Jinja：null-master回退示例如何工作？ [英] Jinja: How does the null-master fallback example work?
问题描述
{％if not standalone％} {％extends'master.html '％} {％endif - ％}
<！DOCTYPE HTML PUBLIC - // W3C // DTD HTML 4.01 Transitional // EN>
< title> {％block title％}页面标题{％endblock％}< / title>
< link rel =stylesheethref =style.csstype =text / css>
{％block body％}
< p>这是网页正文。< / p>
{％endblock％}
据我所知，当standalone为true时，下面的代码：
<！DOCTYPE HTML PUBLIC - // W3C // DTD HTML 4.01 Transitional // EN>
< title> {％block title％}页面标题{％endblock％}< / title>
< link rel =stylesheethref =style.csstype =text / css>
{％block body％}
< p>这是网页正文。< / p>
{％endblock％}
当独立为false时， p>
{％if not standalone％}
<<<<< master.html的代码>>
<！DOCTYPE HTML PUBLIC - // W3C // DTD HTML 4.01 Transitional // EN>
< title> {％block title％}页面标题{％endblock％}< / title>
< link rel =stylesheethref =style.csstype =text / css>
{％block body％}
< p>这是网页正文。< / p>
{％endblock％}
这看起来很奇怪。我明显错过了一些明显的东西，这是什么东西？
模板扩展了另一个模板，只呈现子模板中具有父模板中对应部分的块。所有其他东西都被丢弃了。
所以在非独立模式下：
$ p $ {％if not standalone％}
{％只关心master.html％}
{％endif％}
{＃下面的所有内容都被忽略＃}
<！DOCTYPE HTML PUBLIC - // W3C // DTD HTML 4.01 Transitional // EN>
< title> {＃如果master有一个名为title的块， ＃}
{％block title％}页面标题{％endblock％}
{＃以下全部内容将被忽略＃}< / title>
< link rel =stylesheethref =style.csstype =text / css>
{＃如果master.html有一个名为body的块，那么这个*可能会被渲染出来。}}
{％block body％}
< p>这是页面主体。 < / p为H.
{％endblock％}
The example code from the official jinja site:
{% if not standalone %}{% extends 'master.html' %}{% endif -%}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<title>{% block title %}The Page Title{% endblock %}</title>
<link rel="stylesheet" href="style.css" type="text/css">
{% block body %}
<p>This is the page body.</p>
{% endblock %}
As I understand it, when standalone is true the following code is printed :
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<title>{% block title %}The Page Title{% endblock %}</title>
<link rel="stylesheet" href="style.css" type="text/css">
{% block body %}
<p>This is the page body.</p>
{% endblock %}
And when standalone is false, this is printed :
{% if not standalone %}
<<master.html's code>>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<title>{% block title %}The Page Title{% endblock %}</title>
<link rel="stylesheet" href="style.css" type="text/css">
{% block body %}
<p>This is the page body.</p>
{% endblock %}
This seems is very weird. I am clearly missing something obvious, what is it ?
The thing that is not immediately clear from the documentation is that when a template extends another template only the blocks in the child template that have a counterpart in the parent template(s) are rendered. Everything else is dropped.
So in non-standalone mode:
{% if not standalone %}
{% only care about blocks also in "master.html" %}
{% endif %}
{# Everything below is ignored #}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<title>{# The following will be rendered if master has a block named title. #}
{% block title %}The Page Title{% endblock %}
{# All the following will be ignored #}</title>
<link rel="stylesheet" href="style.css" type="text/css">
{# This *may* be rendered, if master.html has a block named "body" #}
{% block body %}
<p>This is the page body.</p>
{% endblock %}
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