The manipulation of the DOM is not possible within the AJAX success function

I'm curious about the issue I am facing with changing the 'this' element on AJAX success. Despite my efforts to switch classes and add a new data attribute to the anchor tag in ajax success, it doesn't seem to be working. Interestingly, when I move the code outside of the success function, it works perfectly. I notice the live update when inspecting the element (only when the code is outside of success).

<a href="#" data-product-Id="@product.Id" class="lnkProduct">Add new product</a>

$(".lnkProduct").click(function (e) {
    e.preventDefault();

    var productId = $(this).attr('data-product-Id');

    $.ajax({
        type: "POST",
        url: "/Products/AddProduct",
        data: { productId: productId },
        dataType: "html",
        success: function (data) {
            $(this).addClass('lnkNewProduct').removeClass('lnkProduct');
            $(this).attr('data-newProduct-Id', data);
        }
    });
});
javascriptjqueryajaxasp.net-mvc

Answer №1

$(this) can result in a different context when used within the ajax success function. To address this issue, you can try the following code:

<a href="#" data-product-Id="@product.Id" class="lnkProduct">Add new product/a>

$(".lnkProduct").click(function (e) {
        e.preventDefault();
        var $this = $(this); //saving the reference of $(this) in a variable
        var productId = $(this).attr('data-product-Id');

        $.ajax({
            type: "POST",
            url: "/Products/AddProduct",
            data: { productId: productId },
            dataType: "html",
            success: function (data) {
                $this.addClass('lnkNewProduct').removeClass('lnkProduct'); //make changes here
                $this.attr('data-newProduct-Id', data); //make changes here
            }
        });
});

Answer №2

$(this) provides a different context within the success function. Therefore, instead of using this inside the success function, it is recommended to use class selector for manipulating DOM elements.

For example:

$(".lnkProduct").click(function (e) {
    e.preventDefault();

    var productId = $(this).attr('data-product-Id');
    var myanchor = $(this);
    $.ajax({
        type: "POST",
        url: "/Products/AddProduct",
        data: { productId: productId },
        dataType: "html",
        success: function (data) {
           myanchor.addClass('lnkNewProduct').removeClass('lnkProduct');
           myanchor.attr('data-newProduct-Id', data);
        }
    });
});

Answer №3

JavaScript behavior constantly changes based on how methods are called, affecting the value of this.

Experiment with the following code snippet:

$(".lnkProduct").click(function (e) {
    e.preventDefault();

    var productId = $(this).attr('data-product-Id');
    var self = $(this);
    $.ajax({
        type: "POST",
        url: "/Products/AddProduct",
        data: { productId: productId },
        dataType: "html",
        success: function (data) {
          self.addClass('lnkNewProduct').removeClass('lnkProduct');
          self.attr('data-newProduct-Id', data);
        }
    });
});

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