django-模板中if标签的应用
模板视图option标签+if判断
views
from django.http import HttpResponse
from django.shortcuts import render
def mycal(request):
if request.method=='POST':
x=int(request.POST['x'])
y=int(request.POST['y'])
cal=request.POST['cal']
if cal=='add':
result=x+y
elif cal=='sub':
result=x-y
elif cal=='mul':
result=x*y
elif cal=='div':
result=x/y
return render(request,'test.html',locals())
elif request.method=='GET':
return render(request,'test.html')
url配置
from django.urls import path
from . import views
urlpatterns = [
path('admin/', admin.site.urls),
path('mycal/',views.mycal)
]
test.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>测试页面计算</title>
</head>
<body>
<form action= '/mycal/' method="POST">
{% csrf_token %}
<input type="text" name='x' value={{x}}>
<select name="cal" >
<option value="add" {% if cal == 'add' %} selected{% endif %}> +加</option>
<option value="sup" {% if cal == 'sup' %} selected{% endif %}>-减</option>
<option value="mul" {% if cal == 'mul' %} selected{% endif %}>*乘</option>
<option value="div" {% if cal == 'div' %} selected{% endif %}>/除</option>
</select>
<input type="text" name="y" value={{y}}>
=<span>{{result}}</span>
</br>
<input type="submit" value='计算结果'>
</form>
</body>
</html>
网页内容显示
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>测试页面计算</title>
</head>
<body>
<form action= '/mycal/' method="POST">
<input type="hidden" name="csrfmiddlewaretoken" value="24xDImyFe8BGhoPqSU1V5bhRtf9O5ERvq2y7QfdxnmEZH62tr0BuZss6PP4yjLPm">
<input type="text" name='x' value=15>
<select name="cal" >
<option value="add" > +加</option>
<option value="sup" >-减</option>
<option value="mul" >*乘</option>
<option value="div" selected>/除</option>
</select>
<input type="text" name="y" value=20>
=<span>0.75</span>
</br>
<input type="submit" value='计算结果'>
</form>
</body>
</html>
if套用标签时：
