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tornado总结4-html模板使用2_html/css_WEB-ITnose

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Jun 24, 2016 am 11:18 AM

参考地址

http://www.tornadoweb.org/en/stable/guide/templates.html?highlight=render#ui-modules

目的说明

osc的所有页面顶部都有这个导航条, 我们可以使用tornado的UI modules来实现导航条,实现代码的复用.

代码结构

增加了一个my_uimodules.py,里面包含了供tornado模板使用的uimodules,增加了一个header.html里面是导航条的html代码,增加了一个page2.py,返回简单的html页面page2.html.

实际运行效果

访问路径 "/"时的效果

点击导航链接 "页面1"的效果

点击导航链接 "页面2"的效果

代码说明

my_uimodules.py

import tornado.webclass HeaderBar(tornado.web.UIModule):    def render(self, location):        return self.render_string("header.html", location=location)class HeaderBar2(tornado.web.UIModule):    def render(self, location):        return self.render_string("header.html", location=location)

所有的模板驱动都继承自 tornado.web.UIModule , 然后调用render_string调用指定的模板和参数. 你可以在此处写一个顶部导航栏再写个侧边导航栏. 我只在这里写了一个顶部导航模板驱动. 它接受一个参数location, 我把它作为导航栏最右侧的页面说明. 本模板驱动返回的是header.html,并把location传给了它.

header.html

<div>    <a href="/">主页</a>    <a href="/page1">页面1</a>    <a href="/page2">页面2</a>    <span>你现在处于页面 {{ location }}</span></div>

本模板文件作为页面的顶部导航栏,并通过location参数得到当前的页面地址

main.py

import osimport tornado.httpserverimport tornado.ioloopimport tornado.webimport my_uimodulesfrom handlers.home import HomeHandlerfrom handlers.page1 import Page1Handlerfrom handlers.page2 import Page2Handlerclass PageNotFoundHandler(tornado.web.RequestHandler):    def get(self):        return self.write_error(404)class Application(tornado.web.Application):    def __init__(self):        handlers = [            (r"/", tornado.web.RedirectHandler, {"url": "/home"}),            (r"/home", HomeHandler),            (r"/page1", Page1Handler),            (r"/page2", Page2Handler),            (r".*", PageNotFoundHandler),        ]        settings = dict(            static_path= os.path.join(os.path.dirname(__file__), "static"),            template_path=os.path.join(os.path.dirname(__file__), "templates"),            ui_modules=my_uimodules,        )        tornado.web.Application.__init__(self, handlers, **settings)if __name__ == "__main__":    port = 8899    application = Application()    http_server = tornado.httpserver.HTTPServer(application, xheaders=True)    http_server.listen(port)    print('Listen on http://localhost:{0}'.format(port))    print('Listen on http://localhost:{0}/page1'.format(port))    print('Listen on http://localhost:{0}/page2'.format(port))    tornado.ioloop.IOLoop.instance().start()

在torndao进行初始化设置时, 在settings 里面指定了自定义模板所在模块.

"ui_modules=my_uimodules"

当tornado在处理模板时,如果碰到如下的语句, 它就会去刚才设置的ui_modules模块中去找 xxxx模板驱动

{% module xxxx %}

页面代码

home.html

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>主页</title></head><body>    {% module HeaderBar("主页") %}    <h1 id="这是主页">这是主页</h1>    <script src="/static/js/home.js"></script></body></html>

page1.html

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>{{ argu1 }}</title></head><body>    {% module HeaderBar("页面1") %}     <h1 id="这是Page">这是Page1</h1>     <ul>       {% for i in argu2 %}         <li>{{ i }}</li>       {% end %}     </ul></body></html>

page2.html

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Page2</title></head><body>    {% module HeaderBar("页面2") %}     <h1 id="这是Page">这是Page2</h1></body></html>

所有页面模板的body的第一行都添加了一个 {% module HeaderBar("页面2") %} ,如前面所讲当tornado在处理render的模板时如果碰到了这种格式的请求,就会去 ui_modules 指定的模块my_uimodules下面查找HeaderBar,并把"页面2"作为第一个参数传给了它, HeaderBar把这个参数当做location传给了 header.html.

就这样每个页面顶部导航栏的相同和不同之处都体现了出来.

代码git地址

http://git.oschina.net/donggen/tornado-test

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