Django 检查复选框是否被选中 [英] Django check if checkbox is selected

问题描述

我目前正在处理一个相当简单的 django 项目，可以使用一些帮助.它只是一个简单的数据库查询前端.

I'm currently working on a fairly simple django project and could use some help. Its just a simple database query front end.

目前我坚持使用复选框、单选按钮等来优化搜索

Currently I am stuck on refining the search using checkboxes, radio buttons etc

我遇到的问题是弄清楚如何知道何时选择了一个(或多个)复选框.到目前为止，我的代码是这样的:

The issue I'm having is figuring out how to know when a checkbox (or multiple) is selected. My code so far is as such:

views.py

def search(request):
    if 'q' in request.GET:
        q = request.GET['q']
        if not q:
            error = True;
        elif len(q) > 22:
            error = True;
        else:           
            sequence = Targets.objects.filter(gene__icontains=q)
            request.session[key] = pickle.dumps(sequence.query)
            return render(request, 'result.html', {'sequence' : sequence, 'query' : q, 'error' : False})    
    return render(request, 'search.html', {'error': True})

搜索.html

<p>This is a test site</p></center>

        <hr>
        <center>
            {% if error == true %}
                <p><font color="red">Please enter a valid search term</p>
            {% endif %}
         <form action="" method="get">
            <input type="text" name="q">
            <input type="submit" value="Search"><br>            
         </form>
         <form action="" method="post">
            <input type='radio' name='locationbox' id='l_box1'> Display Location
            <input type='radio' name='displaybox' id='d_box2'> Display Direction
         </form>
        </center>

我目前的想法是检查选中了哪些复选框/单选按钮，并根据哪些选择了正确的数据并将其显示在表格中.

My current idea is that I check which checkboxes/radio buttons are selected and depending which are, the right data will be queried and displayed in a table.

具体来说:如何检查特定复选框是否被选中?以及如何将这些信息传递到 views.py

So specifically: How do I check if specific check-boxes are checked? and how do I pass this information onto views.py

推荐答案

单选按钮:

在单选按钮的 HTML 中，您需要所有相关的单选输入共享相同的名称，具有预定义的值"属性，并且最好有一个环绕的标签标签，如下所示:

In the HTML for your radio buttons, you need all related radio inputs to share the same name, have a predefined "value" attribute, and optimally, have a surrounding label tag, like this:

<form action="" method="post">
    <label for="l_box1"><input type="radio" name="display_type" value="locationbox" id="l_box1">Display Location</label>
    <label for="d_box2"><input type="radio" name="display_type" value="displaybox" id="d_box2"> Display Direction</label>
</form>

然后在您的视图中，您可以通过检查 POST 数据中的共享名称"属性来查找选择了哪个.它的值将是 HTML 输入标签的关联值"属性:

Then in your view, you can look up which was selected by checking for the shared "name" attribute in the POST data. It's value will be the associated "value" attribute of the HTML input tag:

# views.py
def my_view(request):
    ...
    if request.method == "POST":
        display_type = request.POST.get("display_type", None)
        if display_type in ["locationbox", "displaybox"]:
            # Handle whichever was selected here
            # But, this is not the best way to do it.  See below...

这可行，但需要手动检查.最好先创建一个 Django 表单.然后 Django 会为你做这些检查:

That works, but it requires manual checks. It's better to create a Django form first. Then Django will do those checks for you:

forms.py:

from django import forms

DISPLAY_CHOICES = (
    ("locationbox", "Display Location"),
    ("displaybox", "Display Direction")
)

class MyForm(forms.Form):
    display_type = forms.ChoiceField(widget=forms.RadioSelect, choices=DISPLAY_CHOICES)

your_template.html:

your_template.html:

<form action="" method="post">
    {# This will display the radio button HTML for you #}
    {{ form.as_p }}
    {# You'll need a submit button or similar here to actually send the form #}
</form>

views.py:

from .forms import MyForm
from django.shortcuts import render

def my_view(request):
    ...
    form = MyForm(request.POST or None)
    if request.method == "POST":
        # Have Django validate the form for you
        if form.is_valid():
            # The "display_type" key is now guaranteed to exist and
            # guaranteed to be "displaybox" or "locationbox"
            display_type = request.POST["display_type"]
            ...
    # This will display the blank form for a GET request
    # or show the errors on a POSTed form that was invalid
    return render(request, 'your_template.html', {'form': form})

复选框:

复选框的工作方式如下:

Checkboxes work like this:

forms.py:

class MyForm(forms.Form):
    # For BooleanFields, required=False means that Django's validation
    # will accept a checked or unchecked value, while required=True
    # will validate that the user MUST check the box.
    something_truthy = forms.BooleanField(required=False)

views.py:

def my_view(request):
    ...
    form = MyForm(request.POST or None)
    if request.method == "POST":
        if form.is_valid():
            ...
            if request.POST["something_truthy"]:
                # Checkbox was checked
                ...

进一步阅读:

https://docs.djangoproject.com/en/1.8/ref/forms/字段/#choicefield

https://docs.djangoproject.com/en/1.8/ref/forms/小部件/#radioselect

https://docs.djangoproject.com/en/1.8/ref/forms/字段/#booleanfield

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