我正在尝试写一个简单的jinja2扩展将呈现 <meta>页面中带有某些属性和内容属性的标记。它看起来像这样:
from jinja2 import nodes
from jinja2.ext import Extension
class MetaExtension(Extension):
"""
returns a meta tag of key, value
>> env = jinja2.Environment(extensions=[MetaExtension])
>> env.from_string('{% meta "key", "value" %}').render()
u'<meta property="keyword" content="value" />'
"""
# we'll use it in the template with
tags = set(['meta'])
def __init__(self, environment):
super(MetaExtension, self).__init__(environment)
def parse(self, parser):
tag = parser.stream.next()
args = [parser.parse_expression()]
if parser.stream.skip_if('comma'):
args.append(parser.parse_expression())
return nodes.Output([self.call_method('_render', args)]).set_lineno(tag.lineno)
def _render(self, *args):
return '<meta property="{}" content="{}" />'.format(args[0], args[1])
meta = MetaExtension
在 flask 应用程序中使用它:
# register the extension in the app file
from flask import Flask
app = Flask(__name__)
app.jinja_env.add_extension('flask_meta.MetaExtension')
还有
<!-- use it in the template -->
<head>
{% meta "key", "value" %}
</head>
虽然标签在控制台中渲染得很好，但当我在 Flask 应用程序中使用它时，它会转义 html 并将转义标签输出到页面。所以，而不是
<meta property="keyword" content="value" />
我明白了
<meta property="key" content="value" />
我做错了什么？
最佳答案
这段代码产生...
<meta property="('this', 'that')" content="('this2', 'that2')" />
试试这个...
from jinja2 import nodes
from flask import Flask
from jinja2.ext import Extension
app = Flask(__name__)
class MetaExtension(Extension):
"""
returns a meta tag of key, value
>> env = jinja2.Environment(extensions=[MetaExtension])
>> env.from_string('{% meta "key", "value" %}').render()
u'<meta property="keyword" content="value" />'
"""
# we'll use it in the template with
tags = set(['meta'])
def __init__(self, environment):
super(MetaExtension, self).__init__(environment)
def parse(self, parser):
tag = parser.stream.next()
args = [parser.parse_expression()]
if parser.stream.skip_if('comma'):
args.append(parser.parse_expression())
return nodes.Output([self.call_method('_render', args)]).set_lineno(tag.lineno)
def _render(self, *args):
return '<meta property="{0}" content="{1}" />'.format(args[0], args[1])
meta = MetaExtension
@app.route("/")
def index():
#return 'hi'
try:
return MetaExtension._render('', ("this", 'that') , ("this2", 'that2') )
except Exception as e:
print(str(e))
app.jinja_env.add_extension(meta)
if __name__ == "__main__":
app.run()
希望这有帮助!
关于python - Jinja2 扩展输出转义的 html 而不是 html 标签，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29370542/