blocks|key|3343109|text|您可能实际上并不想使用块，而只是想使用一个变量：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3343110|#+base.html
<html>
++++<head>
++++++++<title>{{+title%7Cdefault:"My+Cool+Website"+}}</title>
++++</head>
++++<body>
++++++++<h1>{{+title%7Cdefault:"My+Cool+Website"+}}</h1>
++++</body>
</html>|code-block|syntax|javascript|3343111|然后通过上下文设置标题。|3343112|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>You probably don't actually want to use a block but rather to just use a variable:</p>

<pre><code># base.html
&lt;html&gt;
    &lt;head&gt;
        &lt;title&gt;{{ title|default:"My Cool Website" }}&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;h1&gt;{{ title|default:"My Cool Website" }}&lt;/h1&gt;
    &lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>You then set the title through the context.</p>


blocks|key|353900|text|有两个简单的解决方案来解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|353901|最简单的方法是将标题放入上下文变量中。您可以在视图中设置上下文变量。|353902|如果你使用的是像泛型视图这样的东西，并且没有图片、猫等的views.py，那么你可以走custom+template+tag+that+sets+a+variable+in+the+context的路。|offset|length|353903|使用此方法将使您能够执行以下操作：|353904|{%25+extends+"base.html"+%25}
{%25+load+set_page_title+%25}
{%25+page_title+"My+Pictures"+%25}
...|code-block|syntax|javascript|353905|然后在你的base.html中：|353906|...
{%25+block+title+%25}{{+page_title+}}{%25+endblock+%25}
...
<h1>{{+page_title+}}</h1>|353907|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#setting-a-variable-in-the-context^0|0|0|17|1J|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@$F|13|G|14|1|15]]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|19|8|@]|9|@]|A|$M|N]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

<p>There are two easy solutions for this.</p>

<p>The easiest is to put your title into a context variable.  You would set the context variable in your view.</p>

<p>If you are using something like generic views and don't have a views.py for pictures, cats, etc. then you can go the way of a <a href="http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#setting-a-variable-in-the-context" rel="nofollow noreferrer">custom template tag that sets a variable in the context</a>.</p>

<p>Going this route would enable you to do something like:</p>

<pre><code>{% extends "base.html" %}
{% load set_page_title %}
{% page_title "My Pictures" %}
...
</code></pre>

<p>Then in your base.html:</p>

<pre><code>...
{% block title %}{{ page_title }}{% endblock %}
...
&lt;h1&gt;{{ page_title }}&lt;/h1&gt;
</code></pre>


blocks|key|3130336|text|您可以多次使用{%25+include+subtemplate.html+%25}。它与块不同，但确实有效。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3130337|entityMap^0|7|U|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

<p>you can use <code>{% include subtemplate.html %}</code> more than once.  it's not the same as blocks, but does the trick.</p>


blocks|key|353927|text|我认为在这种情况下，使用上下文处理器是一种夸张的做法。你可以很容易地做到这一点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|353928|#base.html
<html>
++++<head>
++++++++<title>{%25+block+title+%25}My+Cool+Website{%25+endblock+%25}</title>
++++</head>
++++<body>
++++++++{%25+block+content+%25}{%25+endblock+%25}
++++</body>
</html>|code-block|syntax|javascript|353929|然后：|353930|#+blog.html
{%25+extends+'base.html'+%25}
{%25+block+content+%25}
++++<h1>{%25+block+title+%25}My+Blog{%25+endblock+%25}</h1>
++++Lorem+ipsum+here...
{%25+endblock+%25}|353931|以此类推。看起来是干的兼容的。|353932|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

<p>I think that use of the context processor is in this case an overkill. You can easily do this:</p>

<pre><code>#base.html
&lt;html&gt;
    &lt;head&gt;
        &lt;title&gt;{% block title %}My Cool Website{% endblock %}&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
        {% block content %}{% endblock %}
    &lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>and then:</p>

<pre><code># blog.html
{% extends 'base.html' %}
{% block content %}
    &lt;h1&gt;{% block title %}My Blog{% endblock %}&lt;/h1&gt;
    Lorem ipsum here...
{% endblock %}
</code></pre>

<p>and so on... Looks like DRY-compatible.</p>


blocks|key|350157|text|使用Django模板宏插件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|350158|django+(django+>=+1.4)|350159|或|350160|http://www.djangosnippets.org/snippets/363/+(django+<+1.4)|offset|length|350161|django+>=+1.4|350162|#+base.html
{%25+kwacro+title+%25}
++++{%25+block+title+%25}My+Cool+Website{%25+endblock+%25}
{%25+endkwacro+%25}

<html>
++++<head>
++++++++<title>{%25+usekwacro+title+%25}</title>
++++</head>
++++<body>
++++++++<h1>{%25+usekwacro+title+%25}</h1>
++++</body>
</html>|code-block|syntax|javascript|350163|和|350164|#+blog.html
{%25+extends+'base.html'+%25}
{%25+block+title+%25}My+Blog{%25+endblock+%25}|350165|django+<+1.4|350166|#+base.html
{%25+macro+title+%25}
++++{%25+block+title+%25}My+Cool+Website{%25+endblock+%25}
{%25+endmacro+%25}

<html>
++++<head>
++++++++<title>{%25+usemacro+title+%25}</title>
++++</head>
++++<body>
++++++++<h1>{%25+usemacro+title+%25}</h1>
++++</body>
</html>|350167|350168|#+blog.html
{%25+extends+'base.html'+%25}
{%25+block+title+%25}My+Blog{%25+endblock+%25}|350169|entityMap|0|LINK|mutability|MUTABLE|url|http://www.djangosnippets.org/snippets/363/^0|0|0|0|0|17|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1A|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1B|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|1C|8|@]|9|@$H|1D|I|1E|1|1F]]|A|$]]|$1|J|3|K|5|6|7|1G|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1H|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|1I|8|@]|9|@]|A|$]]|$1|S|3|T|5|N|7|1J|8|@]|9|@]|A|$O|P]]|$1|U|3|V|5|6|7|1K|8|@]|9|@]|A|$]]|$1|W|3|X|5|N|7|1L|8|@]|9|@]|A|$O|P]]|$1|Y|3|R|5|6|7|1M|8|@]|9|@]|A|$]]|$1|Z|3|10|5|N|7|1N|8|@]|9|@]|A|$O|P]]|$1|11|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|12|$13|$5|14|15|16|A|$17|18]]]]

<p>Use the Django template macros plugin:</p>

<p><a href="https://gist.github.com/1715202" rel="nofollow noreferrer">https://gist.github.com/1715202</a> (django >= 1.4)</p>

<p>or</p>

<p><a href="http://www.djangosnippets.org/snippets/363/" rel="nofollow noreferrer">http://www.djangosnippets.org/snippets/363/</a> (django &lt; 1.4)</p>

<h2>django >= 1.4</h2>

<pre><code># base.html
{% kwacro title %}
    {% block title %}My Cool Website{% endblock %}
{% endkwacro %}

&lt;html&gt;
    &lt;head&gt;
        &lt;title&gt;{% usekwacro title %}&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;h1&gt;{% usekwacro title %}&lt;/h1&gt;
    &lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>and</p>

<pre><code># blog.html
{% extends 'base.html' %}
{% block title %}My Blog{% endblock %}
</code></pre>

<h2>django &lt; 1.4</h2>

<pre><code># base.html
{% macro title %}
    {% block title %}My Cool Website{% endblock %}
{% endmacro %}

&lt;html&gt;
    &lt;head&gt;
        &lt;title&gt;{% usemacro title %}&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;h1&gt;{% usemacro title %}&lt;/h1&gt;
    &lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>and</p>

