如何连续5秒钟连续拨打ajax电话 [英] how to make ajax calls continuously for 5 seconds once

问题描述

如何连续5秒钟进行一次ajax调用.

How to make ajax calls continuously for 5 seconds once.

我已经使用了setTimeout，如下所示，

I have used setTimeout like below,

setTimeout(function()
{
    someFn();
}, 200);

但是它使用更多的数据库连接.谁能告诉我一种有效的方法来连续调用一次函数5秒钟.

But it use more db connection. Can anyone tell me an effective way to call a function continuously for 5 seconds once.

我在setTimeout或setInterval内部使用的函数将用于将值更新到数据库.因此这将增加数据库连接.并导致丢失的数据库连接错误.所以我需要一些不会增加数据库连接的东西

Function that i use inside setTimeout or setInterval will be used to update values to database.hence this will increase db connections. and result in lost db connection error.so i need something that will not increase db connections

我正在使用以下代码

push_notification('<?php echo $user_details1[0]['id']; ?>');

setInterval(function() 
{
    push_notification('<?php echo $user_details1[0]['id']; ?>');

}, 10000);


function push_notification(driver_id)
{

    var dataS = "&type=1&driver_id="+driver_id;
    var SrcPath = "<?php echo URL_BASE; ?>";
    var response;

    $.ajax
    ({          
        type: "POST",
        url: SrcPath+"driver/adminpushnotification/1", 
        data: dataS, 
        cache: false, 
        dataType: 'html',
        success: function(response) 
        {   
            //some Functionality
        }
    });
}

推荐答案

这将每interval毫秒执行一次fn，并且在duration毫秒后将停止执行.

This will execute fn every interval milliseconds, and after duration milliseconds it will stop.

var duration = 5000,
    interval = 200,
    intervalTimer;

intervalTimer = setInterval(function() {
    fn();
}, interval);

setTimeout(function() {
    clearInterval(intervalTimer);
}, duration);

更新

但是，如果您是在间隔回调中发出ajax请求，并且想要阻止在先前的请求仍处于未决状态时发出新的请求(因为我现在正在解释您的问题)，则可以检查状态提出新请求之前，先处理之前的请求.如果您使用的是jQuery，它可能看起来像这样:

Update

However, if you're making ajax requests within the interval callback, and want to prevent a new request from being made while a previous request is still pending (as I'm now interpreting your question), you can check the status of the previous request before making a new one. Providing you're using jQuery, it could look something like this:

var duration = 5000,
    interval = 200,
    xhrPending = false,
    intervalTimer;

intervalTimer = setInterval(function() {
    if (xhrPending) return;

    $.ajax(...).done(function() {
        xhrPending = false;
    });

    xhrPending = true;
}, interval);

setTimeout(function() {
    clearInterval(intervalTimer);
}, duration);

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