php – 在等待ajax.done完成时为每个循环暂停a

我正在使用for each方法迭代一组命令文件.

对于每个命令文件,我需要等待ajax成功,然后继续执行下一个命令.

问题是for a循环在ajax代码完成之前移动到下一个命令.有人能提供解决方案吗？

对于每个循环：

$.each(cmd_files, function(index, cmd) {

          update_log('Running CMD for' + cmd)

          wait_for_cmd_complete(cmd).done(function(data){

               update_log("CMD is complete");    

          })
 })

Ajax功能：

function wait_for_cmd_complete(cmd){

     return $.ajax({
         type: 'POST',
         data: {cmd:cmd}, 
         url: 'wait_for_cmd_complete.PHP'
     });  


  }

解决方法:

这根本不是你如何编写事件驱动的动作.如果您需要下一代代码迭代才能在事件之后启动,那么您不会遍历迭代…因为那将在事件之前运行所有代码！这就是事件的运作方式.

制作类似这种通用结构的东西可以更好地在每个事件中运行1次迭代代码：

var i = 0; // the index we're using
var list = []; // array of the things you plan on "looping" through
var max = list.length; // basically how many iterations to do

function nextIteration() {
    if (i >= max) return; // end it if it's done
    // do whatever you want done before the event for this iteration
    list[i].addEventListener("someevent", onEvent); // add whatever event listener
}

function onEvent() {
    // do whatever it is you want done after the event for this iteration
    i++; // up the index
    nextIteration(); // start the next iteration
}

nextIteration(); // start the first iteration manually

为了便于说明,您可以知道发生了什么,这里的代码格式就像上面的代码一样.

var i = 0; // the index we're using
update_log('Running Cmds');
var cmd; // basically a var just so we don't have to keep calling cmd_files[i]
var totalCommands = cmd_files.length; // basically how many iterations to do

function sendNextCommand() {
    if (i >= totalCommands) return; // end it if it's done
    cmd = cmd_files[i]; // again, just so we don't have to keep calling cmd_files[i]
    update_log("Waiting for CMD " + cmd + " to complete...");
    $.ajax({type:'POST', data:{cmd:cmd}, url:'wait_for_cmd_complete.PHP'}).done(onCommandComplete);
    // above line does what needs to be done (sends to PHP) and then adds the event listener 'done'
}

function onCommandComplete(value) {
    update_log( "    CMD complete for: " + cmd);
    i++; // up the index
    sendNextCommand(); // start the next iteration
}

sendNextCommand(); // start the first iteration manually