jquer之ajaxQueue简单实现

手头不是很忙，突然想到了ajax queue这个概念，之前貌似有看技术文章中提到过这个，就想着用jquery来实现一下，思想比较简单，没什么复杂的东西，就是用个array对象来做队列，维护ajax请求的顺序。下面给出代码：

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;(function($) {
    $.ajaxQueue = {
        // 管理ajax请求的队列
        requests: new Array(),
         
        // 把待发送的ajax请求加入队列
        offer: function(options) {
            var _self = this,
               // 对complete，beforeSend方法进行“劫持”，加入队列处理方法poll
               xhrOptions = $.extend({}, options, {
                   // 如果请求完成，发送下一个请求
                   complete: function(jqXHR, textStatus) {
                        if(options.complete)
                            options.complete.call(this, jqXHR, textStatus);
                        _self.poll();
                   },
                   // 如果请求被取消，继续发送下一个请求
                   beforeSend: function(jqXHR, settings) {
                       if(options.beforeSend)
                           var ret = options.beforeSend.call(this, jqXHR, settings);
                       if(ret === false) {
                           _self.poll();
                           return ret;
                       }
                   }
               });
             
            this.requests.push(xhrOptions);
             
            if(this.requests.length == 1) {
                $.ajax(xhrOptions);
            }
        },
         
        // 用FIFO方式发送ajax请求
        poll: function() {
            if(this.isEmpty()) {
                return null;   
            }
             
            var processedRequest = this.requests.shift();
            var nextRequest = this.peek();
            if(nextRequest != null) {
                $.ajax(nextRequest);
            }
             
            return processedRequest;
        },
         
        // 返回队列头部的ajax请求
        peek: function() {
            if(this.isEmpty()) {
                return null;
            }
             
            var nextRequest = this.requests[0];
            return nextRequest;
        },
         
        // 判断队列是否为空
        isEmpty: function() {
            return this.requests.length == 0;
        }
    }
})(jQuery);

使用的话就是$.ajaxQueue.offer(settings),settings的配置和jQuery文档的一致。

如果您感兴趣，可以点击我的jsFiddle share进行在线运行，修改等。最后有什么问题，欢迎提出交流 ：）

posted @ 2011-12-28 18:08  rob_2010  阅读(457)  评论(0)    收藏  举报