backbone.js视图确定模型的哪个属性被改变
我如何知道渲染函数中视图模型的哪个属性被更改？ （在渲染函数中，“e”是模型，但我只需要更改的属性。）我需要知道这一点才能知道要使用哪个模板。或者还有其他方法可以做到这一点吗？
window.Person = Backbone.Model.extend({});
window.Njerzit = Backbone.Collection.extend({
model: Person,
url: '/Home/Njerzit'
});
window.PersonView = Backbone.View.extend({
tagName: 'span',
initialize: function () {
_.bindAll(this, 'render');
this.model.bind('change', this.render);
},
render: function (e) {
//if model name is changed, I need to render another template
this.template = _.template($('#PersonTemplate').html());
var renderContent = this.template(this.model.toJSON());
$(this.el).html(renderContent);
return this;
}
});
How can I know which attribute of the view model is changed in the render function? (In the render function, "e" is the model, but I need only the attribute which is changed.) I need to know this to know which template to use. Or is there another method to do this?
window.Person = Backbone.Model.extend({});
window.Njerzit = Backbone.Collection.extend({
model: Person,
url: '/Home/Njerzit'
});
window.PersonView = Backbone.View.extend({
tagName: 'span',
initialize: function () {
_.bindAll(this, 'render');
this.model.bind('change', this.render);
},
render: function (e) {
//if model name is changed, I need to render another template
this.template = _.template($('#PersonTemplate').html());
var renderContent = this.template(this.model.toJSON());
$(this.el).html(renderContent);
return this;
}
});
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评论（2）
我相信
changedAttributes函数就是您正在寻找的或者使用
hasChanged函数检查特定属性是否已更改I believe the
changedAttributesfunction is what you're looking foror to check if a specific attribute has changed use the
hasChangedfunction如果您只想通知名称是否已更改，则可以绑定到
change:name：http ://documentcloud.github.com/backbone/#Model-setYou can bind to
change:nameif you only want to notify if the name has changed: http://documentcloud.github.com/backbone/#Model-set