I am working on a nested backbone view, in which if you click on, it will create a new instance of the same view. I want to disable only a specific event, not all of them; in this case, the click. I tried using undelegateEvents(), but this will disable all the functions. Any ideas on how can this be done?
Here is a piece of the code I am working on:
var View = Backbone.View.extend({
events: {
"mousedown": "start",
"mouseup": "over"
},
start: function() {
var model = this.model;
var v = new View({
model: model,
});
v.undelegateEvents(); //I just want to disable mousedown
v.render();
},
over: function() {
/*
some code here
*/
},
render: function() {
/*
some code here
*/
}
});
The idea is to ban clicking in the second instantiated view while keeping the other events. The first one will have all of its events.
Thanks
I am working on a nested backbone view, in which if you click on, it will create a new instance of the same view. I want to disable only a specific event, not all of them; in this case, the click. I tried using undelegateEvents(), but this will disable all the functions. Any ideas on how can this be done?
Here is a piece of the code I am working on:
var View = Backbone.View.extend({
events: {
"mousedown": "start",
"mouseup": "over"
},
start: function() {
var model = this.model;
var v = new View({
model: model,
});
v.undelegateEvents(); //I just want to disable mousedown
v.render();
},
over: function() {
/*
some code here
*/
},
render: function() {
/*
some code here
*/
}
});
The idea is to ban clicking in the second instantiated view while keeping the other events. The first one will have all of its events.
Thanks
Share Improve this question edited Jan 28, 2014 at 20:51 mu is too short 435k71 gold badges858 silver badges818 bronze badges asked Jun 1, 2012 at 21:07 rpabonrpabon 1,2012 gold badges17 silver badges22 bronze badges2 Answers
Reset to default 7You can specify the events you want to use when you call delegateEvents
:
delegateEvents
delegateEvents([events])
Uses jQuery's
delegate
function to provide declarative callbacks for DOM events within a view. If an events hash is not passed directly, usesthis.events
as the source.
So you could do something like this:
var v = new View({
model: model,
});
v.undelegateEvents();
var e = _.clone(v.events);
delete e.mousedown;
v.delegateEvents(e);
v.render();
You might want to push that logic into a method on View though:
detach_mousedown: function() {
this.undelegateEvents();
this.events = _.clone(this.events);
delete this.events.mousedown;
this.delegateEvents();
}
//...
v.detach_mousedown();
You need the this.events = _.clone(this.events)
trickery to avoid accidentally altering the "class's" events
(i.e. this.constructor.prototype.events) when you only want to change it for just one object. You could also have a flag for the View
constructor that would do similar things inside its initialize
:
initialize: function() {
if(this.options.no_mousedown)
this.detach_mousedown()
//...
}
Another option would be to have a base view without the mousedown
handler and then extend that to a view that does have the mousedown
handler:
var B = Backbone.View.extend({
events: {
"mouseup": "over"
},
//...
});
var V = B.extend({
events: {
"mousedown": "start",
"mouseup": "over"
},
start: function() { /* ... */ }
//...
});
You'd have to duplicate the B.events
inside V
or mess around with a manual extend
on the events
as _.extend
won't merge the properties, it just replaces things wholesale.
Here is a simple example that shows how to delegate or undelegate events within a Backbone view
Backbone.View.extend({
el: $("#some_element"),
// delete or attach these as necessary
events: {
mousedown: "mouse_down",
mousemove: "mouse_move",
mouseup: "mouse_up",
},
// see call below
detach_event: function(e_name) {
delete this.events[e_name]
this.delegateEvents()
},
initialize: function() {
this.detach_event("mousemove")
},
mouse_down: function(e) {
this.events.mousemove = "mouse_move"
this.delegateEvents()
},
mouse_move: function(e) {},
mouse_up: function(e) {}
})