Label use {%}
Annotation statement: {#}
for loop:
views.py:
from django.shortcuts import render, redirect, HttpResponse
from app01 import models
# Filter test
def filter_test(request):
hobby = ["Reading", "Basketball", "Movie", "Music"]
return render(request, "filter_test.html", {"hobby_list": hobby,})
filter_test.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Filter test</title>
</head>
<body>
{% for hobby in hobby_list %}
{{ hobby }}
{% endfor %}
</body>
</html>
Operation results:
Other uses of the for cycle:
| forloop.counter | The index value of the current loop, starting from 1 |
| forloop.counter0 | Index values for the current loop, starting at 0 |
| forloop.revcounter | The inverted index value of the current loop, starting from 1 |
| forloop.revcounter0 | The inverted index value of the current loop, starting at 0 |
| forloop.first | Is the current loop the first, resulting in Boolean values? |
| forloop.last | Is the current loop the last, resulting in a Boolean value |
| forloop.parentloop | The outer cycle of the underlying cycle |
empty:
If the content is empty, it is executed with for recycling
views.py:
from django.shortcuts import render, redirect, HttpResponse
from app01 import models
# Filter test
def filter_test(request):
hobby = []
return render(request, "filter_test.html", {"hobby_list": hobby,})
filter_test.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Filter test</title>
</head>
<body>
{% for hobby in hobby_list %}
{{ hobby }}
{% empty %}
<li>Nothing at all</li>
{% endfor %}
</body>
</html>
Operation results:
if statement:
if statement support==,>,<,!=,<=,>=, and, or, in, not, is, is not judgement
views.py:
from django.shortcuts import render, redirect, HttpResponse
from app01 import models
# Filter test
def filter_test(request):
hobby = ["Reading", "Basketball", "Movie", "Music"]
return render(request, "filter_test.html", {"hobby_list": hobby,})
filter_test.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Filter test</title>
</head>
<body>
{% if hobby_list|length != 5 %}
<p>List length is not equal to 5</p>
{% else %}
<p>List length equals 5</p>
{% endif %}
</body>
</html>
Operation results:
with statement:
Used to define an intermediate variable, often to alias a complex variable.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Filter test</title>
</head>
<body>
{% with a=hobby_list.1 %}
{{ a }}
{% endwith %}
<!-- perhaps -->
{% with hobby_list.0 as b %}
{{ b }}
{% endwith %}
</body>
</html>
Operation results:
Note: No spaces can be added on either side of "="