Question

我正在尝试根据类别ID为不同的类别添加不同的模板。我正在使用Django 1.3。 Switch案例不适用于Django 1.3，我收到此错误：

Invalid block tag: 'switch', expected 'endblock' or 'endblock content'

但是开关盒已正确关闭。

这是我的代码：

{% switch property.category.id %}
        {% case 0 %}
                 <h4>'agriculture'</h4>
        {% case 1 %}
                  <h4>'Residential'</h4>
        {% case 2 %}
                  <h4>'commiercial'</h4>
        {% case 3 %}
                  <h4>'mixed use'</h4>
        {% case 4 %}
                  <h4>'Industrial'</h4>
        {% else %}
                 <h4>'retail'</h4>
{% endswitch %}

此代码中的错误是什么？

Answer 1

There is no {% switch %} tag in Django template language. To solve your problem you can

either use this Django snippet, that adds the functionality,
or re-write your code to a series of {% if %}s.

The second option in code:

{% if property.category.id == 0 %}
    <h4>'agriculture'</h4>
{% elif property.category.id == 1 %}
    <h4>'Residential'</h4>
{% elif property.category.id == 2 %}
    <h4>'commiercial'</h4>
{% elif property.category.id == 3 %}
    <h4>'mixed use'</h4>
{% elif property.category.id == 4 %}
    <h4>'Industrial'</h4>
{% else %}
    <h4>'retail'</h4>
{% endif %}

As Alasdair correctly mentioned in his comment, the {% elif %} tag was introduced in Django 1.4. To use the above code in an older version you need to upgrade your Django version or you can use a modified version:

{% if property.category.id == 0 %}
    <h4>'agriculture'</h4>
{% endif %}
{% if property.category.id == 1 %}
    <h4>'Residential'</h4>
{% endif %}
{% if property.category.id == 2 %}
    <h4>'commiercial'</h4>
{% endif %}
{% if property.category.id == 3 %}
    <h4>'mixed use'</h4>
{% endif %}
{% if property.category.id == 4 %}
    <h4>'Industrial'</h4>
{% endif %}
{% if property.category.id < 0 or property.category.id > 4 %}
    <h4>'retail'</h4>
{% endif %}

This modification is safe** (but inefficient) here since the ID can't be equal to two different integers at the same time.

** as long as you only use integers for the IDs which is probable

However I would strongly recommend upgrading to a newer Django version. Not only because of the missing {% elif %} tag but mainly for security reasons.

在Django模板中切换案例

1 个答案: