Đoạn code ví dụ upload hình ảnh tùy chỉnh lên dùng làm avatar cho người dùng WordPress:

// Dashboard profile
$(".change-avatar-form").on("click", "a", function (e) {
    e.preventDefault();
    let element = $(this),
        form = element.parent(),
        input = form.find("input"),
        avatar = form.find("img");

    input.on("change", function () {
        let files = this.files;

        if (files.length) {
            let file = files[0];

            if (file) {
                // Show loading when choose image
                avatar.attr("data-old-src", avatar.attr("src"));
                avatar.attr("src", BF_FRONTEND.spinnerUrl);

                let _URL = window.URL || window.webkitURL,
                    imageWidth = 0,
                    imageHeight = 0;

                let img = new Image();

                img.onload = function () {
                    imageWidth = this.width;
                    imageHeight = this.height;
                };

                img.src = _URL.createObjectURL(file);

                let avatarWarning = false;

                setTimeout(function () {
                    if (imageWidth !== imageHeight || imageWidth > 128) {
                        if (!avatarWarning) {
                            avatarWarning = true;
                            alert("Avatar must be a square and image size smaller than 128x128 pixels!");
                            avatar.attr("src", avatar.attr("data-old-src"));
                            return false;
                        }

                        return;
                    }

                    let Upload = function (file) {
                        this.file = file;
                    };

                    Upload.prototype.getType = function () {
                        return this.file.type;
                    };

                    Upload.prototype.getSize = function () {
                        return this.file.size;
                    };

                    Upload.prototype.getName = function () {
                        return this.file.name;
                    };

                    Upload.prototype.doUpload = function () {
                        let that = this;
                        let formData = new FormData();

                        // add assoc key values, this will be posts values
                        formData.append("file", this.file);
                        formData.append("upload_file", true);
                        formData.append("user_id", element.attr("data-user-id"));

                        $.ajax({
                            type: "POST",
                            url: BF_FRONTEND.ajaxUrl + "?action=hocwp_pxf_upload_avatar",
                            xhr: function () {
                                let myXhr = $.ajaxSettings.xhr();

                                if (myXhr.upload) {
                                    myXhr.upload.addEventListener("progress", that.progressHandling, false);
                                }

                                return myXhr;
                            },
                            success: function (response) {
                                if (response.success) {
                                    avatar.attr("src", response.data.url);
                                } else {
                                    avatar.attr("src", avatar.attr("data-old-src"));
                                }
                            },
                            error: function (error) {
                                // handle error
                            },
                            async: true,
                            data: formData,
                            cache: false,
                            contentType: false,
                            processData: false,
                            timeout: 60000
                        });
                    };

                    Upload.prototype.progressHandling = function (event) {
                        let percent = 0;
                        let position = event.loaded || event.position;
                        let total = event.total;

                        if (event.lengthComputable) {
                            percent = Math.ceil(position / total * 100);
                        }
                    };

                    let upload = new Upload(file);

                    // maby check size or type here with upload.getSize() and upload.getType()

                    // execute upload
                    upload.doUpload();
                }, 1000);
            }
        }
    });

    input.trigger("click");
});

Đoạn HTML hiển thị hình ảnh avatar:

<div class="fes-el html html_1519802597 text-center my-4">
    <div class="fes-fields">
        <div class="zf-user-avatar-field">
            <div class="change-avatar-form">
                <a href="javascript:" data-user-id="1">
                    <img decoding="async" class="avatar"
                         src="https://localhost/ldcuong/wp-content/uploads/2024/11/dailydeal-75x75.png" alt="" width="96"
                         height="96">
                </a>
                <input type="file" name="avatar_id" style="display: none" accept=".jpg, .png">
            </div>
        </div>
    </div>
</div>

Đoạn code xử lý AJAX khi người dùng chọn tải hình ảnh avatar lên:

function hocwp_pxf_upload_avatar_ajax_callback() {
    $data    = array();
    $user_id = $_POST['user_id'] ?? '';

    if ( BigFont_Object()->is_positive_number( $user_id ) ) {
        $file = $_FILES['file'] ?? '';

        if ( isset( $file['name'] ) ) {
            $upload = Pixelify()->upload_file( basename( $file['name'] ), $file['tmp_name'] );

            if ( isset( $upload['id'] ) ) {
                $data['url'] = wp_get_attachment_image_url( $upload['id'] );
                update_user_meta( $user_id, 'avatar_id', $upload['id'] );
                wp_send_json_success( $data );
            }
        }
    }

    wp_send_json_error( $data );
}

add_action( 'wp_ajax_hocwp_pxf_upload_avatar', 'hocwp_pxf_upload_avatar_ajax_callback' );

Filter để hiển thị hình ảnh avatar từ ảnh tùy chỉnh được tải lên bởi người dùng:

function hocwp_pxf_pre_get_avatar_filter( $avatar, $id_or_email, $args ) {
    $user = HP()->get_user( $id_or_email );

    if ( $user instanceof WP_User ) {
        $avatar_id = get_user_meta( $user->ID, 'avatar_id', true );

        if ( HP()->is_positive_number( $avatar_id ) && file_exists( get_attached_file( $avatar_id ) ) ) {
            $avatar = '<img class="avatar" src="' . wp_get_attachment_image_url( $avatar_id, array(
                    75,
                    75,
                    true
                ) ) . '" alt="" width="' . $args['width'] . '" height="' . $args['height'] . '">';
        }
    }

    return $avatar;
}

add_filter( 'pre_get_avatar', 'hocwp_pxf_pre_get_avatar_filter', 10, 3 );