There was a task to submit form with ajax, with server side validation of course. Obvious solution is to do validation and return json with erros.
I didn't like idea of writing separate view for validation and then inserting errors in form html on client side. Especially since I already had a generic template for django form with errors display.
Task
User will see process like this:
- User clicks 'edit' near article block
- article is replaced with form
- in case there are validation errors - they are shown above the form fields
- in case there are no errors - form is replaced by article html
Solution
Server will return piece of html that will replace part of page with article or form (with errors if needed). Actually this sentence is the most important part of this blog post. Implementation is very simple and straightforward.
Well actually the fact that you can return parts of html from server is also not new idea at all. It's just only now I finally understood that using this technique you can create more complicated things than modal window or tabs.
Implementation
views.py
def edit_new(request, new_id):
new = get_object_or_404(MyModel, pk=new_id)
if request.method == 'POST':
form = NewsForm(request.POST, instance=new)
if form.is_valid():
new = form.save()
return render_to_response('include/new.html', dict(new=new))
else:
form = NewsForm(instance=new)
return render_to_response('include/form.html', dict(form=form, new=new))form.html
This html will replace article block on 'edit' button click. Javascript should be moved to separate file of course.
<script type="text/javascript">
function submitAndLoad(input) {
$.ajax({
url: "{% url edit_new new.id %}",
data: $(input).parent().serialize(), // форма
type: "post",
dataType: "html",
success: function(data) {
$(input).parent().parent().html(data); // article block
}
});
return false;
};
</script>
<form>
{{ form }}
<input type="submit" value="Save" onclick="return submitAndLoad(this);"/>
</form>news_list.html
<script type="text/javascript">
function editNew(id) {
$("#new-" + id).load("{% url edit_new new.id %}");
return false;
}
</script>
<!-- ... -->
<div id="new-{{ new.id }}">
{% include "news/new.html" %}
</div>
<a onclick="return editNew({{ new.id }});" href="#">Edit</a>Code can be cleaned up of course, I just wanted to show the idea.
Update
I'm translating this article almost five years after it was originally written and of course now it seems very childish :) Now we have angular and ajax forms are implemented a little differently. Still this old solution is not all that bad. I'd still replace one thing here - it's better to return json with html from server instead of just html.
Subscribe for the news and updates
Web development has undergone significant changes over the past five years due to a combination of technological advancements and changing user needs. Let's look at the drivers of these changes and the key technologies that have played a decisive role.
Nowadays, when every second large company has developed its own instant messenger, in the era of iMessages, Slack, Hipchat, Messager, Google Allo, Zulip and others, I will tell you how to keep up with the trend and write your own chat, using django-channels 0.17.3, django 1.10.x, python 3.5.x.
In this article we will tell you about the basics of working with GraphQL in Angular 2 environment with detailed example.
GraphQL is a very powerful library, which is not difficult to understand. GraphQL will help to write simple and clear REST API to suit every taste and meet any requirements.
In this article, we will describe some useful scripts and directives we use with angular form validation in our projects.
When we use css-sprites it's important to make browser cache them for longest period possible. On other hand, we need to refresh them when they are updated. This is especially visible when all icons are stored in single sprite. When it's outdated - entire site becomes ugly.