Backbone view render with multiple model fetch

问题:

I need to spend 1 model and 1 collection in my html template with backbone. But sometimes, html is ready after the model. I have :

var FormUtilisateurView = Backbone.View.extend({

    initialize: function(id){
        this.listeClient = new ClientsCollection();
        this.utilisateur = new UtilisateurModel({ id : id });
    },

    render: function(){
        var that = this;
        this.utilisateur.fetch();
        this.listeClient.fetch().done(function(){
            that.$el.html(FormTemplate({ clients : that.listeClient.models, user : that.utilisateur }));

        });
        return this;
    }
});

Here, only listeClient collection is loaded. I want to be sure my model and collection are loaded before the template.

Thank you in advance

回答1:

You can combine the requests' promises returned by fetch with jquery.when to synchronize your rendering task. Something like:

render: function(){
    var that = this, promises = [], 
        user = this.utilisateur, clients = this.listeClient;

    promises.push(user.fetch());
    promises.push(clients.fetch());

    $.when.apply(null, promises).done(function(){
        that.$el.html(FormTemplate({clients: clients.models, user: user}));
    });

    return this;
}