django 模板问题(访问列表) [英] django template question (accessing a list)
问题描述
我正在为我的第一个 django 网站编写模板.
I am writing a template for my first django website.
我将字典列表传递给变量中的模板.我还需要传递一些其他包含布尔标志的列表.(注意:所有列表的长度相同)
I am passing a list of dictionaries to the template in a variable. I also need to pass a few other lists which hold boolean flags. (Note: all lists have the same length)
模板看起来像这样:
<html>
<head><title>First page</title></head><body>
{% for item in data_tables %}
<table>
<tbody>
<tr><td colspan="15">
{% if level_one_flags[forloop.counter-1] %}
<tr><td>Premier League
{% endif %}
<tr><td>Junior league
<tr><td>Member count
{% if level_two_flags[forloop.counter-1] %}
<tr><td>Ashtano League
{% endif %}
</tbody>
</table>
{% endfor %}
</body>
</html>
我收到以下错误:
模板错误
在模板/mytemplate.html 中，错误在第 7 行无法解析剩余部分:'[forloop.counter-1]' 来自'level_one_flags[forloop.counter-1]'
In template /mytemplate.html, error at line 7 Could not parse the remainder: '[forloop.counter-1]' from 'level_one_flags[forloop.counter-1]'
我对收到此错误并不感到惊讶，因为我只是想看看是否可行.到目前为止，从文档中，我还没有找到如何通过索引(即通过枚举以外的方式)获取列表中的项目.
I am, not suprised I am getting this error, since I was just trying to see if would work. So far, from the documentation, I have not found out how to obtain the items in a list by index (i.e. other than by enumeration).
有谁知道我如何通过模板中的索引访问列表?
Does anyone know how I may access a list by index in a template?
推荐答案
您使用 点运算符来索引数组，或者，实际上，做任何事情.
You use the dot-operator to index the array, or, really, to do anything.
技术上，当模板系统遇到一个点，它会尝试以下查找，按此顺序:
Technically, when the template system encounters a dot, it tries the following lookups, in this order:
* Dictionary lookup
* Attribute lookup
* Method call
* List-index lookup
我不相信您可以对索引进行数学运算.您必须传入以其他方式构造的数组，这样您就不必进行此减法.
I don't believe you can do math on the index. You'll have to pass in your array constructed in some other way so that you don't have to do this subtraction.
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