Jinja2中url_for()内的标签块 [英] Block tag inside url_for() in Jinja2
问题描述
我正在使用Jinja2渲染前端(而python在后端).每个页面的顶部都有一个不同的图像,如下所示:
I'm using Jinja2 to render my frontend (and python is on the backend). Each page will have a different image on its top, like this:
<header>
<img src="static/img/pic1.png">
</header>
我使用 url_for()来获取我的静态文件夹的正确路径:
I used url_for() to get the correct path of my static folder:
<header>
<img src="{{ url_for('static', filename='img/pic1.png') }}">
</header>
到目前为止,太好了.但是我想在filename参数中放置一个块,以便我可以重用代码并仅覆盖图像的名称.这就是我正在尝试的:
So far, so good. But I would like to put a block inside the filename parameter, so I can reuse the code and only overwrite the name of the image. This is what I'm trying:
<header>
<img src="{{ url_for('static', filename='{% block img %}img/pic1.png{% endblock %}') }}">
</header>
但这不起作用,这是Jinja2呈现的最终代码:
But it doesn't work, this is the final code that is rendered by Jinja2:
<header>
<img src="/static/%7B%25%20block%20img%20%25%7Dimg/pic1.png%7B%25%20endblock%20%25%7D">
</header>
如您所见,Jinja2无法将 block 标记识别为表达式并将其视为字符串.如果有效,我只能使用以下代码设置每页的图片:
As you can see, Jinja2 doesn't recognize the block tag as an expression and treats it as a string. If it worked, I would be able to set the picture of each page only using this code:
{% extends "base.html" %}
{% block img %}img/pic2.png{% endblock %}
...
有人可以帮忙吗?顺便说一句,此帖子对我没有帮助.
Could someone help, please? By the way, this post didn't help me.
推荐答案
您需要的是宏在模板中定义一种功能.请参阅以下主题 http://jinja.pocoo.org/docs/dev/templates/ >
What you need is a macro to define a kind of function in your template. See this topic in http://jinja.pocoo.org/docs/dev/templates/
{% macro header_img(name) -%}
<img src="{{ url_for('static', filename=name) }}">
{%- endmacro %}
您可以将此宏放在util模板中,并导入每页.
You can put this macro in an util template and import it in each page.
使用语法:
<header>{{ header_img("your_image.jpg") }}</header>
这篇关于Jinja2中url_for()内的标签块的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!