You can solve the immediate problem by using underscore's bind
method (see documentation) to ensure that this
in the click handler refers to the Backbone view and not the element you've bound the handler to:
App.Views.Incentive = Backbone.View.extend({
el: $('#projet-page'),
name: "Incentive",
initialize: function () {
"use strict";
$('section[data-projet-page="' + this.name + '"] a.OpenGalerie').on('click', _.bind(this.enterGalerieClick, this));
},
enterProjectClick: function () {
Backbone.history.navigate('!/case-projet/' + this.name + '/Galerie'),
$('section[data-projet-page="' + this.name + '"]').css('display', 'block'),
},
});