在阅读了您对我之前的回答的回复后,我浏览并修改了我的示例,希望能让您了解如何使用命名视图实现系统,使您可以根据需要控制排序。如果这有帮助,或者您对它的工作原理有任何疑问,请告诉我。
var viewCtor = Backbone.View.prototype.constructor;
// Assuming we have a reference to the subviews already
var BaseCrudView = Backbone.View.extend({
// This is null for an important reason, see comment in constructor
subViews: null,
// Override the constructor instead of initialize since this is meant to be a base object, so things that
// inherit don't have to remember to call the parent inialize every time.
constructor: function() {
viewCtor.apply(this, arguments);
// It is important this is initialized when instantiating the view rather than in the prototype.
// Backbone's extend() will "copy" the prototype properties of the parent when extending, which really
// just performs an assignment. If this were initialized above in the prototype then all children
// that inherit from that prototype would share the exact same instance of the array/object. If a child
// adds something to the array, it would be changed for all instances that inherit from the parent.
this.subViews = {
header: new HeaderView(),
table: new TableView
};
this.subViewOrder = [
'header',
'table'
];
},
addBefore: function(subView, name, beforeView) {
this.subViews[name] = subView;
var viewLoc = this.subViewOrder.indexOf(beforeView);
if(viewLoc == -1) {
viewLoc = 0;
}
this.subViewOrder.splice(viewLoc, 0, name);
},
addAfter: function(subView, name, afterView) {
this.subViews[name] = subView;
var viewLoc = this.subViewOrder.indexOf(afterView);
if(viewLoc == -1) {
viewLoc = this.subViewOrder.length - 1;
}
this.subViewOrder.splice(viewLoc + 1, 0, name);
},
moveBefore: function(name, beforeView) {
this.addBefore(this.subViews[name], name, this.subViewOrder.splice(this.subViewOrder.indexOf(name), 1));
},
moveAfter: function(name, afterView) {
this.addAfter(this.subViews[name], name, this.subViewOrder.splice(this.subViewOrder.indexOf(name), 1));
},
render: function() {
var that = this;
_.each(this.subViewOrder, function(viewName) {
// Assumes the render() call on any given view returns 'this' to get 'el'
that.$el.append(this.subViews[viewName].render().el);
});
return this;
}
});
var BulkCrudView = BaseCrudView.extend({
inialize: function() {
// Skipping the last parameter causes it to insert at the end
this.addAfter(new BulkView(), 'bulkView');
}
});
有了这个,您可以轻松地在初始化时扩展BulkCrudView
和修改其subViews
数组以添加/插入任何您想要的。不过,它也可以实例化 aBaseCrudView
并使用视图方法。只要感觉更干净和/或漂浮你的船。