jQuery callback with parameters

Question

I'm trying to call a function, then take the returned variable and display it on the screen within a div. However, in my current format below, the .html() gets executed simultaneously as the postGameStatistics() function. postGameStatistics() is a function that does an ajax post amongst some other actions. Is there a way to chain this?

        var fbDiv = "#fb-request-wrapper";
        var xp = postGameStatistics(fbDiv, "#loading_fb", "p2", null);
        $(fbDiv).html("Congrats! you've just earned " + xp + " XPs.");
        $(fbDiv).show();

Execute $(fbDiv).html(...) in the postGameStatistics callback. As we don't know how postGameStatistics works, this is all we can say. — Felix Kling
– Felix Kling, Commented Jul 23, 2011 at 11:33

Alberto León · Accepted Answer · 2011-07-24 05:07:16Z

2

Two options. I think the second one is really what you want.

1) set the optional "async" property of a jQuery ajax request to false. This will make the rest of the script wait until the request has finished before proceeding. For example:

$.ajax({
    url: http://example.com,
    type: 'POST',
    async: false,
    data: myData,
    success: function(data){
        //handle a successful request
    },
    error: function(data){
        //handle a failed request
    }
});

2) Execute the second two lines of code in the "success" callback of the $.ajax method. This is the standard jQuery way to handle AJAX requests. Note that you do not need to set async to false in this case:

$.ajax({
    url: http://example.com,
    type: 'POST',
    data: myData,
    success: function(data){
        $(fbDiv).html("Congrats! you've just earned " + data + " XPs.");
        $(fbDiv).show();
    },
    error: function(data){
        //handle a failed request
    }
});

edited Jul 24, 2011 at 5:07

Alberto León

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answered Jul 23, 2011 at 11:35

maxedison

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3 Comments

Felix Kling Over a year ago

Using a synchronous request is almost always the wrong approach.

netwire Over a year ago

It works using the synchronous approach. The suggestion to embed the response message within the ajax makes sense, however, not all calls to postGameStatistics() require a response message to be posted. Since this process is always sequential, I think synchronous call would be best. Thoughts? What's the drawback?

maxedison Over a year ago

You're going to have to offer further explanation. You write that "not all calls to postGameStatistics() require a response message to be posted." But in the example code you posted, this doesn't seem to be the case. No matter what (in the example code), fbDiv displays a message about xp points. If there are times when you're posting game statistics silently (i.e. the user doesn't need to know about them), then simply don't put anything in the success callback. If the user needs to be alerted only if something goes wrong with the posting, then you can put some conditional code in the callbacks

mAu · Accepted Answer · 2011-07-23 11:36:21Z

0

You could move the $(fbDiv).html() and $(fbDiv).show() into a callback function, that get`s called after the ajax request finished successful.

So your request would look something like:

var postGameStatistics = function(div) {
    var $div = $(div);
    $.get('get/xp', {some: "parameters"}, function(response) {
        var xp = response.xp;

        $div.html("Congrats! you've just earned " + xp + " XPs.");
        $div.show();
    });
};

answered Jul 23, 2011 at 11:36

mAu

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Comments

Ventus · Accepted Answer · 2011-07-23 11:38:19Z

0

with jQuery your can use ajax() function to make ajax calls. To achieve what you want, consider using success() or cemplete() methods under ajax() function. In success() method you can fill and show your DIV element.

More can be read here: http://api.jquery.com/jQuery.ajax/

EDIT.

A little example


$.ajax({
  url: 'http://example.com/something',
  action: 'post',
  success: function( data ) {
    $(fbDiv).html("Congrats! you've just earned " + xp + " XPs.");
    $(fbDiv).show();
  }
});

answered Jul 23, 2011 at 11:38

Ventus

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