<pre><code># blog.html
{% extends 'base.html' %}
{% block title %}My Blog{% endblock %}
</code></pre>


blocks|key|348875|text|这是我在尝试做同样的事情时发现的一种方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|348876|#+base_helper.html
<html>
++++<head>
++++++++<title>{%25+block+_title1+%25}{%25+endblock+%25}</title>
++++</head>
++++<body>
++++++++<h1>{%25+block+_title2+%25}{%25+endblock+%25}</h1>
++++</body>
</html>


#+base.html
{%25+extends+"base_helper.html"+%25}

#+Copy+title+into+_title1+&+_title2,+using+"My+Cool Website"+as+a+default.
{%25+block+_title1 %25}{%25+block+_title2 %25}{%25+block+title+%25}My+Cool+Website{%25+endblock %25}{%25+endblock %25}{%25+endblock %25}|code-block|syntax|javascript|348877|不幸的是，它需要一个额外的文件，但不需要从视图中传递标题。|348878|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>Here's a way I discovered when trying to do the same thing myself:</p>

<pre><code># base_helper.html
&lt;html&gt;
    &lt;head&gt;
        &lt;title&gt;{% block _title1 %}{% endblock %}&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;h1&gt;{% block _title2 %}{% endblock %}&lt;/h1&gt;
    &lt;/body&gt;
&lt;/html&gt;


# base.html
{% extends "base_helper.html" %}

# Copy title into _title1 &amp; _title2, using "My Cool Website" as a default.
{% block _title1 %}{% block _title2 %}{% block title %}My Cool Website{% endblock %}{% endblock %}{% endblock %}
</code></pre>

<p>Requires an extra file unfortunately, but doesn't require you to pass the title from the view.</p>


blocks|key|3343256|text|根据Van+Gale的建议，您可以通过在templatetags.py文件中添加以下内容来创建get和set标记：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3343257|register+=+template.Library()

Stateful+=+{}
def+do_set(parser,+token):
++++_,+key+=+token.split_contents()
++++nodelist+=+parser.parse(('endset',))
++++parser.delete_first_token()++#+from+the+example+--+why?
++++return+SetStatefulNode(key,nodelist)

class+SetStatefulNode(template.Node):
++++def+__init__(self,+key,+nodes):
++++++++Stateful[key]+=+nodes
++++def+render(self,+context):
++++++++return+''
register.tag('set',+do_set)

def+do_get(parser,+token):
++++tag_name,+key+=+token.split_contents()
++++return+GetStatefulNode(key)

class+GetStatefulNode(template.Node):
++++def+__init__(self,+key):
+++++++self.key+=+key
++++def+render(self,+context):
++++++++return+''.join(+[x.render(context)+for+x+in+Stateful[self.key]]+)

register.tag('get',+do_get)|code-block|syntax|javascript|3343258|然后通过{%25+set+foo+%25}put+data+here{%25+endset+%25}在一个模板中设置值，并在另一个模板中通过{%25+get+foo+%25}获取它们。|offset|length|style|CODE|3343259|entityMap^0|0|0|4|12|1Q|D|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

<p>Building on Van Gale's suggestion, you could create get and set tags by adding the following to your templatetags.py file:</p>

<pre><code>register = template.Library()

Stateful = {}
def do_set(parser, token):
    _, key = token.split_contents()
    nodelist = parser.parse(('endset',))
    parser.delete_first_token()  # from the example -- why?
    return SetStatefulNode(key,nodelist)

class SetStatefulNode(template.Node):
    def __init__(self, key, nodes):
        Stateful[key] = nodes
    def render(self, context):
        return ''
register.tag('set', do_set)

def do_get(parser, token):
    tag_name, key = token.split_contents()
    return GetStatefulNode(key)

class GetStatefulNode(template.Node):
    def __init__(self, key):
       self.key = key
    def render(self, context):
        return ''.join( [x.render(context) for x in Stateful[self.key]] )

