Question

我有这段代码：

{% block vich_image_widget %}
    {% spaceless %}
        <div class="vich-image">
            {{ dump() }}
            {{ form_row(form.file) }}
            {% if form.delete is defined %}
                {{ form_row(form.delete) }}
            {% endif %}
            {{ download_uri }}
            {% if download_uri is defined and download_uri %}
                <a href="{{ download_uri }}"><img src="{{ download_uri | imagine_filter('my_thumb')}}" alt="" /></a>
            {% endif %}
            {% if show_download_link and download_uri is defined and download_uri%}
                <a href="{{ download_uri }}">{{ 'download'|trans({}, 'VichUploaderBundle') }}</a>
            {% endif %}
        </div>
    {% endspaceless %}
{% endblock %}

这给了我这个错误：

Variable "download_uri" does not exist in offerte/edit.html.twig at line 21

第21行是：{{ download_uri }}

但为什么我会收到此错误？，twig在第22行使用download_uri而没有任何问题。

Answer 1

在第22行中它仅在download_uri存在时使用，这就是为什么你在第21行得到错误它明确地说这个变量不存在，因为你没有将它传递给这个tmpl。

{% if download_uri is defined %}
{{download_uri}}
{% endif %}

Answer 2

在第21行中，您没有检查变量是否可用，因此您需要将其放在if块中：

 {% if download_uri is defined and download_uri %}
     {{ download_uri }}
     <a href="{{ download_uri }}"><img src="{{ download_uri | imagine_filter('my_thumb')}}" alt="" /></a>
 {% endif %}

也是这样：

{% if download_uri is defined and download_uri %}

应如下所示：

{% if download_uri is defined and download_uri is not empty %}

symfony 2.8和twig：未定义的变量

2 个答案: