JavaScript中的View-Model使用介绍

// 留言模型
var Reply = {
cache : {},
// { sourceid : id,page_size : 10,page_num : 1 }
fetch : function(data) {
return $.post('/ajax/blog/reply/list',data||{}).success(function(resp) {
resp.ok && resp.list &&
$.each(resp.list,function(k,v) {
return Reply.cache[v.id] = v;
});
});
},
// filter('name','king')
filter : function(prop,val) {
return $.grep(this.cache,function(r){ return r[prop] === val });
},
// { content : '想说就说',sourceid : 1001 }
create : function(data) {
// promise
var dfd = $.Deferred(), now = $.now();
if( (now - this.create.timestamp)/1000 < 10 ){
dfd.reject({message:'您发表得太快了，休息一下吧',type:'warn'})
}else if(!data || !data.sourceid){
dfd.reject({message:'非法操作',type:'error'})
}else if(!data.content){
dfd.reject({message:'评论内容不能为空',type:'warn'})
}else{
this.create.timestamp = now;
dfd = $.post('/ajax/blog/reply/create',data);
}
return dfd.promise();
}
};
Reply.create.timestamp = Forward.create.timestamp = $.now() - 1e4;

// 回复列表视图
var ReplyList = function(options) {
var opt = this.opt = $.extend({
el : '',
parent : null
},options||{});

this.parent = opt.parent;
this.$el = $(opt.el);
this.activate();
};
ReplyList.prototype = {
render : function() {
var self = this;
Reply.fetch({
page_size : 10, page_num : 1,
sourceid : self.parent.getBlogId()
})
.done(function(data) {
self.$el.html( self.$list = $.tmpl(tpl_reply_list,data) );
});
return self;
},
activate : function() {
this.$el.delegate('a.del',$.proxy(this.del,this))
}
// ...
}

// 评论编辑器视图
CommentEditor.prototype = {
activate : function() {
this.$el.delegate('a.save',$.proxy(this.save,this))
},
save : function() {
var self = this, data = { content : self.getContent(),sourceid : self.getBlogId() };
var task_r = Reply.create(data);
var task_f = Forward.create(data);
// 转发、评论同时进行
$.when(task_r,task_f).then(function(t1,t2) {
// 保存成功，更新视图或关闭
},function(data) {
// 模型验证出错，或远程服务器错误
Sys.info(data.message,data.type);
});
return self;
},
switchView : function(type) {
// 切换子视图
var view_opt = {el:this.$sublist.empty(),parent:this};
if(type === 'reply'){
$label.show();
this.$submit.val('评论');
this.sublist = new ReplyList(view_opt).render();
}else{
$label.hide();
this.$submit.val('转发');
this.sublist = new ForwardList(view_opt).render();
}
}
// ...
}

// 回复列表模板
var tpl_reply_list = '<ul class="ui-reply-list">\
{{each list}}\
<li data-id="${id}">\
<a class="name" href="/${userid}">${name}:</a>\
<p>${content}</p>\
<time pubdate>${nicetime(timestamp)}</time><a class="del" href="javascript:;">删除</a>\
</li>\
{{/each}}\
</ul>';

// var dfd = $.Deferred();
$.post('/ajax/blog/reply/create',data)
.success(function(json) {
if(json && json.ok){
dfd.resolve(json.list);
}else{
dfd.reject({message:json.message||'获取失败',type:'error'});
}
})
.fail(function() {
dfd.reject({message:'服务暂时不可用',type:'error'})
});