jQuery GetJSON在SetTimeOut计时器内 [英] JQuery GetJSON inside SetTimeOut Timer

问题描述

任何人都可以发布示例代码，其中包含一个运行中的计时器(javascript settimeout)并进行数据检索.

Can anyone post a sample code wherein theres a running timer(javascript settimeout) and doing data retrieval..

这个计时器的基本作用是显示新消息.

basically what i this timer does is to display new messages..

myFunction(param){

//data retrieval operation
//using getJSON.. call displaydata() base on param

settimeout("myFunction()", param, 1000);

}

function displaydata(param){

//processing
alert('test')}

我应该使用getJSON吗?我认为异步调用存在问题.

Should i use getJSON? i think theres a problem with the asynchronous call..

推荐答案

我注意到有两点需要在代码中修复.

Two things I noticed you need to fix in your code.

• setTimeout()方法的参数不正确
• 您的异步getJSON调用将在下一次超时和getJSON方法的结果之间创建竞争条件.改为执行此操作:

• The setTimeout() method has some incorrect arguments
• Your asynchronous getJSON call creates a race condition between the next timeout and the result of the getJSON method. Do this instead:

.

function yourFunction(params) {  
    jQuery.getJSON("url", {data}, function(data, textStatus){
        // handle your JSON results

        // Call the timeout at the end of the AJAX response
        // This prevents your race condition
        setTimeout(function(){
            yourFunction(params);
        }, 1000);
    }
} 

setTimeout(function(){
    yourFunction(params);
}, 1000);

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