从 Jinja 渲染模板中删除不必要的空白 [英] Remove unnecessary whitespace from Jinja rendered template

问题描述

我正在使用 curl 来观察我的网络应用程序的输出.当 Flask 和 Jinja 渲染模板时，输出中有很多不必要的空白.它似乎是通过从 Flask-WTF 和 Flask-Bootstrap 渲染各种组件来添加的.我可以使用 sed 剥离它，但是有没有办法从 Jinja 控制它?

I'm using curl to watch the output of my web app. When Flask and Jinja render templates, there's a lot of unnecessary white space in the output. It seems to be added by rendering various components from Flask-WTF and Flask-Bootstrap. I could strip this using sed, but is there a way to control this from Jinja?

推荐答案

Jinja 有多种方式控制空白.它没有美化输出的方法，您必须手动确保一切看起来不错".

Jinja has multiple ways to control whitespace. It does not have a way to prettify output, you have to manually make sure everything looks "nice".

最广泛的解决方案是在 env 上设置 trim_blocks 和 lstrip_blocks.

The broadest solution is to set trim_blocks and lstrip_blocks on the env.

app.jinja_env.trim_blocks = True
app.jinja_env.lstrip_blocks = True

如果要在文件末尾保留换行符，请设置strip_trailing_newlines = False.

If you want to keep a newline at the end of the file, set strip_trailing_newlines = False.

您可以使用控制字符来修改标签周围空白的工作方式.- 总是删除空格， + 总是保留它，覆盖该标签的 env 设置.- 字符可以放在标签的开头或结尾(或两者)以控制该方向的空格，+ 字符仅在标签的开头有意义标签.

You can use control characters to modify how the whitespace around a tag works. - always removes whitespace, + always preserves it, overriding the env settings for that tag. The - character can go at the beginning or end (or both) of a tag to control the whitespace in that direction, the + character only makes sense at the beginning of a tag.

• {%- if ... %} 去掉之前
• {%- if ... -%} 前后去除
• {%+ if ... %} 保留之前
• {%+ if ... -%} 保留之前并删除之后
• 记住 {% endif %} 是分开处理的

• {%- if ... %} strips before
• {%- if ... -%} strips before and after
• {%+ if ... %} preserves before
• {%+ if ... -%} preserves before and strips after
• remember that {% endif %} is treated separately

控制字符仅适用于您编写的模板.如果您包含模板或使用来自第 3 方的宏，那么他们编写的模板将适用于该部分.

The control characters only apply to templates you write. If you include a template or use a macro from a 3rd party, however they wrote the template will apply to that part.

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