Question

在我的Django＆lt; model> model.py 中，我有以下条目：

class Method1(models.Model):
    clustering_method_param     = models.CharField(max_length=20,
         default='ward', blank=True, choices=(
         ('complete', 'Complete linkage'),
         ('average','Average linkage'),
         ('ward','Ward'),))

    distance_method_param     = models.CharField(max_length=20, blank=True,
            default='euclidean', choices=(
           ('euclidean', 'Euclidean'),
          ('manhattan','Manhattan'),
          ('pearsond','Pearson Correlation'),))

后面以HTML格式呈现：

我想要做的是设置条件。即，聚类方法ward只能应用距离度量euclidean。如果用户将所有其他距离度量传递给ward，则应返回错误消息。我怎样才能在Django中应用它？或者我应该使用JavaScript吗？

以下是HTML代码的示例：

＆＃13;

<!DOCTYPE html>
<html>
  <head>
  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
  <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
  <script src="http://gregpike.net/demos/bootstrap-file-input/bootstrap.file-input.js"></script>
   <meta charset="utf-8">
  </head>


<body>
   <form  id="id-method1Form" class="form-horizontal" method="post" > <input type='hidden' name='csrfmiddlewaretoken' value='vr5MftcSxGGUeIOwKioeUlalXJdXNgkl' /> <div id="div_id_clustering_method_param" class="form-group"> <label for="id_clustering_method_param" class="control-label col-lg-2">
                Clustering method
            </label> <div class="controls col-lg-8"> <select class="select form-control" id="id_clustering_method_param" name="clustering_method_param">

<option value="complete">Complete linkage</option>
<option value="average">Average linkage</option>
<option value="ward" selected="selected">Ward</option>
</select> </div> </div> <div id="div_id_distance_method_param" class="form-group"> <label for="id_distance_method_param" class="control-label col-lg-2">
                Distance measure
            </label> <div class="controls col-lg-8"> <select class="select form-control" id="id_distance_method_param" name="distance_method_param">
   
<option value="euclidean" selected="selected">Euclidean</option>
<option value="manhattan">Manhattan</option>
<option value="pearsond">Pearson Correlation</option>
</select> </div> </div>  <div class="form-group"> <div class="aab controls col-lg-2"></div> <div class="controls col-lg-8"> <input type="submit"
    name="submit"
    value="Submit"
    
        class="btn btn-primary"
        id="submit-id-submit"
    
    
    /> </div> </div> </form>

    <!--- END FORM DISPLAY-->
</body>
<html>

＆＃13;

Answer 1

使用JavaScript和Ajax是一个经过验证的解决方案。您可以在第一个下拉列表中收听用户选择，然后根据通过ajax的响应显示第二个下拉列表。

Answer 2

对于用户体验＆＃39;，我认为您需要根据所选的clustering_method_param编写一个javascript来更改所有距离。

但是，如果你只想阻止＆＃39;这对django。您可以编写表单验证，如下所示：

def clean(self):
    cleaned_data = self.cleaned_data
    clustering_method_param = cleaned_data.get('clustering_method_param', None)
    distance_method_param = cleaned_data.get('distance_method_param', None)

    if clustering_method_param == 'ward':
        if distance_method_param != 'euclidean':
            self.errors.update(
                {
                    'distance_method_param': [u'It should be euclidean.']
                }
            )
    return cleaned_data

在Django CharFields交互中应用条件

2 个答案: