MeteorJs : How to making operations when the template is on or after render ?

Use : Template.MyNameTample.onRendered

Example :

Template.PaymentResult.onRendered(function() {
    $(window).scrollTop(0);
    var instance =  Template.instance();
    instance.autorun(function() {
        processando.set(true);
        run();
    });
});

Here in this code I’m using FlowRouter

You can too use :

Use : Template.MyNameTemplate.rendered

Template.SessionEvent.rendered = function(){
    // DO SOMETHING
};