Django的MTV模式和模板01

A913830

Django网站开发的mtv模式: Model(模型), Template(模板)和View(视图)。它们看似与MVC设计模式不太一致，其实本质是相同的。但是Django的View和经典的View确实有非常大的不同。- Model：与经典MVC模式下的Model差不多。是数据模型并不是数据本身- Template：与经典MVC模式下的View一致。决定了用户界面的外观- Views：负责业务逻辑，并调用Model和Template。此外还有一个路由分发器Urls，将一个个URL的页面请求分发给不同的View处理，View再调用相应的Model和Template。Urls+Views合起来使用，与经典MVC下的Controller更像
创建 templates 目录并建立 login.html文件   
<form action="/login" method="post">
        <div>username:<input type="text" name="username" value="{{name}}"></div>
        <div>password:<input type="password" name="password" value="{{password}}"></div>
        <div><input type="submit" value="login"></div>      
</form>
修改模板文件的路径 [os.path.join(BASE_DIR, 'templates')]

---

def login(request):
    if request.method == 'GET':
        from django.template import loader
        t = loader.get_template('login.html')
        html = t.render({'name':'utility','password':'123'})
        return HttpResponse(html)

---

def login(request):
    if request.method == 'GET':
        return render(request,'login.html',{'name':'bulletin'})

A913830

<p>{{s}}</p>
<p>{{lst}}</p>
<p>{{mydic}}</p>
<p>{{lst.0}}</p>
<p>{{mydic.name}}</p>

def test(request):
    s = 'hello world!'
    lst = ['A','B','C']
    mydic = {'name':'utility','gender':'male'}
    dic = {'s':s,'lst':lst,'mydic':mydic}
    return render(request,'test.html',dic)

A913830

<form action="login" method="post">
    <div>username:<input type="text" name="username" value="{{name}}"></div>
    <div>password<input type="password" name="password" value="{{password}}"></div>     
    <div><input type="submit" value="login"></div>
</form>

---

def login(request):   
    if request.method == 'GET':
       return render(request,'login.html',{'name':'bulletin'})

A913830

A913830 发表于 2021-11-13 21:09
{{s}}
{{lst}}
{{mydic}}

request.META['REMOTE_ADDR']

---

locals:the local scope 局部范围
def fx(a,b):
    c = 300
    print(locals())


fx(100,200)
{'a': 100, 'b': 200, 'c': 300}

---

def mytemp_view(request):
    s = 'utility'
    return render(request,'mytemp.html',locals())

A913830

<form action="./" method="post">
    <input type="text" name="x" value="{{x}}">
    <select id="" name="op">
        <option value="add">+</option>
        <option value="sub" {% if op == 'sub' %}selected{% endif %}>-</option>
    </select>
    <input type="text" name="y" value="{{y}}"> = <span>{{ret}}</span>
    <div><input type="submit" value="calc"></div>
</form>

---

def calc(request):
    if request.method == 'GET':
        return render(request,'calc.html',locals())
    elif request.method == 'POST':
        if request.POST['x'] == '':
            print('>>>>>>>>>')
        x = int(request.POST.get('x','10'))
        y = int(request.POST.get('y','20'))
        op = request.POST.get('op')
        if op == 'add':
            ret = x+y
        elif op == 'sub':
            ret = x-y

        return render(request,'calc.html',locals())

A913830

<div>
    <h2>s = {{s|upper}}</h2>
    <h2>s = {{s|safe}}</h2>
    <h2>n+2 = {{n|add:2}}</h2>
</div>


def filter_view(request):
    s = ' <i>hello world!</i> '
    n = 100
    return render(request,'filter.html',locals())