Loop php with javascript cannot get the right order of result

Question

for(var i=0; i<participantNum; i++){
    studentID = $('#txtID'+(i+1)).val();
    alert(studentID);
    //my php function call it's work normally request(php,paramiter,cb)
    request("http://localhost/lastOrientation/2_registerValidate.php","studentID="+studentID,validateID);
}

I get value from each textbox by for loop and CALL php script to validate the student id

but the result come out randomly it's not arrange by order that it increment from for loop

,by the way all result come out. I know that it is because ajax request but can you advise

me how to get the result order in the way for loop does.

Thank in advance

sorry for my language.

Could you post the output you're getting, and the expected output? — Amal
– Amal, Commented Aug 8, 2013 at 6:17
it looks like request uses ajax... if yes it is asynchronous.. that is the reason for the behaviour — Arun P Johny
– Arun P Johny, Commented Aug 8, 2013 at 6:17

Arun P Johny · Accepted Answer · 2013-08-08 06:26:26Z

2

It looks like the request method is doing an ajax request to serve the request, if yes ajax requests are asynchronous in nature means you cannot predict when the callback will get executed or which request will get completed soon. It depends on network speed as well the server speed on serving the request.

a possible solution will be is to queue the requests like

function x(i, limit){
    if(i >= limit){
        return;
    }
    studentID = $('#txtID'+(i+1)).val();
    alert(studentID);
    //my php function call it's work normally request(php,paramiter,cb)
    request("http://localhost/lastOrientation/2_registerValidate.php","studentID="+studentID,validateID).complete(function(){
        x(i + 1, participantNum)
    });
}

x(0, participantNum);

function request(){
    return $.ajax(...)
}

answered Aug 8, 2013 at 6:26

Arun P Johny

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1 Comment

Jongz Puangput Over a year ago

Yes!! Thank you for guiding the idea I have change a little bit to suit my code but this absolutely the way I want Thank @Arun P Johny

Vytautas Butkus · Accepted Answer · 2013-08-08 06:19:28Z

0

It is probably because of latency between your requests to server. When first requests starts it might take longer than the second one and return result only after the second, third or other requests comes back. If you really want to keep an order you either should keep some record of which request is which when it returns result or you should make your request synchronous (I would not recommend the latter option).

answered Aug 8, 2013 at 6:19

Vytautas Butkus

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Bindiya Patoliya · Accepted Answer · 2013-08-08 06:23:55Z

0

May it will solve the issue

 async   : false,

in your ajax code

answered Aug 8, 2013 at 6:23

Bindiya Patoliya

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1 Comment

gmo Over a year ago

But don't forget what this implies: Cross-domain requests and dataType: "jsonp" requests do not support synchronous operation. Note that synchronous requests may temporarily lock the browser, disabling any actions while the request is active. jQuery.ajax

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