我正在尝试创建一个使用 li
元素作为可选 View 的应用程序。该应用程序要求使用单击并拖动界面选择多个元素。因此,我使用 Backbone.js 来跟踪元素状态和 View ,并使用 jQuery UI Selectable 作为选择 UI。
目前,我拥有的唯一结构是主应用程序 View 、li
元素的模型和 View 以及模型的集合。
构造此结构的最佳方法是什么,以便我的主应用程序 View 可以跟踪所选元素并与之交互?
最佳答案
这是我不久前所做的事情的删节版本。对于您的需要来说,它可能过于复杂,但它确实有效。我需要能够以编程方式选择/取消选择项目,并让 jQuery-selectable 处理它,这就是模型具有 Selected
属性的原因。通过这种方法,您可以执行 model.set({Selected:true})
并且 UI 中的所有内容都保持同步。
添加了 jsFiddle 来演示它:http://jsfiddle.net/phoenecke/VKRyS/5/
然后在您的应用程序 View 中,您可以执行以下操作:
_.each(collection.where({Selected:true}), function(item){
// do something with item
});
希望有帮助。
项目 View :
var ItemView = Backbone.View.extend({
tagName: "li",
initialize: function(options) {
this.listenTo(this.model, 'change:Selected', this.selectedChanged);
},
render: function() {
this.$el.html(template(this.model));
// add cid as view's id, so it can be found when jQuery-selectable says selection changed (in ListView below).
this.$el.attr({
'id': this.model.cid
});
this.selectedChanged();
return this;
},
selectedChanged: function() {
// respond to model's Selected change event.
// This way, you can programmatically change it, ie. model.set({Selected:true}).
// but usually this class is already on the view,
// since jQuery selectable adds/removes it. it does not hurt to re-add it,
// but you could check for the class.
if(this.model.get('Selected')) {
this.$el.addClass('ui-selected');
} else {
this.$el.removeClass('ui-selected');
}
}
});
ListView :
var ListView = Backbone.View.extend({
initialize: function(options) {
this.listenTo(this.collection, 'reset', this.render);
this._views = {};
},
render: function() {
this.collection.each(function(item) {
var view = new ItemView({model: item});
this._views[item.cid] = view;
this.$el.append(view.render().el);
}, this);
this.setupSelectable();
},
setupSelectable: function() {
var thisView = this;
// Set up JQuery UI Selectable
this.$el.selectable({
filter: 'li',
selected: function(event, ui) {
var cid = ui.selected.id;
var view = thisView._views[cid];
if(view) {
// I think I only did this stuff to keep the model's Selected
// attribute in sync with the UI.
// this will trigger a redundant call to 'selectedChanged' in the
// ItemView, but it has no negative effect.
view.model.set({
Selected: true
});
}
},
unselected: function(event, ui) {
var cid = ui.unselected.id;
var view = thisView._views[cid];
if(view) {
view.model.set({
Selected: false
});
}
}
});
}
});
关于jquery - 将 Backbone.js 与 jQuery UI 集成可选,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15234601/