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如何在python jinja模板中输出loop.counter？

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我希望能够将当前循环迭代输出到我的模板 .

根据文档：http://wsgiarea.pocoo.org/jinja/docs/loops.html，我正在尝试使用loop.counter变量 .

我有以下内容：

<ul>
{% for user in userlist %}
  <li>
      {{ user }} {{loop.counter}}
  </li>
      {% if loop.counter == 1 %}
          This is the First user
      {% endif %}
{% endfor %}
</ul>

虽然我的模板没有输出任何内容 . 什么是正确的语法？

python jinja2

3 回答

  • 22

    循环中的计数器变量在jinja2中称为 loop.index .

    >>> from jinja2 import Template

>>> s = "{% for element in elements %}{{loop.index}} {% endfor %}"
>>> Template(s).render(elements=["a", "b", "c", "d"])
1 2 3 4

    有关详细信息，请参阅http://jinja.pocoo.org/docs/templates/ .

    回复于
  • 267

    在for循环块中，您可以访问一些特殊变量，包括 loop.index - 但是没有 loop.counter . 来自the official docs：

    Variable    Description
loop.index  The current iteration of the loop. (1 indexed)
loop.index0 The current iteration of the loop. (0 indexed)
loop.revindex   The number of iterations from the end of the loop (1 indexed)
loop.revindex0  The number of iterations from the end of the loop (0 indexed)
loop.first  True if first iteration.
loop.last   True if last iteration.
loop.length The number of items in the sequence.
loop.cycle  A helper function to cycle between a list of sequences. See the explanation below.
loop.depth  Indicates how deep in a recursive loop the rendering currently is. Starts at level 1
loop.depth0 Indicates how deep in a recursive loop the rendering currently is. Starts at level 0
loop.previtem   The item from the previous iteration of the loop. Undefined during the first iteration.
loop.nextitem   The item from the following iteration of the loop. Undefined during the last iteration.
loop.changed(*val)  True if previously called with a different value (or not called at all).
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  • 1

    如果你正在使用django使用 forloop.counter 而不是 loop.counter

    <ul>
{% for user in userlist %}
  <li>
      {{ user }} {{forloop.counter}}
  </li>
      {% if forloop.counter == 1 %}
          This is the First user
      {% endif %}
{% endfor %}
</ul>
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