register.tag('get', do_get)
</code></pre>

<p>Then set values in one template via <code>{% set foo %}put data here{% endset %}</code> and get them via <code>{% get foo %}</code> in another.</p>


blocks|key|3343289|text|这里有一些讨论：http://code.djangoproject.com/ticket/4529显然拒绝了django核心团队，因为他们认为这不是一个常用的场景，但我不同意。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3343290|repeat块对此是简单而干净的实现：https://github.com/SmileyChris/django-repeatblock|3343291|模板宏是另一个，但是作者提到它没有经过仔细的测试：http://www.djangosnippets.org/snippets/363/|3343292|我使用了repeatblock。|3343293|entityMap|0|LINK|mutability|MUTABLE|url|http://code.djangoproject.com/ticket/4529|1|https://github.com/SmileyChris/django-repeatblock|2|http://www.djangosnippets.org/snippets/363/^0|8|15|0|0|J|1D|1|0|P|17|2|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|H|3|I|5|6|7|17|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]|T|$5|M|N|O|C|$P|U]]]]

<p>There are some discussion here:
<a href="http://code.djangoproject.com/ticket/4529" rel="noreferrer">http://code.djangoproject.com/ticket/4529</a>
Obviously django core team reject this ticket because they think this is not a common used scenario, however I disagree. </p>

<p>repeat block is simple and clean implementation for this: 
<a href="https://github.com/SmileyChris/django-repeatblock" rel="noreferrer">https://github.com/SmileyChris/django-repeatblock</a></p>

<p>template macros is another one, however the author mentioned it's not carefully tested:
<a href="http://www.djangosnippets.org/snippets/363/" rel="noreferrer">http://www.djangosnippets.org/snippets/363/</a></p>

<p>I used repeatblock.</p>


blocks|key|3130491|text|我也遇到了在我的模板文件中重复使用{%25+block+%25}的情况。问题是，我希望在Django条件的任何一种情况下都使用Django+{%25+block+%25}，并且我希望{%25+block+%25}可以被可能扩展当前文件的后续文件覆盖。(所以在这种情况下，我想要的绝对是一个块而不是一个变量，因为从技术上讲，我并没有重用它，它只是出现在条件的两端。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3130492|The+Problem:|offset|length|style|BOLD|3130493|下面的Django模板代码将导致模板语法错误，但我认为在条件中重用已定义的{%25+block+%25}是一个有效的“愿望”(IE，为什么Django解析器要验证条件的两端的语法，它不应该只验证TRUTHY条件吗？)|3130494|#+This+example+shows+a+{{+DEBUG+}}+conditional+that+loads+
#+++Uncompressed+JavaScript+files+if+TRUE+
#+++and+loads+Asynchronous+minified+JavaScript+files+if+FALSE.++

#+BASE.html
{%25+if+DEBUG+%25}
++++<script+src="{{MEDIA_URL}}js/flatfile.1.js"></script>
++++<script+src="{{MEDIA_URL}}js/flatfile.2.js"></script>
++++<script+src="{{MEDIA_URL}}js/flatfile.3.js"></script>
++++<script+type="text/javascript">
++++++++{%25+block+page_js+%25}
++++++++++++var+page+=+new+$site.Page();
++++++++{%25+endblock+page_js+%25}
++++</script>
{%25+else+%25}
++++<script+type="text/javascript">
++++++++//+load+in+the+PRODUCTION+VERSION+of+the+site
++++++++//+minified+and+asynchronosly+loaded
++++++++yepnope([
++++++++++++{
++++++++++++++++load+:+'{MEDIA_URL}}js/flatfiles.min.js',
++++++++++++++++wait+:+true,
++++++++++++++++complete+:+function()+{
++++++++++++++++++++{%25+block+page_js+%25}+//+NOTE+THE+PAGE_JS+BLOCK
++++++++++++++++++++++++var+page+=+new+$site.Page();
++++++++++++++++++++{%25+endblock+page_js+%25}
++++++++++++++++}
++++++++++++}
++++++++)];
++++</script>
{%25+endif+%25}

#+ABOUT.html
{%25+extends+'pages/base.html'+%25}
{%25+block+page_js+%25}
var+page+=+new+$site.Page.About();
{%25+endblock+page_js+%25}|code-block|syntax|javascript|3130495|解决方案：|3130496|您可以使用{%25+include+%25}多次有条件地插入{%25+block+%25}。这对我来说很有效，因为Django语法检查器只包含TRUTHY+{%25+include+%25}。结果如下所示：|3130497|#+partials/page.js
{%25+block+page_js+%25}
++++var+page+=+new+$site.Page();++++
{%25+endblock+%25}

#+base.html
{%25+if+DEBUG+%25}
++++<script+src="{{MEDIA_URL}}js/flatfile.1.js"></script>
++++<script+src="{{MEDIA_URL}}js/flatfile.2.js"></script>
++++<script+src="{{MEDIA_URL}}js/flatfile.3.js"></script>
++++<script+type="text/javascript">
++++++++{%25+include+'partials/page_js.html'+%25}
++++</script>
{%25+else+%25}
++++<script+type="text/javascript">
++++++++yepnope([
++++++++++++{
++++++++++++++++load+:+'{MEDIA_URL}}js/flatfiles.min.js',
++++++++++++++++wait+:+true,
++++++++++++++++complete+:+function()+{
++++++++++++++++++++{%25+include+'partials/page_js.html'+%25}
++++++++++++++++}
++++++++++++}
++++++++)];
++++</script>
{%25+endif+%25}|3130498|entityMap^0|0|0|C|0|0|0|0|5|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|T|5|L|7|16|8|@]|9|@]|A|$M|N]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

<p>I too have come across the same need for a repeated {% block %} in my template files.  The issue is that I want a Django {% block %} to be used in either case of a Django conditional, and I want the {% block %} to be over-writable by subsequent files that may extend the current file. (So in this case, what I want is definitely more of a block than a variable because I'm not technically re-using it, it just appears on either end of a conditional.</p>

<p><strong>The Problem:</strong></p>

<p>The following Django template code will result in a Template Syntax Error, but I think it's a valid "want" to have a defined {% block %} re-used in a conditional (IE, why is the Django parser validating syntax on BOTH ends of a conditional, shouldn't it only validate the TRUTHY condition?)</p>

<pre><code># This example shows a {{ DEBUG }} conditional that loads 
#   Uncompressed JavaScript files if TRUE 
#   and loads Asynchronous minified JavaScript files if FALSE.  

# BASE.html
{% if DEBUG %}
    &lt;script src="{{MEDIA_URL}}js/flatfile.1.js"&gt;&lt;/script&gt;
    &lt;script src="{{MEDIA_URL}}js/flatfile.2.js"&gt;&lt;/script&gt;
    &lt;script src="{{MEDIA_URL}}js/flatfile.3.js"&gt;&lt;/script&gt;
    &lt;script type="text/javascript"&gt;
        {% block page_js %}
            var page = new $site.Page();
        {% endblock page_js %}
    &lt;/script&gt;
{% else %}
    &lt;script type="text/javascript"&gt;
        // load in the PRODUCTION VERSION of the site
        // minified and asynchronosly loaded
        yepnope([
            {
                load : '{MEDIA_URL}}js/flatfiles.min.js',
                wait : true,
                complete : function() {
                    {% block page_js %} // NOTE THE PAGE_JS BLOCK
                        var page = new $site.Page();
                    {% endblock page_js %}
                }
            }
        )];
    &lt;/script&gt;
{% endif %}

# ABOUT.html
{% extends 'pages/base.html' %}
{% block page_js %}
var page = new $site.Page.About();
{% endblock page_js %}
</code></pre>

<p><strong>The Solution:</strong></p>

<p>You can use an {% include %} to conditionally insert a {% block %} more than once.  This worked for me because the Django syntax checker includes only the TRUTHY {% include %}.  See the result below:</p>

<pre><code># partials/page.js
{% block page_js %}
    var page = new $site.Page();    
{% endblock %}

# base.html
{% if DEBUG %}
    &lt;script src="{{MEDIA_URL}}js/flatfile.1.js"&gt;&lt;/script&gt;
    &lt;script src="{{MEDIA_URL}}js/flatfile.2.js"&gt;&lt;/script&gt;
    &lt;script src="{{MEDIA_URL}}js/flatfile.3.js"&gt;&lt;/script&gt;
    &lt;script type="text/javascript"&gt;
        {% include 'partials/page_js.html' %}
    &lt;/script&gt;
{% else %}
    &lt;script type="text/javascript"&gt;
        yepnope([
            {
                load : '{MEDIA_URL}}js/flatfiles.min.js',
                wait : true,
                complete : function() {
                    {% include 'partials/page_js.html' %}
                }
            }
        )];
    &lt;/script&gt;
{% endif %}
</code></pre>


blocks|key|3130515|text|在twig中，你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3130516|#+base.html
<html>
++++<head>
++++++++<title>{{+block('title')+}}</title>
++++</head>
++++<body>
++++++++<h1>{{+block('title')+}}</h1>
++++</body>
</html>

#+blog.html
{%25+extends+'base.html'+%25}
{%25+block+title+%25}My+Blog{%25+endblock+%25}

#+pictures.html
{%25+extends+'base.html'+%25}
{%25+block+title+%25}My+Pictures{%25+endblock+%25}

#+cats.html
{%25+extends+'base.html'+%25}
{%25+block+title+%25}My+Cats{%25+endblock+%25}|code-block|syntax|javascript|3130517|entityMap|0|LINK|mutability|MUTABLE|url|http://www.twig-project.org/^0|1|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<p>In <a href="http://www.twig-project.org" rel="nofollow">twig</a> you can make this like:</p>

<pre><code># base.html
&lt;html&gt;
    &lt;head&gt;
        &lt;title&gt;{{ block('title') }}&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;h1&gt;{{ block('title') }}&lt;/h1&gt;
    &lt;/body&gt;
&lt;/html&gt;

# blog.html
{% extends 'base.html' %}
{% block title %}My Blog{% endblock %}

# pictures.html
{% extends 'base.html' %}
{% block title %}My Pictures{% endblock %}

# cats.html
{% extends 'base.html' %}
{% block title %}My Cats{% endblock %}
</code></pre>


blocks|key|3343352|text|对于遇到这种情况的任何人来说，我已经更新了上面提到的代码片段，并将其转换为模板标签库django-宏，使宏更强大，还显式地实现了重复块模式：django-macros。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3343353|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/nalourie/django-macros^0|1Y|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<p>As an update for anyone coming across this, I've taken the snippet mentioned above and turned it into a template tag library, django-macros, makes the macros more powerful and also implements a repeated block pattern explicitly: <a href="https://github.com/nalourie/django-macros" rel="noreferrer">django-macros</a>.</p>


blocks|key|3130560|text|这是一个类似于上面的do_set和do_get模板标签答案的轻量级解决方案。Django允许您将整个模板上下文传递到一个标记中，该标记允许您定义一个全局变量。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3130561|base.html：|3130562|<!DOCTYPE+html>
<html+lang="en">
<head>
++{%25+block+head+%25}
++++<title>{{+title+}}</title>
++{%25+endblock+%25}
</head>
<body>
++<h1>{{+title+}}</h1>
</body>
</html>|code-block|syntax|javascript|3130563|page.html：|3130564|{%25+extends+"base.html"+%25}

