nk20/templates/member/profile_picture_update.html

{% extends "member/profile_detail.html" %}
{% load i18n static pretty_money django_tables2 crispy_forms_tags %}

{% block profile_content %}
<div class="row">
<div class="col-sm-4 text-center">
    <img class="img-thumbnail" alt="" src="{{user_object.note.display_image.url }}"/>
    <p class=""> {% trans "current image" %} </p>
</div>
<div class="col-sm-4 justify-content-center">
    <form class=" text-center form my-2" action="" enctype="multipart/form-data" method="post">
        {% csrf_token %}
        {{ form |crispy }}
        <button class="btn btn-primary mx-2" type="submit">
            {% trans "Change image" %}
        </button>
    </form>
</div>
<div class="col-sm-4">
    <div id="image-holder"></div>
</div>
</div>
{% endblock %}
{% block extrajavascript%}
<script>
// https://codepedia.info/upload-image-using-jquery-ajax-asp-net-c-sharp/
 $("#id_image").on('change', function () {

     //Get count of selected files
     var countFiles = $(this)[0].files.length;

     var imgPath = $(this)[0].value;
     var extn = imgPath.substring(imgPath.lastIndexOf('.') + 1).toLowerCase();
     var image_holder = $("#image-holder");
     image_holder.empty();

     if (extn == "gif" || extn == "png" || extn == "jpg" || extn == "jpeg") {
         if (typeof (FileReader) != "undefined") {

             //loop for each file selected for uploaded.
             for (var i = 0; i < countFiles; i++) {

                 var reader = new FileReader();
                 reader.onload = function (e) {
                     $("<img />", {
                         "src": e.target.result,
                         "class": "img-thumbnail"
                     }).appendTo(image_holder);
                 }

                 image_holder.show();
                 reader.readAsDataURL($(this)[0].files[i]);
             }

         } else {
             alert("{% trans 'This browser does not support FileReader.' %}");
         }
     } else {
         alert("{% trans 'Please select only images' %}");
     }
 });
</script>
{% endblock %}