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EventObserver
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摘要： 嵌套 | 字段 | <A HREF="#constructor_summary">构造函数</A> | <A HREF="#method_summary">方法</A></FONT></TD>
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net.conic.prototype</FONT>
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类 EventObserver</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../resources/inherit.gif" ALT="继承者 "><B>net.conic.prototype.EventObserver</B>
</PRE>
<DL>
<DT><B>直接已知子类：</B> <DD><A HREF="../../../net/conic/prototype/FormElementEventObserver.html" title="net.conic.prototype 中的类">FormElementEventObserver</A>, <A HREF="../../../net/conic/prototype/FormEventObserver.html" title="net.conic.prototype 中的类">FormEventObserver</A></DD>
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<DT><PRE>public abstract class <B>EventObserver</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
基于事件机制侦听对象内容变更的抽象类,与TimedObserver的区别在于后者是定时轮循时侦听Value变更并执行回调，前者是事件发生时才执行回调。 <p>注意,在参考资料http://www.sergiopereira.com/articles/prototype.js.html中对EventObserver的描述有误
<P>
<P>
<DL>
<DT><B>版本：</B></DT>
<DD>Prototype Document Version 0.1</DD>
<DT><B>作者：</B></DT>
<DD>Chen (Email:jtjdskq@126.com) <p>主要用于监听一个对象内部内容发生变更时回调指定的方法。如需要自已实现其它方式的侦听可以参考它的子类实现情况。</DD>
<DT><B>另请参见：</B><DD><A HREF="../../../net/conic/prototype/FormElementEventObserver.html" title="net.conic.prototype 中的类"><CODE>FormElementEventObserver</CODE></A>,
<A HREF="../../../net/conic/prototype/FormEventObserver.html" title="net.conic.prototype 中的类"><CODE>FormEventObserver</CODE></A></DL>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<B>构造函数摘要</B></FONT></TH>
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<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/conic/prototype/EventObserver.html#EventObserver(net.conic.prototype.Object, net.conic.prototype.Function)">EventObserver</A></B>(<A HREF="../../../net/conic/prototype/Object.html" title="net.conic.prototype 中的类">Object</A> element,
<A HREF="../../../net/conic/prototype/Function.html" title="net.conic.prototype 中的类">Function</A> callback)</CODE>
<BR>
此初始化构造方法在子类初始化通过调用此方法做初始化</TD>
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<B>方法摘要</B></FONT></TH>
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<CODE>protected abstract <A HREF="../../../net/conic/prototype/Object.html" title="net.conic.prototype 中的类">Object</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/conic/prototype/EventObserver.html#getValue()">getValue</A></B>()</CODE>
<BR>
给子类定义其关注的变更对象的值</TD>
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<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/conic/prototype/EventObserver.html#onElementEvent()">onElementEvent</A></B>()</CODE>
<BR>
事件发生时执行的方法。</TD>
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<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/conic/prototype/EventObserver.html#registerCallback()">registerCallback</A></B>()</CODE>
<BR>
注册相应的Callback方法.</TD>
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<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/conic/prototype/EventObserver.html#registerFormCallbacks()">registerFormCallbacks</A></B>()</CODE>
<BR>
让表单中所有的成员的变更事件都被侦听，并注册指定的Callback方法.</TD>
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<TH ALIGN="left"><B>从类 java.lang.Object 继承的方法</B></TH>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="EventObserver(net.conic.prototype.Object, net.conic.prototype.Function)"><!-- --></A><H3>
EventObserver</H3>
<PRE>
protected <B>EventObserver</B>(<A HREF="../../../net/conic/prototype/Object.html" title="net.conic.prototype 中的类">Object</A> element,
<A HREF="../../../net/conic/prototype/Function.html" title="net.conic.prototype 中的类">Function</A> callback)</PRE>
<DL>
<DD>此初始化构造方法在子类初始化通过调用此方法做初始化
<P>
<DL>
<DT><B>参数：</B><DD><CODE>element</CODE> - 被监听对象的id或者直接是对象的引用。 特别注意的时,如果传入的是一个HTML的Form对象,则表单中任何表单成员发生变更事件都将触发callback方法<DD><CODE>callback</CODE> - 触发时调用方法对象,以function(element,value){}的形式引入</DL>
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<A NAME="registerFormCallbacks()"><!-- --></A><H3>
registerFormCallbacks</H3>
<PRE>
protected void <B>registerFormCallbacks</B>()</PRE>
<DL>
<DD>让表单中所有的成员的变更事件都被侦听，并注册指定的Callback方法. 当传入的element是一个form时才执行此方法<b>内部方法，外部建议不要使用!</b>
<P>
<DD><DL>
</DL>
</DD>
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<A NAME="registerCallback()"><!-- --></A><H3>
registerCallback</H3>
<PRE>
protected void <B>registerCallback</B>()</PRE>
<DL>
<DD>注册相应的Callback方法. <b>内部方法，外部建议不要使用!</b>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="onElementEvent()"><!-- --></A><H3>
onElementEvent</H3>
<PRE>
protected void <B>onElementEvent</B>()</PRE>
<DL>
<DD>事件发生时执行的方法。<b>内部方法，外部建议不要使用!</b> 内部实现主要是根据@see #getValue()返回的值与初始化时@see #getValue()出来的初始值进行比较， 如果值发现变更，则调用引入的callback方法。
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getValue()"><!-- --></A><H3>
getValue</H3>
<PRE>
protected abstract <A HREF="../../../net/conic/prototype/Object.html" title="net.conic.prototype 中的类">Object</A> <B>getValue</B>()</PRE>
<DL>
<DD>给子类定义其关注的变更对象的值
<P>
<DD><DL>
<DT><B>返回：</B><DD>返回关注的对象的值</DL>
</DD>
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