Inherit Java Script file

Question

Hello I would like to inherit JavaScript file gantt.js in web_gantt module.
My code is like that
openerp.mrp_smart_planning = function(instance){
var module = instance.web_gantt;
module.GanttView.include({
init : function(){
alert('Hello!');
module._super();
},
});
};
(in file named mrp_smart_planning.js)
After reloading webpage, when I want to see gantt view "Hello" alert appear, but after shows windows with text below:
Uncaught TypeError: Cannot read property '_model' of undefined

Tadeusz Jan Karpiński · Answer

I found a solution.

openerp.mrp_smart_planning = function(instance){
var module = instance.web_gantt;
module.GanttView.include({
init : function(view, node){
alert('Hello!');
this._super(view, node);
},
});
};

Simplify it! · Answer

Try with this:

openerp.mrp_smart_planning = function(instance){
var module = instance.web_gantt;
module.GanttView=module.GanttView.extend({
init : function(){
alert('Hello!');
this._super();
},
});

};

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