".

bigger issue is you're making a server call in a helper. helpers can get called over and over, so think of them as something that simply returns data. it should not have any side effects, such as making a server call or (yikes) re-routing the user.

so let's move all that side effect code to the onCreated() and capture the company name so it can be returned from the helper. We'll also get set up to return the company name to the parent.

Template.companyCreate.onCreated(function() {
    let self = this;
    let user = Meteor.user();
    let companyNameHandler = Template.currentData().companyNameHandler;

    self.companyName = new ReactiveVar();

    if (user && Roles.userIsInRole(user,['admin','adminCreator'], 'companyAdmin')) {
        Meteor.call('findCompany', function(err, result) {
            if (err) {
                console.log(err.reason)
            }
            else {
                self.companyName.set(result);
                companyNameHandler(result);
                }
            });
        }
    else {
        Router.go('/nemate-prava')
    }
});

now the helper is really simple, it just returns the data that was saved to the template's reactive var:

Template.companyCreate.helpers({
    CompanyName : function () {
        return Template.instance().companyName.get();
    }
});

the last part is setting up the handler to return the data to the parent. it's bad form to have the client reaching back up to its parent, so i usually have the parent give to the child a function it can call. usually i'll do that when the child says, "i've done my work," but here we can use it to provide that data. i'll have to make some assumptions on what your parent looks like.

<template name="Parent">
    {{> companyCreate companyNameHandler=getCompanyNameHandler}}
</template>

Template.Parent.helpers({
    getCompanyNameHandler() {
        let template = Template.instance();

        return function(companyName) {
            console.log(companyName);
            // you can also access the parent template through the closure "template"
        }
    }
});

the parent's helper returns a function that is passed to the client. when the client calls it, it will execute in the parent's closure. you can see i set up a variable called "template" that would allow you to, say, access reactive vars belonging to the parent.

UPDATE: in case the handler isn't known as is inside the Meteor.call() scope, we can try using it through a reactive var.

Template.companyCreate.onCreated(function() {
    let self = this;
    let user = Meteor.user();
    self.companyNameHandler = new ReactiveVar(Template.currentData().companyNameHandler);

    self.companyName = new ReactiveVar();

    if (user && Roles.userIsInRole(user,['admin','adminCreator'], 'companyAdmin')) {
        Meteor.call('findCompany', function(err, result) {
            if (err) {
                console.log(err.reason)
            }
            else {
                self.companyName.set(result);
                let fn = self.companyNameHandler.get();
                fn(result);
            }
        });
    }
    else {
        Router.go('/nemate-prava')
    }
});