如何检查symfony2表单中是否存在字段？

Using this manual, I added dynamic field to my form. Now, how can I check existence of this field in my template?

使用本手册，我在表单中添加了动态字段。现在，我如何在模板中检查此字段的存在？

{{ form_start(form) }}
  {{ form_errors(form) }}

  {% if ??? %}     <---------------------------
    {{ form_row(form.myDynamicField) }}
  {% endif %}
{{ form_end(form) }}

3 个解决方案

#1

What about,

关于什么，

{% if form.myDynamicField is defined %}
    {{ form_row(form.myDynamicField) }}
{% endif %}

You may also need to check if form.myDynamicField is not null.

您可能还需要检查form.myDynamicField是否为null。

#2

I know this question is a few years old, but you could also make it a shorter ternary operator.

我知道这个问题已经有几年了，但你也可以把它变成一个更短的三元运算符。

{{ form.myDynamicField is defined ? form_row(form.myDynamicField) : null }}

#3

{{ form_start(form) }}
  {{ form_errors(form) }}

  {% if form.getChildren['myDynamicField'] is defined %}
    {{ form_row(form.myDynamicField) }}
  {% endif %}
{{ form_end(form) }}

#1