I wonder if possible to pass multiple collections into a view once fetched, something like:
Collection1 = new Collections.Collection();
Collection1.fetch({
success: function (collection) {
//save it somewhere
}
});
Collection2 = new Collections.Collection();
Collection2.fetch({
success: function (collection) {
//save it somewhere
}
});
So once they are loaded... render my view (which also, Idk how to wait until both are fetched, so any help would be appreciated).
var template = _.template( $('#myTemplate').html(), { col1: collection1, col2 : collection2 } ) ;
Is this posible?, if not, what could I do if I need to access to different collections values into a template?
Thanks a ton in advanced!
Backbone .fetch return a promise object, you can use $.when
$.when(firstCollection.fetch(), secondCollection.fetch()).then(function () {
//both are fetched
});
Yes you can, if your template is ready to work with col1 and col2, load both collections in the view, and setup event listeners so you re-render when any of them is ready:
var MyDoubleColView = Backbone.View.extend({
initialize: function(options){
this.firstCollection = new Collections.Collection();
this.secondCollection = new Collections.Collection();
this.listenTo(this.firstCollection, "reset", this.render);
this.listenTo(this.secondCollection, "reset", this.render);
this.firstCollection.fetch({reset:true});
this.secondCollection.fetch({reset:true});
},
render: function(){
var template = _.template( $('#myTemplate').html(),
{ col1: this.firstCollection.toJSON(), col2 : this.secondCollection.toJSON() }) ;
}
});
This will cause your view to re-render when any of the collections is hydrated from the server. I've used the reset event but you can use any other of the collection server-related events, like sync.
Have your template be ready for having an empty collection and you'll be good to go. :)
Related
I want to perform an action, clearing parent element, after a collection has fetched his models but prior to the models rendering.
I've stumbled upon before and after render methods yet they are model specific, which will cause my parent element to clear before every model rendering.
I'm able of course to perform the action pre-fetching yet I want it to occur when fetch is done and before models are rendered.
I tried using reset and change events listening on the collection yet both resulted unwanted end result.
Reset event seamed to go in that direction yet the passed argument was the entire collection and not a single model from the collection, therefore using the add event callback wasn't possible due to difference in argument type (collection and not a model as required)
Any ideas how to invoke a callback when fetch a collection fetch is successful yet models are yet to be rendered?
The model contains the returned attributes while collection contains url for fetching and parse method to return argument wrapped object.
Below is the code I use to render the collection view, which is basically rendering each model's view within the collection.
Collection View
---------------
var FoosView = Backbone.View.extend({
el: '#plans',
events: {
//'click tr': 'rowClick'
},
initialize: function() {
this.listenTo(this.collection, 'add', this.renderNew);
_.bindAll(this, "render");
this.render();
},
renderNew: function(FooModel) {
var item = new FooView({model: FooModel});
this.$el.prepend(item.render().$el);
}
...
});
The model view
--------
var FooView = Backbone.View.extend({
tagName: 'li',
initialize: function(options) {
this.options = options || {};
this.tpl = _.template(fooTpl);
},
render: function() {
var data = this.model.toJSON();
this.$el.html(this.tpl(data));
return this;
}
});
Thanks in advance.
OK, I think I understand your question and here is a proposed solution. You are now listening to the reset event on your collection and calling this.renderAll. this.renderAll will take the list of models from the collection and render them to the page, but only AFTER the list element has been emptied. Hope this helps :).
var FoosView = Backbone.View.extend({
el: '#plans',
collection: yourCollection, // A reference to the collection.
initialize: function() {
this.listenTo(this.collection, 'add', this.renderNew);
this.listenTo(this.collection, 'reset', this.renderAll);
},
renderAll: function() {
// Empty your list.
this.$el.empty();
var _views = []; // Create a list for you subviews
// Create your subviews with the models in this.collection.
this.collection.each(function(model) {
_views.push(new FooView({model: model});
});
// Now create a document fragment so as to not reflow the page for every subview.
var container = document.createDocumentFragment();
// Append your subviews to the container.
_.each(_views, function(subview) {
container.appendChild(subview.render().el);
});
// Append the container to your list.
this.$el.append(container);
},
// renderNew will only run on the collections 'add' event.
renderNew: function(FooModel) {
var item = new FooView({model: FooModel});
this.$el.prepend(item.render().$el);
}
});
I am forced to assume a few things about you html, but I think the above code should be enough to get you up and running. Let me know if it works.
I'm not totally sure about what you are asking but have you tried:
MyCollection.fetch({
success: function(models,response) {
//do stuff here
}
});
Also you may be interested taking a look at http://backbonejs.org/#Model-parse
Hope it helps!
Edit: there is no direct link between fetching and rendering my bet is that you binded rendering to model change.
