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Posted to dev@velocity.apache.org by "Michael Osipov (JIRA)" <ji...@apache.org> on 2017/11/02 11:34:00 UTC
[jira] [Updated] (VELOCITY-885) 希望 Velocity-tools-layout 能够增加 #block()、#super() 模板指令
[ https://issues.apache.org/jira/browse/VELOCITY-885?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Osipov updated VELOCITY-885:
------------------------------------
Affects Version/s: (was: 2.1.x)
2.0
> 希望 Velocity-tools-layout 能够增加 #block()、#super() 模板指令
> ----------------------------------------------------
>
> Key: VELOCITY-885
> URL: https://issues.apache.org/jira/browse/VELOCITY-885
> Project: Velocity
> Issue Type: New Feature
> Components: Engine
> Affects Versions: 2.0
> Reporter: Wang yongshan
> Priority: Minor
>
> 我在使用 Python 模板引擎 Jinja2(http://jinja.pocoo.org/)时，发现 Jinja2 的 *{% block title %} Default title {% endblock %}* 和 *{{ super() }}* 语法特性在 Layout 继承时非常有用，例如：
> *default-layout.html*
> {code:html}
> <head>
> <title>{% block title %}Default title{% endblock %}</title>
> {% block head %}
> <link rel="stylesheet" href="style.css"/>
> {% endblock %}
> </head>
> <body>
> {% block content %} {% endblock %}
> </body>
> {code}
> *child.html*
> {code:html}
> {% extends "default-layout.html" %}
> {% block title %}User Manager{% endblock %}
> {% block head %}
> {{ super() }}
> <style type="text/css">
> .important {font-size:20px;font-weight:bold;}
> </style>
> {% endblock %}
> {% block content %}
> <h2>User Manager</h2>
> ...
> {% endblock %}
> {code}
> 这种特性在 *局部大块内容进行复用/替换* 时非常有用，能提高 Web 页面的开发效率和减少一定的代码量。
> 因此，我在 Velocity-1.7.x 中进行了修改，增加了： *#block() #end* 、*#override() #end* 和 *#super()* 指令，用法如下：
> *default-layout.html*
> {code:html}
> <head>
> <title>#block("title") Default title #end</title>
> #block("head")
> <link rel="stylesheet" href="style.css"/>
> #end
> </head>
> <body>
> $!{ screen_content }
> </body>
> {code}
> *child.html*
> {code:html}
> #override("title") User Manager #end
> #override("head")
> #super()
> <style type="text/css">
> .important {font-size:20px;font-weight:bold;}
> </style>
> #end
> <h2>User Manager</h2>
> ...
> {code}
> 希望 Velocity-2.x 后面也能够增加类似 Jinja2 的 block、super 等指令。
> 祝愿 Velocity 越来越好！
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