{%25+block+head+%25}
++{%25+define+'title'+'Homepage+%7C+title'+%25}
++{{+block.super+}}
{%25+endblock+%25}|3130565|自定义标签(在这里得到了想法：https://stackoverflow.com/a/33564990/2747924)：|3130566|@register.simple_tag(takes_context=True)
def+define(context,+key,+value):
++++context.dicts[0][key]+=+value
++++return+''|3130567|此外，不要忘记{%25+load+%25}您的自定义标记或将它们添加到模板选项builtins列表中，这样您就不必在每个模板中都加载它们。这种方法的唯一限制是必须从块标记内调用{%25+define+%25}，因为子模板只呈现与父标记匹配的块标记。我不确定有没有办法解决这个问题。另外，要确保define调用在您尝试使用它之前出现。|3130568|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/33564990/2747924|1|https://docs.djangoproject.com/en/1.10/ref/templates/builtins/^0|A|6|H|6|0|0|0|0|0|F|18|0|0|0|7|A|2C|C|3U|6|Z|8|1|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1D|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1E|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1F|8|@]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|S|3|T|5|J|7|1J|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1K|8|@$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]]|D|@$9|1R|A|1S|1|1T]]|E|$]]|$1|W|3|-4|5|6|7|1U|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]|14|$5|Z|10|11|E|$12|15]]]]

<p>Here is a lightweight solution similar to the above <code>do_set</code> and <code>do_get</code> template tag answer. Django allows you to pass the entire template context into a tag which can allow you to define a global variable.</p>

<p>base.html:</p>

<pre><code>&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
  {% block head %}
    &lt;title&gt;{{ title }}&lt;/title&gt;
  {% endblock %}
&lt;/head&gt;
&lt;body&gt;
  &lt;h1&gt;{{ title }}&lt;/h1&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>page.html:</p>

<pre><code>{% extends "base.html" %}

{% block head %}
  {% define 'title' 'Homepage | title' %}
  {{ block.super }}
{% endblock %}
</code></pre>

<p>custom tag (got the idea here: <a href="https://stackoverflow.com/a/33564990/2747924">https://stackoverflow.com/a/33564990/2747924</a>):</p>

<pre><code>@register.simple_tag(takes_context=True)
def define(context, key, value):
    context.dicts[0][key] = value
    return ''
</code></pre>

<p>Also don't forget to <code>{% load %}</code> your custom tags or add them to the template options <a href="https://docs.djangoproject.com/en/1.10/ref/templates/builtins/" rel="nofollow noreferrer">builtins</a> list so you don't have to load them in every template. The only limitation to this approach is the <code>{% define %}</code> has to be called from within a block tag because child templates only render block tags that match the parent tags. Not sure if there is a way around that. Also make sure the <code>define</code> call comes before you try to use it obviously.</p>


blocks|key|3130579|text|我使用this+answer来保持东西干燥。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3130580|{%25+extends+"base.html"+%25}

{%25+with+"Entry+Title"+as+title+%25}
++++{%25+block+title+%25}{{+title+}}{%25+endblock+%25}
++++{%25+block+h1+%25}{{+title+}}{%25+endblock+%25}
{%25+endwith+%25}|code-block|syntax|javascript|3130581|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/1179976/456550^0|3|B|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<p>I use <a href="https://stackoverflow.com/a/1179976/456550">this answer</a> to keep things dry.</p>

