带有WTForms的长排序下拉列表 [英] Long sorted dropdown list with WTForms

问题描述

我想创建一个按字母顺序排列的美国各州的下拉列表.我已经将状态元组转换为OrderedDict，并将其输入到WTForms SelectField中.

I'd like to create a drop-down list of the U.S. states in alphabetical order. I've converted a tuple of states into an OrderedDict and I'm feeding this into my WTForms SelectField.

import collections
import wtforms

STATE_ABBREV = ('AL', 'AK', 'AZ', 'AR', 'CA', 'CO', 'CT', 'DE', 'FL', 'GA', 
                'HI', 'ID', 'IL', 'IN', 'IO', 'KS', 'KY', 'LA', 'ME', 'MD', 
                'MA', 'MI', 'MN', 'MS', 'MO', 'MT', 'NE', 'NV', 'NH', 'NJ', 
                'NM', 'NY', 'NC', 'ND', 'OH', 'OK', 'OR', 'PA', 'RI', 'SC', 
                'SD', 'TN', 'TX', 'UT', 'VT', 'VA', 'WA', 'WV', 'WI', 'WY')

def list_to_ordered_pairs(input_list):
    ordered_pairs = collections.OrderedDict()
    for item in input_list:
        ordered_pairs[item] = item
    return ordered_pairs

state_pairs = list_to_ordered_pairs(STATE_ABBREV)

class MyForm(wtforms.Form):
    state = wtforms.SelectField(label='State', choices=state_pairs)

我的问题是出现的下拉菜单仅显示每种状态的第二个字母...

My problem is that the resulting dropdown menu shows only the second letter of each state...

如何解决此问题以显示正确的两个字母的名称?有没有更好的方法来拉动各个地理区域?

How do I fix this up to show the proper two-letter designation? And is there a better approach to pulling in various geographic regions?

推荐答案

这里有几个问题:

您的列表不是50元组的列表.

STATE_ABBREV = ('AL', 'AK', 'AZ', 'AR', 'CA', 'CO', 'CT', 'DE', 'FL', 'GA', 
                'HI', 'ID', 'IL', 'IN', 'IO', 'KS', 'KY', 'LA', 'ME', 'MD', 
                'MA', 'MI', 'MN', 'MS', 'MO', 'MT', 'NE', 'NV', 'NH', 'NJ', 
                'NM', 'NY', 'NC', 'ND', 'OH', 'OK', 'OR', 'PA', 'RI', 'SC', 
                'SD', 'TN', 'TX', 'UT', 'VT', 'VA', 'WA', 'WV', 'WI', 'WY')

如果您想要一个列表，它将类似于:

If you wanted a list, it would look something like:

STATE_ABBREV = ['AL', 'AK', 'AZ', 'AR', 'CA', 'CO', 'CT', 'DE', 'FL', 'GA', 
                'HI', 'ID', 'IL', 'IN', 'IO', 'KS', 'KY', 'LA', 'ME', 'MD', 
                'MA', 'MI', 'MN', 'MS', 'MO', 'MT', 'NE', 'NV', 'NH', 'NJ', 
                'NM', 'NY', 'NC', 'ND', 'OH', 'OK', 'OR', 'PA', 'RI', 'SC', 
                'SD', 'TN', 'TX', 'UT', 'VT', 'VA', 'WA', 'WV', 'WI', 'WY']

我不认为您的state_pairs是您认为的配对.他们是这样的对

I don't believe your state_pairs are pairs in the sense that you think they are. They are pairs like this

>>> state_pair = 'AK'
>>> abbr, state = state_pair
>>> print abbr
A
>>> print state
K
>>>

我相信您想要的state_pair看起来应该像这样:

I believe state_pair you want would look something like this:

>>> state_pair = ('AK', 'Alaska')
>>> abbr, state = state_pair
>>> print abbr
AK
>>> print state
Alaska
>>>

解决您遇到的问题的方法是摆脱方法list_to_ordere_pair并仅创建state_pairs

The solution to the problem you are seeing is to get rid of the method list_to_ordere_pair and just create a list of of state_pairs

STATE_CHOICES = [('AL', 'Alabama'),('AK','Alaska')...]

class MyForm(wtforms.Form):
    state = wtforms.SelectField(label='State', choices=STATE_CHOICES)

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