generate a different identifier for ajax requests avoiding the use of JSON

The AJAX request functions in the following way:

success: function(data) {
   $('#totalvotes1').text(data); 
}

However, I need it to work with unique IDs as follows:

success: function(data) { 
    $('#total_' + $(this).attr("id")). text(data); 
}

Where

<span id="total_vote_up_<?php echo $mes_id; ?>">

and

<a id="vote_up_<?php echo $mes_id1; ?>">

I am unable to identify what is wrong with the code provided. If anyone has a simple solution using JSON, I would be willing to try that approach. I have no knowledge of how JSON works, so any help debugging this code would be greatly appreciated.

In general.js:

$(".vote").click(function() 
{
    var id = $(this).attr("id");
    var name = $(this).attr("name");
    var eData = $(this).attr("data-options");
    var dataString = 'id='+ id + '&' + eData ;
    var parent = $(this);

    if(name=='up')
    {
        $(this).fadeIn(200).html('');
        $.ajax({
            type: "POST",
            url: "up.php",
            data: dataString,
            cache: false,

            success: function(data) { 
                $('#total_' + $(this).attr("id")).text(data); 
            }
        });
    }

});
});
});

In index.php

<div id="main">
<div id="left">
    vote_up_<?php echo $mes_id1; ?>
<span class='up'><a id="vote_up_<?php echo $mes_id1; ?>" class="vote" name="up" data-options="key1=<?php echo $mes_id1;?>&key2=<?php echo $mes_id2;?>&key3=<?php echo $totalvotes1;?>&key4=<?php echo $totalvotes2;?>"> <img src="up.png" alt="Down" /></a></span><br />
<span id="total_vote_up_<?php echo $mes_id1; ?>"><?php echo $totalvotes1; ?></span><br />
</div>
<div id="message">
    <?php echo $message1; ?>
</div>
<div class="clearfix"></div>
 </div>

Answer №1

Indentation and line breaks can improve your code readability.

Consider implementing the following technique:

// Prior to $.ajax call
const self = this;

// Inside success callback
$('#total_' + $(self).attr("id")).text(data);

In numerous cases, jQuery functions modify the context of "this" within the success function, rendering it inaccurate when referring to the ".vote" element. Hence, you must store a reference to the desired element (often using something like "const self = this") and employ that reference within the success function instead.

Edit:

As suggested by Matt Burland earlier, since you already have references to both the clicked element (parent) and the saved id, you can resolve this issue with a modification such as:

$('#total_' + id).text(data); 

Answer №2

$(".voting-button").on("click", function() {
    var id = $(this).data("id");
    var name = $(this).data("name");
    var eData = $(this).data("options");
    var dataString = "id=" + id + "&" + eData;
    var parent = $(this);
    
    if(name === "up") {
        $(this).fadeIn(200).html("");
        
        $.ajax({
            type: "POST",
            url: "upvote.php",
            data: dataString,
            cache: false,
            
            success: function(data) {
                $("#total_" + id).text(data);
            }
        });
    }
});

Answer №3

Improved and corrected. It is important to note that instead of continuously using $(this), it can be done once, stored in a variable, and reused. This is more efficient as it avoids the unnecessary creation of jQuery objects (which is what $(...) does).

$(".vote").click(function() 
{
    var parentElem = $(this);   //Note: calling this parent is really confusing!
    var idValue = parentElem.attr("id");
    var nameValue = parentElem.attr("name");
    var eDataValue = parentElem.data("options");
    var dataStringVal = 'id='+ idValue + '&' + eDataValue ;

    if(nameValue=='up')
    {

        parentElem.fadeIn(200).html('');
        $.ajax({
            type: "POST",
            url: "up.php",
            data: dataStringVal,
            cache: false,

            success: function(data) { $('#total_' + idValue).text(data); }

        });

    }

});

Note: The reason your original version did not work is because the this used in the AJAX callback refers to the browser window, not the element originally clicked on within the context of the .click handler.

So, how does this fix it? It utilizes closures. When you have a nested function (like your AJAX callback) inside another function, the inner function has access to all the variables defined in the outer function. Therefore, by caching the value of id in the idValue variable, it remains accessible when the AJAX callback is executed. Additionally, even if you were to click on another .vote element before the callback from the original click is called, it still remembers the correct value!

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