USE===============>>>> http://backbonejs.org/#Model-parse
Im having trouble figuring out how to populate a model's attributes from the server and then add the populated model to a collection and have that collection rendered by a view. Here's the code I have:
var movieDetails = new cinephile.Models.MovieDetailsModel({ id: movie.get('id') });
this.collection.add(movieDetails);
Inside of the MovieDetailsModel:
cinephile.Models.MovieDetailsModel = Backbone.Model.extend({
url: function()
{
return '/cinephile/api/index.php?action=getMovieDetails&movieId=' + this.id;
},
initialize: function()
{
this.fetch();
}
});
And this.collection is just a collection with the model set to be a cinephile.Models.MovieDetailsModel
I am listening for items to be added to the collection and when they are, the following is executed:
displayMovie: function(movie)
{
var view = new cinephile.Views.MovieView({
model: movie,
className: 'movie clearfix',
template: JST['app/scripts/templates/MovieView.ejs'],
});
this.$("#my-movies").append(view.el);
},
MovieView looks like this:
cinephile.Views.MovieView = Backbone.View.extend({
initialize: function(options)
{
this.template = options.template;
this.render();
},
render : function()
{
this.$el.html(this.template(this.model.attributes));
return this;
},
});
The problem I have is that the template I'm using is trying to access an attribute of the model that is undefined. Im pretty sure it's undefined because the MoveDetailsModel hasn't finished fetching before the model is added to the collection and subsequently rendered to the view.
How can I solve this issue? I'd like to be able to create a MovieDetailsModel that takes in an id, use that id to get the movie details from the server and then add the populated model to a collection and then render that collection to the screen.
Any help is appreciated.
Backbone fetch returns a jqXHR object, which is a Deferred objects Promise.
When fetch is called, the attributes are not populated yet. Promise objects have a don
ejqXHR function, where a callback can be passed to be executed once the request is done.
I would recommend moving the fetch into another method not the constructor, because there You can return the jqXHR object and access its done function.
Here is an example:
var movieDetails = new cinephile.Models.MovieDetailsModel({ id: movie.get('id') });
var promise = movieDetails.fetch();
promise.done(function() {
var view = new cinephile.Views.MovieView({model: movieDetails});
view.render();
});
I'm creating an application for Phonegap using Backbone framework and Parse.com as backend service. I create an object with Parse.com (corresponding to Backbone models).
This object has a saveDraftToP() method that calls the Parse.com function save().
After this method is called from a view, I'd like to retrieve the updated object.
To do so I'm binding the 'change' event to the model but the Parse assigned ID is undefined.
Here is the code of the model:
var Match = Parse.Object.extend("Match", {
states: {'DRAFT': 0, 'RUNNING': 1, 'ENDED': 2},
saveDraftToP: function () {
var self = this;
this.save({
user: Parse.User.current(),
ACL: new Parse.ACL(Parse.User.current()),
state: self.states.DRAFT
}, {
success: function (result) {
self = result;
},
error: function (e) {
}
});
}
});`
And here is the code for the view:
var vmNuovaPartita = Parse.View.extend({
template: Handlebars.compile(template),
model: new Match(),
collection: new HintCollection(),
initialize: function () {
this.bind("change:model", console.log(this.model.id) , this);
},
render: function (eventName) {
var match = this.model.toJSON();
$(this.el).html(this.template(match));
return this;
}
});
I'm not quite sure why you have a save function wrapped in another save-like function. :-)
Say you have something like myMatch which is an object.
Through your UI, a button click saves the object data. You can just use myMatch.save({attr:val, ...}) straight out of the box. Backbone (and Parse) by default are optimistic. That means, you it will set the values of the model with the expectation that persisting to the server will succeed.
Thus, you don't need to retrieve anything extra. You already have the model in it's most current state.
To have a model view that responds to these changes, I'd design the view a little differently.
var vmNuovaPartita = Parse.View.extend({
template: Handlebars.compile(template),
initialize: function () {
this.model.on('change', this.render);
},
render: function (eventName) {
var match = this.model.toJSON();
$(this.el).html(this.template(match));
return this;
}
});
var myView = new vmNuovaPartita({
model: myModel
});
I'd initialize the model outside of the view, then pass it in as an option when you generate a new view. When you pass a model in as an option, it's special and will be attached directly to the view ... view.model which you can refer inside your view code as this.model
In the init we place a listener on the model for change events, then fire off a rerender of the view. Or a nicer way to go about this sort of thing is to throw in the newer Backbone Events with the .listenTo() method.
