Customize count list
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10-07-2019 - |
Question
I have this code I'm using to generate a list of records categorized into year, make, series, body style, and color for vehicles. I'd like to customize this further this way:
- for the year, I want to have only up to 2004 being individual...the rest will fall under other i.e. 2009, 2008, 2007, 2006, 2005, 2004, Other.
- for the make, I want to display the six makes with the highest popularity...there's a field in the model I'm using to assign the popularity of a make with a value of primary (highest), secondary or tertiary. The rest will fall under Other.
- For the body style and color, I want to have the items having less than 3 records falling under Other.
My code is as below:
year_count = vehicle_query.order_by(
'-common_vehicle__year__year').values('common_vehicle__year__year').
annotate(count=Count('id'))
make_count = vehicle_query.order_by(
'common_vehicle__series__model__manufacturer__manufacturer').
values('common_vehicle__series__model__manufacturer__manufacturer').
annotate(count=Count('id'))
style_count = vehicle_query.order_by(
'common_vehicle__body_style__style').values
('common_vehicle__body_style__style').annotate(count=Count('id'))
colour_count = vehicle_query.order_by(
'exterior_colour__exterior_colour').values(
'exterior_colour__exterior_colour').annotate(count=Count('id'))
Solution 2
I managed to get a solution, so I thought it'd be good to update the answer here:
In the head section I have this:
<script type="text/javascript" src="{{ MEDIA_URL }}share/jquery/jquery.min.js"></SCRIPT>
<script type="text/javascript">
(function($) {
$(document).ready(function() {
//hide the additional content under "Display More"
$("div.additional_content").hide();
$("a.more").click(function () {
//show or hide the additional content
$(this).siblings("div.additional_content").toggle();
//change the attributes and text value of the link toggle
if($(this).text() == "Display Less"){
$(this).removeClass("less");
$(this).addClass("more");
$(this).html("Display More");
}else{
$(this).removeClass("more");
$(this).addClass("less");
$(this).html("Display Less");
}
return false;
});
});
})(jQuery);
Then wherever I want to reduce the number of available options I have this:
<div class="module_wrap">
<div class="module"> {% if year_count %} <strong>{% trans "Year" %}</strong> <br />
{% for item in year_count|slice:":6" %}
<ul>
<li> <a href="/inventory/year/{{ item.common_vehicle__year__year }}/">{{ item.common_vehicle__year__year }} ({{ item.count }})</a> {% if request.session.chosen_year %} <a href="/undo_year/"><img src="{{ MEDIA_URL }}img/undo.gif" border="0" alt="Remove Year Filter" title="Remove Year Filter" /></a> {% endif %} </li>
</ul>
{% endfor %}
<div class="additional_content"> {% for item in year_count|slice:"6:" %}
<ul>
<li> <a href="/inventory/year/{{ item.common_vehicle__year__year }}/">{{ item.common_vehicle__year__year }} ({{ item.count }})</a></li>
</ul>
{% endfor %} </div>
{% if year_count|slice:"6:" %}<a href="" class="more">Display More</a><br />
{% endif %} <br />
</div>
</div>
{% endif %}
OTHER TIPS
The bulk of what you're asking would probably better be handled outside of Django and instead by client-side javascript. To be clear, you could have portions handled by Django, but it would be cleaner not doing so. There are benefits to doing it this way:
- Your Django template code stays cleaner
- It will degrade nicely
- You can later update the interface (change the javascript) and not have to worry about breaking the Django template
To handle this you could simply make a script that when given a <ul>
tag (and maybe some arguments) will render that list in the format you're asking about.
Here's a simple example using jQuery. For this example, I'm going to wrap the functionality in a using a jQuery plugin pattern.
Say your django template outputs the following...
<ul>
<li>Chevy</li>
<li>Mazda</li>
<li>Honda</li>
<li>Ford</li>
<li>BMW</li>
</ul>
jquery.showmorelist.js
(function($) {
$.fn.ShowMoreList = function(visibleItemCount) {
// Wrap parent element
var parent = $(this).wrap('<div class="show-more-list"></div>').parent();
var ul = $(this);
// Enumerate children and hide extras
var counter = 0;
$(this).children().filter('li').each(function(){
counter += 1;
if (counter > visibleItemCount) {
$(this).hide();
$(this).addClass('hidden');
}
});
// Add link and bind click
var link = $('<a href="#">> Show More</a>').click(function(){
$(ul).children().filter('.hidden').show();
});
$(parent).append(link);
}
})(jQuery);
page.html
<script type="text/javascript" src="jquery.showmorelist.js"></script>
<script type="text/javascript">
// On page load...
$(function() {
$('ul').ShowMoreList(4); // Shows only the first 4 items
});
</script>
This is a rather simple example, and it won't switch the "Show More" to "Hide More" but you should be able to figure that out from the context.