Wang yongshan created VELOCITY-885:
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Summary: 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: 2.1.x
Reporter: Wang yongshan
Priority: Minor
Fix For: 2.1.x
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 {color: #cc0000; 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 {color: #cc0000; 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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