I have the following problem…
MyView which is connected to two views: TaskModel and UserModel
TaskModel = {id: 1, taskName: "myTask", creatorName: "myName", creator_id: 2 },
UserModel = {id: 2, avatar: "someAvatar"}
The view should display
{{taskName}}, {{creatorName}}, {{someAvatar}}
As you can see the fetch of TaskModel and UserModel should be synchronized, because the userModel.fetch needs of taskModel.get("creator_id")
Which approach do you recommend me to display/handle the view and the two models?
You could make the view smart enough to not render until it has everything it needs.
Suppose you have a user and a task and you pass them both to the view's constructor:
initialize: function(user, task) {
_.bindAll(this, 'render');
this.user = user;
this.task = task;
this.user.on('change', this.render);
this.task.on('change', this.render);
}
Now you have a view that has references to both the user and the task and is listening for "change" events on both. Then, the render method can ask the models if they have everything they're supposed to have, for example:
render: function() {
if(this.user.has('name')
&& this.task.has('name')) {
this.$el.append(this.template({
task: this.task.toJSON(),
user: this.user.toJSON()
}));
}
return this;
}
So render will wait until both the this.user and this.task are fully loaded before it fills in the proper HTML; if it is called before its models have been loaded, then it renders nothing and returns an empty placeholder. This approach keeps all of the view's logic nicely hidden away inside the view where it belongs and it easily generalizes.
Demo: http://jsfiddle.net/ambiguous/rreu5jd8/
You could also use Underscore's isEmpty (which is mixed into Backbone models) instead of checking a specific property:
render: function() {
if(!this.user.isEmpty()
&& !this.task.isEmpty()) {
this.$el.append(this.template({
task: this.task.toJSON(),
user: this.user.toJSON()
}));
}
return this;
}
That assumes that you don't have any defaults of course.
Demo: http://jsfiddle.net/ambiguous/4q07budc/
jQuery's Deferreds work well here. As a crude example:
var succesFunction = function () {
console.log('success');
};
var errorFunction = function () {
console.log('error');
};
$.when(taskModel.fetch(), userModel.fetch()).then(successFunction, errorFunction);
You could also pipe the request through using the crude data (remember that fetch, save, create are really just wrappers around jQuery's $.ajax object.
var taskModelDeferred = taskModel.fetch();
var userModelDeferred = taskModelDeferred.pipe(function( data ) {
return userModel.fetch({ data: { user: data.userId }});
});
note: Backbone returns the collection and model in the success / error functions by default on collections and models so if you need this be sure have a reference handy.
I've run into this very same issue with a complex layout that used two models and multiple views. For that, instead of trying to synchronize the fetches, I simply used the "success" function of one model to invoke the fetch of the other. My views would listen only to the change of the second model. For instance:
var model1 = Backbone.Model.extend({
...
});
var model2 = Backbone.Model.extend({
...
});
var view1 = Backbone.View.extend({
...
});
var view2 = Backbone.View.extend({
...
});
model2.on("change",view1.render, view1);
model2.on("change",view2.render, view2);
Then...
model1.fetch({
success : function() {
model2.fetch();
}
});
The point to this is you don't have to do any sophisticated synchronization. You simply cascade the fetches and respond to the last model's fetch.
I'm having a look at Backbone.js, but I'm stuck. The code until now is as simple as is possible, but I seem not to get it. I use Firebug and this.moments in the render of MomentsView is an object, but all the methods from a collection don't work (ie this.moments.get(1) doesn't work).
The code:
var Moment = Backbone.Model.extend({
});
var Moments = Backbone.Collection.extend({
model: Moment,
url: 'moments',
initialize: function() {
this.fetch();
}
});
var MomentsView = Backbone.View.extend({
el: $('body'),
initialize: function() {
_.bindAll(this, 'render');
this.moments = new Moments();
},
render: function() {
_.each(this.moments, function(moment) {
console.log(moment.get('id'));
});
return this;
}
})
var momentsview = new MomentsView();
momentsview.render();
The (dummy) response from te server:
[{"id":"1","title":"this is the moment","description":"another descr","day":"12"},{"id":"2","title":"this is the mament","description":"onother dascr","day":"14"}]
The object has two models according to the DOM in Firebug, but the methods do not work. Does anybode have an idea how to get the collection to work in the view?
The problem here is that you're fetching the data asynchronously when you initialize the MomentsView view, but you're calling momentsview.render() synchronously, right away. The data you're expecting hasn't come back from the server yet, so you'll run into problems. I believe this will work if you call render in a callback to be executed once fetch() is complete.
Also, I don't think you can call _.each(this.moments) - to iterate over a collection, use this.moments.each().
Try removing the '()' when instantiate the collection.
this.moments = new Moments;
Also, as it's an asynchronous call, bind the collection's 'change' event with the rendering.
I hope it helps you.