用于jasny文件上传的django-crispy-forms

首先,您不应该尝试使用Crispy Forms中的Layout,因为Jasny的HTML与默认的Crispy Form模板太不一样了.首先,我们创建一个与Jasny一起使用的Crispy Form模板.这基本上只是使用Jasny HTML更新的field.html模板.

file_field.html：

{# Custom Crispy Forms template for rendering an image field. #}
{% load crispy_forms_field %}

{% if field.is_hidden %}
    {{ field }}
{% else %}
    {% if field|is_checkbox %}
        <div class="form-group">
        {% if label_class %}
            <div class="controls col-{{ bootstrap_device_type }}-offset-{{ label_size }} {{ field_class }}">
        {% endif %}
    {% endif %}
    <{% if tag %}{{ tag }}{% else %}div{% endif %} id="div_{{ field.auto_id }}" {% if not field|is_checkbox %}class="form-group{% else %}class="checkbox{% endif %}{% if wrapper_class %} {{ wrapper_class }}{% endif %}{% if form_show_errors%}{% if field.errors %} has-error{% endif %}{% endif %}{% if field.css_classes %} {{ field.css_classes }}{% endif %}">
        {% if field.label and not field|is_checkbox and form_show_labels %}
            <label for="{{ field.id_for_label }}" class="control-label {{ label_class }}{% if field.field.required %} requiredField{% endif %}">
                {{ field.label|safe }}{% if field.field.required %}<span class="asteriskField">*</span>{% endif %}
            </label>
        {% endif %}

        {% if field|is_checkboxselectmultiple %}
            {% include 'bootstrap3/layout/checkboxselectmultiple.html' %}
        {% endif %}

        {% if field|is_radioselect %}
            {% include 'bootstrap3/layout/radioselect.html' %}
        {% endif %}

        {% if not field|is_checkboxselectmultiple and not field|is_radioselect %}
            {% if field|is_checkbox and form_show_labels %}
                <label for="{{ field.id_for_label }}" class="{% if field.field.required %} requiredField{% endif %}">
                    {% crispy_field field %}
                    {{ field.label|safe }}
                    {% include 'bootstrap3/layout/help_text_and_errors.html' %}
                </label>
            {% else %}
                <div class="controls {{ field_class }}">
                  <div class="fileinput fileinput-{% if field.value and field.value.url %}exists{% else %}new{% endif %}" data-provides="fileinput">
                    <div class="fileinput-new thumbnail" style="width: 200px; height: 150px;">
                      <img src="holder.js/100%x100%" alt="100%x100%" src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxOTAiIGhlaWdodD0iMTQwIj48cmVjdCB3aWR0aD0iMTkwIiBoZWlnaHQ9IjE0MCIgZmlsbD0iI2VlZSIvPjx0ZXh0IHRleHQtYW5jaG9yPSJtaWRkbGUiIHg9Ijk1IiB5PSI3MCIgc3R5bGU9ImZpbGw6I2FhYTtmb250LXdlaWdodDpib2xkO2ZvbnQtc2l6ZToxMnB4O2ZvbnQtZmFtaWx5OkFyaWFsLEhlbHZldGljYSxzYW5zLXNlcmlmO2RvbWluYW50LWJhc2VsaW5lOmNlbnRyYWwiPjE5MHgxNDA8L3RleHQ+PC9zdmc+" style="height: 100%; width: 100%; display: block;">
                    </div>
                    <div class="fileinput-preview fileinput-exists thumbnail" style="max-width: 200px; max-height: 150px; line-height: 10px;">
                      {% if field.value and field.value.url %}
                      <img src="{{ field.value.url }}">
                      {% endif %}
                    </div>
                    {# imgfileinput,imgselect,imremove used for removing image #}
                    <div id="imgfileinput">
                      <span id="imgselect" class="btn btn-default btn-file">
                        <span class="fileinput-new">Select image</span>
                        <span class="fileinput-exists">Change</span>
                        <input id="imgfile" type="file" name="{{ field.name }}">
                      </span>&nbsp
                      <a id="imgremove" href="#" class="btn btn-default fileinput-exists" data-dismiss="fileinput">Remove</a>
                    </div>
                  </div>

                    {# removed {% crispy_field field %} #}
                    {% include 'bootstrap3/layout/help_text_and_errors.html' %}
                </div>
            {% endif %}
        {% endif %}
    </{% if tag %}{{ tag }}{% else %}div{% endif %}>
    {% if field|is_checkbox %}
        {% if label_class %}
            </div>
        {% endif %}
        </div>
    {% endif %}
{% endif %}

其次,在为表单定义布局时引用模板：

from crispy_forms.layout import Layout,Fieldset,Div,Submit,Reset,HTML,Field,Hidden
class UserForm(forms.ModelForm):
    def __init__(self,*args,**kwargs):
        super(UserForm,self).__init__(*args,**kwargs)
        self.helper = FormHelper()
        self.helper.layout = Layout(
            Field('avatar',template='file_field.html'),'username','first_name','last_name',)

第三,默认情况下,没有办法轻松清除Jasny和Django的图像.您可以找到Jasny行为here的摘要.基本上Jasny提交None或空字符串,具体取决于图像是否未更新或删除. Django将这两个解释为图像未更新,而不是图像被删除.

Django使用ClearableFileInput小部件添加一个复选框,如果要删除文件,应该选中该复选框.为了模仿这个功能,我在添加删除按钮时添加了一些jQuery来添加此输入,并在选择更改或插入按钮时删除输入：

<script>
  // Allow image to be deleted
  $('#imgremove').on('click',function() {
  field_name = $('#imgfile')[0].getAttribute('name');
    $('#imgfileinput').append('<input id="imgclear" type="hidden" name="'+field_name+'-clear" value="on">');
  })
  $('#imgselect').on('click',function() {
    $('#imgclear').remove();
  })
</script>

你会注意到我上面的Jasny HTML已被略微修改,以包含感兴趣的标签的id,以便更容易选择.

看似很多工作,但一旦完成,它就像普通的脆形一样容易使用.