假设有一个模板
<html>
<div>Hello {{name}}!</div>
</html>
在测试它时,定义变量的值而不触及调用此模板的python代码将是有用的:
{% set name="World" %}
<html>
<div>Hello {{name}}!</div>
</html>
发布于 2018-01-17 14:48:14
可能想要带着模板标签
{% with "World" as name %}
<html>
<div>Hello {{name}}!</div>
</html>
{% endwith %}
正确的使用方法:
{% with name="World" greeting="Hello" %}
<html>
<div>{{ greeting }} {{name}}!</div>
</html>
{% endwith %}
发布于 2018-01-17 15:52:27
另一种不需要将所有内容都放在“WITH”块中的方法是创建一个自定义标记如:
class SetVarNode(template.Node):
def __init__(self, new_val, var_name):
self.new_val = new_val
self.var_name = var_name
def render(self, context):
context[self.var_name] = self.new_val
return ''
import re
@register.tag
def setvar(parser,token):
# This version uses a regular expression to parse tag contents.
try:
# Splitting by None == splitting by spaces.
tag_name, arg = token.contents.split(None, 1)
except ValueError:
raise template.TemplateSyntaxError, "%r tag requires arguments" % token.contents.split()[0]
m = re.search(r'(.*?) as (\w+)', arg)
if not m:
raise template.TemplateSyntaxError, "%r tag had invalid arguments" % tag_name
new_val, var_name = m.groups()
if not (new_val[0] == new_val[-1] and new_val[0] in ('"', "'")):
raise template.TemplateSyntaxError, "%r tag's argument should be in quotes" % tag_name
return SetVarNode(new_val[1:-1], var_name)
这将允许在模板中编写类似的内容:
{% setvar "a string" as new_template_var %}
https://stackoverflow.com/questions/-100003409
复制相似问题