忽略django表单选择字段的初始值 [英] initial value for django form choice field ignored

问题描述

我有这个表单：

  class UserUsesSourceForm（forms.Form）：
＃some fields here 
 username = forms.CharField（label =（Username），max_length = 30，help_text =（Required））
 provider = forms.ChoiceField（widget = forms.Select（），choices = SOURCES_CHOICES，初始= SOURCES_CHOICES [1]）$ ​​b $ b  

可用的选项是：

  E ='e'
 A ='a'
 SOURCES_CHOICES =（
（A，'A'），
（E，'E'），
）
  

视图：

  form = UserUsesSourceForm（initial = {username：request.user.username，'provider'：SOURCES_CHOICES [1]}）return render_to_response （'update_datasource.html'，context_instance = RequestContext（request，params））
  

模板： / p>

 < form action =method =post> 
 {％csrf_token％} 
 {％if form.non_field_errors％} 
< p> 
 {％for form.non_field_errors％} 
< div class =text-error> {{error | escape}}< / div> 
 {％endfor％} 
< / p> 
 {％endif％} 
< div class =control-group> 
 
< label class =control-labelfor =id_provider>数据源< / label> 
< div class =controls> 
 {{form.provider}} 
< / div> 
< / div> 
< / form> 
  

问题是，即使初始值正确设置，我可以在debug中进行测试即，表单提供者字段的初始值是我想要的元组），最终的HTML总是显示选择框中的第一个元素：

 < select name =providerid =id_provider> 
< option value =A> A< / option> 
< option value =E> E< / option> 
< / select> 
  

..而我希望它有一个默认或活动选项。
请注意，用户名字段已正确初始化。
如何进一步调查以确定问题在哪里？

解决方案

您需要传递 form = UserUsesSourceForm（
initial = {'username'：request.user.username，
'provider'：SOURCES_CHOICES [1] [0]}）





I have this form:

class UserUsesSourceForm(forms.Form):
    # some fields here
    username = forms.CharField(label=("Username"), max_length=30, help_text = ("Required"))
    provider = forms.ChoiceField(widget=forms.Select(), choices=SOURCES_CHOICES, initial=SOURCES_CHOICES[1])

The available choices are:

E = 'e'
A = 'a'
SOURCES_CHOICES = (
                  (A, 'A'),
                  (E, 'E'),
                  )

The view:

form = UserUsesSourceForm(initial={"username":request.user.username, 'provider':SOURCES_CHOICES[1]})return render_to_response('update_datasource.html', context_instance=RequestContext(request, params))

And the template:

<form action="" method="post">
    {% csrf_token %}
    {% if form.non_field_errors %}
    <p>
        {% for error in form.non_field_errors %}
            <div class="text-error">{{ error|escape }}</div>
        {% endfor %}
    </p>
    {% endif %}
    <div class="control-group">

        <label class="control-label" for="id_provider">Data source</label>
        <div class="controls">
            {{form.provider}}
        </div>
                </div>
</form>

The problem is that even if the initial value is correctly set, and I can test it in debug (i.e., the form "provider" field initial value is the tuple I want), the final html always show the first element in the select box:

<select name="provider" id="id_provider">
<option value="A">A</option>
<option value="E">E</option>
</select>

..while I'd expect it to have a "default" or "active" option. Please note that the username field is correctly initialized. How can I investigate further to find out where the problem is?

解决方案

You need to pass the option value instead of tuple in initial data:

form = UserUsesSourceForm(
    initial={'username':request.user.username,
             'provider':SOURCES_CHOICES[1][0]})

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