How to pass values from html to python

Question

I have a 4 buttons on first page which put me through to another page(All those 'buttons' are connected to database in mysql) and on this second page I have some data from mysql tables which I wanna display depending on what I have chosen in the first page. Right now I just display everything I have and I don't really know how to change that. I was looking for solutions but none worked.

views.py

def kategorie_list(request):

    obj = Kategorie.objects.all()
    context ={'obj': obj}
    return render(request, "kategorie/lista.html", context)

def uslugodawcy_list(request):

    obj = Uslugodawcy.objects.all()
    context ={'obj': obj}
    return render(request, "uslugodawcy/uslugodawcy_lista.html", context)

first html page

{% for Kategorie in obj %}

     <p> <a class="btn btn-primary" href="/uslugodawcy"><button type="nw" style="height: 65px; width: 170px"> <font size="4">{{Kategorie.idkategorie}} . {{Kategorie.nazwakategorii}}</font> </button> </a> </p>

{% endfor %}

second

{% for Uslugodawcy in obj %}

     <p> <a class="btn btn-primary" href="/promocje"><button type="nw" style="height: 65px; width: 170px"> <font size="4">{{Uslugodawcy.iduslugodawcy}} . {{Uslugodawcy.nazwa_uslugodawcy}} </font> </button> </a> </p>

{% endfor %}

Answer 1

There are many approaches. In outline:

1. Style a link as a button. . If the href is http://djangoserver/url?foo=bar then request.GET['foo'] will be available and equal to "bar" .

2. Make all the buttons relate to a form that you are displaying and POSTing, so all of them do a SUBMIT but have diffferent values that you can find in request.POST. <button form="form-id" type="submit" ...>

3. Use Javascript to cause clicking the button to fill in fields on the form (which may be hidden fields, so the user has no other way of changing them.