[ Meteor JS ] – How to call a function when I click in a button ?

Always when you want call a function by any event in the screen you need create the function in events area. Look this exemple :

<template name="myTemplate">

<button type="button" id="addButton" >
    My button
</button>

</template>

This code above is to create the button in a html file. Now in the js file you need :

Template.myTemplate.events({
    'click #addButton': function (e) {
        // implement here the code on click
    }
)

In the same way you can use the onChange, onFocus and others events to call your functions.