<pre><code>{% extends "base.html" %}

{% with "Entry Title" as title %}
    {% block title %}{{ title }}{% endblock %}
    {% block h1 %}{{ title }}{% endblock %}
{% endwith %}
</code></pre>


blocks|key|3130591|text|选择的答案暗示了一种简单的解决方法，即在子模板中将一个标记包装在另一个标记中，以便为它们提供相同的值。我将其用于社交图片，如下所示。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3130592|子模板：|3130593|{%25+extends+'base.html'+%25}
...
{%25+block+meta_image+%25}
{%25+block+meta_image_secure+%25}
{%25+if+object.cover_pic+%25}
{{+object.cover_pic.url+}}
{%25+else+%25}
https://live-static.welovemicro.com/static/img/device-dark.png
{%25+endif+%25}
{%25+endblock+%25}
{%25+endblock+%25}
...|code-block|syntax|javascript|3130594|然后在父base.html中|offset|length|style|CODE|3130595|...
<meta+property="og:image"+itemprop="image"+content="{%25+block+meta_image+%25}https://live-static.welovemicro.com/static/img/device-dark.png{%25+endblock+%25}">
<meta+property="og:image:secure_url"+itemprop="image"+content="{%25+block+meta_image_secure+%25}https://live-static.welovemicro.com/static/img/device-dark.png{%25+endblock+%25}">
...|3130596|entityMap^0|0|0|0|4|9|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<p>The selected answer alludes to an easy workaround to wrap one tag inside another in the child template to give them both the same value. I use this for social images like so.</p>

<p>Child template:</p>

<pre><code>{% extends 'base.html' %}
...
{% block meta_image %}
{% block meta_image_secure %}
{% if object.cover_pic %}
{{ object.cover_pic.url }}
{% else %}
https://live-static.welovemicro.com/static/img/device-dark.png
{% endif %}
{% endblock %}
{% endblock %}
...
</code></pre>

<p>Then in the parent <code>base.html</code>:</p>

<pre><code>...
&lt;meta property="og:image" itemprop="image" content="{% block meta_image %}https://live-static.welovemicro.com/static/img/device-dark.png{% endblock %}"&gt;
&lt;meta property="og:image:secure_url" itemprop="image" content="{% block meta_image_secure %}https://live-static.welovemicro.com/static/img/device-dark.png{% endblock %}"&gt;
...
</code></pre>


<p>I want to use the same <strong>{% block %}</strong> twice in the same django template. I want this block to appear more than once in my base template:</p>

<pre><code># base.html
&lt;html&gt;
    &lt;head&gt;
        &lt;title&gt;{% block title %}My Cool Website{% endblock %}&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;h1&gt;{% block title %}My Cool Website{% endblock %}&lt;/h1&gt;
    &lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>And then extend it:</p>

<pre><code># blog.html
{% extends 'base.html' %}
{% block title %}My Blog{% endblock %}

# pictures.html
{% extends 'base.html' %}
{% block title %}My Pictures{% endblock %}

# cats.html
{% extends 'base.html' %}
{% block title %}My Cats{% endblock %}
</code></pre>

<p>I will get an exception, as Django wants the block to appear only once:</p>

<blockquote>
  <p><strong>TemplateSyntaxError at /</strong></p>
  
  <p><strong>'block' tag with name 'title' appears
  more than once</strong></p>
</blockquote>

<p>A quick and dirty solution would be duplicating the block <em>title</em> into <em>title1</em> and <em>title2</em>:</p>

<pre><code># blog.html
{% extends 'base.html' %}
{% block title1 %}My Blog{% endblock %}
{% block title2 %}My Blog{% endblock %}
</code></pre>

<p>But this is a violation of the <a href="http://docs.djangoproject.com/en/dev/misc/design-philosophies/#don-t-repeat-yourself-dry" rel="noreferrer">DRY</a> principle. It would be very difficult as I have a lot of inheriting templates, and also because I don't wanna go to hell ;-)</p>

<p>Is there any trick or work-around to this problem? How can I repeat the same block in my template, without duplicating all the code?</p>


How to repeat a "block" in a django template

Django

我想在同一个django模板中使用两次相同的块{% %}。我希望这个块在我的基本模板中出现多次：# base.html<html>    <head>        <title>{% block title %}My Cool Website{% endblock %}</title>    </head>    <...

问如何在django模板中重复“块”
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