Flask + Jinja:将数据传递到基本模板/所有模板 [英] Flask + Jinja: Pass Data to a Base Template/All Templates

问题描述

我有一个方法可以返回我的基本模板(全局页脚的内容)中所需的数据.

I have a method that returns data which is needed in my base template (content for a global footer).

如何 (1) 将变量传递到基本模板(其他模板扩展)或 (2) 将变量全局传递给所有模板，而无需在对 render_template 的调用中显式添加它?

How do either (1) pass a variable into the base template (which other templates extend) or (2) pass a variable to all templates globally without explicitly adding it in a call to render_template?

推荐答案

来自flask 文档:Flask 的上下文处理器

From flask docs: Flask's Context Processors

要自动将新变量注入模板的上下文中，Flask 中存在上下文处理器.上下文处理器在模板被渲染并能够将新值注入模板上下文.上下文处理器是一个函数，它返回一个字典.然后合并此字典的键和值使用模板上下文，对于应用中的所有模板:

To inject new variables automatically into the context of a template, context processors exist in Flask. Context processors run before the template is rendered and have the ability to inject new values into the template context. A context processor is a function that returns a dictionary. The keys and values of this dictionary are then merged with the template context, for all templates in the app:

来自文档的示例:

@app.context_processor
def inject_user():
    return dict(user=g.user)

请注意，此示例使用了 g 变量，该变量已可在模板中访问.

Note that this example uses the g variable, which is already accessible in templates.

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